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, int *fput_needed)
1567 {
1568         struct file *file;
1569         struct inode *inode;
1570         unsigned int minor;
1571
1572         file = fget_light(fd, fput_needed);
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_light(file, *fput_needed);
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_light(file, *fput_needed);
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         int fput_needed;
1601
1602         file = snd_pcm_file_fd(fd, &fput_needed);
1603         if (!file)
1604                 return -EBADFD;
1605         pcm_file = file->private_data;
1606         substream1 = pcm_file->substream;
1607         group = kmalloc(sizeof(*group), GFP_KERNEL);
1608         if (!group) {
1609                 res = -ENOMEM;
1610                 goto _nolock;
1611         }
1612         down_write(&snd_pcm_link_rwsem);
1613         write_lock_irq(&snd_pcm_link_rwlock);
1614         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1615             substream->runtime->status->state != substream1->runtime->status->state) {
1616                 res = -EBADFD;
1617                 goto _end;
1618         }
1619         if (snd_pcm_stream_linked(substream1)) {
1620                 res = -EALREADY;
1621                 goto _end;
1622         }
1623         if (!snd_pcm_stream_linked(substream)) {
1624                 substream->group = group;
1625                 spin_lock_init(&substream->group->lock);
1626                 INIT_LIST_HEAD(&substream->group->substreams);
1627                 list_add_tail(&substream->link_list, &substream->group->substreams);
1628                 substream->group->count = 1;
1629         }
1630         list_add_tail(&substream1->link_list, &substream->group->substreams);
1631         substream->group->count++;
1632         substream1->group = substream->group;
1633  _end:
1634         write_unlock_irq(&snd_pcm_link_rwlock);
1635         up_write(&snd_pcm_link_rwsem);
1636  _nolock:
1637         fput_light(file, fput_needed);
1638         if (res < 0)
1639                 kfree(group);
1640         return res;
1641 }
1642
1643 static void relink_to_local(struct snd_pcm_substream *substream)
1644 {
1645         substream->group = &substream->self_group;
1646         INIT_LIST_HEAD(&substream->self_group.substreams);
1647         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1648 }
1649
1650 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1651 {
1652         struct snd_pcm_substream *s;
1653         int res = 0;
1654
1655         down_write(&snd_pcm_link_rwsem);
1656         write_lock_irq(&snd_pcm_link_rwlock);
1657         if (!snd_pcm_stream_linked(substream)) {
1658                 res = -EALREADY;
1659                 goto _end;
1660         }
1661         list_del(&substream->link_list);
1662         substream->group->count--;
1663         if (substream->group->count == 1) {     /* detach the last stream, too */
1664                 snd_pcm_group_for_each_entry(s, substream) {
1665                         relink_to_local(s);
1666                         break;
1667                 }
1668                 kfree(substream->group);
1669         }
1670         relink_to_local(substream);
1671        _end:
1672         write_unlock_irq(&snd_pcm_link_rwlock);
1673         up_write(&snd_pcm_link_rwsem);
1674         return res;
1675 }
1676
1677 /*
1678  * hw configurator
1679  */
1680 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1681                                struct snd_pcm_hw_rule *rule)
1682 {
1683         struct snd_interval t;
1684         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1685                      hw_param_interval_c(params, rule->deps[1]), &t);
1686         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1687 }
1688
1689 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1690                                struct snd_pcm_hw_rule *rule)
1691 {
1692         struct snd_interval t;
1693         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1694                      hw_param_interval_c(params, rule->deps[1]), &t);
1695         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1696 }
1697
1698 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1699                                    struct snd_pcm_hw_rule *rule)
1700 {
1701         struct snd_interval t;
1702         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1703                          hw_param_interval_c(params, rule->deps[1]),
1704                          (unsigned long) rule->private, &t);
1705         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706 }
1707
1708 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1709                                    struct snd_pcm_hw_rule *rule)
1710 {
1711         struct snd_interval t;
1712         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1713                          (unsigned long) rule->private,
1714                          hw_param_interval_c(params, rule->deps[1]), &t);
1715         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1716 }
1717
1718 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1719                                   struct snd_pcm_hw_rule *rule)
1720 {
1721         unsigned int k;
1722         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1723         struct snd_mask m;
1724         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1725         snd_mask_any(&m);
1726         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1727                 int bits;
1728                 if (! snd_mask_test(mask, k))
1729                         continue;
1730                 bits = snd_pcm_format_physical_width(k);
1731                 if (bits <= 0)
1732                         continue; /* ignore invalid formats */
1733                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1734                         snd_mask_reset(&m, k);
1735         }
1736         return snd_mask_refine(mask, &m);
1737 }
1738
1739 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1740                                        struct snd_pcm_hw_rule *rule)
1741 {
1742         struct snd_interval t;
1743         unsigned int k;
1744         t.min = UINT_MAX;
1745         t.max = 0;
1746         t.openmin = 0;
1747         t.openmax = 0;
1748         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1749                 int bits;
1750                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1751                         continue;
1752                 bits = snd_pcm_format_physical_width(k);
1753                 if (bits <= 0)
1754                         continue; /* ignore invalid formats */
1755                 if (t.min > (unsigned)bits)
1756                         t.min = bits;
1757                 if (t.max < (unsigned)bits)
1758                         t.max = bits;
1759         }
1760         t.integer = 1;
1761         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1762 }
1763
1764 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1765 #error "Change this table"
1766 #endif
1767
1768 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1769                                  48000, 64000, 88200, 96000, 176400, 192000 };
1770
1771 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1772         .count = ARRAY_SIZE(rates),
1773         .list = rates,
1774 };
1775
1776 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1777                                 struct snd_pcm_hw_rule *rule)
1778 {
1779         struct snd_pcm_hardware *hw = rule->private;
1780         return snd_interval_list(hw_param_interval(params, rule->var),
1781                                  snd_pcm_known_rates.count,
1782                                  snd_pcm_known_rates.list, hw->rates);
1783 }
1784
1785 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1786                                             struct snd_pcm_hw_rule *rule)
1787 {
1788         struct snd_interval t;
1789         struct snd_pcm_substream *substream = rule->private;
1790         t.min = 0;
1791         t.max = substream->buffer_bytes_max;
1792         t.openmin = 0;
1793         t.openmax = 0;
1794         t.integer = 1;
1795         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1796 }
1797
1798 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1799 {
1800         struct snd_pcm_runtime *runtime = substream->runtime;
1801         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1802         int k, err;
1803
1804         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1805                 snd_mask_any(constrs_mask(constrs, k));
1806         }
1807
1808         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1809                 snd_interval_any(constrs_interval(constrs, k));
1810         }
1811
1812         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1813         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1814         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1815         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1816         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1817
1818         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1819                                    snd_pcm_hw_rule_format, NULL,
1820                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1821         if (err < 0)
1822                 return err;
1823         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1824                                   snd_pcm_hw_rule_sample_bits, NULL,
1825                                   SNDRV_PCM_HW_PARAM_FORMAT,
1826                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1827         if (err < 0)
1828                 return err;
1829         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1830                                   snd_pcm_hw_rule_div, NULL,
1831                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1832         if (err < 0)
1833                 return err;
1834         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1835                                   snd_pcm_hw_rule_mul, NULL,
1836                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1837         if (err < 0)
1838                 return err;
1839         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1840                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1841                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1842         if (err < 0)
1843                 return err;
1844         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1845                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1846                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1847         if (err < 0)
1848                 return err;
1849         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1850                                   snd_pcm_hw_rule_div, NULL,
1851                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1852         if (err < 0)
1853                 return err;
1854         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1855                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1856                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1857         if (err < 0)
1858                 return err;
1859         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1860                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1861                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1862         if (err < 0)
1863                 return err;
1864         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1865                                   snd_pcm_hw_rule_div, NULL,
1866                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1867         if (err < 0)
1868                 return err;
1869         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1870                                   snd_pcm_hw_rule_div, NULL,
1871                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1872         if (err < 0)
1873                 return err;
1874         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1875                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1876                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1877         if (err < 0)
1878                 return err;
1879         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1880                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1881                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1882         if (err < 0)
1883                 return err;
1884         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1885                                   snd_pcm_hw_rule_mul, NULL,
1886                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1887         if (err < 0)
1888                 return err;
1889         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1890                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1891                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1892         if (err < 0)
1893                 return err;
1894         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1895                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1896                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1897         if (err < 0)
1898                 return err;
1899         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1900                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1901                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1902         if (err < 0)
1903                 return err;
1904         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1905                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1906                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1907         if (err < 0)
1908                 return err;
1909         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1910                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1911                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1912         if (err < 0)
1913                 return err;
1914         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1915                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1916                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1917         if (err < 0)
1918                 return err;
1919         return 0;
1920 }
1921
1922 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1923 {
1924         struct snd_pcm_runtime *runtime = substream->runtime;
1925         struct snd_pcm_hardware *hw = &runtime->hw;
1926         int err;
1927         unsigned int mask = 0;
1928
1929         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1930                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1931         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1932                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1933         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1934                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1935                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1936                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1937                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1938                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1939                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1940         }
1941         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1942         if (err < 0)
1943                 return err;
1944
1945         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1946         if (err < 0)
1947                 return err;
1948
1949         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1950         if (err < 0)
1951                 return err;
1952
1953         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1954                                            hw->channels_min, hw->channels_max);
1955         if (err < 0)
1956                 return err;
1957
1958         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1959                                            hw->rate_min, hw->rate_max);
1960         if (err < 0)
1961                 return err;
1962
1963         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1964                                            hw->period_bytes_min, hw->period_bytes_max);
1965         if (err < 0)
1966                 return err;
1967
1968         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1969                                            hw->periods_min, hw->periods_max);
1970         if (err < 0)
1971                 return err;
1972
1973         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1974                                            hw->period_bytes_min, hw->buffer_bytes_max);
1975         if (err < 0)
1976                 return err;
1977
1978         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1979                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1980                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1981         if (err < 0)
1982                 return err;
1983
1984         /* FIXME: remove */
1985         if (runtime->dma_bytes) {
1986                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1987                 if (err < 0)
1988                         return -EINVAL;
1989         }
1990
1991         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1992                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1993                                           snd_pcm_hw_rule_rate, hw,
1994                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1995                 if (err < 0)
1996                         return err;
1997         }
1998
1999         /* FIXME: this belong to lowlevel */
2000         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2001
2002         return 0;
2003 }
2004
2005 static void pcm_release_private(struct snd_pcm_substream *substream)
2006 {
2007         snd_pcm_unlink(substream);
2008 }
2009
2010 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2011 {
2012         substream->ref_count--;
2013         if (substream->ref_count > 0)
2014                 return;
2015
2016         snd_pcm_drop(substream);
2017         if (substream->hw_opened) {
2018                 if (substream->ops->hw_free != NULL)
2019                         substream->ops->hw_free(substream);
2020                 substream->ops->close(substream);
2021                 substream->hw_opened = 0;
2022         }
2023         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2024                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2025         if (substream->pcm_release) {
2026                 substream->pcm_release(substream);
2027                 substream->pcm_release = NULL;
2028         }
2029         snd_pcm_detach_substream(substream);
2030 }
2031
2032 EXPORT_SYMBOL(snd_pcm_release_substream);
2033
2034 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2035                            struct file *file,
2036                            struct snd_pcm_substream **rsubstream)
2037 {
2038         struct snd_pcm_substream *substream;
2039         int err;
2040
2041         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2042         if (err < 0)
2043                 return err;
2044         if (substream->ref_count > 1) {
2045                 *rsubstream = substream;
2046                 return 0;
2047         }
2048
2049         err = snd_pcm_hw_constraints_init(substream);
2050         if (err < 0) {
2051                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2052                 goto error;
2053         }
2054
2055         if ((err = substream->ops->open(substream)) < 0)
2056                 goto error;
2057
2058         substream->hw_opened = 1;
2059
2060         err = snd_pcm_hw_constraints_complete(substream);
2061         if (err < 0) {
2062                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2063                 goto error;
2064         }
2065
2066         *rsubstream = substream;
2067         return 0;
2068
2069  error:
2070         snd_pcm_release_substream(substream);
2071         return err;
2072 }
2073
2074 EXPORT_SYMBOL(snd_pcm_open_substream);
2075
2076 static int snd_pcm_open_file(struct file *file,
2077                              struct snd_pcm *pcm,
2078                              int stream)
2079 {
2080         struct snd_pcm_file *pcm_file;
2081         struct snd_pcm_substream *substream;
2082         int err;
2083
2084         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2085         if (err < 0)
2086                 return err;
2087
2088         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2089         if (pcm_file == NULL) {
2090                 snd_pcm_release_substream(substream);
2091                 return -ENOMEM;
2092         }
2093         pcm_file->substream = substream;
2094         if (substream->ref_count == 1) {
2095                 substream->file = pcm_file;
2096                 substream->pcm_release = pcm_release_private;
2097         }
2098         file->private_data = pcm_file;
2099
2100         return 0;
2101 }
2102
2103 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2104 {
2105         struct snd_pcm *pcm;
2106         int err = nonseekable_open(inode, file);
2107         if (err < 0)
2108                 return err;
2109         pcm = snd_lookup_minor_data(iminor(inode),
2110                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2111         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2112 }
2113
2114 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2115 {
2116         struct snd_pcm *pcm;
2117         int err = nonseekable_open(inode, file);
2118         if (err < 0)
2119                 return err;
2120         pcm = snd_lookup_minor_data(iminor(inode),
2121                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2122         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2123 }
2124
2125 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2126 {
2127         int err;
2128         wait_queue_t wait;
2129
2130         if (pcm == NULL) {
2131                 err = -ENODEV;
2132                 goto __error1;
2133         }
2134         err = snd_card_file_add(pcm->card, file);
2135         if (err < 0)
2136                 goto __error1;
2137         if (!try_module_get(pcm->card->module)) {
2138                 err = -EFAULT;
2139                 goto __error2;
2140         }
2141         init_waitqueue_entry(&wait, current);
2142         add_wait_queue(&pcm->open_wait, &wait);
2143         mutex_lock(&pcm->open_mutex);
2144         while (1) {
2145                 err = snd_pcm_open_file(file, pcm, stream);
2146                 if (err >= 0)
2147                         break;
2148                 if (err == -EAGAIN) {
2149                         if (file->f_flags & O_NONBLOCK) {
2150                                 err = -EBUSY;
2151                                 break;
2152                         }
2153                 } else
2154                         break;
2155                 set_current_state(TASK_INTERRUPTIBLE);
2156                 mutex_unlock(&pcm->open_mutex);
2157                 schedule();
2158                 mutex_lock(&pcm->open_mutex);
2159                 if (signal_pending(current)) {
2160                         err = -ERESTARTSYS;
2161                         break;
2162                 }
2163         }
2164         remove_wait_queue(&pcm->open_wait, &wait);
2165         mutex_unlock(&pcm->open_mutex);
2166         if (err < 0)
2167                 goto __error;
2168         return err;
2169
2170       __error:
2171         module_put(pcm->card->module);
2172       __error2:
2173         snd_card_file_remove(pcm->card, file);
2174       __error1:
2175         return err;
2176 }
2177
2178 static int snd_pcm_release(struct inode *inode, struct file *file)
2179 {
2180         struct snd_pcm *pcm;
2181         struct snd_pcm_substream *substream;
2182         struct snd_pcm_file *pcm_file;
2183
2184         pcm_file = file->private_data;
2185         substream = pcm_file->substream;
2186         if (snd_BUG_ON(!substream))
2187                 return -ENXIO;
2188         pcm = substream->pcm;
2189         mutex_lock(&pcm->open_mutex);
2190         snd_pcm_release_substream(substream);
2191         kfree(pcm_file);
2192         mutex_unlock(&pcm->open_mutex);
2193         wake_up(&pcm->open_wait);
2194         module_put(pcm->card->module);
2195         snd_card_file_remove(pcm->card, file);
2196         return 0;
2197 }
2198
2199 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2200                                                  snd_pcm_uframes_t frames)
2201 {
2202         struct snd_pcm_runtime *runtime = substream->runtime;
2203         snd_pcm_sframes_t appl_ptr;
2204         snd_pcm_sframes_t ret;
2205         snd_pcm_sframes_t hw_avail;
2206
2207         if (frames == 0)
2208                 return 0;
2209
2210         snd_pcm_stream_lock_irq(substream);
2211         switch (runtime->status->state) {
2212         case SNDRV_PCM_STATE_PREPARED:
2213                 break;
2214         case SNDRV_PCM_STATE_DRAINING:
2215         case SNDRV_PCM_STATE_RUNNING:
2216                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2217                         break;
2218                 /* Fall through */
2219         case SNDRV_PCM_STATE_XRUN:
2220                 ret = -EPIPE;
2221                 goto __end;
2222         case SNDRV_PCM_STATE_SUSPENDED:
2223                 ret = -ESTRPIPE;
2224                 goto __end;
2225         default:
2226                 ret = -EBADFD;
2227                 goto __end;
2228         }
2229
2230         hw_avail = snd_pcm_playback_hw_avail(runtime);
2231         if (hw_avail <= 0) {
2232                 ret = 0;
2233                 goto __end;
2234         }
2235         if (frames > (snd_pcm_uframes_t)hw_avail)
2236                 frames = hw_avail;
2237         appl_ptr = runtime->control->appl_ptr - frames;
2238         if (appl_ptr < 0)
2239                 appl_ptr += runtime->boundary;
2240         runtime->control->appl_ptr = appl_ptr;
2241         ret = frames;
2242  __end:
2243         snd_pcm_stream_unlock_irq(substream);
2244         return ret;
2245 }
2246
2247 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2248                                                 snd_pcm_uframes_t frames)
2249 {
2250         struct snd_pcm_runtime *runtime = substream->runtime;
2251         snd_pcm_sframes_t appl_ptr;
2252         snd_pcm_sframes_t ret;
2253         snd_pcm_sframes_t hw_avail;
2254
2255         if (frames == 0)
2256                 return 0;
2257
2258         snd_pcm_stream_lock_irq(substream);
2259         switch (runtime->status->state) {
2260         case SNDRV_PCM_STATE_PREPARED:
2261         case SNDRV_PCM_STATE_DRAINING:
2262                 break;
2263         case SNDRV_PCM_STATE_RUNNING:
2264                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2265                         break;
2266                 /* Fall through */
2267         case SNDRV_PCM_STATE_XRUN:
2268                 ret = -EPIPE;
2269                 goto __end;
2270         case SNDRV_PCM_STATE_SUSPENDED:
2271                 ret = -ESTRPIPE;
2272                 goto __end;
2273         default:
2274                 ret = -EBADFD;
2275                 goto __end;
2276         }
2277
2278         hw_avail = snd_pcm_capture_hw_avail(runtime);
2279         if (hw_avail <= 0) {
2280                 ret = 0;
2281                 goto __end;
2282         }
2283         if (frames > (snd_pcm_uframes_t)hw_avail)
2284                 frames = hw_avail;
2285         appl_ptr = runtime->control->appl_ptr - frames;
2286         if (appl_ptr < 0)
2287                 appl_ptr += runtime->boundary;
2288         runtime->control->appl_ptr = appl_ptr;
2289         ret = frames;
2290  __end:
2291         snd_pcm_stream_unlock_irq(substream);
2292         return ret;
2293 }
2294
2295 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2296                                                   snd_pcm_uframes_t frames)
2297 {
2298         struct snd_pcm_runtime *runtime = substream->runtime;
2299         snd_pcm_sframes_t appl_ptr;
2300         snd_pcm_sframes_t ret;
2301         snd_pcm_sframes_t avail;
2302
2303         if (frames == 0)
2304                 return 0;
2305
2306         snd_pcm_stream_lock_irq(substream);
2307         switch (runtime->status->state) {
2308         case SNDRV_PCM_STATE_PREPARED:
2309         case SNDRV_PCM_STATE_PAUSED:
2310                 break;
2311         case SNDRV_PCM_STATE_DRAINING:
2312         case SNDRV_PCM_STATE_RUNNING:
2313                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2314                         break;
2315                 /* Fall through */
2316         case SNDRV_PCM_STATE_XRUN:
2317                 ret = -EPIPE;
2318                 goto __end;
2319         case SNDRV_PCM_STATE_SUSPENDED:
2320                 ret = -ESTRPIPE;
2321                 goto __end;
2322         default:
2323                 ret = -EBADFD;
2324                 goto __end;
2325         }
2326
2327         avail = snd_pcm_playback_avail(runtime);
2328         if (avail <= 0) {
2329                 ret = 0;
2330                 goto __end;
2331         }
2332         if (frames > (snd_pcm_uframes_t)avail)
2333                 frames = avail;
2334         appl_ptr = runtime->control->appl_ptr + frames;
2335         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2336                 appl_ptr -= runtime->boundary;
2337         runtime->control->appl_ptr = appl_ptr;
2338         ret = frames;
2339  __end:
2340         snd_pcm_stream_unlock_irq(substream);
2341         return ret;
2342 }
2343
2344 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2345                                                  snd_pcm_uframes_t frames)
2346 {
2347         struct snd_pcm_runtime *runtime = substream->runtime;
2348         snd_pcm_sframes_t appl_ptr;
2349         snd_pcm_sframes_t ret;
2350         snd_pcm_sframes_t avail;
2351
2352         if (frames == 0)
2353                 return 0;
2354
2355         snd_pcm_stream_lock_irq(substream);
2356         switch (runtime->status->state) {
2357         case SNDRV_PCM_STATE_PREPARED:
2358         case SNDRV_PCM_STATE_DRAINING:
2359         case SNDRV_PCM_STATE_PAUSED:
2360                 break;
2361         case SNDRV_PCM_STATE_RUNNING:
2362                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2363                         break;
2364                 /* Fall through */
2365         case SNDRV_PCM_STATE_XRUN:
2366                 ret = -EPIPE;
2367                 goto __end;
2368         case SNDRV_PCM_STATE_SUSPENDED:
2369                 ret = -ESTRPIPE;
2370                 goto __end;
2371         default:
2372                 ret = -EBADFD;
2373                 goto __end;
2374         }
2375
2376         avail = snd_pcm_capture_avail(runtime);
2377         if (avail <= 0) {
2378                 ret = 0;
2379                 goto __end;
2380         }
2381         if (frames > (snd_pcm_uframes_t)avail)
2382                 frames = avail;
2383         appl_ptr = runtime->control->appl_ptr + frames;
2384         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2385                 appl_ptr -= runtime->boundary;
2386         runtime->control->appl_ptr = appl_ptr;
2387         ret = frames;
2388  __end:
2389         snd_pcm_stream_unlock_irq(substream);
2390         return ret;
2391 }
2392
2393 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2394 {
2395         struct snd_pcm_runtime *runtime = substream->runtime;
2396         int err;
2397
2398         snd_pcm_stream_lock_irq(substream);
2399         switch (runtime->status->state) {
2400         case SNDRV_PCM_STATE_DRAINING:
2401                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2402                         goto __badfd;
2403         case SNDRV_PCM_STATE_RUNNING:
2404                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2405                         break;
2406                 /* Fall through */
2407         case SNDRV_PCM_STATE_PREPARED:
2408         case SNDRV_PCM_STATE_SUSPENDED:
2409                 err = 0;
2410                 break;
2411         case SNDRV_PCM_STATE_XRUN:
2412                 err = -EPIPE;
2413                 break;
2414         default:
2415               __badfd:
2416                 err = -EBADFD;
2417                 break;
2418         }
2419         snd_pcm_stream_unlock_irq(substream);
2420         return err;
2421 }
2422
2423 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2424                          snd_pcm_sframes_t __user *res)
2425 {
2426         struct snd_pcm_runtime *runtime = substream->runtime;
2427         int err;
2428         snd_pcm_sframes_t n = 0;
2429
2430         snd_pcm_stream_lock_irq(substream);
2431         switch (runtime->status->state) {
2432         case SNDRV_PCM_STATE_DRAINING:
2433                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2434                         goto __badfd;
2435         case SNDRV_PCM_STATE_RUNNING:
2436                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2437                         break;
2438                 /* Fall through */
2439         case SNDRV_PCM_STATE_PREPARED:
2440         case SNDRV_PCM_STATE_SUSPENDED:
2441                 err = 0;
2442                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2443                         n = snd_pcm_playback_hw_avail(runtime);
2444                 else
2445                         n = snd_pcm_capture_avail(runtime);
2446                 n += runtime->delay;
2447                 break;
2448         case SNDRV_PCM_STATE_XRUN:
2449                 err = -EPIPE;
2450                 break;
2451         default:
2452               __badfd:
2453                 err = -EBADFD;
2454                 break;
2455         }
2456         snd_pcm_stream_unlock_irq(substream);
2457         if (!err)
2458                 if (put_user(n, res))
2459                         err = -EFAULT;
2460         return err;
2461 }
2462
2463 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2464                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2465 {
2466         struct snd_pcm_runtime *runtime = substream->runtime;
2467         struct snd_pcm_sync_ptr sync_ptr;
2468         volatile struct snd_pcm_mmap_status *status;
2469         volatile struct snd_pcm_mmap_control *control;
2470         int err;
2471
2472         memset(&sync_ptr, 0, sizeof(sync_ptr));
2473         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2474                 return -EFAULT;
2475         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2476                 return -EFAULT;
2477         status = runtime->status;
2478         control = runtime->control;
2479         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2480                 err = snd_pcm_hwsync(substream);
2481                 if (err < 0)
2482                         return err;
2483         }
2484         snd_pcm_stream_lock_irq(substream);
2485         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2486                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2487         else
2488                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2489         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2490                 control->avail_min = sync_ptr.c.control.avail_min;
2491         else
2492                 sync_ptr.c.control.avail_min = control->avail_min;
2493         sync_ptr.s.status.state = status->state;
2494         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2495         sync_ptr.s.status.tstamp = status->tstamp;
2496         sync_ptr.s.status.suspended_state = status->suspended_state;
2497         snd_pcm_stream_unlock_irq(substream);
2498         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2499                 return -EFAULT;
2500         return 0;
2501 }
2502
2503 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2504 {
2505         struct snd_pcm_runtime *runtime = substream->runtime;
2506         int arg;
2507
2508         if (get_user(arg, _arg))
2509                 return -EFAULT;
2510         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2511                 return -EINVAL;
2512         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2513         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2514                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2515         return 0;
2516 }
2517
2518 static int snd_pcm_common_ioctl1(struct file *file,
2519                                  struct snd_pcm_substream *substream,
2520                                  unsigned int cmd, void __user *arg)
2521 {
2522         switch (cmd) {
2523         case SNDRV_PCM_IOCTL_PVERSION:
2524                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2525         case SNDRV_PCM_IOCTL_INFO:
2526                 return snd_pcm_info_user(substream, arg);
2527         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2528                 return 0;
2529         case SNDRV_PCM_IOCTL_TTSTAMP:
2530                 return snd_pcm_tstamp(substream, arg);
2531         case SNDRV_PCM_IOCTL_HW_REFINE:
2532                 return snd_pcm_hw_refine_user(substream, arg);
2533         case SNDRV_PCM_IOCTL_HW_PARAMS:
2534                 return snd_pcm_hw_params_user(substream, arg);
2535         case SNDRV_PCM_IOCTL_HW_FREE:
2536                 return snd_pcm_hw_free(substream);
2537         case SNDRV_PCM_IOCTL_SW_PARAMS:
2538                 return snd_pcm_sw_params_user(substream, arg);
2539         case SNDRV_PCM_IOCTL_STATUS:
2540                 return snd_pcm_status_user(substream, arg);
2541         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2542                 return snd_pcm_channel_info_user(substream, arg);
2543         case SNDRV_PCM_IOCTL_PREPARE:
2544                 return snd_pcm_prepare(substream, file);
2545         case SNDRV_PCM_IOCTL_RESET:
2546                 return snd_pcm_reset(substream);
2547         case SNDRV_PCM_IOCTL_START:
2548                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2549         case SNDRV_PCM_IOCTL_LINK:
2550                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2551         case SNDRV_PCM_IOCTL_UNLINK:
2552                 return snd_pcm_unlink(substream);
2553         case SNDRV_PCM_IOCTL_RESUME:
2554                 return snd_pcm_resume(substream);
2555         case SNDRV_PCM_IOCTL_XRUN:
2556                 return snd_pcm_xrun(substream);
2557         case SNDRV_PCM_IOCTL_HWSYNC:
2558                 return snd_pcm_hwsync(substream);
2559         case SNDRV_PCM_IOCTL_DELAY:
2560                 return snd_pcm_delay(substream, arg);
2561         case SNDRV_PCM_IOCTL_SYNC_PTR:
2562                 return snd_pcm_sync_ptr(substream, arg);
2563 #ifdef CONFIG_SND_SUPPORT_OLD_API
2564         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2565                 return snd_pcm_hw_refine_old_user(substream, arg);
2566         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2567                 return snd_pcm_hw_params_old_user(substream, arg);
2568 #endif
2569         case SNDRV_PCM_IOCTL_DRAIN:
2570                 return snd_pcm_drain(substream, file);
2571         case SNDRV_PCM_IOCTL_DROP:
2572                 return snd_pcm_drop(substream);
2573         case SNDRV_PCM_IOCTL_PAUSE:
2574         {
2575                 int res;
2576                 snd_pcm_stream_lock_irq(substream);
2577                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2578                 snd_pcm_stream_unlock_irq(substream);
2579                 return res;
2580         }
2581         }
2582         snd_printd("unknown ioctl = 0x%x\n", cmd);
2583         return -ENOTTY;
2584 }
2585
2586 static int snd_pcm_playback_ioctl1(struct file *file,
2587                                    struct snd_pcm_substream *substream,
2588                                    unsigned int cmd, void __user *arg)
2589 {
2590         if (snd_BUG_ON(!substream))
2591                 return -ENXIO;
2592         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2593                 return -EINVAL;
2594         switch (cmd) {
2595         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2596         {
2597                 struct snd_xferi xferi;
2598                 struct snd_xferi __user *_xferi = arg;
2599                 struct snd_pcm_runtime *runtime = substream->runtime;
2600                 snd_pcm_sframes_t result;
2601                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2602                         return -EBADFD;
2603                 if (put_user(0, &_xferi->result))
2604                         return -EFAULT;
2605                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2606                         return -EFAULT;
2607                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2608                 __put_user(result, &_xferi->result);
2609                 return result < 0 ? result : 0;
2610         }
2611         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2612         {
2613                 struct snd_xfern xfern;
2614                 struct snd_xfern __user *_xfern = arg;
2615                 struct snd_pcm_runtime *runtime = substream->runtime;
2616                 void __user **bufs;
2617                 snd_pcm_sframes_t result;
2618                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2619                         return -EBADFD;
2620                 if (runtime->channels > 128)
2621                         return -EINVAL;
2622                 if (put_user(0, &_xfern->result))
2623                         return -EFAULT;
2624                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2625                         return -EFAULT;
2626
2627                 bufs = memdup_user(xfern.bufs,
2628                                    sizeof(void *) * runtime->channels);
2629                 if (IS_ERR(bufs))
2630                         return PTR_ERR(bufs);
2631                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2632                 kfree(bufs);
2633                 __put_user(result, &_xfern->result);
2634                 return result < 0 ? result : 0;
2635         }
2636         case SNDRV_PCM_IOCTL_REWIND:
2637         {
2638                 snd_pcm_uframes_t frames;
2639                 snd_pcm_uframes_t __user *_frames = arg;
2640                 snd_pcm_sframes_t result;
2641                 if (get_user(frames, _frames))
2642                         return -EFAULT;
2643                 if (put_user(0, _frames))
2644                         return -EFAULT;
2645                 result = snd_pcm_playback_rewind(substream, frames);
2646                 __put_user(result, _frames);
2647                 return result < 0 ? result : 0;
2648         }
2649         case SNDRV_PCM_IOCTL_FORWARD:
2650         {
2651                 snd_pcm_uframes_t frames;
2652                 snd_pcm_uframes_t __user *_frames = arg;
2653                 snd_pcm_sframes_t result;
2654                 if (get_user(frames, _frames))
2655                         return -EFAULT;
2656                 if (put_user(0, _frames))
2657                         return -EFAULT;
2658                 result = snd_pcm_playback_forward(substream, frames);
2659                 __put_user(result, _frames);
2660                 return result < 0 ? result : 0;
2661         }
2662         }
2663         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2664 }
2665
2666 static int snd_pcm_capture_ioctl1(struct file *file,
2667                                   struct snd_pcm_substream *substream,
2668                                   unsigned int cmd, void __user *arg)
2669 {
2670         if (snd_BUG_ON(!substream))
2671                 return -ENXIO;
2672         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2673                 return -EINVAL;
2674         switch (cmd) {
2675         case SNDRV_PCM_IOCTL_READI_FRAMES:
2676         {
2677                 struct snd_xferi xferi;
2678                 struct snd_xferi __user *_xferi = arg;
2679                 struct snd_pcm_runtime *runtime = substream->runtime;
2680                 snd_pcm_sframes_t result;
2681                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2682                         return -EBADFD;
2683                 if (put_user(0, &_xferi->result))
2684                         return -EFAULT;
2685                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2686                         return -EFAULT;
2687                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2688                 __put_user(result, &_xferi->result);
2689                 return result < 0 ? result : 0;
2690         }
2691         case SNDRV_PCM_IOCTL_READN_FRAMES:
2692         {
2693                 struct snd_xfern xfern;
2694                 struct snd_xfern __user *_xfern = arg;
2695                 struct snd_pcm_runtime *runtime = substream->runtime;
2696                 void *bufs;
2697                 snd_pcm_sframes_t result;
2698                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2699                         return -EBADFD;
2700                 if (runtime->channels > 128)
2701                         return -EINVAL;
2702                 if (put_user(0, &_xfern->result))
2703                         return -EFAULT;
2704                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2705                         return -EFAULT;
2706
2707                 bufs = memdup_user(xfern.bufs,
2708                                    sizeof(void *) * runtime->channels);
2709                 if (IS_ERR(bufs))
2710                         return PTR_ERR(bufs);
2711                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2712                 kfree(bufs);
2713                 __put_user(result, &_xfern->result);
2714                 return result < 0 ? result : 0;
2715         }
2716         case SNDRV_PCM_IOCTL_REWIND:
2717         {
2718                 snd_pcm_uframes_t frames;
2719                 snd_pcm_uframes_t __user *_frames = arg;
2720                 snd_pcm_sframes_t result;
2721                 if (get_user(frames, _frames))
2722                         return -EFAULT;
2723                 if (put_user(0, _frames))
2724                         return -EFAULT;
2725                 result = snd_pcm_capture_rewind(substream, frames);
2726                 __put_user(result, _frames);
2727                 return result < 0 ? result : 0;
2728         }
2729         case SNDRV_PCM_IOCTL_FORWARD:
2730         {
2731                 snd_pcm_uframes_t frames;
2732                 snd_pcm_uframes_t __user *_frames = arg;
2733                 snd_pcm_sframes_t result;
2734                 if (get_user(frames, _frames))
2735                         return -EFAULT;
2736                 if (put_user(0, _frames))
2737                         return -EFAULT;
2738                 result = snd_pcm_capture_forward(substream, frames);
2739                 __put_user(result, _frames);
2740                 return result < 0 ? result : 0;
2741         }
2742         }
2743         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2744 }
2745
2746 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2747                                    unsigned long arg)
2748 {
2749         struct snd_pcm_file *pcm_file;
2750
2751         pcm_file = file->private_data;
2752
2753         if (((cmd >> 8) & 0xff) != 'A')
2754                 return -ENOTTY;
2755
2756         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2757                                        (void __user *)arg);
2758 }
2759
2760 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2761                                   unsigned long arg)
2762 {
2763         struct snd_pcm_file *pcm_file;
2764
2765         pcm_file = file->private_data;
2766
2767         if (((cmd >> 8) & 0xff) != 'A')
2768                 return -ENOTTY;
2769
2770         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2771                                       (void __user *)arg);
2772 }
2773
2774 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2775                          unsigned int cmd, void *arg)
2776 {
2777         mm_segment_t fs;
2778         int result;
2779
2780         fs = snd_enter_user();
2781         switch (substream->stream) {
2782         case SNDRV_PCM_STREAM_PLAYBACK:
2783                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2784                                                  (void __user *)arg);
2785                 break;
2786         case SNDRV_PCM_STREAM_CAPTURE:
2787                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2788                                                 (void __user *)arg);
2789                 break;
2790         default:
2791                 result = -EINVAL;
2792                 break;
2793         }
2794         snd_leave_user(fs);
2795         return result;
2796 }
2797
2798 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2799
2800 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2801                             loff_t * offset)
2802 {
2803         struct snd_pcm_file *pcm_file;
2804         struct snd_pcm_substream *substream;
2805         struct snd_pcm_runtime *runtime;
2806         snd_pcm_sframes_t result;
2807
2808         pcm_file = file->private_data;
2809         substream = pcm_file->substream;
2810         if (PCM_RUNTIME_CHECK(substream))
2811                 return -ENXIO;
2812         runtime = substream->runtime;
2813         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2814                 return -EBADFD;
2815         if (!frame_aligned(runtime, count))
2816                 return -EINVAL;
2817         count = bytes_to_frames(runtime, count);
2818         result = snd_pcm_lib_read(substream, buf, count);
2819         if (result > 0)
2820                 result = frames_to_bytes(runtime, result);
2821         return result;
2822 }
2823
2824 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2825                              size_t count, loff_t * offset)
2826 {
2827         struct snd_pcm_file *pcm_file;
2828         struct snd_pcm_substream *substream;
2829         struct snd_pcm_runtime *runtime;
2830         snd_pcm_sframes_t result;
2831
2832         pcm_file = file->private_data;
2833         substream = pcm_file->substream;
2834         if (PCM_RUNTIME_CHECK(substream))
2835                 return -ENXIO;
2836         runtime = substream->runtime;
2837         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2838                 return -EBADFD;
2839         if (!frame_aligned(runtime, count))
2840                 return -EINVAL;
2841         count = bytes_to_frames(runtime, count);
2842         result = snd_pcm_lib_write(substream, buf, count);
2843         if (result > 0)
2844                 result = frames_to_bytes(runtime, result);
2845         return result;
2846 }
2847
2848 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2849                              unsigned long nr_segs, loff_t pos)
2850
2851 {
2852         struct snd_pcm_file *pcm_file;
2853         struct snd_pcm_substream *substream;
2854         struct snd_pcm_runtime *runtime;
2855         snd_pcm_sframes_t result;
2856         unsigned long i;
2857         void __user **bufs;
2858         snd_pcm_uframes_t frames;
2859
2860         pcm_file = iocb->ki_filp->private_data;
2861         substream = pcm_file->substream;
2862         if (PCM_RUNTIME_CHECK(substream))
2863                 return -ENXIO;
2864         runtime = substream->runtime;
2865         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2866                 return -EBADFD;
2867         if (nr_segs > 1024 || nr_segs != runtime->channels)
2868                 return -EINVAL;
2869         if (!frame_aligned(runtime, iov->iov_len))
2870                 return -EINVAL;
2871         frames = bytes_to_samples(runtime, iov->iov_len);
2872         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2873         if (bufs == NULL)
2874                 return -ENOMEM;
2875         for (i = 0; i < nr_segs; ++i)
2876                 bufs[i] = iov[i].iov_base;
2877         result = snd_pcm_lib_readv(substream, bufs, frames);
2878         if (result > 0)
2879                 result = frames_to_bytes(runtime, result);
2880         kfree(bufs);
2881         return result;
2882 }
2883
2884 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2885                               unsigned long nr_segs, loff_t pos)
2886 {
2887         struct snd_pcm_file *pcm_file;
2888         struct snd_pcm_substream *substream;
2889         struct snd_pcm_runtime *runtime;
2890         snd_pcm_sframes_t result;
2891         unsigned long i;
2892         void __user **bufs;
2893         snd_pcm_uframes_t frames;
2894
2895         pcm_file = iocb->ki_filp->private_data;
2896         substream = pcm_file->substream;
2897         if (PCM_RUNTIME_CHECK(substream))
2898                 return -ENXIO;
2899         runtime = substream->runtime;
2900         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2901                 return -EBADFD;
2902         if (nr_segs > 128 || nr_segs != runtime->channels ||
2903             !frame_aligned(runtime, iov->iov_len))
2904                 return -EINVAL;
2905         frames = bytes_to_samples(runtime, iov->iov_len);
2906         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2907         if (bufs == NULL)
2908                 return -ENOMEM;
2909         for (i = 0; i < nr_segs; ++i)
2910                 bufs[i] = iov[i].iov_base;
2911         result = snd_pcm_lib_writev(substream, bufs, frames);
2912         if (result > 0)
2913                 result = frames_to_bytes(runtime, result);
2914         kfree(bufs);
2915         return result;
2916 }
2917
2918 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2919 {
2920         struct snd_pcm_file *pcm_file;
2921         struct snd_pcm_substream *substream;
2922         struct snd_pcm_runtime *runtime;
2923         unsigned int mask;
2924         snd_pcm_uframes_t avail;
2925
2926         pcm_file = file->private_data;
2927
2928         substream = pcm_file->substream;
2929         if (PCM_RUNTIME_CHECK(substream))
2930                 return -ENXIO;
2931         runtime = substream->runtime;
2932
2933         poll_wait(file, &runtime->sleep, wait);
2934
2935         snd_pcm_stream_lock_irq(substream);
2936         avail = snd_pcm_playback_avail(runtime);
2937         switch (runtime->status->state) {
2938         case SNDRV_PCM_STATE_RUNNING:
2939         case SNDRV_PCM_STATE_PREPARED:
2940         case SNDRV_PCM_STATE_PAUSED:
2941                 if (avail >= runtime->control->avail_min) {
2942                         mask = POLLOUT | POLLWRNORM;
2943                         break;
2944                 }
2945                 /* Fall through */
2946         case SNDRV_PCM_STATE_DRAINING:
2947                 mask = 0;
2948                 break;
2949         default:
2950                 mask = POLLOUT | POLLWRNORM | POLLERR;
2951                 break;
2952         }
2953         snd_pcm_stream_unlock_irq(substream);
2954         return mask;
2955 }
2956
2957 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2958 {
2959         struct snd_pcm_file *pcm_file;
2960         struct snd_pcm_substream *substream;
2961         struct snd_pcm_runtime *runtime;
2962         unsigned int mask;
2963         snd_pcm_uframes_t avail;
2964
2965         pcm_file = file->private_data;
2966
2967         substream = pcm_file->substream;
2968         if (PCM_RUNTIME_CHECK(substream))
2969                 return -ENXIO;
2970         runtime = substream->runtime;
2971
2972         poll_wait(file, &runtime->sleep, wait);
2973
2974         snd_pcm_stream_lock_irq(substream);
2975         avail = snd_pcm_capture_avail(runtime);
2976         switch (runtime->status->state) {
2977         case SNDRV_PCM_STATE_RUNNING:
2978         case SNDRV_PCM_STATE_PREPARED:
2979         case SNDRV_PCM_STATE_PAUSED:
2980                 if (avail >= runtime->control->avail_min) {
2981                         mask = POLLIN | POLLRDNORM;
2982                         break;
2983                 }
2984                 mask = 0;
2985                 break;
2986         case SNDRV_PCM_STATE_DRAINING:
2987                 if (avail > 0) {
2988                         mask = POLLIN | POLLRDNORM;
2989                         break;
2990                 }
2991                 /* Fall through */
2992         default:
2993                 mask = POLLIN | POLLRDNORM | POLLERR;
2994                 break;
2995         }
2996         snd_pcm_stream_unlock_irq(substream);
2997         return mask;
2998 }
2999
3000 /*
3001  * mmap support
3002  */
3003
3004 /*
3005  * Only on coherent architectures, we can mmap the status and the control records
3006  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3007  */
3008 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3009 /*
3010  * mmap status record
3011  */
3012 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3013                                                 struct vm_fault *vmf)
3014 {
3015         struct snd_pcm_substream *substream = area->vm_private_data;
3016         struct snd_pcm_runtime *runtime;
3017
3018         if (substream == NULL)
3019                 return VM_FAULT_SIGBUS;
3020         runtime = substream->runtime;
3021         vmf->page = virt_to_page(runtime->status);
3022         get_page(vmf->page);
3023         return 0;
3024 }
3025
3026 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3027 {
3028         .fault =        snd_pcm_mmap_status_fault,
3029 };
3030
3031 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3032                                struct vm_area_struct *area)
3033 {
3034         long size;
3035         if (!(area->vm_flags & VM_READ))
3036                 return -EINVAL;
3037         size = area->vm_end - area->vm_start;
3038         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3039                 return -EINVAL;
3040         area->vm_ops = &snd_pcm_vm_ops_status;
3041         area->vm_private_data = substream;
3042         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3043         return 0;
3044 }
3045
3046 /*
3047  * mmap control record
3048  */
3049 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3050                                                 struct vm_fault *vmf)
3051 {
3052         struct snd_pcm_substream *substream = area->vm_private_data;
3053         struct snd_pcm_runtime *runtime;
3054
3055         if (substream == NULL)
3056                 return VM_FAULT_SIGBUS;
3057         runtime = substream->runtime;
3058         vmf->page = virt_to_page(runtime->control);
3059         get_page(vmf->page);
3060         return 0;
3061 }
3062
3063 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3064 {
3065         .fault =        snd_pcm_mmap_control_fault,
3066 };
3067
3068 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3069                                 struct vm_area_struct *area)
3070 {
3071         long size;
3072         if (!(area->vm_flags & VM_READ))
3073                 return -EINVAL;
3074         size = area->vm_end - area->vm_start;
3075         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3076                 return -EINVAL;
3077         area->vm_ops = &snd_pcm_vm_ops_control;
3078         area->vm_private_data = substream;
3079         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3080         return 0;
3081 }
3082 #else /* ! coherent mmap */
3083 /*
3084  * don't support mmap for status and control records.
3085  */
3086 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3087                                struct vm_area_struct *area)
3088 {
3089         return -ENXIO;
3090 }
3091 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3092                                 struct vm_area_struct *area)
3093 {
3094         return -ENXIO;
3095 }
3096 #endif /* coherent mmap */
3097
3098 static inline struct page *
3099 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3100 {
3101         void *vaddr = substream->runtime->dma_area + ofs;
3102 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3103         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3104                 return virt_to_page(CAC_ADDR(vaddr));
3105 #endif
3106 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3107         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3108                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3109                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3110                 /* assume dma_handle set via pfn_to_phys() in
3111                  * mm/dma-noncoherent.c
3112                  */
3113                 return pfn_to_page(addr >> PAGE_SHIFT);
3114         }
3115 #endif
3116         return virt_to_page(vaddr);
3117 }
3118
3119 /*
3120  * fault callback for mmapping a RAM page
3121  */
3122 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3123                                                 struct vm_fault *vmf)
3124 {
3125         struct snd_pcm_substream *substream = area->vm_private_data;
3126         struct snd_pcm_runtime *runtime;
3127         unsigned long offset;
3128         struct page * page;
3129         size_t dma_bytes;
3130
3131         if (substream == NULL)
3132                 return VM_FAULT_SIGBUS;
3133         runtime = substream->runtime;
3134         offset = vmf->pgoff << PAGE_SHIFT;
3135         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3136         if (offset > dma_bytes - PAGE_SIZE)
3137                 return VM_FAULT_SIGBUS;
3138         if (substream->ops->page)
3139                 page = substream->ops->page(substream, offset);
3140         else
3141                 page = snd_pcm_default_page_ops(substream, offset);
3142         if (!page)
3143                 return VM_FAULT_SIGBUS;
3144         get_page(page);
3145         vmf->page = page;
3146         return 0;
3147 }
3148
3149 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3150         .open =         snd_pcm_mmap_data_open,
3151         .close =        snd_pcm_mmap_data_close,
3152 };
3153
3154 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3155         .open =         snd_pcm_mmap_data_open,
3156         .close =        snd_pcm_mmap_data_close,
3157         .fault =        snd_pcm_mmap_data_fault,
3158 };
3159
3160 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3161 /* This should be defined / handled globally! */
3162 #ifdef CONFIG_ARM
3163 #define ARCH_HAS_DMA_MMAP_COHERENT
3164 #endif
3165 #endif
3166
3167 /*
3168  * mmap the DMA buffer on RAM
3169  */
3170 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3171                              struct vm_area_struct *area)
3172 {
3173         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3174 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3175         if (!substream->ops->page &&
3176             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3177                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3178                                          area,
3179                                          substream->runtime->dma_area,
3180                                          substream->runtime->dma_addr,
3181                                          area->vm_end - area->vm_start);
3182 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3183         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3184             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3185                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3186 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3187         /* mmap with fault handler */
3188         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3189         return 0;
3190 }
3191 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3192
3193 /*
3194  * mmap the DMA buffer on I/O memory area
3195  */
3196 #if SNDRV_PCM_INFO_MMAP_IOMEM
3197 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3198                            struct vm_area_struct *area)
3199 {
3200         long size;
3201         unsigned long offset;
3202
3203         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3204         area->vm_flags |= VM_IO;
3205         size = area->vm_end - area->vm_start;
3206         offset = area->vm_pgoff << PAGE_SHIFT;
3207         if (io_remap_pfn_range(area, area->vm_start,
3208                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3209                                 size, area->vm_page_prot))
3210                 return -EAGAIN;
3211         return 0;
3212 }
3213
3214 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3215 #endif /* SNDRV_PCM_INFO_MMAP */
3216
3217 /*
3218  * mmap DMA buffer
3219  */
3220 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3221                       struct vm_area_struct *area)
3222 {
3223         struct snd_pcm_runtime *runtime;
3224         long size;
3225         unsigned long offset;
3226         size_t dma_bytes;
3227         int err;
3228
3229         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3230                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3231                         return -EINVAL;
3232         } else {
3233                 if (!(area->vm_flags & VM_READ))
3234                         return -EINVAL;
3235         }
3236         runtime = substream->runtime;
3237         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3238                 return -EBADFD;
3239         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3240                 return -ENXIO;
3241         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3242             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3243                 return -EINVAL;
3244         size = area->vm_end - area->vm_start;
3245         offset = area->vm_pgoff << PAGE_SHIFT;
3246         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3247         if ((size_t)size > dma_bytes)
3248                 return -EINVAL;
3249         if (offset > dma_bytes - size)
3250                 return -EINVAL;
3251
3252         area->vm_ops = &snd_pcm_vm_ops_data;
3253         area->vm_private_data = substream;
3254         if (substream->ops->mmap)
3255                 err = substream->ops->mmap(substream, area);
3256         else
3257                 err = snd_pcm_lib_default_mmap(substream, area);
3258         if (!err)
3259                 atomic_inc(&substream->mmap_count);
3260         return err;
3261 }
3262
3263 EXPORT_SYMBOL(snd_pcm_mmap_data);
3264
3265 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3266 {
3267         struct snd_pcm_file * pcm_file;
3268         struct snd_pcm_substream *substream;
3269         unsigned long offset;
3270
3271         pcm_file = file->private_data;
3272         substream = pcm_file->substream;
3273         if (PCM_RUNTIME_CHECK(substream))
3274                 return -ENXIO;
3275
3276         offset = area->vm_pgoff << PAGE_SHIFT;
3277         switch (offset) {
3278         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3279                 if (pcm_file->no_compat_mmap)
3280                         return -ENXIO;
3281                 return snd_pcm_mmap_status(substream, file, area);
3282         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3283                 if (pcm_file->no_compat_mmap)
3284                         return -ENXIO;
3285                 return snd_pcm_mmap_control(substream, file, area);
3286         default:
3287                 return snd_pcm_mmap_data(substream, file, area);
3288         }
3289         return 0;
3290 }
3291
3292 static int snd_pcm_fasync(int fd, struct file * file, int on)
3293 {
3294         struct snd_pcm_file * pcm_file;
3295         struct snd_pcm_substream *substream;
3296         struct snd_pcm_runtime *runtime;
3297
3298         pcm_file = file->private_data;
3299         substream = pcm_file->substream;
3300         if (PCM_RUNTIME_CHECK(substream))
3301                 return -ENXIO;
3302         runtime = substream->runtime;
3303         return fasync_helper(fd, file, on, &runtime->fasync);
3304 }
3305
3306 /*
3307  * ioctl32 compat
3308  */
3309 #ifdef CONFIG_COMPAT
3310 #include "pcm_compat.c"
3311 #else
3312 #define snd_pcm_ioctl_compat    NULL
3313 #endif
3314
3315 /*
3316  *  To be removed helpers to keep binary compatibility
3317  */
3318
3319 #ifdef CONFIG_SND_SUPPORT_OLD_API
3320 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3321 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3322
3323 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3324                                                struct snd_pcm_hw_params_old *oparams)
3325 {
3326         unsigned int i;
3327
3328         memset(params, 0, sizeof(*params));
3329         params->flags = oparams->flags;
3330         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3331                 params->masks[i].bits[0] = oparams->masks[i];
3332         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3333         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3334         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3335         params->info = oparams->info;
3336         params->msbits = oparams->msbits;
3337         params->rate_num = oparams->rate_num;
3338         params->rate_den = oparams->rate_den;
3339         params->fifo_size = oparams->fifo_size;
3340 }
3341
3342 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3343                                              struct snd_pcm_hw_params *params)
3344 {
3345         unsigned int i;
3346
3347         memset(oparams, 0, sizeof(*oparams));
3348         oparams->flags = params->flags;
3349         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3350                 oparams->masks[i] = params->masks[i].bits[0];
3351         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3352         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3353         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3354         oparams->info = params->info;
3355         oparams->msbits = params->msbits;
3356         oparams->rate_num = params->rate_num;
3357         oparams->rate_den = params->rate_den;
3358         oparams->fifo_size = params->fifo_size;
3359 }
3360
3361 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3362                                       struct snd_pcm_hw_params_old __user * _oparams)
3363 {
3364         struct snd_pcm_hw_params *params;
3365         struct snd_pcm_hw_params_old *oparams = NULL;
3366         int err;
3367
3368         params = kmalloc(sizeof(*params), GFP_KERNEL);
3369         if (!params)
3370                 return -ENOMEM;
3371
3372         oparams = memdup_user(_oparams, sizeof(*oparams));
3373         if (IS_ERR(oparams)) {
3374                 err = PTR_ERR(oparams);
3375                 goto out;
3376         }
3377         snd_pcm_hw_convert_from_old_params(params, oparams);
3378         err = snd_pcm_hw_refine(substream, params);
3379         snd_pcm_hw_convert_to_old_params(oparams, params);
3380         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3381                 if (!err)
3382                         err = -EFAULT;
3383         }
3384
3385         kfree(oparams);
3386 out:
3387         kfree(params);
3388         return err;
3389 }
3390
3391 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3392                                       struct snd_pcm_hw_params_old __user * _oparams)
3393 {
3394         struct snd_pcm_hw_params *params;
3395         struct snd_pcm_hw_params_old *oparams = NULL;
3396         int err;
3397
3398         params = kmalloc(sizeof(*params), GFP_KERNEL);
3399         if (!params)
3400                 return -ENOMEM;
3401
3402         oparams = memdup_user(_oparams, sizeof(*oparams));
3403         if (IS_ERR(oparams)) {
3404                 err = PTR_ERR(oparams);
3405                 goto out;
3406         }
3407         snd_pcm_hw_convert_from_old_params(params, oparams);
3408         err = snd_pcm_hw_params(substream, params);
3409         snd_pcm_hw_convert_to_old_params(oparams, params);
3410         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3411                 if (!err)
3412                         err = -EFAULT;
3413         }
3414
3415         kfree(oparams);
3416 out:
3417         kfree(params);
3418         return err;
3419 }
3420 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3421
3422 #ifndef CONFIG_MMU
3423 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3424                                                unsigned long addr,
3425                                                unsigned long len,
3426                                                unsigned long pgoff,
3427                                                unsigned long flags)
3428 {
3429         struct snd_pcm_file *pcm_file = file->private_data;
3430         struct snd_pcm_substream *substream = pcm_file->substream;
3431         struct snd_pcm_runtime *runtime = substream->runtime;
3432         unsigned long offset = pgoff << PAGE_SHIFT;
3433
3434         switch (offset) {
3435         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3436                 return (unsigned long)runtime->status;
3437         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3438                 return (unsigned long)runtime->control;
3439         default:
3440                 return (unsigned long)runtime->dma_area + offset;
3441         }
3442 }
3443 #else
3444 # define snd_pcm_get_unmapped_area NULL
3445 #endif
3446
3447 /*
3448  *  Register section
3449  */
3450
3451 const struct file_operations snd_pcm_f_ops[2] = {
3452         {
3453                 .owner =                THIS_MODULE,
3454                 .write =                snd_pcm_write,
3455                 .aio_write =            snd_pcm_aio_write,
3456                 .open =                 snd_pcm_playback_open,
3457                 .release =              snd_pcm_release,
3458                 .llseek =               no_llseek,
3459                 .poll =                 snd_pcm_playback_poll,
3460                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3461                 .compat_ioctl =         snd_pcm_ioctl_compat,
3462                 .mmap =                 snd_pcm_mmap,
3463                 .fasync =               snd_pcm_fasync,
3464                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3465         },
3466         {
3467                 .owner =                THIS_MODULE,
3468                 .read =                 snd_pcm_read,
3469                 .aio_read =             snd_pcm_aio_read,
3470                 .open =                 snd_pcm_capture_open,
3471                 .release =              snd_pcm_release,
3472                 .llseek =               no_llseek,
3473                 .poll =                 snd_pcm_capture_poll,
3474                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3475                 .compat_ioctl =         snd_pcm_ioctl_compat,
3476                 .mmap =                 snd_pcm_mmap,
3477                 .fasync =               snd_pcm_fasync,
3478                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3479         }
3480 };