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