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