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/module.h>
  24 #include <linux/file.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos.h>
  28 #include <linux/uio.h>
  29 #include <linux/dma-mapping.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/timer.h>
  36 #include <sound/minors.h>
  37 #include <asm/io.h>
  38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  39 #include <dma-coherence.h>
  40 #endif
  41
  42 /*
  43  *  Compatibility
  44  */
  45
  46 struct snd_pcm_hw_params_old {
  47         unsigned int flags;
  48         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  49                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  50         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  51                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  52         unsigned int rmask;
  53         unsigned int cmask;
  54         unsigned int info;
  55         unsigned int msbits;
  56         unsigned int rate_num;
  57         unsigned int rate_den;
  58         snd_pcm_uframes_t fifo_size;
  59         unsigned char reserved[64];
  60 };
  61
  62 #ifdef CONFIG_SND_SUPPORT_OLD_API
  63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  65
  66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  69                                       struct snd_pcm_hw_params_old __user * _oparams);
  70 #endif
  71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  72
  73 /*
  74  *
  75  */
  76
  77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  79
  80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  81
  82 static inline mm_segment_t snd_enter_user(void)
  83 {
  84         mm_segment_t fs = get_fs();
  85         set_fs(get_ds());
  86         return fs;
  87 }
  88
  89 static inline void snd_leave_user(mm_segment_t fs)
  90 {
  91         set_fs(fs);
  92 }
  93
  94
  95
  96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  97 {
  98         struct snd_pcm_runtime *runtime;
  99         struct snd_pcm *pcm = substream->pcm;
 100         struct snd_pcm_str *pstr = substream->pstr;
 101
 102         memset(info, 0, sizeof(*info));
 103         info->card = pcm->card->number;
 104         info->device = pcm->device;
 105         info->stream = substream->stream;
 106         info->subdevice = substream->number;
 107         strlcpy(info->id, pcm->id, sizeof(info->id));
 108         strlcpy(info->name, pcm->name, sizeof(info->name));
 109         info->dev_class = pcm->dev_class;
 110         info->dev_subclass = pcm->dev_subclass;
 111         info->subdevices_count = pstr->substream_count;
 112         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 113         strlcpy(info->subname, substream->name, sizeof(info->subname));
 114         runtime = substream->runtime;
 115         /* AB: FIXME!!! This is definitely nonsense */
 116         if (runtime) {
 117                 info->sync = runtime->sync;
 118                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 119         }
 120         return 0;
 121 }
 122
 123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 124                       struct snd_pcm_info __user * _info)
 125 {
 126         struct snd_pcm_info *info;
 127         int err;
 128
 129         info = kmalloc(sizeof(*info), GFP_KERNEL);
 130         if (! info)
 131                 return -ENOMEM;
 132         err = snd_pcm_info(substream, info);
 133         if (err >= 0) {
 134                 if (copy_to_user(_info, info, sizeof(*info)))
 135                         err = -EFAULT;
 136         }
 137         kfree(info);
 138         return err;
 139 }
 140
 141 #undef RULES_DEBUG
 142
 143 #ifdef RULES_DEBUG
 144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 145 static const char * const snd_pcm_hw_param_names[] = {
 146         HW_PARAM(ACCESS),
 147         HW_PARAM(FORMAT),
 148         HW_PARAM(SUBFORMAT),
 149         HW_PARAM(SAMPLE_BITS),
 150         HW_PARAM(FRAME_BITS),
 151         HW_PARAM(CHANNELS),
 152         HW_PARAM(RATE),
 153         HW_PARAM(PERIOD_TIME),
 154         HW_PARAM(PERIOD_SIZE),
 155         HW_PARAM(PERIOD_BYTES),
 156         HW_PARAM(PERIODS),
 157         HW_PARAM(BUFFER_TIME),
 158         HW_PARAM(BUFFER_SIZE),
 159         HW_PARAM(BUFFER_BYTES),
 160         HW_PARAM(TICK_TIME),
 161 };
 162 #endif
 163
 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 165                       struct snd_pcm_hw_params *params)
 166 {
 167         unsigned int k;
 168         struct snd_pcm_hardware *hw;
 169         struct snd_interval *i = NULL;
 170         struct snd_mask *m = NULL;
 171         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 172         unsigned int rstamps[constrs->rules_num];
 173         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 174         unsigned int stamp = 2;
 175         int changed, again;
 176
 177         params->info = 0;
 178         params->fifo_size = 0;
 179         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 180                 params->msbits = 0;
 181         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 182                 params->rate_num = 0;
 183                 params->rate_den = 0;
 184         }
 185
 186         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 187                 m = hw_param_mask(params, k);
 188                 if (snd_mask_empty(m))
 189                         return -EINVAL;
 190                 if (!(params->rmask & (1 << k)))
 191                         continue;
 192 #ifdef RULES_DEBUG
 193                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 194                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 197 #ifdef RULES_DEBUG
 198                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 199 #endif
 200                 if (changed)
 201                         params->cmask |= 1 << k;
 202                 if (changed < 0)
 203                         return changed;
 204         }
 205
 206         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 207                 i = hw_param_interval(params, k);
 208                 if (snd_interval_empty(i))
 209                         return -EINVAL;
 210                 if (!(params->rmask & (1 << k)))
 211                         continue;
 212 #ifdef RULES_DEBUG
 213                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 214                 if (i->empty)
 215                         printk("empty");
 216                 else
 217                         printk("%c%u %u%c",
 218                                i->openmin ? '(' : '[', i->min,
 219                                i->max, i->openmax ? ')' : ']');
 220                 printk(" -> ");
 221 #endif
 222                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 223 #ifdef RULES_DEBUG
 224                 if (i->empty)
 225                         printk("empty\n");
 226                 else
 227                         printk("%c%u %u%c\n",
 228                                i->openmin ? '(' : '[', i->min,
 229                                i->max, i->openmax ? ')' : ']');
 230 #endif
 231                 if (changed)
 232                         params->cmask |= 1 << k;
 233                 if (changed < 0)
 234                         return changed;
 235         }
 236
 237         for (k = 0; k < constrs->rules_num; k++)
 238                 rstamps[k] = 0;
 239         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 240                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 241         do {
 242                 again = 0;
 243                 for (k = 0; k < constrs->rules_num; k++) {
 244                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 245                         unsigned int d;
 246                         int doit = 0;
 247                         if (r->cond && !(r->cond & params->flags))
 248                                 continue;
 249                         for (d = 0; r->deps[d] >= 0; d++) {
 250                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 251                                         doit = 1;
 252                                         break;
 253                                 }
 254                         }
 255                         if (!doit)
 256                                 continue;
 257 #ifdef RULES_DEBUG
 258                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 259                         if (r->var >= 0) {
 260                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 261                                 if (hw_is_mask(r->var)) {
 262                                         m = hw_param_mask(params, r->var);
 263                                         printk("%x", *m->bits);
 264                                 } else {
 265                                         i = hw_param_interval(params, r->var);
 266                                         if (i->empty)
 267                                                 printk("empty");
 268                                         else
 269                                                 printk("%c%u %u%c",
 270                                                        i->openmin ? '(' : '[', i->min,
 271                                                        i->max, i->openmax ? ')' : ']');
 272                                 }
 273                         }
 274 #endif
 275                         changed = r->func(params, r);
 276 #ifdef RULES_DEBUG
 277                         if (r->var >= 0) {
 278                                 printk(" -> ");
 279                                 if (hw_is_mask(r->var))
 280                                         printk("%x", *m->bits);
 281                                 else {
 282                                         if (i->empty)
 283                                                 printk("empty");
 284                                         else
 285                                                 printk("%c%u %u%c",
 286                                                        i->openmin ? '(' : '[', i->min,
 287                                                        i->max, i->openmax ? ')' : ']');
 288                                 }
 289                         }
 290                         printk("\n");
 291 #endif
 292                         rstamps[k] = stamp;
 293                         if (changed && r->var >= 0) {
 294                                 params->cmask |= (1 << r->var);
 295                                 vstamps[r->var] = stamp;
 296                                 again = 1;
 297                         }
 298                         if (changed < 0)
 299                                 return changed;
 300                         stamp++;
 301                 }
 302         } while (again);
 303         if (!params->msbits) {
 304                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 305                 if (snd_interval_single(i))
 306                         params->msbits = snd_interval_value(i);
 307         }
 308
 309         if (!params->rate_den) {
 310                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 311                 if (snd_interval_single(i)) {
 312                         params->rate_num = snd_interval_value(i);
 313                         params->rate_den = 1;
 314                 }
 315         }
 316
 317         hw = &substream->runtime->hw;
 318         if (!params->info)
 319                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 320         if (!params->fifo_size) {
 321                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 322                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 323                 if (snd_mask_min(m) == snd_mask_max(m) &&
 324                     snd_interval_min(i) == snd_interval_max(i)) {
 325                         changed = substream->ops->ioctl(substream,
 326                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 327                         if (changed < 0)
 328                                 return changed;
 329                 }
 330         }
 331         params->rmask = 0;
 332         return 0;
 333 }
 334
 335 EXPORT_SYMBOL(snd_pcm_hw_refine);
 336
 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 338                                   struct snd_pcm_hw_params __user * _params)
 339 {
 340         struct snd_pcm_hw_params *params;
 341         int err;
 342
 343         params = memdup_user(_params, sizeof(*params));
 344         if (IS_ERR(params))
 345                 return PTR_ERR(params);
 346
 347         err = snd_pcm_hw_refine(substream, params);
 348         if (copy_to_user(_params, params, sizeof(*params))) {
 349                 if (!err)
 350                         err = -EFAULT;
 351         }
 352
 353         kfree(params);
 354         return err;
 355 }
 356
 357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 358 {
 359         int usecs;
 360
 361         if (! runtime->rate)
 362                 return -1; /* invalid */
 363
 364         /* take 75% of period time as the deadline */
 365         usecs = (750000 / runtime->rate) * runtime->period_size;
 366         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 367                 runtime->rate;
 368
 369         return usecs;
 370 }
 371
 372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 373 {
 374         snd_pcm_stream_lock_irq(substream);
 375         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 376                 substream->runtime->status->state = state;
 377         snd_pcm_stream_unlock_irq(substream);
 378 }
 379
 380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 381                              struct snd_pcm_hw_params *params)
 382 {
 383         struct snd_pcm_runtime *runtime;
 384         int err, usecs;
 385         unsigned int bits;
 386         snd_pcm_uframes_t frames;
 387
 388         if (PCM_RUNTIME_CHECK(substream))
 389                 return -ENXIO;
 390         runtime = substream->runtime;
 391         snd_pcm_stream_lock_irq(substream);
 392         switch (runtime->status->state) {
 393         case SNDRV_PCM_STATE_OPEN:
 394         case SNDRV_PCM_STATE_SETUP:
 395         case SNDRV_PCM_STATE_PREPARED:
 396                 break;
 397         default:
 398                 snd_pcm_stream_unlock_irq(substream);
 399                 return -EBADFD;
 400         }
 401         snd_pcm_stream_unlock_irq(substream);
 402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 403         if (!substream->oss.oss)
 404 #endif
 405                 if (atomic_read(&substream->mmap_count))
 406                         return -EBADFD;
 407
 408         params->rmask = ~0U;
 409         err = snd_pcm_hw_refine(substream, params);
 410         if (err < 0)
 411                 goto _error;
 412
 413         err = snd_pcm_hw_params_choose(substream, params);
 414         if (err < 0)
 415                 goto _error;
 416
 417         if (substream->ops->hw_params != NULL) {
 418                 err = substream->ops->hw_params(substream, params);
 419                 if (err < 0)
 420                         goto _error;
 421         }
 422
 423         runtime->access = params_access(params);
 424         runtime->format = params_format(params);
 425         runtime->subformat = params_subformat(params);
 426         runtime->channels = params_channels(params);
 427         runtime->rate = params_rate(params);
 428         runtime->period_size = params_period_size(params);
 429         runtime->periods = params_periods(params);
 430         runtime->buffer_size = params_buffer_size(params);
 431         runtime->info = params->info;
 432         runtime->rate_num = params->rate_num;
 433         runtime->rate_den = params->rate_den;
 434         runtime->no_period_wakeup =
 435                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 436                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 437
 438         bits = snd_pcm_format_physical_width(runtime->format);
 439         runtime->sample_bits = bits;
 440         bits *= runtime->channels;
 441         runtime->frame_bits = bits;
 442         frames = 1;
 443         while (bits % 8 != 0) {
 444                 bits *= 2;
 445                 frames *= 2;
 446         }
 447         runtime->byte_align = bits / 8;
 448         runtime->min_align = frames;
 449
 450         /* Default sw params */
 451         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 452         runtime->period_step = 1;
 453         runtime->control->avail_min = runtime->period_size;
 454         runtime->start_threshold = 1;
 455         runtime->stop_threshold = runtime->buffer_size;
 456         runtime->silence_threshold = 0;
 457         runtime->silence_size = 0;
 458         runtime->boundary = runtime->buffer_size;
 459         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 460                 runtime->boundary *= 2;
 461
 462         snd_pcm_timer_resolution_change(substream);
 463         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 464
 465         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 466                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 467         if ((usecs = period_to_usecs(runtime)) >= 0)
 468                 pm_qos_add_request(&substream->latency_pm_qos_req,
 469                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 470         return 0;
 471  _error:
 472         /* hardware might be unusable from this time,
 473            so we force application to retry to set
 474            the correct hardware parameter settings */
 475         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 476         if (substream->ops->hw_free != NULL)
 477                 substream->ops->hw_free(substream);
 478         return err;
 479 }
 480
 481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 482                                   struct snd_pcm_hw_params __user * _params)
 483 {
 484         struct snd_pcm_hw_params *params;
 485         int err;
 486
 487         params = memdup_user(_params, sizeof(*params));
 488         if (IS_ERR(params))
 489                 return PTR_ERR(params);
 490
 491         err = snd_pcm_hw_params(substream, params);
 492         if (copy_to_user(_params, params, sizeof(*params))) {
 493                 if (!err)
 494                         err = -EFAULT;
 495         }
 496
 497         kfree(params);
 498         return err;
 499 }
 500
 501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 502 {
 503         struct snd_pcm_runtime *runtime;
 504         int result = 0;
 505
 506         if (PCM_RUNTIME_CHECK(substream))
 507                 return -ENXIO;
 508         runtime = substream->runtime;
 509         snd_pcm_stream_lock_irq(substream);
 510         switch (runtime->status->state) {
 511         case SNDRV_PCM_STATE_SETUP:
 512         case SNDRV_PCM_STATE_PREPARED:
 513                 break;
 514         default:
 515                 snd_pcm_stream_unlock_irq(substream);
 516                 return -EBADFD;
 517         }
 518         snd_pcm_stream_unlock_irq(substream);
 519         if (atomic_read(&substream->mmap_count))
 520                 return -EBADFD;
 521         if (substream->ops->hw_free)
 522                 result = substream->ops->hw_free(substream);
 523         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 524         pm_qos_remove_request(&substream->latency_pm_qos_req);
 525         return result;
 526 }
 527
 528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 529                              struct snd_pcm_sw_params *params)
 530 {
 531         struct snd_pcm_runtime *runtime;
 532         int err;
 533
 534         if (PCM_RUNTIME_CHECK(substream))
 535                 return -ENXIO;
 536         runtime = substream->runtime;
 537         snd_pcm_stream_lock_irq(substream);
 538         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 539                 snd_pcm_stream_unlock_irq(substream);
 540                 return -EBADFD;
 541         }
 542         snd_pcm_stream_unlock_irq(substream);
 543
 544         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 545                 return -EINVAL;
 546         if (params->avail_min == 0)
 547                 return -EINVAL;
 548         if (params->silence_size >= runtime->boundary) {
 549                 if (params->silence_threshold != 0)
 550                         return -EINVAL;
 551         } else {
 552                 if (params->silence_size > params->silence_threshold)
 553                         return -EINVAL;
 554                 if (params->silence_threshold > runtime->buffer_size)
 555                         return -EINVAL;
 556         }
 557         err = 0;
 558         snd_pcm_stream_lock_irq(substream);
 559         runtime->tstamp_mode = params->tstamp_mode;
 560         runtime->period_step = params->period_step;
 561         runtime->control->avail_min = params->avail_min;
 562         runtime->start_threshold = params->start_threshold;
 563         runtime->stop_threshold = params->stop_threshold;
 564         runtime->silence_threshold = params->silence_threshold;
 565         runtime->silence_size = params->silence_size;
 566         params->boundary = runtime->boundary;
 567         if (snd_pcm_running(substream)) {
 568                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 569                     runtime->silence_size > 0)
 570                         snd_pcm_playback_silence(substream, ULONG_MAX);
 571                 err = snd_pcm_update_state(substream, runtime);
 572         }
 573         snd_pcm_stream_unlock_irq(substream);
 574         return err;
 575 }
 576
 577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 578                                   struct snd_pcm_sw_params __user * _params)
 579 {
 580         struct snd_pcm_sw_params params;
 581         int err;
 582         if (copy_from_user(&params, _params, sizeof(params)))
 583                 return -EFAULT;
 584         err = snd_pcm_sw_params(substream, &params);
 585         if (copy_to_user(_params, &params, sizeof(params)))
 586                 return -EFAULT;
 587         return err;
 588 }
 589
 590 int snd_pcm_status(struct snd_pcm_substream *substream,
 591                    struct snd_pcm_status *status)
 592 {
 593         struct snd_pcm_runtime *runtime = substream->runtime;
 594
 595         snd_pcm_stream_lock_irq(substream);
 596         status->state = runtime->status->state;
 597         status->suspended_state = runtime->status->suspended_state;
 598         if (status->state == SNDRV_PCM_STATE_OPEN)
 599                 goto _end;
 600         status->trigger_tstamp = runtime->trigger_tstamp;
 601         if (snd_pcm_running(substream)) {
 602                 snd_pcm_update_hw_ptr(substream);
 603                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 604                         status->tstamp = runtime->status->tstamp;
 605                         status->audio_tstamp =
 606                                 runtime->status->audio_tstamp;
 607                         goto _tstamp_end;
 608                 }
 609         }
 610         snd_pcm_gettime(runtime, &status->tstamp);
 611  _tstamp_end:
 612         status->appl_ptr = runtime->control->appl_ptr;
 613         status->hw_ptr = runtime->status->hw_ptr;
 614         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 615                 status->avail = snd_pcm_playback_avail(runtime);
 616                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 617                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 618                         status->delay = runtime->buffer_size - status->avail;
 619                         status->delay += runtime->delay;
 620                 } else
 621                         status->delay = 0;
 622         } else {
 623                 status->avail = snd_pcm_capture_avail(runtime);
 624                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 625                         status->delay = status->avail + runtime->delay;
 626                 else
 627                         status->delay = 0;
 628         }
 629         status->avail_max = runtime->avail_max;
 630         status->overrange = runtime->overrange;
 631         runtime->avail_max = 0;
 632         runtime->overrange = 0;
 633  _end:
 634         snd_pcm_stream_unlock_irq(substream);
 635         return 0;
 636 }
 637
 638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 639                                struct snd_pcm_status __user * _status)
 640 {
 641         struct snd_pcm_status status;
 642         int res;
 643
 644         memset(&status, 0, sizeof(status));
 645         res = snd_pcm_status(substream, &status);
 646         if (res < 0)
 647                 return res;
 648         if (copy_to_user(_status, &status, sizeof(status)))
 649                 return -EFAULT;
 650         return 0;
 651 }
 652
 653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 654                                 struct snd_pcm_channel_info * info)
 655 {
 656         struct snd_pcm_runtime *runtime;
 657         unsigned int channel;
 658
 659         channel = info->channel;
 660         runtime = substream->runtime;
 661         snd_pcm_stream_lock_irq(substream);
 662         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 663                 snd_pcm_stream_unlock_irq(substream);
 664                 return -EBADFD;
 665         }
 666         snd_pcm_stream_unlock_irq(substream);
 667         if (channel >= runtime->channels)
 668                 return -EINVAL;
 669         memset(info, 0, sizeof(*info));
 670         info->channel = channel;
 671         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 672 }
 673
 674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 675                                      struct snd_pcm_channel_info __user * _info)
 676 {
 677         struct snd_pcm_channel_info info;
 678         int res;
 679
 680         if (copy_from_user(&info, _info, sizeof(info)))
 681                 return -EFAULT;
 682         res = snd_pcm_channel_info(substream, &info);
 683         if (res < 0)
 684                 return res;
 685         if (copy_to_user(_info, &info, sizeof(info)))
 686                 return -EFAULT;
 687         return 0;
 688 }
 689
 690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 691 {
 692         struct snd_pcm_runtime *runtime = substream->runtime;
 693         if (runtime->trigger_master == NULL)
 694                 return;
 695         if (runtime->trigger_master == substream) {
 696                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 697         } else {
 698                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 699                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 700         }
 701         runtime->trigger_master = NULL;
 702 }
 703
 704 struct action_ops {
 705         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 706         int (*do_action)(struct snd_pcm_substream *substream, int state);
 707         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 708         void (*post_action)(struct snd_pcm_substream *substream, int state);
 709 };
 710
 711 /*
 712  *  this functions is core for handling of linked stream
 713  *  Note: the stream state might be changed also on failure
 714  *  Note2: call with calling stream lock + link lock
 715  */
 716 static int snd_pcm_action_group(struct action_ops *ops,
 717                                 struct snd_pcm_substream *substream,
 718                                 int state, int do_lock)
 719 {
 720         struct snd_pcm_substream *s = NULL;
 721         struct snd_pcm_substream *s1;
 722         int res = 0;
 723
 724         snd_pcm_group_for_each_entry(s, substream) {
 725                 if (do_lock && s != substream)
 726                         spin_lock_nested(&s->self_group.lock,
 727                                          SINGLE_DEPTH_NESTING);
 728                 res = ops->pre_action(s, state);
 729                 if (res < 0)
 730                         goto _unlock;
 731         }
 732         snd_pcm_group_for_each_entry(s, substream) {
 733                 res = ops->do_action(s, state);
 734                 if (res < 0) {
 735                         if (ops->undo_action) {
 736                                 snd_pcm_group_for_each_entry(s1, substream) {
 737                                         if (s1 == s) /* failed stream */
 738                                                 break;
 739                                         ops->undo_action(s1, state);
 740                                 }
 741                         }
 742                         s = NULL; /* unlock all */
 743                         goto _unlock;
 744                 }
 745         }
 746         snd_pcm_group_for_each_entry(s, substream) {
 747                 ops->post_action(s, state);
 748         }
 749  _unlock:
 750         if (do_lock) {
 751                 /* unlock streams */
 752                 snd_pcm_group_for_each_entry(s1, substream) {
 753                         if (s1 != substream)
 754                                 spin_unlock(&s1->self_group.lock);
 755                         if (s1 == s)    /* end */
 756                                 break;
 757                 }
 758         }
 759         return res;
 760 }
 761
 762 /*
 763  *  Note: call with stream lock
 764  */
 765 static int snd_pcm_action_single(struct action_ops *ops,
 766                                  struct snd_pcm_substream *substream,
 767                                  int state)
 768 {
 769         int res;
 770
 771         res = ops->pre_action(substream, state);
 772         if (res < 0)
 773                 return res;
 774         res = ops->do_action(substream, state);
 775         if (res == 0)
 776                 ops->post_action(substream, state);
 777         else if (ops->undo_action)
 778                 ops->undo_action(substream, state);
 779         return res;
 780 }
 781
 782 /*
 783  *  Note: call with stream lock
 784  */
 785 static int snd_pcm_action(struct action_ops *ops,
 786                           struct snd_pcm_substream *substream,
 787                           int state)
 788 {
 789         int res;
 790
 791         if (snd_pcm_stream_linked(substream)) {
 792                 if (!spin_trylock(&substream->group->lock)) {
 793                         spin_unlock(&substream->self_group.lock);
 794                         spin_lock(&substream->group->lock);
 795                         spin_lock(&substream->self_group.lock);
 796                 }
 797                 res = snd_pcm_action_group(ops, substream, state, 1);
 798                 spin_unlock(&substream->group->lock);
 799         } else {
 800                 res = snd_pcm_action_single(ops, substream, state);
 801         }
 802         return res;
 803 }
 804
 805 /*
 806  *  Note: don't use any locks before
 807  */
 808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 809                                    struct snd_pcm_substream *substream,
 810                                    int state)
 811 {
 812         int res;
 813
 814         read_lock_irq(&snd_pcm_link_rwlock);
 815         if (snd_pcm_stream_linked(substream)) {
 816                 spin_lock(&substream->group->lock);
 817                 spin_lock(&substream->self_group.lock);
 818                 res = snd_pcm_action_group(ops, substream, state, 1);
 819                 spin_unlock(&substream->self_group.lock);
 820                 spin_unlock(&substream->group->lock);
 821         } else {
 822                 spin_lock(&substream->self_group.lock);
 823                 res = snd_pcm_action_single(ops, substream, state);
 824                 spin_unlock(&substream->self_group.lock);
 825         }
 826         read_unlock_irq(&snd_pcm_link_rwlock);
 827         return res;
 828 }
 829
 830 /*
 831  */
 832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 833                                     struct snd_pcm_substream *substream,
 834                                     int state)
 835 {
 836         int res;
 837
 838         down_read(&snd_pcm_link_rwsem);
 839         if (snd_pcm_stream_linked(substream))
 840                 res = snd_pcm_action_group(ops, substream, state, 0);
 841         else
 842                 res = snd_pcm_action_single(ops, substream, state);
 843         up_read(&snd_pcm_link_rwsem);
 844         return res;
 845 }
 846
 847 /*
 848  * start callbacks
 849  */
 850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 851 {
 852         struct snd_pcm_runtime *runtime = substream->runtime;
 853         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 854                 return -EBADFD;
 855         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 856             !snd_pcm_playback_data(substream))
 857                 return -EPIPE;
 858         runtime->trigger_master = substream;
 859         return 0;
 860 }
 861
 862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 863 {
 864         if (substream->runtime->trigger_master != substream)
 865                 return 0;
 866         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 867 }
 868
 869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 870 {
 871         if (substream->runtime->trigger_master == substream)
 872                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 873 }
 874
 875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 876 {
 877         struct snd_pcm_runtime *runtime = substream->runtime;
 878         snd_pcm_trigger_tstamp(substream);
 879         runtime->hw_ptr_jiffies = jiffies;
 880         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 881                                                             runtime->rate;
 882         runtime->status->state = state;
 883         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 884             runtime->silence_size > 0)
 885                 snd_pcm_playback_silence(substream, ULONG_MAX);
 886         if (substream->timer)
 887                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 888                                  &runtime->trigger_tstamp);
 889 }
 890
 891 static struct action_ops snd_pcm_action_start = {
 892         .pre_action = snd_pcm_pre_start,
 893         .do_action = snd_pcm_do_start,
 894         .undo_action = snd_pcm_undo_start,
 895         .post_action = snd_pcm_post_start
 896 };
 897
 898 /**
 899  * snd_pcm_start - start all linked streams
 900  * @substream: the PCM substream instance
 901  */
 902 int snd_pcm_start(struct snd_pcm_substream *substream)
 903 {
 904         return snd_pcm_action(&snd_pcm_action_start, substream,
 905                               SNDRV_PCM_STATE_RUNNING);
 906 }
 907
 908 /*
 909  * stop callbacks
 910  */
 911 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 912 {
 913         struct snd_pcm_runtime *runtime = substream->runtime;
 914         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 915                 return -EBADFD;
 916         runtime->trigger_master = substream;
 917         return 0;
 918 }
 919
 920 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 921 {
 922         if (substream->runtime->trigger_master == substream &&
 923             snd_pcm_running(substream))
 924                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 925         return 0; /* unconditonally stop all substreams */
 926 }
 927
 928 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 929 {
 930         struct snd_pcm_runtime *runtime = substream->runtime;
 931         if (runtime->status->state != state) {
 932                 snd_pcm_trigger_tstamp(substream);
 933                 if (substream->timer)
 934                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 935                                          &runtime->trigger_tstamp);
 936                 runtime->status->state = state;
 937         }
 938         wake_up(&runtime->sleep);
 939         wake_up(&runtime->tsleep);
 940 }
 941
 942 static struct action_ops snd_pcm_action_stop = {
 943         .pre_action = snd_pcm_pre_stop,
 944         .do_action = snd_pcm_do_stop,
 945         .post_action = snd_pcm_post_stop
 946 };
 947
 948 /**
 949  * snd_pcm_stop - try to stop all running streams in the substream group
 950  * @substream: the PCM substream instance
 951  * @state: PCM state after stopping the stream
 952  *
 953  * The state of each stream is then changed to the given state unconditionally.
 954  */
 955 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
 956 {
 957         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 958 }
 959
 960 EXPORT_SYMBOL(snd_pcm_stop);
 961
 962 /**
 963  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 964  * @substream: the PCM substream
 965  *
 966  * After stopping, the state is changed to SETUP.
 967  * Unlike snd_pcm_stop(), this affects only the given stream.
 968  */
 969 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 970 {
 971         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 972                                      SNDRV_PCM_STATE_SETUP);
 973 }
 974
 975 /*
 976  * pause callbacks
 977  */
 978 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 979 {
 980         struct snd_pcm_runtime *runtime = substream->runtime;
 981         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 982                 return -ENOSYS;
 983         if (push) {
 984                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 985                         return -EBADFD;
 986         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 987                 return -EBADFD;
 988         runtime->trigger_master = substream;
 989         return 0;
 990 }
 991
 992 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 993 {
 994         if (substream->runtime->trigger_master != substream)
 995                 return 0;
 996         /* some drivers might use hw_ptr to recover from the pause -
 997            update the hw_ptr now */
 998         if (push)
 999                 snd_pcm_update_hw_ptr(substream);
1000         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1001          * a delta between the current jiffies, this gives a large enough
1002          * delta, effectively to skip the check once.
1003          */
1004         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1005         return substream->ops->trigger(substream,
1006                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1007                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1008 }
1009
1010 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1011 {
1012         if (substream->runtime->trigger_master == substream)
1013                 substream->ops->trigger(substream,
1014                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1015                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1016 }
1017
1018 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1019 {
1020         struct snd_pcm_runtime *runtime = substream->runtime;
1021         snd_pcm_trigger_tstamp(substream);
1022         if (push) {
1023                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1024                 if (substream->timer)
1025                         snd_timer_notify(substream->timer,
1026                                          SNDRV_TIMER_EVENT_MPAUSE,
1027                                          &runtime->trigger_tstamp);
1028                 wake_up(&runtime->sleep);
1029                 wake_up(&runtime->tsleep);
1030         } else {
1031                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1032                 if (substream->timer)
1033                         snd_timer_notify(substream->timer,
1034                                          SNDRV_TIMER_EVENT_MCONTINUE,
1035                                          &runtime->trigger_tstamp);
1036         }
1037 }
1038
1039 static struct action_ops snd_pcm_action_pause = {
1040         .pre_action = snd_pcm_pre_pause,
1041         .do_action = snd_pcm_do_pause,
1042         .undo_action = snd_pcm_undo_pause,
1043         .post_action = snd_pcm_post_pause
1044 };
1045
1046 /*
1047  * Push/release the pause for all linked streams.
1048  */
1049 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1050 {
1051         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1052 }
1053
1054 #ifdef CONFIG_PM
1055 /* suspend */
1056
1057 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1058 {
1059         struct snd_pcm_runtime *runtime = substream->runtime;
1060         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1061                 return -EBUSY;
1062         runtime->trigger_master = substream;
1063         return 0;
1064 }
1065
1066 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1067 {
1068         struct snd_pcm_runtime *runtime = substream->runtime;
1069         if (runtime->trigger_master != substream)
1070                 return 0;
1071         if (! snd_pcm_running(substream))
1072                 return 0;
1073         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1074         return 0; /* suspend unconditionally */
1075 }
1076
1077 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1078 {
1079         struct snd_pcm_runtime *runtime = substream->runtime;
1080         snd_pcm_trigger_tstamp(substream);
1081         if (substream->timer)
1082                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1083                                  &runtime->trigger_tstamp);
1084         runtime->status->suspended_state = runtime->status->state;
1085         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1086         wake_up(&runtime->sleep);
1087         wake_up(&runtime->tsleep);
1088 }
1089
1090 static struct action_ops snd_pcm_action_suspend = {
1091         .pre_action = snd_pcm_pre_suspend,
1092         .do_action = snd_pcm_do_suspend,
1093         .post_action = snd_pcm_post_suspend
1094 };
1095
1096 /**
1097  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1098  * @substream: the PCM substream
1099  *
1100  * After this call, all streams are changed to SUSPENDED state.
1101  */
1102 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1103 {
1104         int err;
1105         unsigned long flags;
1106
1107         if (! substream)
1108                 return 0;
1109
1110         snd_pcm_stream_lock_irqsave(substream, flags);
1111         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1112         snd_pcm_stream_unlock_irqrestore(substream, flags);
1113         return err;
1114 }
1115
1116 EXPORT_SYMBOL(snd_pcm_suspend);
1117
1118 /**
1119  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1120  * @pcm: the PCM instance
1121  *
1122  * After this call, all streams are changed to SUSPENDED state.
1123  */
1124 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1125 {
1126         struct snd_pcm_substream *substream;
1127         int stream, err = 0;
1128
1129         if (! pcm)
1130                 return 0;
1131
1132         for (stream = 0; stream < 2; stream++) {
1133                 for (substream = pcm->streams[stream].substream;
1134                      substream; substream = substream->next) {
1135                         /* FIXME: the open/close code should lock this as well */
1136                         if (substream->runtime == NULL)
1137                                 continue;
1138                         err = snd_pcm_suspend(substream);
1139                         if (err < 0 && err != -EBUSY)
1140                                 return err;
1141                 }
1142         }
1143         return 0;
1144 }
1145
1146 EXPORT_SYMBOL(snd_pcm_suspend_all);
1147
1148 /* resume */
1149
1150 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1151 {
1152         struct snd_pcm_runtime *runtime = substream->runtime;
1153         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1154                 return -ENOSYS;
1155         runtime->trigger_master = substream;
1156         return 0;
1157 }
1158
1159 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1160 {
1161         struct snd_pcm_runtime *runtime = substream->runtime;
1162         if (runtime->trigger_master != substream)
1163                 return 0;
1164         /* DMA not running previously? */
1165         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1166             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1167              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1168                 return 0;
1169         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1170 }
1171
1172 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1173 {
1174         if (substream->runtime->trigger_master == substream &&
1175             snd_pcm_running(substream))
1176                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1177 }
1178
1179 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1180 {
1181         struct snd_pcm_runtime *runtime = substream->runtime;
1182         snd_pcm_trigger_tstamp(substream);
1183         if (substream->timer)
1184                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1185                                  &runtime->trigger_tstamp);
1186         runtime->status->state = runtime->status->suspended_state;
1187 }
1188
1189 static struct action_ops snd_pcm_action_resume = {
1190         .pre_action = snd_pcm_pre_resume,
1191         .do_action = snd_pcm_do_resume,
1192         .undo_action = snd_pcm_undo_resume,
1193         .post_action = snd_pcm_post_resume
1194 };
1195
1196 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1197 {
1198         struct snd_card *card = substream->pcm->card;
1199         int res;
1200
1201         snd_power_lock(card);
1202         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1203                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1204         snd_power_unlock(card);
1205         return res;
1206 }
1207
1208 #else
1209
1210 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1211 {
1212         return -ENOSYS;
1213 }
1214
1215 #endif /* CONFIG_PM */
1216
1217 /*
1218  * xrun ioctl
1219  *
1220  * Change the RUNNING stream(s) to XRUN state.
1221  */
1222 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1223 {
1224         struct snd_card *card = substream->pcm->card;
1225         struct snd_pcm_runtime *runtime = substream->runtime;
1226         int result;
1227
1228         snd_power_lock(card);
1229         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1230                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1231                 if (result < 0)
1232                         goto _unlock;
1233         }
1234
1235         snd_pcm_stream_lock_irq(substream);
1236         switch (runtime->status->state) {
1237         case SNDRV_PCM_STATE_XRUN:
1238                 result = 0;     /* already there */
1239                 break;
1240         case SNDRV_PCM_STATE_RUNNING:
1241                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1242                 break;
1243         default:
1244                 result = -EBADFD;
1245         }
1246         snd_pcm_stream_unlock_irq(substream);
1247  _unlock:
1248         snd_power_unlock(card);
1249         return result;
1250 }
1251
1252 /*
1253  * reset ioctl
1254  */
1255 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1256 {
1257         struct snd_pcm_runtime *runtime = substream->runtime;
1258         switch (runtime->status->state) {
1259         case SNDRV_PCM_STATE_RUNNING:
1260         case SNDRV_PCM_STATE_PREPARED:
1261         case SNDRV_PCM_STATE_PAUSED:
1262         case SNDRV_PCM_STATE_SUSPENDED:
1263                 return 0;
1264         default:
1265                 return -EBADFD;
1266         }
1267 }
1268
1269 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1270 {
1271         struct snd_pcm_runtime *runtime = substream->runtime;
1272         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1273         if (err < 0)
1274                 return err;
1275         runtime->hw_ptr_base = 0;
1276         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1277                 runtime->status->hw_ptr % runtime->period_size;
1278         runtime->silence_start = runtime->status->hw_ptr;
1279         runtime->silence_filled = 0;
1280         return 0;
1281 }
1282
1283 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1284 {
1285         struct snd_pcm_runtime *runtime = substream->runtime;
1286         runtime->control->appl_ptr = runtime->status->hw_ptr;
1287         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1288             runtime->silence_size > 0)
1289                 snd_pcm_playback_silence(substream, ULONG_MAX);
1290 }
1291
1292 static struct action_ops snd_pcm_action_reset = {
1293         .pre_action = snd_pcm_pre_reset,
1294         .do_action = snd_pcm_do_reset,
1295         .post_action = snd_pcm_post_reset
1296 };
1297
1298 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1299 {
1300         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1301 }
1302
1303 /*
1304  * prepare ioctl
1305  */
1306 /* we use the second argument for updating f_flags */
1307 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1308                                int f_flags)
1309 {
1310         struct snd_pcm_runtime *runtime = substream->runtime;
1311         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1312             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1313                 return -EBADFD;
1314         if (snd_pcm_running(substream))
1315                 return -EBUSY;
1316         substream->f_flags = f_flags;
1317         return 0;
1318 }
1319
1320 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1321 {
1322         int err;
1323         err = substream->ops->prepare(substream);
1324         if (err < 0)
1325                 return err;
1326         return snd_pcm_do_reset(substream, 0);
1327 }
1328
1329 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1330 {
1331         struct snd_pcm_runtime *runtime = substream->runtime;
1332         runtime->control->appl_ptr = runtime->status->hw_ptr;
1333         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1334 }
1335
1336 static struct action_ops snd_pcm_action_prepare = {
1337         .pre_action = snd_pcm_pre_prepare,
1338         .do_action = snd_pcm_do_prepare,
1339         .post_action = snd_pcm_post_prepare
1340 };
1341
1342 /**
1343  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1344  * @substream: the PCM substream instance
1345  * @file: file to refer f_flags
1346  */
1347 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1348                            struct file *file)
1349 {
1350         int res;
1351         struct snd_card *card = substream->pcm->card;
1352         int f_flags;
1353
1354         if (file)
1355                 f_flags = file->f_flags;
1356         else
1357                 f_flags = substream->f_flags;
1358
1359         snd_power_lock(card);
1360         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1361                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1362                                                substream, f_flags);
1363         snd_power_unlock(card);
1364         return res;
1365 }
1366
1367 /*
1368  * drain ioctl
1369  */
1370
1371 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1372 {
1373         struct snd_pcm_runtime *runtime = substream->runtime;
1374         switch (runtime->status->state) {
1375         case SNDRV_PCM_STATE_OPEN:
1376         case SNDRV_PCM_STATE_DISCONNECTED:
1377         case SNDRV_PCM_STATE_SUSPENDED:
1378                 return -EBADFD;
1379         }
1380         runtime->trigger_master = substream;
1381         return 0;
1382 }
1383
1384 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386         struct snd_pcm_runtime *runtime = substream->runtime;
1387         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1388                 switch (runtime->status->state) {
1389                 case SNDRV_PCM_STATE_PREPARED:
1390                         /* start playback stream if possible */
1391                         if (! snd_pcm_playback_empty(substream)) {
1392                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1393                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1394                         }
1395                         break;
1396                 case SNDRV_PCM_STATE_RUNNING:
1397                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1398                         break;
1399                 case SNDRV_PCM_STATE_XRUN:
1400                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1401                         break;
1402                 default:
1403                         break;
1404                 }
1405         } else {
1406                 /* stop running stream */
1407                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1408                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1409                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1410                         snd_pcm_do_stop(substream, new_state);
1411                         snd_pcm_post_stop(substream, new_state);
1412                 }
1413         }
1414         return 0;
1415 }
1416
1417 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1418 {
1419 }
1420
1421 static struct action_ops snd_pcm_action_drain_init = {
1422         .pre_action = snd_pcm_pre_drain_init,
1423         .do_action = snd_pcm_do_drain_init,
1424         .post_action = snd_pcm_post_drain_init
1425 };
1426
1427 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1428
1429 /*
1430  * Drain the stream(s).
1431  * When the substream is linked, sync until the draining of all playback streams
1432  * is finished.
1433  * After this call, all streams are supposed to be either SETUP or DRAINING
1434  * (capture only) state.
1435  */
1436 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1437                          struct file *file)
1438 {
1439         struct snd_card *card;
1440         struct snd_pcm_runtime *runtime;
1441         struct snd_pcm_substream *s;
1442         wait_queue_t wait;
1443         int result = 0;
1444         int nonblock = 0;
1445
1446         card = substream->pcm->card;
1447         runtime = substream->runtime;
1448
1449         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1450                 return -EBADFD;
1451
1452         snd_power_lock(card);
1453         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1454                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1455                 if (result < 0) {
1456                         snd_power_unlock(card);
1457                         return result;
1458                 }
1459         }
1460
1461         if (file) {
1462                 if (file->f_flags & O_NONBLOCK)
1463                         nonblock = 1;
1464         } else if (substream->f_flags & O_NONBLOCK)
1465                 nonblock = 1;
1466
1467         down_read(&snd_pcm_link_rwsem);
1468         snd_pcm_stream_lock_irq(substream);
1469         /* resume pause */
1470         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1471                 snd_pcm_pause(substream, 0);
1472
1473         /* pre-start/stop - all running streams are changed to DRAINING state */
1474         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1475         if (result < 0)
1476                 goto unlock;
1477         /* in non-blocking, we don't wait in ioctl but let caller poll */
1478         if (nonblock) {
1479                 result = -EAGAIN;
1480                 goto unlock;
1481         }
1482
1483         for (;;) {
1484                 long tout;
1485                 struct snd_pcm_runtime *to_check;
1486                 if (signal_pending(current)) {
1487                         result = -ERESTARTSYS;
1488                         break;
1489                 }
1490                 /* find a substream to drain */
1491                 to_check = NULL;
1492                 snd_pcm_group_for_each_entry(s, substream) {
1493                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1494                                 continue;
1495                         runtime = s->runtime;
1496                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1497                                 to_check = runtime;
1498                                 break;
1499                         }
1500                 }
1501                 if (!to_check)
1502                         break; /* all drained */
1503                 init_waitqueue_entry(&wait, current);
1504                 add_wait_queue(&to_check->sleep, &wait);
1505                 snd_pcm_stream_unlock_irq(substream);
1506                 up_read(&snd_pcm_link_rwsem);
1507                 snd_power_unlock(card);
1508                 if (runtime->no_period_wakeup)
1509                         tout = MAX_SCHEDULE_TIMEOUT;
1510                 else {
1511                         tout = 10;
1512                         if (runtime->rate) {
1513                                 long t = runtime->period_size * 2 / runtime->rate;
1514                                 tout = max(t, tout);
1515                         }
1516                         tout = msecs_to_jiffies(tout * 1000);
1517                 }
1518                 tout = schedule_timeout_interruptible(tout);
1519                 snd_power_lock(card);
1520                 down_read(&snd_pcm_link_rwsem);
1521                 snd_pcm_stream_lock_irq(substream);
1522                 remove_wait_queue(&to_check->sleep, &wait);
1523                 if (card->shutdown) {
1524                         result = -ENODEV;
1525                         break;
1526                 }
1527                 if (tout == 0) {
1528                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1529                                 result = -ESTRPIPE;
1530                         else {
1531                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1532                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1533                                 result = -EIO;
1534                         }
1535                         break;
1536                 }
1537         }
1538
1539  unlock:
1540         snd_pcm_stream_unlock_irq(substream);
1541         up_read(&snd_pcm_link_rwsem);
1542         snd_power_unlock(card);
1543
1544         return result;
1545 }
1546
1547 /*
1548  * drop ioctl
1549  *
1550  * Immediately put all linked substreams into SETUP state.
1551  */
1552 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1553 {
1554         struct snd_pcm_runtime *runtime;
1555         int result = 0;
1556
1557         if (PCM_RUNTIME_CHECK(substream))
1558                 return -ENXIO;
1559         runtime = substream->runtime;
1560
1561         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1562             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1563             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1564                 return -EBADFD;
1565
1566         snd_pcm_stream_lock_irq(substream);
1567         /* resume pause */
1568         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1569                 snd_pcm_pause(substream, 0);
1570
1571         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1572         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1573         snd_pcm_stream_unlock_irq(substream);
1574
1575         return result;
1576 }
1577
1578
1579 /* WARNING: Don't forget to fput back the file */
1580 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1581 {
1582         struct file *file;
1583         struct inode *inode;
1584         unsigned int minor;
1585
1586         file = fget_light(fd, fput_needed);
1587         if (!file)
1588                 return NULL;
1589         inode = file->f_path.dentry->d_inode;
1590         if (!S_ISCHR(inode->i_mode) ||
1591             imajor(inode) != snd_major) {
1592                 fput_light(file, *fput_needed);
1593                 return NULL;
1594         }
1595         minor = iminor(inode);
1596         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1597             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1598                 fput_light(file, *fput_needed);
1599                 return NULL;
1600         }
1601         return file;
1602 }
1603
1604 /*
1605  * PCM link handling
1606  */
1607 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1608 {
1609         int res = 0;
1610         struct file *file;
1611         struct snd_pcm_file *pcm_file;
1612         struct snd_pcm_substream *substream1;
1613         struct snd_pcm_group *group;
1614         int fput_needed;
1615
1616         file = snd_pcm_file_fd(fd, &fput_needed);
1617         if (!file)
1618                 return -EBADFD;
1619         pcm_file = file->private_data;
1620         substream1 = pcm_file->substream;
1621         group = kmalloc(sizeof(*group), GFP_KERNEL);
1622         if (!group) {
1623                 res = -ENOMEM;
1624                 goto _nolock;
1625         }
1626         down_write(&snd_pcm_link_rwsem);
1627         write_lock_irq(&snd_pcm_link_rwlock);
1628         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1629             substream->runtime->status->state != substream1->runtime->status->state) {
1630                 res = -EBADFD;
1631                 goto _end;
1632         }
1633         if (snd_pcm_stream_linked(substream1)) {
1634                 res = -EALREADY;
1635                 goto _end;
1636         }
1637         if (!snd_pcm_stream_linked(substream)) {
1638                 substream->group = group;
1639                 spin_lock_init(&substream->group->lock);
1640                 INIT_LIST_HEAD(&substream->group->substreams);
1641                 list_add_tail(&substream->link_list, &substream->group->substreams);
1642                 substream->group->count = 1;
1643         }
1644         list_add_tail(&substream1->link_list, &substream->group->substreams);
1645         substream->group->count++;
1646         substream1->group = substream->group;
1647  _end:
1648         write_unlock_irq(&snd_pcm_link_rwlock);
1649         up_write(&snd_pcm_link_rwsem);
1650  _nolock:
1651         snd_card_unref(substream1->pcm->card);
1652         fput_light(file, fput_needed);
1653         if (res < 0)
1654                 kfree(group);
1655         return res;
1656 }
1657
1658 static void relink_to_local(struct snd_pcm_substream *substream)
1659 {
1660         substream->group = &substream->self_group;
1661         INIT_LIST_HEAD(&substream->self_group.substreams);
1662         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1663 }
1664
1665 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1666 {
1667         struct snd_pcm_substream *s;
1668         int res = 0;
1669
1670         down_write(&snd_pcm_link_rwsem);
1671         write_lock_irq(&snd_pcm_link_rwlock);
1672         if (!snd_pcm_stream_linked(substream)) {
1673                 res = -EALREADY;
1674                 goto _end;
1675         }
1676         list_del(&substream->link_list);
1677         substream->group->count--;
1678         if (substream->group->count == 1) {     /* detach the last stream, too */
1679                 snd_pcm_group_for_each_entry(s, substream) {
1680                         relink_to_local(s);
1681                         break;
1682                 }
1683                 kfree(substream->group);
1684         }
1685         relink_to_local(substream);
1686        _end:
1687         write_unlock_irq(&snd_pcm_link_rwlock);
1688         up_write(&snd_pcm_link_rwsem);
1689         return res;
1690 }
1691
1692 /*
1693  * hw configurator
1694  */
1695 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1696                                struct snd_pcm_hw_rule *rule)
1697 {
1698         struct snd_interval t;
1699         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1700                      hw_param_interval_c(params, rule->deps[1]), &t);
1701         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1702 }
1703
1704 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1705                                struct snd_pcm_hw_rule *rule)
1706 {
1707         struct snd_interval t;
1708         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1709                      hw_param_interval_c(params, rule->deps[1]), &t);
1710         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1711 }
1712
1713 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1714                                    struct snd_pcm_hw_rule *rule)
1715 {
1716         struct snd_interval t;
1717         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1718                          hw_param_interval_c(params, rule->deps[1]),
1719                          (unsigned long) rule->private, &t);
1720         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1721 }
1722
1723 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1724                                    struct snd_pcm_hw_rule *rule)
1725 {
1726         struct snd_interval t;
1727         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1728                          (unsigned long) rule->private,
1729                          hw_param_interval_c(params, rule->deps[1]), &t);
1730         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1731 }
1732
1733 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1734                                   struct snd_pcm_hw_rule *rule)
1735 {
1736         unsigned int k;
1737         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1738         struct snd_mask m;
1739         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1740         snd_mask_any(&m);
1741         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1742                 int bits;
1743                 if (! snd_mask_test(mask, k))
1744                         continue;
1745                 bits = snd_pcm_format_physical_width(k);
1746                 if (bits <= 0)
1747                         continue; /* ignore invalid formats */
1748                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1749                         snd_mask_reset(&m, k);
1750         }
1751         return snd_mask_refine(mask, &m);
1752 }
1753
1754 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1755                                        struct snd_pcm_hw_rule *rule)
1756 {
1757         struct snd_interval t;
1758         unsigned int k;
1759         t.min = UINT_MAX;
1760         t.max = 0;
1761         t.openmin = 0;
1762         t.openmax = 0;
1763         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1764                 int bits;
1765                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1766                         continue;
1767                 bits = snd_pcm_format_physical_width(k);
1768                 if (bits <= 0)
1769                         continue; /* ignore invalid formats */
1770                 if (t.min > (unsigned)bits)
1771                         t.min = bits;
1772                 if (t.max < (unsigned)bits)
1773                         t.max = bits;
1774         }
1775         t.integer = 1;
1776         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1777 }
1778
1779 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1780 #error "Change this table"
1781 #endif
1782
1783 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1784                                  48000, 64000, 88200, 96000, 176400, 192000 };
1785
1786 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1787         .count = ARRAY_SIZE(rates),
1788         .list = rates,
1789 };
1790
1791 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1792                                 struct snd_pcm_hw_rule *rule)
1793 {
1794         struct snd_pcm_hardware *hw = rule->private;
1795         return snd_interval_list(hw_param_interval(params, rule->var),
1796                                  snd_pcm_known_rates.count,
1797                                  snd_pcm_known_rates.list, hw->rates);
1798 }
1799
1800 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1801                                             struct snd_pcm_hw_rule *rule)
1802 {
1803         struct snd_interval t;
1804         struct snd_pcm_substream *substream = rule->private;
1805         t.min = 0;
1806         t.max = substream->buffer_bytes_max;
1807         t.openmin = 0;
1808         t.openmax = 0;
1809         t.integer = 1;
1810         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1811 }
1812
1813 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1814 {
1815         struct snd_pcm_runtime *runtime = substream->runtime;
1816         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1817         int k, err;
1818
1819         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1820                 snd_mask_any(constrs_mask(constrs, k));
1821         }
1822
1823         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1824                 snd_interval_any(constrs_interval(constrs, k));
1825         }
1826
1827         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1828         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1829         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1830         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1831         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1832
1833         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1834                                    snd_pcm_hw_rule_format, NULL,
1835                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1836         if (err < 0)
1837                 return err;
1838         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1839                                   snd_pcm_hw_rule_sample_bits, NULL,
1840                                   SNDRV_PCM_HW_PARAM_FORMAT,
1841                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1842         if (err < 0)
1843                 return err;
1844         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1845                                   snd_pcm_hw_rule_div, NULL,
1846                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1847         if (err < 0)
1848                 return err;
1849         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1850                                   snd_pcm_hw_rule_mul, NULL,
1851                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1852         if (err < 0)
1853                 return err;
1854         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1855                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1856                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1857         if (err < 0)
1858                 return err;
1859         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1860                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1861                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1862         if (err < 0)
1863                 return err;
1864         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1865                                   snd_pcm_hw_rule_div, NULL,
1866                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1867         if (err < 0)
1868                 return err;
1869         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1870                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1871                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1872         if (err < 0)
1873                 return err;
1874         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1875                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1876                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1877         if (err < 0)
1878                 return err;
1879         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1880                                   snd_pcm_hw_rule_div, NULL,
1881                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1882         if (err < 0)
1883                 return err;
1884         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1885                                   snd_pcm_hw_rule_div, NULL,
1886                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1887         if (err < 0)
1888                 return err;
1889         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1890                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1891                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1892         if (err < 0)
1893                 return err;
1894         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1895                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1896                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1897         if (err < 0)
1898                 return err;
1899         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1900                                   snd_pcm_hw_rule_mul, NULL,
1901                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1902         if (err < 0)
1903                 return err;
1904         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1905                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1906                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1907         if (err < 0)
1908                 return err;
1909         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1910                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1911                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1912         if (err < 0)
1913                 return err;
1914         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1915                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1916                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1917         if (err < 0)
1918                 return err;
1919         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1920                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1921                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1922         if (err < 0)
1923                 return err;
1924         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1925                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1926                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1927         if (err < 0)
1928                 return err;
1929         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1930                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1931                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1932         if (err < 0)
1933                 return err;
1934         return 0;
1935 }
1936
1937 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1938 {
1939         struct snd_pcm_runtime *runtime = substream->runtime;
1940         struct snd_pcm_hardware *hw = &runtime->hw;
1941         int err;
1942         unsigned int mask = 0;
1943
1944         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1945                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1946         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1947                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1948         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1949                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1950                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1951                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1952                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1953                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1954                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1955         }
1956         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1957         if (err < 0)
1958                 return err;
1959
1960         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1961         if (err < 0)
1962                 return err;
1963
1964         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1965         if (err < 0)
1966                 return err;
1967
1968         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1969                                            hw->channels_min, hw->channels_max);
1970         if (err < 0)
1971                 return err;
1972
1973         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1974                                            hw->rate_min, hw->rate_max);
1975         if (err < 0)
1976                 return err;
1977
1978         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1979                                            hw->period_bytes_min, hw->period_bytes_max);
1980         if (err < 0)
1981                 return err;
1982
1983         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1984                                            hw->periods_min, hw->periods_max);
1985         if (err < 0)
1986                 return err;
1987
1988         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1989                                            hw->period_bytes_min, hw->buffer_bytes_max);
1990         if (err < 0)
1991                 return err;
1992
1993         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1994                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1995                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1996         if (err < 0)
1997                 return err;
1998
1999         /* FIXME: remove */
2000         if (runtime->dma_bytes) {
2001                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2002                 if (err < 0)
2003                         return err;
2004         }
2005
2006         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2007                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2008                                           snd_pcm_hw_rule_rate, hw,
2009                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2010                 if (err < 0)
2011                         return err;
2012         }
2013
2014         /* FIXME: this belong to lowlevel */
2015         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2016
2017         return 0;
2018 }
2019
2020 static void pcm_release_private(struct snd_pcm_substream *substream)
2021 {
2022         snd_pcm_unlink(substream);
2023 }
2024
2025 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2026 {
2027         substream->ref_count--;
2028         if (substream->ref_count > 0)
2029                 return;
2030
2031         snd_pcm_drop(substream);
2032         if (substream->hw_opened) {
2033                 if (substream->ops->hw_free != NULL)
2034                         substream->ops->hw_free(substream);
2035                 substream->ops->close(substream);
2036                 substream->hw_opened = 0;
2037         }
2038         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2039                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2040         if (substream->pcm_release) {
2041                 substream->pcm_release(substream);
2042                 substream->pcm_release = NULL;
2043         }
2044         snd_pcm_detach_substream(substream);
2045 }
2046
2047 EXPORT_SYMBOL(snd_pcm_release_substream);
2048
2049 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2050                            struct file *file,
2051                            struct snd_pcm_substream **rsubstream)
2052 {
2053         struct snd_pcm_substream *substream;
2054         int err;
2055
2056         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2057         if (err < 0)
2058                 return err;
2059         if (substream->ref_count > 1) {
2060                 *rsubstream = substream;
2061                 return 0;
2062         }
2063
2064         err = snd_pcm_hw_constraints_init(substream);
2065         if (err < 0) {
2066                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2067                 goto error;
2068         }
2069
2070         if ((err = substream->ops->open(substream)) < 0)
2071                 goto error;
2072
2073         substream->hw_opened = 1;
2074
2075         err = snd_pcm_hw_constraints_complete(substream);
2076         if (err < 0) {
2077                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2078                 goto error;
2079         }
2080
2081         *rsubstream = substream;
2082         return 0;
2083
2084  error:
2085         snd_pcm_release_substream(substream);
2086         return err;
2087 }
2088
2089 EXPORT_SYMBOL(snd_pcm_open_substream);
2090
2091 static int snd_pcm_open_file(struct file *file,
2092                              struct snd_pcm *pcm,
2093                              int stream)
2094 {
2095         struct snd_pcm_file *pcm_file;
2096         struct snd_pcm_substream *substream;
2097         int err;
2098
2099         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2100         if (err < 0)
2101                 return err;
2102
2103         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2104         if (pcm_file == NULL) {
2105                 snd_pcm_release_substream(substream);
2106                 return -ENOMEM;
2107         }
2108         pcm_file->substream = substream;
2109         if (substream->ref_count == 1) {
2110                 substream->file = pcm_file;
2111                 substream->pcm_release = pcm_release_private;
2112         }
2113         file->private_data = pcm_file;
2114
2115         return 0;
2116 }
2117
2118 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2119 {
2120         struct snd_pcm *pcm;
2121         int err = nonseekable_open(inode, file);
2122         if (err < 0)
2123                 return err;
2124         pcm = snd_lookup_minor_data(iminor(inode),
2125                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2126         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2127         if (pcm)
2128                 snd_card_unref(pcm->card);
2129         return err;
2130 }
2131
2132 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2133 {
2134         struct snd_pcm *pcm;
2135         int err = nonseekable_open(inode, file);
2136         if (err < 0)
2137                 return err;
2138         pcm = snd_lookup_minor_data(iminor(inode),
2139                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2140         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2141         if (pcm)
2142                 snd_card_unref(pcm->card);
2143         return err;
2144 }
2145
2146 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2147 {
2148         int err;
2149         wait_queue_t wait;
2150
2151         if (pcm == NULL) {
2152                 err = -ENODEV;
2153                 goto __error1;
2154         }
2155         err = snd_card_file_add(pcm->card, file);
2156         if (err < 0)
2157                 goto __error1;
2158         if (!try_module_get(pcm->card->module)) {
2159                 err = -EFAULT;
2160                 goto __error2;
2161         }
2162         init_waitqueue_entry(&wait, current);
2163         add_wait_queue(&pcm->open_wait, &wait);
2164         mutex_lock(&pcm->open_mutex);
2165         while (1) {
2166                 err = snd_pcm_open_file(file, pcm, stream);
2167                 if (err >= 0)
2168                         break;
2169                 if (err == -EAGAIN) {
2170                         if (file->f_flags & O_NONBLOCK) {
2171                                 err = -EBUSY;
2172                                 break;
2173                         }
2174                 } else
2175                         break;
2176                 set_current_state(TASK_INTERRUPTIBLE);
2177                 mutex_unlock(&pcm->open_mutex);
2178                 schedule();
2179                 mutex_lock(&pcm->open_mutex);
2180                 if (pcm->card->shutdown) {
2181                         err = -ENODEV;
2182                         break;
2183                 }
2184                 if (signal_pending(current)) {
2185                         err = -ERESTARTSYS;
2186                         break;
2187                 }
2188         }
2189         remove_wait_queue(&pcm->open_wait, &wait);
2190         mutex_unlock(&pcm->open_mutex);
2191         if (err < 0)
2192                 goto __error;
2193         return err;
2194
2195       __error:
2196         module_put(pcm->card->module);
2197       __error2:
2198         snd_card_file_remove(pcm->card, file);
2199       __error1:
2200         return err;
2201 }
2202
2203 static int snd_pcm_release(struct inode *inode, struct file *file)
2204 {
2205         struct snd_pcm *pcm;
2206         struct snd_pcm_substream *substream;
2207         struct snd_pcm_file *pcm_file;
2208
2209         pcm_file = file->private_data;
2210         substream = pcm_file->substream;
2211         if (snd_BUG_ON(!substream))
2212                 return -ENXIO;
2213         pcm = substream->pcm;
2214         mutex_lock(&pcm->open_mutex);
2215         snd_pcm_release_substream(substream);
2216         kfree(pcm_file);
2217         mutex_unlock(&pcm->open_mutex);
2218         wake_up(&pcm->open_wait);
2219         module_put(pcm->card->module);
2220         snd_card_file_remove(pcm->card, file);
2221         return 0;
2222 }
2223
2224 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2225                                                  snd_pcm_uframes_t frames)
2226 {
2227         struct snd_pcm_runtime *runtime = substream->runtime;
2228         snd_pcm_sframes_t appl_ptr;
2229         snd_pcm_sframes_t ret;
2230         snd_pcm_sframes_t hw_avail;
2231
2232         if (frames == 0)
2233                 return 0;
2234
2235         snd_pcm_stream_lock_irq(substream);
2236         switch (runtime->status->state) {
2237         case SNDRV_PCM_STATE_PREPARED:
2238                 break;
2239         case SNDRV_PCM_STATE_DRAINING:
2240         case SNDRV_PCM_STATE_RUNNING:
2241                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2242                         break;
2243                 /* Fall through */
2244         case SNDRV_PCM_STATE_XRUN:
2245                 ret = -EPIPE;
2246                 goto __end;
2247         case SNDRV_PCM_STATE_SUSPENDED:
2248                 ret = -ESTRPIPE;
2249                 goto __end;
2250         default:
2251                 ret = -EBADFD;
2252                 goto __end;
2253         }
2254
2255         hw_avail = snd_pcm_playback_hw_avail(runtime);
2256         if (hw_avail <= 0) {
2257                 ret = 0;
2258                 goto __end;
2259         }
2260         if (frames > (snd_pcm_uframes_t)hw_avail)
2261                 frames = hw_avail;
2262         appl_ptr = runtime->control->appl_ptr - frames;
2263         if (appl_ptr < 0)
2264                 appl_ptr += runtime->boundary;
2265         runtime->control->appl_ptr = appl_ptr;
2266         ret = frames;
2267  __end:
2268         snd_pcm_stream_unlock_irq(substream);
2269         return ret;
2270 }
2271
2272 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2273                                                 snd_pcm_uframes_t frames)
2274 {
2275         struct snd_pcm_runtime *runtime = substream->runtime;
2276         snd_pcm_sframes_t appl_ptr;
2277         snd_pcm_sframes_t ret;
2278         snd_pcm_sframes_t hw_avail;
2279
2280         if (frames == 0)
2281                 return 0;
2282
2283         snd_pcm_stream_lock_irq(substream);
2284         switch (runtime->status->state) {
2285         case SNDRV_PCM_STATE_PREPARED:
2286         case SNDRV_PCM_STATE_DRAINING:
2287                 break;
2288         case SNDRV_PCM_STATE_RUNNING:
2289                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2290                         break;
2291                 /* Fall through */
2292         case SNDRV_PCM_STATE_XRUN:
2293                 ret = -EPIPE;
2294                 goto __end;
2295         case SNDRV_PCM_STATE_SUSPENDED:
2296                 ret = -ESTRPIPE;
2297                 goto __end;
2298         default:
2299                 ret = -EBADFD;
2300                 goto __end;
2301         }
2302
2303         hw_avail = snd_pcm_capture_hw_avail(runtime);
2304         if (hw_avail <= 0) {
2305                 ret = 0;
2306                 goto __end;
2307         }
2308         if (frames > (snd_pcm_uframes_t)hw_avail)
2309                 frames = hw_avail;
2310         appl_ptr = runtime->control->appl_ptr - frames;
2311         if (appl_ptr < 0)
2312                 appl_ptr += runtime->boundary;
2313         runtime->control->appl_ptr = appl_ptr;
2314         ret = frames;
2315  __end:
2316         snd_pcm_stream_unlock_irq(substream);
2317         return ret;
2318 }
2319
2320 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2321                                                   snd_pcm_uframes_t frames)
2322 {
2323         struct snd_pcm_runtime *runtime = substream->runtime;
2324         snd_pcm_sframes_t appl_ptr;
2325         snd_pcm_sframes_t ret;
2326         snd_pcm_sframes_t avail;
2327
2328         if (frames == 0)
2329                 return 0;
2330
2331         snd_pcm_stream_lock_irq(substream);
2332         switch (runtime->status->state) {
2333         case SNDRV_PCM_STATE_PREPARED:
2334         case SNDRV_PCM_STATE_PAUSED:
2335                 break;
2336         case SNDRV_PCM_STATE_DRAINING:
2337         case SNDRV_PCM_STATE_RUNNING:
2338                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2339                         break;
2340                 /* Fall through */
2341         case SNDRV_PCM_STATE_XRUN:
2342                 ret = -EPIPE;
2343                 goto __end;
2344         case SNDRV_PCM_STATE_SUSPENDED:
2345                 ret = -ESTRPIPE;
2346                 goto __end;
2347         default:
2348                 ret = -EBADFD;
2349                 goto __end;
2350         }
2351
2352         avail = snd_pcm_playback_avail(runtime);
2353         if (avail <= 0) {
2354                 ret = 0;
2355                 goto __end;
2356         }
2357         if (frames > (snd_pcm_uframes_t)avail)
2358                 frames = avail;
2359         appl_ptr = runtime->control->appl_ptr + frames;
2360         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2361                 appl_ptr -= runtime->boundary;
2362         runtime->control->appl_ptr = appl_ptr;
2363         ret = frames;
2364  __end:
2365         snd_pcm_stream_unlock_irq(substream);
2366         return ret;
2367 }
2368
2369 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2370                                                  snd_pcm_uframes_t frames)
2371 {
2372         struct snd_pcm_runtime *runtime = substream->runtime;
2373         snd_pcm_sframes_t appl_ptr;
2374         snd_pcm_sframes_t ret;
2375         snd_pcm_sframes_t avail;
2376
2377         if (frames == 0)
2378                 return 0;
2379
2380         snd_pcm_stream_lock_irq(substream);
2381         switch (runtime->status->state) {
2382         case SNDRV_PCM_STATE_PREPARED:
2383         case SNDRV_PCM_STATE_DRAINING:
2384         case SNDRV_PCM_STATE_PAUSED:
2385                 break;
2386         case SNDRV_PCM_STATE_RUNNING:
2387                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2388                         break;
2389                 /* Fall through */
2390         case SNDRV_PCM_STATE_XRUN:
2391                 ret = -EPIPE;
2392                 goto __end;
2393         case SNDRV_PCM_STATE_SUSPENDED:
2394                 ret = -ESTRPIPE;
2395                 goto __end;
2396         default:
2397                 ret = -EBADFD;
2398                 goto __end;
2399         }
2400
2401         avail = snd_pcm_capture_avail(runtime);
2402         if (avail <= 0) {
2403                 ret = 0;
2404                 goto __end;
2405         }
2406         if (frames > (snd_pcm_uframes_t)avail)
2407                 frames = avail;
2408         appl_ptr = runtime->control->appl_ptr + frames;
2409         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2410                 appl_ptr -= runtime->boundary;
2411         runtime->control->appl_ptr = appl_ptr;
2412         ret = frames;
2413  __end:
2414         snd_pcm_stream_unlock_irq(substream);
2415         return ret;
2416 }
2417
2418 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2419 {
2420         struct snd_pcm_runtime *runtime = substream->runtime;
2421         int err;
2422
2423         snd_pcm_stream_lock_irq(substream);
2424         switch (runtime->status->state) {
2425         case SNDRV_PCM_STATE_DRAINING:
2426                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2427                         goto __badfd;
2428         case SNDRV_PCM_STATE_RUNNING:
2429                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2430                         break;
2431                 /* Fall through */
2432         case SNDRV_PCM_STATE_PREPARED:
2433         case SNDRV_PCM_STATE_SUSPENDED:
2434                 err = 0;
2435                 break;
2436         case SNDRV_PCM_STATE_XRUN:
2437                 err = -EPIPE;
2438                 break;
2439         default:
2440               __badfd:
2441                 err = -EBADFD;
2442                 break;
2443         }
2444         snd_pcm_stream_unlock_irq(substream);
2445         return err;
2446 }
2447
2448 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2449                          snd_pcm_sframes_t __user *res)
2450 {
2451         struct snd_pcm_runtime *runtime = substream->runtime;
2452         int err;
2453         snd_pcm_sframes_t n = 0;
2454
2455         snd_pcm_stream_lock_irq(substream);
2456         switch (runtime->status->state) {
2457         case SNDRV_PCM_STATE_DRAINING:
2458                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2459                         goto __badfd;
2460         case SNDRV_PCM_STATE_RUNNING:
2461                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2462                         break;
2463                 /* Fall through */
2464         case SNDRV_PCM_STATE_PREPARED:
2465         case SNDRV_PCM_STATE_SUSPENDED:
2466                 err = 0;
2467                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2468                         n = snd_pcm_playback_hw_avail(runtime);
2469                 else
2470                         n = snd_pcm_capture_avail(runtime);
2471                 n += runtime->delay;
2472                 break;
2473         case SNDRV_PCM_STATE_XRUN:
2474                 err = -EPIPE;
2475                 break;
2476         default:
2477               __badfd:
2478                 err = -EBADFD;
2479                 break;
2480         }
2481         snd_pcm_stream_unlock_irq(substream);
2482         if (!err)
2483                 if (put_user(n, res))
2484                         err = -EFAULT;
2485         return err;
2486 }
2487
2488 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2489                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2490 {
2491         struct snd_pcm_runtime *runtime = substream->runtime;
2492         struct snd_pcm_sync_ptr sync_ptr;
2493         volatile struct snd_pcm_mmap_status *status;
2494         volatile struct snd_pcm_mmap_control *control;
2495         int err;
2496
2497         memset(&sync_ptr, 0, sizeof(sync_ptr));
2498         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2499                 return -EFAULT;
2500         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2501                 return -EFAULT;
2502         status = runtime->status;
2503         control = runtime->control;
2504         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2505                 err = snd_pcm_hwsync(substream);
2506                 if (err < 0)
2507                         return err;
2508         }
2509         snd_pcm_stream_lock_irq(substream);
2510         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2511                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2512         else
2513                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2514         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2515                 control->avail_min = sync_ptr.c.control.avail_min;
2516         else
2517                 sync_ptr.c.control.avail_min = control->avail_min;
2518         sync_ptr.s.status.state = status->state;
2519         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2520         sync_ptr.s.status.tstamp = status->tstamp;
2521         sync_ptr.s.status.suspended_state = status->suspended_state;
2522         snd_pcm_stream_unlock_irq(substream);
2523         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2524                 return -EFAULT;
2525         return 0;
2526 }
2527
2528 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2529 {
2530         struct snd_pcm_runtime *runtime = substream->runtime;
2531         int arg;
2532
2533         if (get_user(arg, _arg))
2534                 return -EFAULT;
2535         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2536                 return -EINVAL;
2537         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2538         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2539                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2540         return 0;
2541 }
2542
2543 static int snd_pcm_common_ioctl1(struct file *file,
2544                                  struct snd_pcm_substream *substream,
2545                                  unsigned int cmd, void __user *arg)
2546 {
2547         switch (cmd) {
2548         case SNDRV_PCM_IOCTL_PVERSION:
2549                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2550         case SNDRV_PCM_IOCTL_INFO:
2551                 return snd_pcm_info_user(substream, arg);
2552         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2553                 return 0;
2554         case SNDRV_PCM_IOCTL_TTSTAMP:
2555                 return snd_pcm_tstamp(substream, arg);
2556         case SNDRV_PCM_IOCTL_HW_REFINE:
2557                 return snd_pcm_hw_refine_user(substream, arg);
2558         case SNDRV_PCM_IOCTL_HW_PARAMS:
2559                 return snd_pcm_hw_params_user(substream, arg);
2560         case SNDRV_PCM_IOCTL_HW_FREE:
2561                 return snd_pcm_hw_free(substream);
2562         case SNDRV_PCM_IOCTL_SW_PARAMS:
2563                 return snd_pcm_sw_params_user(substream, arg);
2564         case SNDRV_PCM_IOCTL_STATUS:
2565                 return snd_pcm_status_user(substream, arg);
2566         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2567                 return snd_pcm_channel_info_user(substream, arg);
2568         case SNDRV_PCM_IOCTL_PREPARE:
2569                 return snd_pcm_prepare(substream, file);
2570         case SNDRV_PCM_IOCTL_RESET:
2571                 return snd_pcm_reset(substream);
2572         case SNDRV_PCM_IOCTL_START:
2573                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2574         case SNDRV_PCM_IOCTL_LINK:
2575                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2576         case SNDRV_PCM_IOCTL_UNLINK:
2577                 return snd_pcm_unlink(substream);
2578         case SNDRV_PCM_IOCTL_RESUME:
2579                 return snd_pcm_resume(substream);
2580         case SNDRV_PCM_IOCTL_XRUN:
2581                 return snd_pcm_xrun(substream);
2582         case SNDRV_PCM_IOCTL_HWSYNC:
2583                 return snd_pcm_hwsync(substream);
2584         case SNDRV_PCM_IOCTL_DELAY:
2585                 return snd_pcm_delay(substream, arg);
2586         case SNDRV_PCM_IOCTL_SYNC_PTR:
2587                 return snd_pcm_sync_ptr(substream, arg);
2588 #ifdef CONFIG_SND_SUPPORT_OLD_API
2589         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2590                 return snd_pcm_hw_refine_old_user(substream, arg);
2591         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2592                 return snd_pcm_hw_params_old_user(substream, arg);
2593 #endif
2594         case SNDRV_PCM_IOCTL_DRAIN:
2595                 return snd_pcm_drain(substream, file);
2596         case SNDRV_PCM_IOCTL_DROP:
2597                 return snd_pcm_drop(substream);
2598         case SNDRV_PCM_IOCTL_PAUSE:
2599         {
2600                 int res;
2601                 snd_pcm_stream_lock_irq(substream);
2602                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2603                 snd_pcm_stream_unlock_irq(substream);
2604                 return res;
2605         }
2606         }
2607         snd_printd("unknown ioctl = 0x%x\n", cmd);
2608         return -ENOTTY;
2609 }
2610
2611 static int snd_pcm_playback_ioctl1(struct file *file,
2612                                    struct snd_pcm_substream *substream,
2613                                    unsigned int cmd, void __user *arg)
2614 {
2615         if (snd_BUG_ON(!substream))
2616                 return -ENXIO;
2617         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2618                 return -EINVAL;
2619         switch (cmd) {
2620         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2621         {
2622                 struct snd_xferi xferi;
2623                 struct snd_xferi __user *_xferi = arg;
2624                 struct snd_pcm_runtime *runtime = substream->runtime;
2625                 snd_pcm_sframes_t result;
2626                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2627                         return -EBADFD;
2628                 if (put_user(0, &_xferi->result))
2629                         return -EFAULT;
2630                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2631                         return -EFAULT;
2632                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2633                 __put_user(result, &_xferi->result);
2634                 return result < 0 ? result : 0;
2635         }
2636         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2637         {
2638                 struct snd_xfern xfern;
2639                 struct snd_xfern __user *_xfern = arg;
2640                 struct snd_pcm_runtime *runtime = substream->runtime;
2641                 void __user **bufs;
2642                 snd_pcm_sframes_t result;
2643                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2644                         return -EBADFD;
2645                 if (runtime->channels > 128)
2646                         return -EINVAL;
2647                 if (put_user(0, &_xfern->result))
2648                         return -EFAULT;
2649                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2650                         return -EFAULT;
2651
2652                 bufs = memdup_user(xfern.bufs,
2653                                    sizeof(void *) * runtime->channels);
2654                 if (IS_ERR(bufs))
2655                         return PTR_ERR(bufs);
2656                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2657                 kfree(bufs);
2658                 __put_user(result, &_xfern->result);
2659                 return result < 0 ? result : 0;
2660         }
2661         case SNDRV_PCM_IOCTL_REWIND:
2662         {
2663                 snd_pcm_uframes_t frames;
2664                 snd_pcm_uframes_t __user *_frames = arg;
2665                 snd_pcm_sframes_t result;
2666                 if (get_user(frames, _frames))
2667                         return -EFAULT;
2668                 if (put_user(0, _frames))
2669                         return -EFAULT;
2670                 result = snd_pcm_playback_rewind(substream, frames);
2671                 __put_user(result, _frames);
2672                 return result < 0 ? result : 0;
2673         }
2674         case SNDRV_PCM_IOCTL_FORWARD:
2675         {
2676                 snd_pcm_uframes_t frames;
2677                 snd_pcm_uframes_t __user *_frames = arg;
2678                 snd_pcm_sframes_t result;
2679                 if (get_user(frames, _frames))
2680                         return -EFAULT;
2681                 if (put_user(0, _frames))
2682                         return -EFAULT;
2683                 result = snd_pcm_playback_forward(substream, frames);
2684                 __put_user(result, _frames);
2685                 return result < 0 ? result : 0;
2686         }
2687         }
2688         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2689 }
2690
2691 static int snd_pcm_capture_ioctl1(struct file *file,
2692                                   struct snd_pcm_substream *substream,
2693                                   unsigned int cmd, void __user *arg)
2694 {
2695         if (snd_BUG_ON(!substream))
2696                 return -ENXIO;
2697         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2698                 return -EINVAL;
2699         switch (cmd) {
2700         case SNDRV_PCM_IOCTL_READI_FRAMES:
2701         {
2702                 struct snd_xferi xferi;
2703                 struct snd_xferi __user *_xferi = arg;
2704                 struct snd_pcm_runtime *runtime = substream->runtime;
2705                 snd_pcm_sframes_t result;
2706                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2707                         return -EBADFD;
2708                 if (put_user(0, &_xferi->result))
2709                         return -EFAULT;
2710                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2711                         return -EFAULT;
2712                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2713                 __put_user(result, &_xferi->result);
2714                 return result < 0 ? result : 0;
2715         }
2716         case SNDRV_PCM_IOCTL_READN_FRAMES:
2717         {
2718                 struct snd_xfern xfern;
2719                 struct snd_xfern __user *_xfern = arg;
2720                 struct snd_pcm_runtime *runtime = substream->runtime;
2721                 void *bufs;
2722                 snd_pcm_sframes_t result;
2723                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2724                         return -EBADFD;
2725                 if (runtime->channels > 128)
2726                         return -EINVAL;
2727                 if (put_user(0, &_xfern->result))
2728                         return -EFAULT;
2729                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2730                         return -EFAULT;
2731
2732                 bufs = memdup_user(xfern.bufs,
2733                                    sizeof(void *) * runtime->channels);
2734                 if (IS_ERR(bufs))
2735                         return PTR_ERR(bufs);
2736                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2737                 kfree(bufs);
2738                 __put_user(result, &_xfern->result);
2739                 return result < 0 ? result : 0;
2740         }
2741         case SNDRV_PCM_IOCTL_REWIND:
2742         {
2743                 snd_pcm_uframes_t frames;
2744                 snd_pcm_uframes_t __user *_frames = arg;
2745                 snd_pcm_sframes_t result;
2746                 if (get_user(frames, _frames))
2747                         return -EFAULT;
2748                 if (put_user(0, _frames))
2749                         return -EFAULT;
2750                 result = snd_pcm_capture_rewind(substream, frames);
2751                 __put_user(result, _frames);
2752                 return result < 0 ? result : 0;
2753         }
2754         case SNDRV_PCM_IOCTL_FORWARD:
2755         {
2756                 snd_pcm_uframes_t frames;
2757                 snd_pcm_uframes_t __user *_frames = arg;
2758                 snd_pcm_sframes_t result;
2759                 if (get_user(frames, _frames))
2760                         return -EFAULT;
2761                 if (put_user(0, _frames))
2762                         return -EFAULT;
2763                 result = snd_pcm_capture_forward(substream, frames);
2764                 __put_user(result, _frames);
2765                 return result < 0 ? result : 0;
2766         }
2767         }
2768         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2769 }
2770
2771 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2772                                    unsigned long arg)
2773 {
2774         struct snd_pcm_file *pcm_file;
2775
2776         pcm_file = file->private_data;
2777
2778         if (((cmd >> 8) & 0xff) != 'A')
2779                 return -ENOTTY;
2780
2781         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2782                                        (void __user *)arg);
2783 }
2784
2785 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2786                                   unsigned long arg)
2787 {
2788         struct snd_pcm_file *pcm_file;
2789
2790         pcm_file = file->private_data;
2791
2792         if (((cmd >> 8) & 0xff) != 'A')
2793                 return -ENOTTY;
2794
2795         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2796                                       (void __user *)arg);
2797 }
2798
2799 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2800                          unsigned int cmd, void *arg)
2801 {
2802         mm_segment_t fs;
2803         int result;
2804
2805         fs = snd_enter_user();
2806         switch (substream->stream) {
2807         case SNDRV_PCM_STREAM_PLAYBACK:
2808                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2809                                                  (void __user *)arg);
2810                 break;
2811         case SNDRV_PCM_STREAM_CAPTURE:
2812                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2813                                                 (void __user *)arg);
2814                 break;
2815         default:
2816                 result = -EINVAL;
2817                 break;
2818         }
2819         snd_leave_user(fs);
2820         return result;
2821 }
2822
2823 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2824
2825 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2826                             loff_t * offset)
2827 {
2828         struct snd_pcm_file *pcm_file;
2829         struct snd_pcm_substream *substream;
2830         struct snd_pcm_runtime *runtime;
2831         snd_pcm_sframes_t result;
2832
2833         pcm_file = file->private_data;
2834         substream = pcm_file->substream;
2835         if (PCM_RUNTIME_CHECK(substream))
2836                 return -ENXIO;
2837         runtime = substream->runtime;
2838         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2839                 return -EBADFD;
2840         if (!frame_aligned(runtime, count))
2841                 return -EINVAL;
2842         count = bytes_to_frames(runtime, count);
2843         result = snd_pcm_lib_read(substream, buf, count);
2844         if (result > 0)
2845                 result = frames_to_bytes(runtime, result);
2846         return result;
2847 }
2848
2849 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2850                              size_t count, loff_t * offset)
2851 {
2852         struct snd_pcm_file *pcm_file;
2853         struct snd_pcm_substream *substream;
2854         struct snd_pcm_runtime *runtime;
2855         snd_pcm_sframes_t result;
2856
2857         pcm_file = file->private_data;
2858         substream = pcm_file->substream;
2859         if (PCM_RUNTIME_CHECK(substream))
2860                 return -ENXIO;
2861         runtime = substream->runtime;
2862         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2863                 return -EBADFD;
2864         if (!frame_aligned(runtime, count))
2865                 return -EINVAL;
2866         count = bytes_to_frames(runtime, count);
2867         result = snd_pcm_lib_write(substream, buf, count);
2868         if (result > 0)
2869                 result = frames_to_bytes(runtime, result);
2870         return result;
2871 }
2872
2873 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2874                              unsigned long nr_segs, loff_t pos)
2875
2876 {
2877         struct snd_pcm_file *pcm_file;
2878         struct snd_pcm_substream *substream;
2879         struct snd_pcm_runtime *runtime;
2880         snd_pcm_sframes_t result;
2881         unsigned long i;
2882         void __user **bufs;
2883         snd_pcm_uframes_t frames;
2884
2885         pcm_file = iocb->ki_filp->private_data;
2886         substream = pcm_file->substream;
2887         if (PCM_RUNTIME_CHECK(substream))
2888                 return -ENXIO;
2889         runtime = substream->runtime;
2890         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2891                 return -EBADFD;
2892         if (nr_segs > 1024 || nr_segs != runtime->channels)
2893                 return -EINVAL;
2894         if (!frame_aligned(runtime, iov->iov_len))
2895                 return -EINVAL;
2896         frames = bytes_to_samples(runtime, iov->iov_len);
2897         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2898         if (bufs == NULL)
2899                 return -ENOMEM;
2900         for (i = 0; i < nr_segs; ++i)
2901                 bufs[i] = iov[i].iov_base;
2902         result = snd_pcm_lib_readv(substream, bufs, frames);
2903         if (result > 0)
2904                 result = frames_to_bytes(runtime, result);
2905         kfree(bufs);
2906         return result;
2907 }
2908
2909 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2910                               unsigned long nr_segs, loff_t pos)
2911 {
2912         struct snd_pcm_file *pcm_file;
2913         struct snd_pcm_substream *substream;
2914         struct snd_pcm_runtime *runtime;
2915         snd_pcm_sframes_t result;
2916         unsigned long i;
2917         void __user **bufs;
2918         snd_pcm_uframes_t frames;
2919
2920         pcm_file = iocb->ki_filp->private_data;
2921         substream = pcm_file->substream;
2922         if (PCM_RUNTIME_CHECK(substream))
2923                 return -ENXIO;
2924         runtime = substream->runtime;
2925         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2926                 return -EBADFD;
2927         if (nr_segs > 128 || nr_segs != runtime->channels ||
2928             !frame_aligned(runtime, iov->iov_len))
2929                 return -EINVAL;
2930         frames = bytes_to_samples(runtime, iov->iov_len);
2931         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2932         if (bufs == NULL)
2933                 return -ENOMEM;
2934         for (i = 0; i < nr_segs; ++i)
2935                 bufs[i] = iov[i].iov_base;
2936         result = snd_pcm_lib_writev(substream, bufs, frames);
2937         if (result > 0)
2938                 result = frames_to_bytes(runtime, result);
2939         kfree(bufs);
2940         return result;
2941 }
2942
2943 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2944 {
2945         struct snd_pcm_file *pcm_file;
2946         struct snd_pcm_substream *substream;
2947         struct snd_pcm_runtime *runtime;
2948         unsigned int mask;
2949         snd_pcm_uframes_t avail;
2950
2951         pcm_file = file->private_data;
2952
2953         substream = pcm_file->substream;
2954         if (PCM_RUNTIME_CHECK(substream))
2955                 return -ENXIO;
2956         runtime = substream->runtime;
2957
2958         poll_wait(file, &runtime->sleep, wait);
2959
2960         snd_pcm_stream_lock_irq(substream);
2961         avail = snd_pcm_playback_avail(runtime);
2962         switch (runtime->status->state) {
2963         case SNDRV_PCM_STATE_RUNNING:
2964         case SNDRV_PCM_STATE_PREPARED:
2965         case SNDRV_PCM_STATE_PAUSED:
2966                 if (avail >= runtime->control->avail_min) {
2967                         mask = POLLOUT | POLLWRNORM;
2968                         break;
2969                 }
2970                 /* Fall through */
2971         case SNDRV_PCM_STATE_DRAINING:
2972                 mask = 0;
2973                 break;
2974         default:
2975                 mask = POLLOUT | POLLWRNORM | POLLERR;
2976                 break;
2977         }
2978         snd_pcm_stream_unlock_irq(substream);
2979         return mask;
2980 }
2981
2982 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2983 {
2984         struct snd_pcm_file *pcm_file;
2985         struct snd_pcm_substream *substream;
2986         struct snd_pcm_runtime *runtime;
2987         unsigned int mask;
2988         snd_pcm_uframes_t avail;
2989
2990         pcm_file = file->private_data;
2991
2992         substream = pcm_file->substream;
2993         if (PCM_RUNTIME_CHECK(substream))
2994                 return -ENXIO;
2995         runtime = substream->runtime;
2996
2997         poll_wait(file, &runtime->sleep, wait);
2998
2999         snd_pcm_stream_lock_irq(substream);
3000         avail = snd_pcm_capture_avail(runtime);
3001         switch (runtime->status->state) {
3002         case SNDRV_PCM_STATE_RUNNING:
3003         case SNDRV_PCM_STATE_PREPARED:
3004         case SNDRV_PCM_STATE_PAUSED:
3005                 if (avail >= runtime->control->avail_min) {
3006                         mask = POLLIN | POLLRDNORM;
3007                         break;
3008                 }
3009                 mask = 0;
3010                 break;
3011         case SNDRV_PCM_STATE_DRAINING:
3012                 if (avail > 0) {
3013                         mask = POLLIN | POLLRDNORM;
3014                         break;
3015                 }
3016                 /* Fall through */
3017         default:
3018                 mask = POLLIN | POLLRDNORM | POLLERR;
3019                 break;
3020         }
3021         snd_pcm_stream_unlock_irq(substream);
3022         return mask;
3023 }
3024
3025 /*
3026  * mmap support
3027  */
3028
3029 /*
3030  * Only on coherent architectures, we can mmap the status and the control records
3031  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3032  */
3033 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3034 /*
3035  * mmap status record
3036  */
3037 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3038                                                 struct vm_fault *vmf)
3039 {
3040         struct snd_pcm_substream *substream = area->vm_private_data;
3041         struct snd_pcm_runtime *runtime;
3042
3043         if (substream == NULL)
3044                 return VM_FAULT_SIGBUS;
3045         runtime = substream->runtime;
3046         vmf->page = virt_to_page(runtime->status);
3047         get_page(vmf->page);
3048         return 0;
3049 }
3050
3051 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3052 {
3053         .fault =        snd_pcm_mmap_status_fault,
3054 };
3055
3056 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3057                                struct vm_area_struct *area)
3058 {
3059         long size;
3060         if (!(area->vm_flags & VM_READ))
3061                 return -EINVAL;
3062         size = area->vm_end - area->vm_start;
3063         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3064                 return -EINVAL;
3065         area->vm_ops = &snd_pcm_vm_ops_status;
3066         area->vm_private_data = substream;
3067         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3068         return 0;
3069 }
3070
3071 /*
3072  * mmap control record
3073  */
3074 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3075                                                 struct vm_fault *vmf)
3076 {
3077         struct snd_pcm_substream *substream = area->vm_private_data;
3078         struct snd_pcm_runtime *runtime;
3079
3080         if (substream == NULL)
3081                 return VM_FAULT_SIGBUS;
3082         runtime = substream->runtime;
3083         vmf->page = virt_to_page(runtime->control);
3084         get_page(vmf->page);
3085         return 0;
3086 }
3087
3088 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3089 {
3090         .fault =        snd_pcm_mmap_control_fault,
3091 };
3092
3093 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3094                                 struct vm_area_struct *area)
3095 {
3096         long size;
3097         if (!(area->vm_flags & VM_READ))
3098                 return -EINVAL;
3099         size = area->vm_end - area->vm_start;
3100         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3101                 return -EINVAL;
3102         area->vm_ops = &snd_pcm_vm_ops_control;
3103         area->vm_private_data = substream;
3104         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3105         return 0;
3106 }
3107 #else /* ! coherent mmap */
3108 /*
3109  * don't support mmap for status and control records.
3110  */
3111 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3112                                struct vm_area_struct *area)
3113 {
3114         return -ENXIO;
3115 }
3116 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3117                                 struct vm_area_struct *area)
3118 {
3119         return -ENXIO;
3120 }
3121 #endif /* coherent mmap */
3122
3123 static inline struct page *
3124 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3125 {
3126         void *vaddr = substream->runtime->dma_area + ofs;
3127 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3128         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3129                 return virt_to_page(CAC_ADDR(vaddr));
3130 #endif
3131 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3132         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3133                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3134                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3135                 /* assume dma_handle set via pfn_to_phys() in
3136                  * mm/dma-noncoherent.c
3137                  */
3138                 return pfn_to_page(addr >> PAGE_SHIFT);
3139         }
3140 #endif
3141         return virt_to_page(vaddr);
3142 }
3143
3144 /*
3145  * fault callback for mmapping a RAM page
3146  */
3147 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3148                                                 struct vm_fault *vmf)
3149 {
3150         struct snd_pcm_substream *substream = area->vm_private_data;
3151         struct snd_pcm_runtime *runtime;
3152         unsigned long offset;
3153         struct page * page;
3154         size_t dma_bytes;
3155
3156         if (substream == NULL)
3157                 return VM_FAULT_SIGBUS;
3158         runtime = substream->runtime;
3159         offset = vmf->pgoff << PAGE_SHIFT;
3160         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3161         if (offset > dma_bytes - PAGE_SIZE)
3162                 return VM_FAULT_SIGBUS;
3163         if (substream->ops->page)
3164                 page = substream->ops->page(substream, offset);
3165         else
3166                 page = snd_pcm_default_page_ops(substream, offset);
3167         if (!page)
3168                 return VM_FAULT_SIGBUS;
3169         get_page(page);
3170         vmf->page = page;
3171         return 0;
3172 }
3173
3174 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3175         .open =         snd_pcm_mmap_data_open,
3176         .close =        snd_pcm_mmap_data_close,
3177 };
3178
3179 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3180         .open =         snd_pcm_mmap_data_open,
3181         .close =        snd_pcm_mmap_data_close,
3182         .fault =        snd_pcm_mmap_data_fault,
3183 };
3184
3185 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3186 /* This should be defined / handled globally! */
3187 #ifdef CONFIG_ARM
3188 #define ARCH_HAS_DMA_MMAP_COHERENT
3189 #endif
3190 #endif
3191
3192 /*
3193  * mmap the DMA buffer on RAM
3194  */
3195 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3196                              struct vm_area_struct *area)
3197 {
3198         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3199 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3200         if (!substream->ops->page &&
3201             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3202                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3203                                          area,
3204                                          substream->runtime->dma_area,
3205                                          substream->runtime->dma_addr,
3206                                          area->vm_end - area->vm_start);
3207 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3208         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3209             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3210                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3211 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3212         /* mmap with fault handler */
3213         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3214         return 0;
3215 }
3216 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3217
3218 /*
3219  * mmap the DMA buffer on I/O memory area
3220  */
3221 #if SNDRV_PCM_INFO_MMAP_IOMEM
3222 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3223                            struct vm_area_struct *area)
3224 {
3225         long size;
3226         unsigned long offset;
3227
3228         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3229         area->vm_flags |= VM_IO;
3230         size = area->vm_end - area->vm_start;
3231         offset = area->vm_pgoff << PAGE_SHIFT;
3232         if (io_remap_pfn_range(area, area->vm_start,
3233                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3234                                 size, area->vm_page_prot))
3235                 return -EAGAIN;
3236         return 0;
3237 }
3238
3239 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3240 #endif /* SNDRV_PCM_INFO_MMAP */
3241
3242 /*
3243  * mmap DMA buffer
3244  */
3245 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3246                       struct vm_area_struct *area)
3247 {
3248         struct snd_pcm_runtime *runtime;
3249         long size;
3250         unsigned long offset;
3251         size_t dma_bytes;
3252         int err;
3253
3254         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3255                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3256                         return -EINVAL;
3257         } else {
3258                 if (!(area->vm_flags & VM_READ))
3259                         return -EINVAL;
3260         }
3261         runtime = substream->runtime;
3262         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3263                 return -EBADFD;
3264         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3265                 return -ENXIO;
3266         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3267             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3268                 return -EINVAL;
3269         size = area->vm_end - area->vm_start;
3270         offset = area->vm_pgoff << PAGE_SHIFT;
3271         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3272         if ((size_t)size > dma_bytes)
3273                 return -EINVAL;
3274         if (offset > dma_bytes - size)
3275                 return -EINVAL;
3276
3277         area->vm_ops = &snd_pcm_vm_ops_data;
3278         area->vm_private_data = substream;
3279         if (substream->ops->mmap)
3280                 err = substream->ops->mmap(substream, area);
3281         else
3282                 err = snd_pcm_lib_default_mmap(substream, area);
3283         if (!err)
3284                 atomic_inc(&substream->mmap_count);
3285         return err;
3286 }
3287
3288 EXPORT_SYMBOL(snd_pcm_mmap_data);
3289
3290 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3291 {
3292         struct snd_pcm_file * pcm_file;
3293         struct snd_pcm_substream *substream;
3294         unsigned long offset;
3295
3296         pcm_file = file->private_data;
3297         substream = pcm_file->substream;
3298         if (PCM_RUNTIME_CHECK(substream))
3299                 return -ENXIO;
3300
3301         offset = area->vm_pgoff << PAGE_SHIFT;
3302         switch (offset) {
3303         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3304                 if (pcm_file->no_compat_mmap)
3305                         return -ENXIO;
3306                 return snd_pcm_mmap_status(substream, file, area);
3307         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3308                 if (pcm_file->no_compat_mmap)
3309                         return -ENXIO;
3310                 return snd_pcm_mmap_control(substream, file, area);
3311         default:
3312                 return snd_pcm_mmap_data(substream, file, area);
3313         }
3314         return 0;
3315 }
3316
3317 static int snd_pcm_fasync(int fd, struct file * file, int on)
3318 {
3319         struct snd_pcm_file * pcm_file;
3320         struct snd_pcm_substream *substream;
3321         struct snd_pcm_runtime *runtime;
3322
3323         pcm_file = file->private_data;
3324         substream = pcm_file->substream;
3325         if (PCM_RUNTIME_CHECK(substream))
3326                 return -ENXIO;
3327         runtime = substream->runtime;
3328         return fasync_helper(fd, file, on, &runtime->fasync);
3329 }
3330
3331 /*
3332  * ioctl32 compat
3333  */
3334 #ifdef CONFIG_COMPAT
3335 #include "pcm_compat.c"
3336 #else
3337 #define snd_pcm_ioctl_compat    NULL
3338 #endif
3339
3340 /*
3341  *  To be removed helpers to keep binary compatibility
3342  */
3343
3344 #ifdef CONFIG_SND_SUPPORT_OLD_API
3345 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3346 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3347
3348 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3349                                                struct snd_pcm_hw_params_old *oparams)
3350 {
3351         unsigned int i;
3352
3353         memset(params, 0, sizeof(*params));
3354         params->flags = oparams->flags;
3355         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3356                 params->masks[i].bits[0] = oparams->masks[i];
3357         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3358         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3359         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3360         params->info = oparams->info;
3361         params->msbits = oparams->msbits;
3362         params->rate_num = oparams->rate_num;
3363         params->rate_den = oparams->rate_den;
3364         params->fifo_size = oparams->fifo_size;
3365 }
3366
3367 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3368                                              struct snd_pcm_hw_params *params)
3369 {
3370         unsigned int i;
3371
3372         memset(oparams, 0, sizeof(*oparams));
3373         oparams->flags = params->flags;
3374         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3375                 oparams->masks[i] = params->masks[i].bits[0];
3376         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3377         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3378         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3379         oparams->info = params->info;
3380         oparams->msbits = params->msbits;
3381         oparams->rate_num = params->rate_num;
3382         oparams->rate_den = params->rate_den;
3383         oparams->fifo_size = params->fifo_size;
3384 }
3385
3386 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3387                                       struct snd_pcm_hw_params_old __user * _oparams)
3388 {
3389         struct snd_pcm_hw_params *params;
3390         struct snd_pcm_hw_params_old *oparams = NULL;
3391         int err;
3392
3393         params = kmalloc(sizeof(*params), GFP_KERNEL);
3394         if (!params)
3395                 return -ENOMEM;
3396
3397         oparams = memdup_user(_oparams, sizeof(*oparams));
3398         if (IS_ERR(oparams)) {
3399                 err = PTR_ERR(oparams);
3400                 goto out;
3401         }
3402         snd_pcm_hw_convert_from_old_params(params, oparams);
3403         err = snd_pcm_hw_refine(substream, params);
3404         snd_pcm_hw_convert_to_old_params(oparams, params);
3405         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3406                 if (!err)
3407                         err = -EFAULT;
3408         }
3409
3410         kfree(oparams);
3411 out:
3412         kfree(params);
3413         return err;
3414 }
3415
3416 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3417                                       struct snd_pcm_hw_params_old __user * _oparams)
3418 {
3419         struct snd_pcm_hw_params *params;
3420         struct snd_pcm_hw_params_old *oparams = NULL;
3421         int err;
3422
3423         params = kmalloc(sizeof(*params), GFP_KERNEL);
3424         if (!params)
3425                 return -ENOMEM;
3426
3427         oparams = memdup_user(_oparams, sizeof(*oparams));
3428         if (IS_ERR(oparams)) {
3429                 err = PTR_ERR(oparams);
3430                 goto out;
3431         }
3432         snd_pcm_hw_convert_from_old_params(params, oparams);
3433         err = snd_pcm_hw_params(substream, params);
3434         snd_pcm_hw_convert_to_old_params(oparams, params);
3435         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3436                 if (!err)
3437                         err = -EFAULT;
3438         }
3439
3440         kfree(oparams);
3441 out:
3442         kfree(params);
3443         return err;
3444 }
3445 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3446
3447 #ifndef CONFIG_MMU
3448 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3449                                                unsigned long addr,
3450                                                unsigned long len,
3451                                                unsigned long pgoff,
3452                                                unsigned long flags)
3453 {
3454         struct snd_pcm_file *pcm_file = file->private_data;
3455         struct snd_pcm_substream *substream = pcm_file->substream;
3456         struct snd_pcm_runtime *runtime = substream->runtime;
3457         unsigned long offset = pgoff << PAGE_SHIFT;
3458
3459         switch (offset) {
3460         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3461                 return (unsigned long)runtime->status;
3462         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3463                 return (unsigned long)runtime->control;
3464         default:
3465                 return (unsigned long)runtime->dma_area + offset;
3466         }
3467 }
3468 #else
3469 # define snd_pcm_get_unmapped_area NULL
3470 #endif
3471
3472 /*
3473  *  Register section
3474  */
3475
3476 const struct file_operations snd_pcm_f_ops[2] = {
3477         {
3478                 .owner =                THIS_MODULE,
3479                 .write =                snd_pcm_write,
3480                 .aio_write =            snd_pcm_aio_write,
3481                 .open =                 snd_pcm_playback_open,
3482                 .release =              snd_pcm_release,
3483                 .llseek =               no_llseek,
3484                 .poll =                 snd_pcm_playback_poll,
3485                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3486                 .compat_ioctl =         snd_pcm_ioctl_compat,
3487                 .mmap =                 snd_pcm_mmap,
3488                 .fasync =               snd_pcm_fasync,
3489                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3490         },
3491         {
3492                 .owner =                THIS_MODULE,
3493                 .read =                 snd_pcm_read,
3494                 .aio_read =             snd_pcm_aio_read,
3495                 .open =                 snd_pcm_capture_open,
3496                 .release =              snd_pcm_release,
3497                 .llseek =               no_llseek,
3498                 .poll =                 snd_pcm_capture_poll,
3499                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3500                 .compat_ioctl =         snd_pcm_ioctl_compat,
3501                 .mmap =                 snd_pcm_mmap,
3502                 .fasync =               snd_pcm_fasync,
3503                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3504         }
3505 };