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/aio.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                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
 194                 pr_cont("%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                 pr_cont("%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                 pr_debug("%s = ", snd_pcm_hw_param_names[k]);
 214                 if (i->empty)
 215                         pr_cont("empty");
 216                 else
 217                         pr_cont("%c%u %u%c",
 218                                i->openmin ? '(' : '[', i->min,
 219                                i->max, i->openmax ? ')' : ']');
 220                 pr_cont(" -> ");
 221 #endif
 222                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 223 #ifdef RULES_DEBUG
 224                 if (i->empty)
 225                         pr_cont("empty\n");
 226                 else
 227                         pr_cont("%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                         pr_debug("Rule %d [%p]: ", k, r->func);
 259                         if (r->var >= 0) {
 260                                 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]);
 261                                 if (hw_is_mask(r->var)) {
 262                                         m = hw_param_mask(params, r->var);
 263                                         pr_cont("%x", *m->bits);
 264                                 } else {
 265                                         i = hw_param_interval(params, r->var);
 266                                         if (i->empty)
 267                                                 pr_cont("empty");
 268                                         else
 269                                                 pr_cont("%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                                 pr_cont(" -> ");
 279                                 if (hw_is_mask(r->var))
 280                                         pr_cont("%x", *m->bits);
 281                                 else {
 282                                         if (i->empty)
 283                                                 pr_cont("empty");
 284                                         else
 285                                                 pr_cont("%c%u %u%c",
 286                                                        i->openmin ? '(' : '[', i->min,
 287                                                        i->max, i->openmax ? ')' : ']');
 288                                 }
 289                         }
 290                         pr_cont("\n");
 291 #endif
 292                         rstamps[k] = stamp;
 293                         if (changed && r->var >= 0) {
 294                                 params->cmask |= (1 << r->var);
 295                                 vstamps[r->var] = stamp;
 296                                 again = 1;
 297                         }
 298                         if (changed < 0)
 299                                 return changed;
 300                         stamp++;
 301                 }
 302         } while (again);
 303         if (!params->msbits) {
 304                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 305                 if (snd_interval_single(i))
 306                         params->msbits = snd_interval_value(i);
 307         }
 308
 309         if (!params->rate_den) {
 310                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 311                 if (snd_interval_single(i)) {
 312                         params->rate_num = snd_interval_value(i);
 313                         params->rate_den = 1;
 314                 }
 315         }
 316
 317         hw = &substream->runtime->hw;
 318         if (!params->info)
 319                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 320         if (!params->fifo_size) {
 321                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 322                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 323                 if (snd_mask_min(m) == snd_mask_max(m) &&
 324                     snd_interval_min(i) == snd_interval_max(i)) {
 325                         changed = substream->ops->ioctl(substream,
 326                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 327                         if (changed < 0)
 328                                 return changed;
 329                 }
 330         }
 331         params->rmask = 0;
 332         return 0;
 333 }
 334
 335 EXPORT_SYMBOL(snd_pcm_hw_refine);
 336
 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 338                                   struct snd_pcm_hw_params __user * _params)
 339 {
 340         struct snd_pcm_hw_params *params;
 341         int err;
 342
 343         params = memdup_user(_params, sizeof(*params));
 344         if (IS_ERR(params))
 345                 return PTR_ERR(params);
 346
 347         err = snd_pcm_hw_refine(substream, params);
 348         if (copy_to_user(_params, params, sizeof(*params))) {
 349                 if (!err)
 350                         err = -EFAULT;
 351         }
 352
 353         kfree(params);
 354         return err;
 355 }
 356
 357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 358 {
 359         int usecs;
 360
 361         if (! runtime->rate)
 362                 return -1; /* invalid */
 363
 364         /* take 75% of period time as the deadline */
 365         usecs = (750000 / runtime->rate) * runtime->period_size;
 366         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 367                 runtime->rate;
 368
 369         return usecs;
 370 }
 371
 372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 373 {
 374         snd_pcm_stream_lock_irq(substream);
 375         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 376                 substream->runtime->status->state = state;
 377         snd_pcm_stream_unlock_irq(substream);
 378 }
 379
 380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 381                              struct snd_pcm_hw_params *params)
 382 {
 383         struct snd_pcm_runtime *runtime;
 384         int err, usecs;
 385         unsigned int bits;
 386         snd_pcm_uframes_t frames;
 387
 388         if (PCM_RUNTIME_CHECK(substream))
 389                 return -ENXIO;
 390         runtime = substream->runtime;
 391         snd_pcm_stream_lock_irq(substream);
 392         switch (runtime->status->state) {
 393         case SNDRV_PCM_STATE_OPEN:
 394         case SNDRV_PCM_STATE_SETUP:
 395         case SNDRV_PCM_STATE_PREPARED:
 396                 break;
 397         default:
 398                 snd_pcm_stream_unlock_irq(substream);
 399                 return -EBADFD;
 400         }
 401         snd_pcm_stream_unlock_irq(substream);
 402 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 403         if (!substream->oss.oss)
 404 #endif
 405                 if (atomic_read(&substream->mmap_count))
 406                         return -EBADFD;
 407
 408         params->rmask = ~0U;
 409         err = snd_pcm_hw_refine(substream, params);
 410         if (err < 0)
 411                 goto _error;
 412
 413         err = snd_pcm_hw_params_choose(substream, params);
 414         if (err < 0)
 415                 goto _error;
 416
 417         if (substream->ops->hw_params != NULL) {
 418                 err = substream->ops->hw_params(substream, params);
 419                 if (err < 0)
 420                         goto _error;
 421         }
 422
 423         runtime->access = params_access(params);
 424         runtime->format = params_format(params);
 425         runtime->subformat = params_subformat(params);
 426         runtime->channels = params_channels(params);
 427         runtime->rate = params_rate(params);
 428         runtime->period_size = params_period_size(params);
 429         runtime->periods = params_periods(params);
 430         runtime->buffer_size = params_buffer_size(params);
 431         runtime->info = params->info;
 432         runtime->rate_num = params->rate_num;
 433         runtime->rate_den = params->rate_den;
 434         runtime->no_period_wakeup =
 435                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 436                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 437
 438         bits = snd_pcm_format_physical_width(runtime->format);
 439         runtime->sample_bits = bits;
 440         bits *= runtime->channels;
 441         runtime->frame_bits = bits;
 442         frames = 1;
 443         while (bits % 8 != 0) {
 444                 bits *= 2;
 445                 frames *= 2;
 446         }
 447         runtime->byte_align = bits / 8;
 448         runtime->min_align = frames;
 449
 450         /* Default sw params */
 451         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 452         runtime->period_step = 1;
 453         runtime->control->avail_min = runtime->period_size;
 454         runtime->start_threshold = 1;
 455         runtime->stop_threshold = runtime->buffer_size;
 456         runtime->silence_threshold = 0;
 457         runtime->silence_size = 0;
 458         runtime->boundary = runtime->buffer_size;
 459         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 460                 runtime->boundary *= 2;
 461
 462         snd_pcm_timer_resolution_change(substream);
 463         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 464
 465         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 466                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 467         if ((usecs = period_to_usecs(runtime)) >= 0)
 468                 pm_qos_add_request(&substream->latency_pm_qos_req,
 469                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 470         return 0;
 471  _error:
 472         /* hardware might be unusable from this time,
 473            so we force application to retry to set
 474            the correct hardware parameter settings */
 475         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 476         if (substream->ops->hw_free != NULL)
 477                 substream->ops->hw_free(substream);
 478         return err;
 479 }
 480
 481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 482                                   struct snd_pcm_hw_params __user * _params)
 483 {
 484         struct snd_pcm_hw_params *params;
 485         int err;
 486
 487         params = memdup_user(_params, sizeof(*params));
 488         if (IS_ERR(params))
 489                 return PTR_ERR(params);
 490
 491         err = snd_pcm_hw_params(substream, params);
 492         if (copy_to_user(_params, params, sizeof(*params))) {
 493                 if (!err)
 494                         err = -EFAULT;
 495         }
 496
 497         kfree(params);
 498         return err;
 499 }
 500
 501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 502 {
 503         struct snd_pcm_runtime *runtime;
 504         int result = 0;
 505
 506         if (PCM_RUNTIME_CHECK(substream))
 507                 return -ENXIO;
 508         runtime = substream->runtime;
 509         snd_pcm_stream_lock_irq(substream);
 510         switch (runtime->status->state) {
 511         case SNDRV_PCM_STATE_SETUP:
 512         case SNDRV_PCM_STATE_PREPARED:
 513                 break;
 514         default:
 515                 snd_pcm_stream_unlock_irq(substream);
 516                 return -EBADFD;
 517         }
 518         snd_pcm_stream_unlock_irq(substream);
 519         if (atomic_read(&substream->mmap_count))
 520                 return -EBADFD;
 521         if (substream->ops->hw_free)
 522                 result = substream->ops->hw_free(substream);
 523         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 524         pm_qos_remove_request(&substream->latency_pm_qos_req);
 525         return result;
 526 }
 527
 528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 529                              struct snd_pcm_sw_params *params)
 530 {
 531         struct snd_pcm_runtime *runtime;
 532         int err;
 533
 534         if (PCM_RUNTIME_CHECK(substream))
 535                 return -ENXIO;
 536         runtime = substream->runtime;
 537         snd_pcm_stream_lock_irq(substream);
 538         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 539                 snd_pcm_stream_unlock_irq(substream);
 540                 return -EBADFD;
 541         }
 542         snd_pcm_stream_unlock_irq(substream);
 543
 544         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 545                 return -EINVAL;
 546         if (params->avail_min == 0)
 547                 return -EINVAL;
 548         if (params->silence_size >= runtime->boundary) {
 549                 if (params->silence_threshold != 0)
 550                         return -EINVAL;
 551         } else {
 552                 if (params->silence_size > params->silence_threshold)
 553                         return -EINVAL;
 554                 if (params->silence_threshold > runtime->buffer_size)
 555                         return -EINVAL;
 556         }
 557         err = 0;
 558         snd_pcm_stream_lock_irq(substream);
 559         runtime->tstamp_mode = params->tstamp_mode;
 560         runtime->period_step = params->period_step;
 561         runtime->control->avail_min = params->avail_min;
 562         runtime->start_threshold = params->start_threshold;
 563         runtime->stop_threshold = params->stop_threshold;
 564         runtime->silence_threshold = params->silence_threshold;
 565         runtime->silence_size = params->silence_size;
 566         params->boundary = runtime->boundary;
 567         if (snd_pcm_running(substream)) {
 568                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 569                     runtime->silence_size > 0)
 570                         snd_pcm_playback_silence(substream, ULONG_MAX);
 571                 err = snd_pcm_update_state(substream, runtime);
 572         }
 573         snd_pcm_stream_unlock_irq(substream);
 574         return err;
 575 }
 576
 577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 578                                   struct snd_pcm_sw_params __user * _params)
 579 {
 580         struct snd_pcm_sw_params params;
 581         int err;
 582         if (copy_from_user(&params, _params, sizeof(params)))
 583                 return -EFAULT;
 584         err = snd_pcm_sw_params(substream, &params);
 585         if (copy_to_user(_params, &params, sizeof(params)))
 586                 return -EFAULT;
 587         return err;
 588 }
 589
 590 int snd_pcm_status(struct snd_pcm_substream *substream,
 591                    struct snd_pcm_status *status)
 592 {
 593         struct snd_pcm_runtime *runtime = substream->runtime;
 594
 595         snd_pcm_stream_lock_irq(substream);
 596         status->state = runtime->status->state;
 597         status->suspended_state = runtime->status->suspended_state;
 598         if (status->state == SNDRV_PCM_STATE_OPEN)
 599                 goto _end;
 600         status->trigger_tstamp = runtime->trigger_tstamp;
 601         if (snd_pcm_running(substream)) {
 602                 snd_pcm_update_hw_ptr(substream);
 603                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 604                         status->tstamp = runtime->status->tstamp;
 605                         status->audio_tstamp =
 606                                 runtime->status->audio_tstamp;
 607                         goto _tstamp_end;
 608                 }
 609         }
 610         snd_pcm_gettime(runtime, &status->tstamp);
 611  _tstamp_end:
 612         status->appl_ptr = runtime->control->appl_ptr;
 613         status->hw_ptr = runtime->status->hw_ptr;
 614         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 615                 status->avail = snd_pcm_playback_avail(runtime);
 616                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 617                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 618                         status->delay = runtime->buffer_size - status->avail;
 619                         status->delay += runtime->delay;
 620                 } else
 621                         status->delay = 0;
 622         } else {
 623                 status->avail = snd_pcm_capture_avail(runtime);
 624                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 625                         status->delay = status->avail + runtime->delay;
 626                 else
 627                         status->delay = 0;
 628         }
 629         status->avail_max = runtime->avail_max;
 630         status->overrange = runtime->overrange;
 631         runtime->avail_max = 0;
 632         runtime->overrange = 0;
 633  _end:
 634         snd_pcm_stream_unlock_irq(substream);
 635         return 0;
 636 }
 637
 638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 639                                struct snd_pcm_status __user * _status)
 640 {
 641         struct snd_pcm_status status;
 642         int res;
 643
 644         memset(&status, 0, sizeof(status));
 645         res = snd_pcm_status(substream, &status);
 646         if (res < 0)
 647                 return res;
 648         if (copy_to_user(_status, &status, sizeof(status)))
 649                 return -EFAULT;
 650         return 0;
 651 }
 652
 653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 654                                 struct snd_pcm_channel_info * info)
 655 {
 656         struct snd_pcm_runtime *runtime;
 657         unsigned int channel;
 658
 659         channel = info->channel;
 660         runtime = substream->runtime;
 661         snd_pcm_stream_lock_irq(substream);
 662         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 663                 snd_pcm_stream_unlock_irq(substream);
 664                 return -EBADFD;
 665         }
 666         snd_pcm_stream_unlock_irq(substream);
 667         if (channel >= runtime->channels)
 668                 return -EINVAL;
 669         memset(info, 0, sizeof(*info));
 670         info->channel = channel;
 671         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 672 }
 673
 674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 675                                      struct snd_pcm_channel_info __user * _info)
 676 {
 677         struct snd_pcm_channel_info info;
 678         int res;
 679
 680         if (copy_from_user(&info, _info, sizeof(info)))
 681                 return -EFAULT;
 682         res = snd_pcm_channel_info(substream, &info);
 683         if (res < 0)
 684                 return res;
 685         if (copy_to_user(_info, &info, sizeof(info)))
 686                 return -EFAULT;
 687         return 0;
 688 }
 689
 690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 691 {
 692         struct snd_pcm_runtime *runtime = substream->runtime;
 693         if (runtime->trigger_master == NULL)
 694                 return;
 695         if (runtime->trigger_master == substream) {
 696                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 697         } else {
 698                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 699                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 700         }
 701         runtime->trigger_master = NULL;
 702 }
 703
 704 struct action_ops {
 705         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 706         int (*do_action)(struct snd_pcm_substream *substream, int state);
 707         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 708         void (*post_action)(struct snd_pcm_substream *substream, int state);
 709 };
 710
 711 /*
 712  *  this functions is core for handling of linked stream
 713  *  Note: the stream state might be changed also on failure
 714  *  Note2: call with calling stream lock + link lock
 715  */
 716 static int snd_pcm_action_group(struct action_ops *ops,
 717                                 struct snd_pcm_substream *substream,
 718                                 int state, int do_lock)
 719 {
 720         struct snd_pcm_substream *s = NULL;
 721         struct snd_pcm_substream *s1;
 722         int res = 0;
 723
 724         snd_pcm_group_for_each_entry(s, substream) {
 725                 if (do_lock && s != substream)
 726                         spin_lock_nested(&s->self_group.lock,
 727                                          SINGLE_DEPTH_NESTING);
 728                 res = ops->pre_action(s, state);
 729                 if (res < 0)
 730                         goto _unlock;
 731         }
 732         snd_pcm_group_for_each_entry(s, substream) {
 733                 res = ops->do_action(s, state);
 734                 if (res < 0) {
 735                         if (ops->undo_action) {
 736                                 snd_pcm_group_for_each_entry(s1, substream) {
 737                                         if (s1 == s) /* failed stream */
 738                                                 break;
 739                                         ops->undo_action(s1, state);
 740                                 }
 741                         }
 742                         s = NULL; /* unlock all */
 743                         goto _unlock;
 744                 }
 745         }
 746         snd_pcm_group_for_each_entry(s, substream) {
 747                 ops->post_action(s, state);
 748         }
 749  _unlock:
 750         if (do_lock) {
 751                 /* unlock streams */
 752                 snd_pcm_group_for_each_entry(s1, substream) {
 753                         if (s1 != substream)
 754                                 spin_unlock(&s1->self_group.lock);
 755                         if (s1 == s)    /* end */
 756                                 break;
 757                 }
 758         }
 759         return res;
 760 }
 761
 762 /*
 763  *  Note: call with stream lock
 764  */
 765 static int snd_pcm_action_single(struct action_ops *ops,
 766                                  struct snd_pcm_substream *substream,
 767                                  int state)
 768 {
 769         int res;
 770
 771         res = ops->pre_action(substream, state);
 772         if (res < 0)
 773                 return res;
 774         res = ops->do_action(substream, state);
 775         if (res == 0)
 776                 ops->post_action(substream, state);
 777         else if (ops->undo_action)
 778                 ops->undo_action(substream, state);
 779         return res;
 780 }
 781
 782 /*
 783  *  Note: call with stream lock
 784  */
 785 static int snd_pcm_action(struct action_ops *ops,
 786                           struct snd_pcm_substream *substream,
 787                           int state)
 788 {
 789         int res;
 790
 791         if (snd_pcm_stream_linked(substream)) {
 792                 if (!spin_trylock(&substream->group->lock)) {
 793                         spin_unlock(&substream->self_group.lock);
 794                         spin_lock(&substream->group->lock);
 795                         spin_lock(&substream->self_group.lock);
 796                 }
 797                 res = snd_pcm_action_group(ops, substream, state, 1);
 798                 spin_unlock(&substream->group->lock);
 799         } else {
 800                 res = snd_pcm_action_single(ops, substream, state);
 801         }
 802         return res;
 803 }
 804
 805 /*
 806  *  Note: don't use any locks before
 807  */
 808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 809                                    struct snd_pcm_substream *substream,
 810                                    int state)
 811 {
 812         int res;
 813
 814         read_lock_irq(&snd_pcm_link_rwlock);
 815         if (snd_pcm_stream_linked(substream)) {
 816                 spin_lock(&substream->group->lock);
 817                 spin_lock(&substream->self_group.lock);
 818                 res = snd_pcm_action_group(ops, substream, state, 1);
 819                 spin_unlock(&substream->self_group.lock);
 820                 spin_unlock(&substream->group->lock);
 821         } else {
 822                 spin_lock(&substream->self_group.lock);
 823                 res = snd_pcm_action_single(ops, substream, state);
 824                 spin_unlock(&substream->self_group.lock);
 825         }
 826         read_unlock_irq(&snd_pcm_link_rwlock);
 827         return res;
 828 }
 829
 830 /*
 831  */
 832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 833                                     struct snd_pcm_substream *substream,
 834                                     int state)
 835 {
 836         int res;
 837
 838         down_read(&snd_pcm_link_rwsem);
 839         if (snd_pcm_stream_linked(substream))
 840                 res = snd_pcm_action_group(ops, substream, state, 0);
 841         else
 842                 res = snd_pcm_action_single(ops, substream, state);
 843         up_read(&snd_pcm_link_rwsem);
 844         return res;
 845 }
 846
 847 /*
 848  * start callbacks
 849  */
 850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 851 {
 852         struct snd_pcm_runtime *runtime = substream->runtime;
 853         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 854                 return -EBADFD;
 855         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 856             !snd_pcm_playback_data(substream))
 857                 return -EPIPE;
 858         runtime->trigger_master = substream;
 859         return 0;
 860 }
 861
 862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 863 {
 864         if (substream->runtime->trigger_master != substream)
 865                 return 0;
 866         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 867 }
 868
 869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 870 {
 871         if (substream->runtime->trigger_master == substream)
 872                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 873 }
 874
 875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 876 {
 877         struct snd_pcm_runtime *runtime = substream->runtime;
 878         snd_pcm_trigger_tstamp(substream);
 879         runtime->hw_ptr_jiffies = jiffies;
 880         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 881                                                             runtime->rate;
 882         runtime->status->state = state;
 883         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 884             runtime->silence_size > 0)
 885                 snd_pcm_playback_silence(substream, ULONG_MAX);
 886         if (substream->timer)
 887                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 888                                  &runtime->trigger_tstamp);
 889 }
 890
 891 static struct action_ops snd_pcm_action_start = {
 892         .pre_action = snd_pcm_pre_start,
 893         .do_action = snd_pcm_do_start,
 894         .undo_action = snd_pcm_undo_start,
 895         .post_action = snd_pcm_post_start
 896 };
 897
 898 /**
 899  * snd_pcm_start - start all linked streams
 900  * @substream: the PCM substream instance
 901  *
 902  * Return: Zero if successful, or a negative error code.
 903  */
 904 int snd_pcm_start(struct snd_pcm_substream *substream)
 905 {
 906         return snd_pcm_action(&snd_pcm_action_start, substream,
 907                               SNDRV_PCM_STATE_RUNNING);
 908 }
 909
 910 /*
 911  * stop callbacks
 912  */
 913 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 914 {
 915         struct snd_pcm_runtime *runtime = substream->runtime;
 916         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 917                 return -EBADFD;
 918         runtime->trigger_master = substream;
 919         return 0;
 920 }
 921
 922 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 923 {
 924         if (substream->runtime->trigger_master == substream &&
 925             snd_pcm_running(substream))
 926                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 927         return 0; /* unconditonally stop all substreams */
 928 }
 929
 930 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 931 {
 932         struct snd_pcm_runtime *runtime = substream->runtime;
 933         if (runtime->status->state != state) {
 934                 snd_pcm_trigger_tstamp(substream);
 935                 if (substream->timer)
 936                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 937                                          &runtime->trigger_tstamp);
 938                 runtime->status->state = state;
 939         }
 940         wake_up(&runtime->sleep);
 941         wake_up(&runtime->tsleep);
 942 }
 943
 944 static struct action_ops snd_pcm_action_stop = {
 945         .pre_action = snd_pcm_pre_stop,
 946         .do_action = snd_pcm_do_stop,
 947         .post_action = snd_pcm_post_stop
 948 };
 949
 950 /**
 951  * snd_pcm_stop - try to stop all running streams in the substream group
 952  * @substream: the PCM substream instance
 953  * @state: PCM state after stopping the stream
 954  *
 955  * The state of each stream is then changed to the given state unconditionally.
 956  *
 957  * Return: Zero if successful, or a negative error code.
 958  */
 959 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
 960 {
 961         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 962 }
 963
 964 EXPORT_SYMBOL(snd_pcm_stop);
 965
 966 /**
 967  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 968  * @substream: the PCM substream
 969  *
 970  * After stopping, the state is changed to SETUP.
 971  * Unlike snd_pcm_stop(), this affects only the given stream.
 972  *
 973  * Return: Zero if succesful, or a negative error code.
 974  */
 975 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 976 {
 977         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 978                                      SNDRV_PCM_STATE_SETUP);
 979 }
 980
 981 /*
 982  * pause callbacks
 983  */
 984 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 985 {
 986         struct snd_pcm_runtime *runtime = substream->runtime;
 987         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 988                 return -ENOSYS;
 989         if (push) {
 990                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 991                         return -EBADFD;
 992         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 993                 return -EBADFD;
 994         runtime->trigger_master = substream;
 995         return 0;
 996 }
 997
 998 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 999 {
1000         if (substream->runtime->trigger_master != substream)
1001                 return 0;
1002         /* some drivers might use hw_ptr to recover from the pause -
1003            update the hw_ptr now */
1004         if (push)
1005                 snd_pcm_update_hw_ptr(substream);
1006         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1007          * a delta between the current jiffies, this gives a large enough
1008          * delta, effectively to skip the check once.
1009          */
1010         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1011         return substream->ops->trigger(substream,
1012                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1013                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1014 }
1015
1016 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1017 {
1018         if (substream->runtime->trigger_master == substream)
1019                 substream->ops->trigger(substream,
1020                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1021                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1022 }
1023
1024 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1025 {
1026         struct snd_pcm_runtime *runtime = substream->runtime;
1027         snd_pcm_trigger_tstamp(substream);
1028         if (push) {
1029                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1030                 if (substream->timer)
1031                         snd_timer_notify(substream->timer,
1032                                          SNDRV_TIMER_EVENT_MPAUSE,
1033                                          &runtime->trigger_tstamp);
1034                 wake_up(&runtime->sleep);
1035                 wake_up(&runtime->tsleep);
1036         } else {
1037                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1038                 if (substream->timer)
1039                         snd_timer_notify(substream->timer,
1040                                          SNDRV_TIMER_EVENT_MCONTINUE,
1041                                          &runtime->trigger_tstamp);
1042         }
1043 }
1044
1045 static struct action_ops snd_pcm_action_pause = {
1046         .pre_action = snd_pcm_pre_pause,
1047         .do_action = snd_pcm_do_pause,
1048         .undo_action = snd_pcm_undo_pause,
1049         .post_action = snd_pcm_post_pause
1050 };
1051
1052 /*
1053  * Push/release the pause for all linked streams.
1054  */
1055 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1056 {
1057         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1058 }
1059
1060 #ifdef CONFIG_PM
1061 /* suspend */
1062
1063 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065         struct snd_pcm_runtime *runtime = substream->runtime;
1066         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1067                 return -EBUSY;
1068         runtime->trigger_master = substream;
1069         return 0;
1070 }
1071
1072 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1073 {
1074         struct snd_pcm_runtime *runtime = substream->runtime;
1075         if (runtime->trigger_master != substream)
1076                 return 0;
1077         if (! snd_pcm_running(substream))
1078                 return 0;
1079         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1080         return 0; /* suspend unconditionally */
1081 }
1082
1083 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1084 {
1085         struct snd_pcm_runtime *runtime = substream->runtime;
1086         snd_pcm_trigger_tstamp(substream);
1087         if (substream->timer)
1088                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1089                                  &runtime->trigger_tstamp);
1090         runtime->status->suspended_state = runtime->status->state;
1091         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1092         wake_up(&runtime->sleep);
1093         wake_up(&runtime->tsleep);
1094 }
1095
1096 static struct action_ops snd_pcm_action_suspend = {
1097         .pre_action = snd_pcm_pre_suspend,
1098         .do_action = snd_pcm_do_suspend,
1099         .post_action = snd_pcm_post_suspend
1100 };
1101
1102 /**
1103  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1104  * @substream: the PCM substream
1105  *
1106  * After this call, all streams are changed to SUSPENDED state.
1107  *
1108  * Return: Zero if successful (or @substream is %NULL), or a negative error
1109  * code.
1110  */
1111 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1112 {
1113         int err;
1114         unsigned long flags;
1115
1116         if (! substream)
1117                 return 0;
1118
1119         snd_pcm_stream_lock_irqsave(substream, flags);
1120         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1121         snd_pcm_stream_unlock_irqrestore(substream, flags);
1122         return err;
1123 }
1124
1125 EXPORT_SYMBOL(snd_pcm_suspend);
1126
1127 /**
1128  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1129  * @pcm: the PCM instance
1130  *
1131  * After this call, all streams are changed to SUSPENDED state.
1132  *
1133  * Return: Zero if successful (or @pcm is %NULL), or a negative error code.
1134  */
1135 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1136 {
1137         struct snd_pcm_substream *substream;
1138         int stream, err = 0;
1139
1140         if (! pcm)
1141                 return 0;
1142
1143         for (stream = 0; stream < 2; stream++) {
1144                 for (substream = pcm->streams[stream].substream;
1145                      substream; substream = substream->next) {
1146                         /* FIXME: the open/close code should lock this as well */
1147                         if (substream->runtime == NULL)
1148                                 continue;
1149                         err = snd_pcm_suspend(substream);
1150                         if (err < 0 && err != -EBUSY)
1151                                 return err;
1152                 }
1153         }
1154         return 0;
1155 }
1156
1157 EXPORT_SYMBOL(snd_pcm_suspend_all);
1158
1159 /* resume */
1160
1161 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1162 {
1163         struct snd_pcm_runtime *runtime = substream->runtime;
1164         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1165                 return -ENOSYS;
1166         runtime->trigger_master = substream;
1167         return 0;
1168 }
1169
1170 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1171 {
1172         struct snd_pcm_runtime *runtime = substream->runtime;
1173         if (runtime->trigger_master != substream)
1174                 return 0;
1175         /* DMA not running previously? */
1176         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1177             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1178              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1179                 return 0;
1180         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1181 }
1182
1183 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1184 {
1185         if (substream->runtime->trigger_master == substream &&
1186             snd_pcm_running(substream))
1187                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1188 }
1189
1190 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1191 {
1192         struct snd_pcm_runtime *runtime = substream->runtime;
1193         snd_pcm_trigger_tstamp(substream);
1194         if (substream->timer)
1195                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1196                                  &runtime->trigger_tstamp);
1197         runtime->status->state = runtime->status->suspended_state;
1198 }
1199
1200 static struct action_ops snd_pcm_action_resume = {
1201         .pre_action = snd_pcm_pre_resume,
1202         .do_action = snd_pcm_do_resume,
1203         .undo_action = snd_pcm_undo_resume,
1204         .post_action = snd_pcm_post_resume
1205 };
1206
1207 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208 {
1209         struct snd_card *card = substream->pcm->card;
1210         int res;
1211
1212         snd_power_lock(card);
1213         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1214                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1215         snd_power_unlock(card);
1216         return res;
1217 }
1218
1219 #else
1220
1221 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1222 {
1223         return -ENOSYS;
1224 }
1225
1226 #endif /* CONFIG_PM */
1227
1228 /*
1229  * xrun ioctl
1230  *
1231  * Change the RUNNING stream(s) to XRUN state.
1232  */
1233 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1234 {
1235         struct snd_card *card = substream->pcm->card;
1236         struct snd_pcm_runtime *runtime = substream->runtime;
1237         int result;
1238
1239         snd_power_lock(card);
1240         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1241                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1242                 if (result < 0)
1243                         goto _unlock;
1244         }
1245
1246         snd_pcm_stream_lock_irq(substream);
1247         switch (runtime->status->state) {
1248         case SNDRV_PCM_STATE_XRUN:
1249                 result = 0;     /* already there */
1250                 break;
1251         case SNDRV_PCM_STATE_RUNNING:
1252                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1253                 break;
1254         default:
1255                 result = -EBADFD;
1256         }
1257         snd_pcm_stream_unlock_irq(substream);
1258  _unlock:
1259         snd_power_unlock(card);
1260         return result;
1261 }
1262
1263 /*
1264  * reset ioctl
1265  */
1266 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1267 {
1268         struct snd_pcm_runtime *runtime = substream->runtime;
1269         switch (runtime->status->state) {
1270         case SNDRV_PCM_STATE_RUNNING:
1271         case SNDRV_PCM_STATE_PREPARED:
1272         case SNDRV_PCM_STATE_PAUSED:
1273         case SNDRV_PCM_STATE_SUSPENDED:
1274                 return 0;
1275         default:
1276                 return -EBADFD;
1277         }
1278 }
1279
1280 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1281 {
1282         struct snd_pcm_runtime *runtime = substream->runtime;
1283         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1284         if (err < 0)
1285                 return err;
1286         runtime->hw_ptr_base = 0;
1287         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1288                 runtime->status->hw_ptr % runtime->period_size;
1289         runtime->silence_start = runtime->status->hw_ptr;
1290         runtime->silence_filled = 0;
1291         return 0;
1292 }
1293
1294 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1295 {
1296         struct snd_pcm_runtime *runtime = substream->runtime;
1297         runtime->control->appl_ptr = runtime->status->hw_ptr;
1298         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1299             runtime->silence_size > 0)
1300                 snd_pcm_playback_silence(substream, ULONG_MAX);
1301 }
1302
1303 static struct action_ops snd_pcm_action_reset = {
1304         .pre_action = snd_pcm_pre_reset,
1305         .do_action = snd_pcm_do_reset,
1306         .post_action = snd_pcm_post_reset
1307 };
1308
1309 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1310 {
1311         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1312 }
1313
1314 /*
1315  * prepare ioctl
1316  */
1317 /* we use the second argument for updating f_flags */
1318 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1319                                int f_flags)
1320 {
1321         struct snd_pcm_runtime *runtime = substream->runtime;
1322         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1323             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1324                 return -EBADFD;
1325         if (snd_pcm_running(substream))
1326                 return -EBUSY;
1327         substream->f_flags = f_flags;
1328         return 0;
1329 }
1330
1331 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1332 {
1333         int err;
1334         err = substream->ops->prepare(substream);
1335         if (err < 0)
1336                 return err;
1337         return snd_pcm_do_reset(substream, 0);
1338 }
1339
1340 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1341 {
1342         struct snd_pcm_runtime *runtime = substream->runtime;
1343         runtime->control->appl_ptr = runtime->status->hw_ptr;
1344         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1345 }
1346
1347 static struct action_ops snd_pcm_action_prepare = {
1348         .pre_action = snd_pcm_pre_prepare,
1349         .do_action = snd_pcm_do_prepare,
1350         .post_action = snd_pcm_post_prepare
1351 };
1352
1353 /**
1354  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1355  * @substream: the PCM substream instance
1356  * @file: file to refer f_flags
1357  *
1358  * Return: Zero if successful, or a negative error code.
1359  */
1360 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1361                            struct file *file)
1362 {
1363         int res;
1364         struct snd_card *card = substream->pcm->card;
1365         int f_flags;
1366
1367         if (file)
1368                 f_flags = file->f_flags;
1369         else
1370                 f_flags = substream->f_flags;
1371
1372         snd_power_lock(card);
1373         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1374                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1375                                                substream, f_flags);
1376         snd_power_unlock(card);
1377         return res;
1378 }
1379
1380 /*
1381  * drain ioctl
1382  */
1383
1384 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386         struct snd_pcm_runtime *runtime = substream->runtime;
1387         switch (runtime->status->state) {
1388         case SNDRV_PCM_STATE_OPEN:
1389         case SNDRV_PCM_STATE_DISCONNECTED:
1390         case SNDRV_PCM_STATE_SUSPENDED:
1391                 return -EBADFD;
1392         }
1393         runtime->trigger_master = substream;
1394         return 0;
1395 }
1396
1397 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1398 {
1399         struct snd_pcm_runtime *runtime = substream->runtime;
1400         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1401                 switch (runtime->status->state) {
1402                 case SNDRV_PCM_STATE_PREPARED:
1403                         /* start playback stream if possible */
1404                         if (! snd_pcm_playback_empty(substream)) {
1405                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1406                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1407                         }
1408                         break;
1409                 case SNDRV_PCM_STATE_RUNNING:
1410                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411                         break;
1412                 case SNDRV_PCM_STATE_XRUN:
1413                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414                         break;
1415                 default:
1416                         break;
1417                 }
1418         } else {
1419                 /* stop running stream */
1420                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423                         snd_pcm_do_stop(substream, new_state);
1424                         snd_pcm_post_stop(substream, new_state);
1425                 }
1426         }
1427         return 0;
1428 }
1429
1430 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431 {
1432 }
1433
1434 static struct action_ops snd_pcm_action_drain_init = {
1435         .pre_action = snd_pcm_pre_drain_init,
1436         .do_action = snd_pcm_do_drain_init,
1437         .post_action = snd_pcm_post_drain_init
1438 };
1439
1440 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442 /*
1443  * Drain the stream(s).
1444  * When the substream is linked, sync until the draining of all playback streams
1445  * is finished.
1446  * After this call, all streams are supposed to be either SETUP or DRAINING
1447  * (capture only) state.
1448  */
1449 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450                          struct file *file)
1451 {
1452         struct snd_card *card;
1453         struct snd_pcm_runtime *runtime;
1454         struct snd_pcm_substream *s;
1455         wait_queue_t wait;
1456         int result = 0;
1457         int nonblock = 0;
1458
1459         card = substream->pcm->card;
1460         runtime = substream->runtime;
1461
1462         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463                 return -EBADFD;
1464
1465         snd_power_lock(card);
1466         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468                 if (result < 0) {
1469                         snd_power_unlock(card);
1470                         return result;
1471                 }
1472         }
1473
1474         if (file) {
1475                 if (file->f_flags & O_NONBLOCK)
1476                         nonblock = 1;
1477         } else if (substream->f_flags & O_NONBLOCK)
1478                 nonblock = 1;
1479
1480         down_read(&snd_pcm_link_rwsem);
1481         snd_pcm_stream_lock_irq(substream);
1482         /* resume pause */
1483         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484                 snd_pcm_pause(substream, 0);
1485
1486         /* pre-start/stop - all running streams are changed to DRAINING state */
1487         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488         if (result < 0)
1489                 goto unlock;
1490         /* in non-blocking, we don't wait in ioctl but let caller poll */
1491         if (nonblock) {
1492                 result = -EAGAIN;
1493                 goto unlock;
1494         }
1495
1496         for (;;) {
1497                 long tout;
1498                 struct snd_pcm_runtime *to_check;
1499                 if (signal_pending(current)) {
1500                         result = -ERESTARTSYS;
1501                         break;
1502                 }
1503                 /* find a substream to drain */
1504                 to_check = NULL;
1505                 snd_pcm_group_for_each_entry(s, substream) {
1506                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507                                 continue;
1508                         runtime = s->runtime;
1509                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510                                 to_check = runtime;
1511                                 break;
1512                         }
1513                 }
1514                 if (!to_check)
1515                         break; /* all drained */
1516                 init_waitqueue_entry(&wait, current);
1517                 add_wait_queue(&to_check->sleep, &wait);
1518                 snd_pcm_stream_unlock_irq(substream);
1519                 up_read(&snd_pcm_link_rwsem);
1520                 snd_power_unlock(card);
1521                 if (runtime->no_period_wakeup)
1522                         tout = MAX_SCHEDULE_TIMEOUT;
1523                 else {
1524                         tout = 10;
1525                         if (runtime->rate) {
1526                                 long t = runtime->period_size * 2 / runtime->rate;
1527                                 tout = max(t, tout);
1528                         }
1529                         tout = msecs_to_jiffies(tout * 1000);
1530                 }
1531                 tout = schedule_timeout_interruptible(tout);
1532                 snd_power_lock(card);
1533                 down_read(&snd_pcm_link_rwsem);
1534                 snd_pcm_stream_lock_irq(substream);
1535                 remove_wait_queue(&to_check->sleep, &wait);
1536                 if (card->shutdown) {
1537                         result = -ENODEV;
1538                         break;
1539                 }
1540                 if (tout == 0) {
1541                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542                                 result = -ESTRPIPE;
1543                         else {
1544                                 dev_dbg(substream->pcm->card->dev,
1545                                         "playback drain error (DMA or IRQ trouble?)\n");
1546                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1547                                 result = -EIO;
1548                         }
1549                         break;
1550                 }
1551         }
1552
1553  unlock:
1554         snd_pcm_stream_unlock_irq(substream);
1555         up_read(&snd_pcm_link_rwsem);
1556         snd_power_unlock(card);
1557
1558         return result;
1559 }
1560
1561 /*
1562  * drop ioctl
1563  *
1564  * Immediately put all linked substreams into SETUP state.
1565  */
1566 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1567 {
1568         struct snd_pcm_runtime *runtime;
1569         int result = 0;
1570
1571         if (PCM_RUNTIME_CHECK(substream))
1572                 return -ENXIO;
1573         runtime = substream->runtime;
1574
1575         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1576             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1577             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1578                 return -EBADFD;
1579
1580         snd_pcm_stream_lock_irq(substream);
1581         /* resume pause */
1582         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1583                 snd_pcm_pause(substream, 0);
1584
1585         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1586         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1587         snd_pcm_stream_unlock_irq(substream);
1588
1589         return result;
1590 }
1591
1592
1593 static bool is_pcm_file(struct file *file)
1594 {
1595         struct inode *inode = file_inode(file);
1596         unsigned int minor;
1597
1598         if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major)
1599                 return false;
1600         minor = iminor(inode);
1601         return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) ||
1602                 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE);
1603 }
1604
1605 /*
1606  * PCM link handling
1607  */
1608 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1609 {
1610         int res = 0;
1611         struct snd_pcm_file *pcm_file;
1612         struct snd_pcm_substream *substream1;
1613         struct snd_pcm_group *group;
1614         struct fd f = fdget(fd);
1615
1616         if (!f.file)
1617                 return -EBADFD;
1618         if (!is_pcm_file(f.file)) {
1619                 res = -EBADFD;
1620                 goto _badf;
1621         }
1622         pcm_file = f.file->private_data;
1623         substream1 = pcm_file->substream;
1624         group = kmalloc(sizeof(*group), GFP_KERNEL);
1625         if (!group) {
1626                 res = -ENOMEM;
1627                 goto _nolock;
1628         }
1629         down_write(&snd_pcm_link_rwsem);
1630         write_lock_irq(&snd_pcm_link_rwlock);
1631         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1632             substream->runtime->status->state != substream1->runtime->status->state) {
1633                 res = -EBADFD;
1634                 goto _end;
1635         }
1636         if (snd_pcm_stream_linked(substream1)) {
1637                 res = -EALREADY;
1638                 goto _end;
1639         }
1640         if (!snd_pcm_stream_linked(substream)) {
1641                 substream->group = group;
1642                 group = NULL;
1643                 spin_lock_init(&substream->group->lock);
1644                 INIT_LIST_HEAD(&substream->group->substreams);
1645                 list_add_tail(&substream->link_list, &substream->group->substreams);
1646                 substream->group->count = 1;
1647         }
1648         list_add_tail(&substream1->link_list, &substream->group->substreams);
1649         substream->group->count++;
1650         substream1->group = substream->group;
1651  _end:
1652         write_unlock_irq(&snd_pcm_link_rwlock);
1653         up_write(&snd_pcm_link_rwsem);
1654  _nolock:
1655         snd_card_unref(substream1->pcm->card);
1656         kfree(group);
1657  _badf:
1658         fdput(f);
1659         return res;
1660 }
1661
1662 static void relink_to_local(struct snd_pcm_substream *substream)
1663 {
1664         substream->group = &substream->self_group;
1665         INIT_LIST_HEAD(&substream->self_group.substreams);
1666         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1667 }
1668
1669 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1670 {
1671         struct snd_pcm_substream *s;
1672         int res = 0;
1673
1674         down_write(&snd_pcm_link_rwsem);
1675         write_lock_irq(&snd_pcm_link_rwlock);
1676         if (!snd_pcm_stream_linked(substream)) {
1677                 res = -EALREADY;
1678                 goto _end;
1679         }
1680         list_del(&substream->link_list);
1681         substream->group->count--;
1682         if (substream->group->count == 1) {     /* detach the last stream, too */
1683                 snd_pcm_group_for_each_entry(s, substream) {
1684                         relink_to_local(s);
1685                         break;
1686                 }
1687                 kfree(substream->group);
1688         }
1689         relink_to_local(substream);
1690        _end:
1691         write_unlock_irq(&snd_pcm_link_rwlock);
1692         up_write(&snd_pcm_link_rwsem);
1693         return res;
1694 }
1695
1696 /*
1697  * hw configurator
1698  */
1699 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1700                                struct snd_pcm_hw_rule *rule)
1701 {
1702         struct snd_interval t;
1703         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1704                      hw_param_interval_c(params, rule->deps[1]), &t);
1705         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1706 }
1707
1708 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1709                                struct snd_pcm_hw_rule *rule)
1710 {
1711         struct snd_interval t;
1712         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1713                      hw_param_interval_c(params, rule->deps[1]), &t);
1714         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715 }
1716
1717 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1718                                    struct snd_pcm_hw_rule *rule)
1719 {
1720         struct snd_interval t;
1721         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1722                          hw_param_interval_c(params, rule->deps[1]),
1723                          (unsigned long) rule->private, &t);
1724         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1725 }
1726
1727 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1728                                    struct snd_pcm_hw_rule *rule)
1729 {
1730         struct snd_interval t;
1731         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1732                          (unsigned long) rule->private,
1733                          hw_param_interval_c(params, rule->deps[1]), &t);
1734         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1735 }
1736
1737 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1738                                   struct snd_pcm_hw_rule *rule)
1739 {
1740         unsigned int k;
1741         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1742         struct snd_mask m;
1743         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1744         snd_mask_any(&m);
1745         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1746                 int bits;
1747                 if (! snd_mask_test(mask, k))
1748                         continue;
1749                 bits = snd_pcm_format_physical_width(k);
1750                 if (bits <= 0)
1751                         continue; /* ignore invalid formats */
1752                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1753                         snd_mask_reset(&m, k);
1754         }
1755         return snd_mask_refine(mask, &m);
1756 }
1757
1758 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1759                                        struct snd_pcm_hw_rule *rule)
1760 {
1761         struct snd_interval t;
1762         unsigned int k;
1763         t.min = UINT_MAX;
1764         t.max = 0;
1765         t.openmin = 0;
1766         t.openmax = 0;
1767         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1768                 int bits;
1769                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1770                         continue;
1771                 bits = snd_pcm_format_physical_width(k);
1772                 if (bits <= 0)
1773                         continue; /* ignore invalid formats */
1774                 if (t.min > (unsigned)bits)
1775                         t.min = bits;
1776                 if (t.max < (unsigned)bits)
1777                         t.max = bits;
1778         }
1779         t.integer = 1;
1780         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1781 }
1782
1783 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1784 #error "Change this table"
1785 #endif
1786
1787 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1788                                  48000, 64000, 88200, 96000, 176400, 192000 };
1789
1790 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1791         .count = ARRAY_SIZE(rates),
1792         .list = rates,
1793 };
1794
1795 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1796                                 struct snd_pcm_hw_rule *rule)
1797 {
1798         struct snd_pcm_hardware *hw = rule->private;
1799         return snd_interval_list(hw_param_interval(params, rule->var),
1800                                  snd_pcm_known_rates.count,
1801                                  snd_pcm_known_rates.list, hw->rates);
1802 }
1803
1804 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1805                                             struct snd_pcm_hw_rule *rule)
1806 {
1807         struct snd_interval t;
1808         struct snd_pcm_substream *substream = rule->private;
1809         t.min = 0;
1810         t.max = substream->buffer_bytes_max;
1811         t.openmin = 0;
1812         t.openmax = 0;
1813         t.integer = 1;
1814         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1815 }
1816
1817 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1818 {
1819         struct snd_pcm_runtime *runtime = substream->runtime;
1820         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1821         int k, err;
1822
1823         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1824                 snd_mask_any(constrs_mask(constrs, k));
1825         }
1826
1827         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1828                 snd_interval_any(constrs_interval(constrs, k));
1829         }
1830
1831         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1832         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1833         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1834         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1835         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1836
1837         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1838                                    snd_pcm_hw_rule_format, NULL,
1839                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1840         if (err < 0)
1841                 return err;
1842         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1843                                   snd_pcm_hw_rule_sample_bits, NULL,
1844                                   SNDRV_PCM_HW_PARAM_FORMAT,
1845                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1849                                   snd_pcm_hw_rule_div, NULL,
1850                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1854                                   snd_pcm_hw_rule_mul, NULL,
1855                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1859                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1860                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1864                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1869                                   snd_pcm_hw_rule_div, NULL,
1870                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1874                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1875                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1879                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1880                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1884                                   snd_pcm_hw_rule_div, NULL,
1885                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1889                                   snd_pcm_hw_rule_div, NULL,
1890                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1891         if (err < 0)
1892                 return err;
1893         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1894                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1895                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1899                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1904                                   snd_pcm_hw_rule_mul, NULL,
1905                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1906         if (err < 0)
1907                 return err;
1908         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1909                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1910                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911         if (err < 0)
1912                 return err;
1913         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1914                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1915                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1916         if (err < 0)
1917                 return err;
1918         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1919                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1920                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1921         if (err < 0)
1922                 return err;
1923         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1924                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1925                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1926         if (err < 0)
1927                 return err;
1928         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1929                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1930                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1931         if (err < 0)
1932                 return err;
1933         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1934                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1935                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1936         if (err < 0)
1937                 return err;
1938         return 0;
1939 }
1940
1941 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1942 {
1943         struct snd_pcm_runtime *runtime = substream->runtime;
1944         struct snd_pcm_hardware *hw = &runtime->hw;
1945         int err;
1946         unsigned int mask = 0;
1947
1948         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1949                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1950         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1951                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1952         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1953                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1954                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1955                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1956                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1957                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1958                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1959         }
1960         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1961         if (err < 0)
1962                 return err;
1963
1964         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1965         if (err < 0)
1966                 return err;
1967
1968         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1969         if (err < 0)
1970                 return err;
1971
1972         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1973                                            hw->channels_min, hw->channels_max);
1974         if (err < 0)
1975                 return err;
1976
1977         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1978                                            hw->rate_min, hw->rate_max);
1979         if (err < 0)
1980                 return err;
1981
1982         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1983                                            hw->period_bytes_min, hw->period_bytes_max);
1984         if (err < 0)
1985                 return err;
1986
1987         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1988                                            hw->periods_min, hw->periods_max);
1989         if (err < 0)
1990                 return err;
1991
1992         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1993                                            hw->period_bytes_min, hw->buffer_bytes_max);
1994         if (err < 0)
1995                 return err;
1996
1997         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1998                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1999                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2000         if (err < 0)
2001                 return err;
2002
2003         /* FIXME: remove */
2004         if (runtime->dma_bytes) {
2005                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2006                 if (err < 0)
2007                         return err;
2008         }
2009
2010         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2011                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2012                                           snd_pcm_hw_rule_rate, hw,
2013                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2014                 if (err < 0)
2015                         return err;
2016         }
2017
2018         /* FIXME: this belong to lowlevel */
2019         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2020
2021         return 0;
2022 }
2023
2024 static void pcm_release_private(struct snd_pcm_substream *substream)
2025 {
2026         snd_pcm_unlink(substream);
2027 }
2028
2029 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2030 {
2031         substream->ref_count--;
2032         if (substream->ref_count > 0)
2033                 return;
2034
2035         snd_pcm_drop(substream);
2036         if (substream->hw_opened) {
2037                 if (substream->ops->hw_free != NULL)
2038                         substream->ops->hw_free(substream);
2039                 substream->ops->close(substream);
2040                 substream->hw_opened = 0;
2041         }
2042         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2043                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2044         if (substream->pcm_release) {
2045                 substream->pcm_release(substream);
2046                 substream->pcm_release = NULL;
2047         }
2048         snd_pcm_detach_substream(substream);
2049 }
2050
2051 EXPORT_SYMBOL(snd_pcm_release_substream);
2052
2053 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2054                            struct file *file,
2055                            struct snd_pcm_substream **rsubstream)
2056 {
2057         struct snd_pcm_substream *substream;
2058         int err;
2059
2060         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2061         if (err < 0)
2062                 return err;
2063         if (substream->ref_count > 1) {
2064                 *rsubstream = substream;
2065                 return 0;
2066         }
2067
2068         err = snd_pcm_hw_constraints_init(substream);
2069         if (err < 0) {
2070                 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n");
2071                 goto error;
2072         }
2073
2074         if ((err = substream->ops->open(substream)) < 0)
2075                 goto error;
2076
2077         substream->hw_opened = 1;
2078
2079         err = snd_pcm_hw_constraints_complete(substream);
2080         if (err < 0) {
2081                 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n");
2082                 goto error;
2083         }
2084
2085         *rsubstream = substream;
2086         return 0;
2087
2088  error:
2089         snd_pcm_release_substream(substream);
2090         return err;
2091 }
2092
2093 EXPORT_SYMBOL(snd_pcm_open_substream);
2094
2095 static int snd_pcm_open_file(struct file *file,
2096                              struct snd_pcm *pcm,
2097                              int stream)
2098 {
2099         struct snd_pcm_file *pcm_file;
2100         struct snd_pcm_substream *substream;
2101         int err;
2102
2103         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2104         if (err < 0)
2105                 return err;
2106
2107         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2108         if (pcm_file == NULL) {
2109                 snd_pcm_release_substream(substream);
2110                 return -ENOMEM;
2111         }
2112         pcm_file->substream = substream;
2113         if (substream->ref_count == 1) {
2114                 substream->file = pcm_file;
2115                 substream->pcm_release = pcm_release_private;
2116         }
2117         file->private_data = pcm_file;
2118
2119         return 0;
2120 }
2121
2122 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2123 {
2124         struct snd_pcm *pcm;
2125         int err = nonseekable_open(inode, file);
2126         if (err < 0)
2127                 return err;
2128         pcm = snd_lookup_minor_data(iminor(inode),
2129                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2130         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2131         if (pcm)
2132                 snd_card_unref(pcm->card);
2133         return err;
2134 }
2135
2136 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2137 {
2138         struct snd_pcm *pcm;
2139         int err = nonseekable_open(inode, file);
2140         if (err < 0)
2141                 return err;
2142         pcm = snd_lookup_minor_data(iminor(inode),
2143                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2144         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2145         if (pcm)
2146                 snd_card_unref(pcm->card);
2147         return err;
2148 }
2149
2150 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2151 {
2152         int err;
2153         wait_queue_t wait;
2154
2155         if (pcm == NULL) {
2156                 err = -ENODEV;
2157                 goto __error1;
2158         }
2159         err = snd_card_file_add(pcm->card, file);
2160         if (err < 0)
2161                 goto __error1;
2162         if (!try_module_get(pcm->card->module)) {
2163                 err = -EFAULT;
2164                 goto __error2;
2165         }
2166         init_waitqueue_entry(&wait, current);
2167         add_wait_queue(&pcm->open_wait, &wait);
2168         mutex_lock(&pcm->open_mutex);
2169         while (1) {
2170                 err = snd_pcm_open_file(file, pcm, stream);
2171                 if (err >= 0)
2172                         break;
2173                 if (err == -EAGAIN) {
2174                         if (file->f_flags & O_NONBLOCK) {
2175                                 err = -EBUSY;
2176                                 break;
2177                         }
2178                 } else
2179                         break;
2180                 set_current_state(TASK_INTERRUPTIBLE);
2181                 mutex_unlock(&pcm->open_mutex);
2182                 schedule();
2183                 mutex_lock(&pcm->open_mutex);
2184                 if (pcm->card->shutdown) {
2185                         err = -ENODEV;
2186                         break;
2187                 }
2188                 if (signal_pending(current)) {
2189                         err = -ERESTARTSYS;
2190                         break;
2191                 }
2192         }
2193         remove_wait_queue(&pcm->open_wait, &wait);
2194         mutex_unlock(&pcm->open_mutex);
2195         if (err < 0)
2196                 goto __error;
2197         return err;
2198
2199       __error:
2200         module_put(pcm->card->module);
2201       __error2:
2202         snd_card_file_remove(pcm->card, file);
2203       __error1:
2204         return err;
2205 }
2206
2207 static int snd_pcm_release(struct inode *inode, struct file *file)
2208 {
2209         struct snd_pcm *pcm;
2210         struct snd_pcm_substream *substream;
2211         struct snd_pcm_file *pcm_file;
2212
2213         pcm_file = file->private_data;
2214         substream = pcm_file->substream;
2215         if (snd_BUG_ON(!substream))
2216                 return -ENXIO;
2217         pcm = substream->pcm;
2218         mutex_lock(&pcm->open_mutex);
2219         snd_pcm_release_substream(substream);
2220         kfree(pcm_file);
2221         mutex_unlock(&pcm->open_mutex);
2222         wake_up(&pcm->open_wait);
2223         module_put(pcm->card->module);
2224         snd_card_file_remove(pcm->card, file);
2225         return 0;
2226 }
2227
2228 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2229                                                  snd_pcm_uframes_t frames)
2230 {
2231         struct snd_pcm_runtime *runtime = substream->runtime;
2232         snd_pcm_sframes_t appl_ptr;
2233         snd_pcm_sframes_t ret;
2234         snd_pcm_sframes_t hw_avail;
2235
2236         if (frames == 0)
2237                 return 0;
2238
2239         snd_pcm_stream_lock_irq(substream);
2240         switch (runtime->status->state) {
2241         case SNDRV_PCM_STATE_PREPARED:
2242                 break;
2243         case SNDRV_PCM_STATE_DRAINING:
2244         case SNDRV_PCM_STATE_RUNNING:
2245                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2246                         break;
2247                 /* Fall through */
2248         case SNDRV_PCM_STATE_XRUN:
2249                 ret = -EPIPE;
2250                 goto __end;
2251         case SNDRV_PCM_STATE_SUSPENDED:
2252                 ret = -ESTRPIPE;
2253                 goto __end;
2254         default:
2255                 ret = -EBADFD;
2256                 goto __end;
2257         }
2258
2259         hw_avail = snd_pcm_playback_hw_avail(runtime);
2260         if (hw_avail <= 0) {
2261                 ret = 0;
2262                 goto __end;
2263         }
2264         if (frames > (snd_pcm_uframes_t)hw_avail)
2265                 frames = hw_avail;
2266         appl_ptr = runtime->control->appl_ptr - frames;
2267         if (appl_ptr < 0)
2268                 appl_ptr += runtime->boundary;
2269         runtime->control->appl_ptr = appl_ptr;
2270         ret = frames;
2271  __end:
2272         snd_pcm_stream_unlock_irq(substream);
2273         return ret;
2274 }
2275
2276 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2277                                                 snd_pcm_uframes_t frames)
2278 {
2279         struct snd_pcm_runtime *runtime = substream->runtime;
2280         snd_pcm_sframes_t appl_ptr;
2281         snd_pcm_sframes_t ret;
2282         snd_pcm_sframes_t hw_avail;
2283
2284         if (frames == 0)
2285                 return 0;
2286
2287         snd_pcm_stream_lock_irq(substream);
2288         switch (runtime->status->state) {
2289         case SNDRV_PCM_STATE_PREPARED:
2290         case SNDRV_PCM_STATE_DRAINING:
2291                 break;
2292         case SNDRV_PCM_STATE_RUNNING:
2293                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2294                         break;
2295                 /* Fall through */
2296         case SNDRV_PCM_STATE_XRUN:
2297                 ret = -EPIPE;
2298                 goto __end;
2299         case SNDRV_PCM_STATE_SUSPENDED:
2300                 ret = -ESTRPIPE;
2301                 goto __end;
2302         default:
2303                 ret = -EBADFD;
2304                 goto __end;
2305         }
2306
2307         hw_avail = snd_pcm_capture_hw_avail(runtime);
2308         if (hw_avail <= 0) {
2309                 ret = 0;
2310                 goto __end;
2311         }
2312         if (frames > (snd_pcm_uframes_t)hw_avail)
2313                 frames = hw_avail;
2314         appl_ptr = runtime->control->appl_ptr - frames;
2315         if (appl_ptr < 0)
2316                 appl_ptr += runtime->boundary;
2317         runtime->control->appl_ptr = appl_ptr;
2318         ret = frames;
2319  __end:
2320         snd_pcm_stream_unlock_irq(substream);
2321         return ret;
2322 }
2323
2324 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2325                                                   snd_pcm_uframes_t frames)
2326 {
2327         struct snd_pcm_runtime *runtime = substream->runtime;
2328         snd_pcm_sframes_t appl_ptr;
2329         snd_pcm_sframes_t ret;
2330         snd_pcm_sframes_t avail;
2331
2332         if (frames == 0)
2333                 return 0;
2334
2335         snd_pcm_stream_lock_irq(substream);
2336         switch (runtime->status->state) {
2337         case SNDRV_PCM_STATE_PREPARED:
2338         case SNDRV_PCM_STATE_PAUSED:
2339                 break;
2340         case SNDRV_PCM_STATE_DRAINING:
2341         case SNDRV_PCM_STATE_RUNNING:
2342                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2343                         break;
2344                 /* Fall through */
2345         case SNDRV_PCM_STATE_XRUN:
2346                 ret = -EPIPE;
2347                 goto __end;
2348         case SNDRV_PCM_STATE_SUSPENDED:
2349                 ret = -ESTRPIPE;
2350                 goto __end;
2351         default:
2352                 ret = -EBADFD;
2353                 goto __end;
2354         }
2355
2356         avail = snd_pcm_playback_avail(runtime);
2357         if (avail <= 0) {
2358                 ret = 0;
2359                 goto __end;
2360         }
2361         if (frames > (snd_pcm_uframes_t)avail)
2362                 frames = avail;
2363         appl_ptr = runtime->control->appl_ptr + frames;
2364         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365                 appl_ptr -= runtime->boundary;
2366         runtime->control->appl_ptr = appl_ptr;
2367         ret = frames;
2368  __end:
2369         snd_pcm_stream_unlock_irq(substream);
2370         return ret;
2371 }
2372
2373 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2374                                                  snd_pcm_uframes_t frames)
2375 {
2376         struct snd_pcm_runtime *runtime = substream->runtime;
2377         snd_pcm_sframes_t appl_ptr;
2378         snd_pcm_sframes_t ret;
2379         snd_pcm_sframes_t avail;
2380
2381         if (frames == 0)
2382                 return 0;
2383
2384         snd_pcm_stream_lock_irq(substream);
2385         switch (runtime->status->state) {
2386         case SNDRV_PCM_STATE_PREPARED:
2387         case SNDRV_PCM_STATE_DRAINING:
2388         case SNDRV_PCM_STATE_PAUSED:
2389                 break;
2390         case SNDRV_PCM_STATE_RUNNING:
2391                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2392                         break;
2393                 /* Fall through */
2394         case SNDRV_PCM_STATE_XRUN:
2395                 ret = -EPIPE;
2396                 goto __end;
2397         case SNDRV_PCM_STATE_SUSPENDED:
2398                 ret = -ESTRPIPE;
2399                 goto __end;
2400         default:
2401                 ret = -EBADFD;
2402                 goto __end;
2403         }
2404
2405         avail = snd_pcm_capture_avail(runtime);
2406         if (avail <= 0) {
2407                 ret = 0;
2408                 goto __end;
2409         }
2410         if (frames > (snd_pcm_uframes_t)avail)
2411                 frames = avail;
2412         appl_ptr = runtime->control->appl_ptr + frames;
2413         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2414                 appl_ptr -= runtime->boundary;
2415         runtime->control->appl_ptr = appl_ptr;
2416         ret = frames;
2417  __end:
2418         snd_pcm_stream_unlock_irq(substream);
2419         return ret;
2420 }
2421
2422 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2423 {
2424         struct snd_pcm_runtime *runtime = substream->runtime;
2425         int err;
2426
2427         snd_pcm_stream_lock_irq(substream);
2428         switch (runtime->status->state) {
2429         case SNDRV_PCM_STATE_DRAINING:
2430                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2431                         goto __badfd;
2432                 /* Fall through */
2433         case SNDRV_PCM_STATE_RUNNING:
2434                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2435                         break;
2436                 /* Fall through */
2437         case SNDRV_PCM_STATE_PREPARED:
2438         case SNDRV_PCM_STATE_SUSPENDED:
2439                 err = 0;
2440                 break;
2441         case SNDRV_PCM_STATE_XRUN:
2442                 err = -EPIPE;
2443                 break;
2444         default:
2445               __badfd:
2446                 err = -EBADFD;
2447                 break;
2448         }
2449         snd_pcm_stream_unlock_irq(substream);
2450         return err;
2451 }
2452
2453 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2454                          snd_pcm_sframes_t __user *res)
2455 {
2456         struct snd_pcm_runtime *runtime = substream->runtime;
2457         int err;
2458         snd_pcm_sframes_t n = 0;
2459
2460         snd_pcm_stream_lock_irq(substream);
2461         switch (runtime->status->state) {
2462         case SNDRV_PCM_STATE_DRAINING:
2463                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2464                         goto __badfd;
2465                 /* Fall through */
2466         case SNDRV_PCM_STATE_RUNNING:
2467                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2468                         break;
2469                 /* Fall through */
2470         case SNDRV_PCM_STATE_PREPARED:
2471         case SNDRV_PCM_STATE_SUSPENDED:
2472                 err = 0;
2473                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2474                         n = snd_pcm_playback_hw_avail(runtime);
2475                 else
2476                         n = snd_pcm_capture_avail(runtime);
2477                 n += runtime->delay;
2478                 break;
2479         case SNDRV_PCM_STATE_XRUN:
2480                 err = -EPIPE;
2481                 break;
2482         default:
2483               __badfd:
2484                 err = -EBADFD;
2485                 break;
2486         }
2487         snd_pcm_stream_unlock_irq(substream);
2488         if (!err)
2489                 if (put_user(n, res))
2490                         err = -EFAULT;
2491         return err;
2492 }
2493
2494 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2495                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2496 {
2497         struct snd_pcm_runtime *runtime = substream->runtime;
2498         struct snd_pcm_sync_ptr sync_ptr;
2499         volatile struct snd_pcm_mmap_status *status;
2500         volatile struct snd_pcm_mmap_control *control;
2501         int err;
2502
2503         memset(&sync_ptr, 0, sizeof(sync_ptr));
2504         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2505                 return -EFAULT;
2506         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2507                 return -EFAULT;
2508         status = runtime->status;
2509         control = runtime->control;
2510         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2511                 err = snd_pcm_hwsync(substream);
2512                 if (err < 0)
2513                         return err;
2514         }
2515         snd_pcm_stream_lock_irq(substream);
2516         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2517                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2518         else
2519                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2520         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2521                 control->avail_min = sync_ptr.c.control.avail_min;
2522         else
2523                 sync_ptr.c.control.avail_min = control->avail_min;
2524         sync_ptr.s.status.state = status->state;
2525         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2526         sync_ptr.s.status.tstamp = status->tstamp;
2527         sync_ptr.s.status.suspended_state = status->suspended_state;
2528         snd_pcm_stream_unlock_irq(substream);
2529         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2530                 return -EFAULT;
2531         return 0;
2532 }
2533
2534 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2535 {
2536         struct snd_pcm_runtime *runtime = substream->runtime;
2537         int arg;
2538
2539         if (get_user(arg, _arg))
2540                 return -EFAULT;
2541         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2542                 return -EINVAL;
2543         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2544         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2545                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2546         return 0;
2547 }
2548
2549 static int snd_pcm_common_ioctl1(struct file *file,
2550                                  struct snd_pcm_substream *substream,
2551                                  unsigned int cmd, void __user *arg)
2552 {
2553         switch (cmd) {
2554         case SNDRV_PCM_IOCTL_PVERSION:
2555                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2556         case SNDRV_PCM_IOCTL_INFO:
2557                 return snd_pcm_info_user(substream, arg);
2558         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2559                 return 0;
2560         case SNDRV_PCM_IOCTL_TTSTAMP:
2561                 return snd_pcm_tstamp(substream, arg);
2562         case SNDRV_PCM_IOCTL_HW_REFINE:
2563                 return snd_pcm_hw_refine_user(substream, arg);
2564         case SNDRV_PCM_IOCTL_HW_PARAMS:
2565                 return snd_pcm_hw_params_user(substream, arg);
2566         case SNDRV_PCM_IOCTL_HW_FREE:
2567                 return snd_pcm_hw_free(substream);
2568         case SNDRV_PCM_IOCTL_SW_PARAMS:
2569                 return snd_pcm_sw_params_user(substream, arg);
2570         case SNDRV_PCM_IOCTL_STATUS:
2571                 return snd_pcm_status_user(substream, arg);
2572         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2573                 return snd_pcm_channel_info_user(substream, arg);
2574         case SNDRV_PCM_IOCTL_PREPARE:
2575                 return snd_pcm_prepare(substream, file);
2576         case SNDRV_PCM_IOCTL_RESET:
2577                 return snd_pcm_reset(substream);
2578         case SNDRV_PCM_IOCTL_START:
2579                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2580         case SNDRV_PCM_IOCTL_LINK:
2581                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2582         case SNDRV_PCM_IOCTL_UNLINK:
2583                 return snd_pcm_unlink(substream);
2584         case SNDRV_PCM_IOCTL_RESUME:
2585                 return snd_pcm_resume(substream);
2586         case SNDRV_PCM_IOCTL_XRUN:
2587                 return snd_pcm_xrun(substream);
2588         case SNDRV_PCM_IOCTL_HWSYNC:
2589                 return snd_pcm_hwsync(substream);
2590         case SNDRV_PCM_IOCTL_DELAY:
2591                 return snd_pcm_delay(substream, arg);
2592         case SNDRV_PCM_IOCTL_SYNC_PTR:
2593                 return snd_pcm_sync_ptr(substream, arg);
2594 #ifdef CONFIG_SND_SUPPORT_OLD_API
2595         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2596                 return snd_pcm_hw_refine_old_user(substream, arg);
2597         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2598                 return snd_pcm_hw_params_old_user(substream, arg);
2599 #endif
2600         case SNDRV_PCM_IOCTL_DRAIN:
2601                 return snd_pcm_drain(substream, file);
2602         case SNDRV_PCM_IOCTL_DROP:
2603                 return snd_pcm_drop(substream);
2604         case SNDRV_PCM_IOCTL_PAUSE:
2605         {
2606                 int res;
2607                 snd_pcm_stream_lock_irq(substream);
2608                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2609                 snd_pcm_stream_unlock_irq(substream);
2610                 return res;
2611         }
2612         }
2613         pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd);
2614         return -ENOTTY;
2615 }
2616
2617 static int snd_pcm_playback_ioctl1(struct file *file,
2618                                    struct snd_pcm_substream *substream,
2619                                    unsigned int cmd, void __user *arg)
2620 {
2621         if (snd_BUG_ON(!substream))
2622                 return -ENXIO;
2623         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2624                 return -EINVAL;
2625         switch (cmd) {
2626         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2627         {
2628                 struct snd_xferi xferi;
2629                 struct snd_xferi __user *_xferi = arg;
2630                 struct snd_pcm_runtime *runtime = substream->runtime;
2631                 snd_pcm_sframes_t result;
2632                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2633                         return -EBADFD;
2634                 if (put_user(0, &_xferi->result))
2635                         return -EFAULT;
2636                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2637                         return -EFAULT;
2638                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2639                 __put_user(result, &_xferi->result);
2640                 return result < 0 ? result : 0;
2641         }
2642         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2643         {
2644                 struct snd_xfern xfern;
2645                 struct snd_xfern __user *_xfern = arg;
2646                 struct snd_pcm_runtime *runtime = substream->runtime;
2647                 void __user **bufs;
2648                 snd_pcm_sframes_t result;
2649                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2650                         return -EBADFD;
2651                 if (runtime->channels > 128)
2652                         return -EINVAL;
2653                 if (put_user(0, &_xfern->result))
2654                         return -EFAULT;
2655                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2656                         return -EFAULT;
2657
2658                 bufs = memdup_user(xfern.bufs,
2659                                    sizeof(void *) * runtime->channels);
2660                 if (IS_ERR(bufs))
2661                         return PTR_ERR(bufs);
2662                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2663                 kfree(bufs);
2664                 __put_user(result, &_xfern->result);
2665                 return result < 0 ? result : 0;
2666         }
2667         case SNDRV_PCM_IOCTL_REWIND:
2668         {
2669                 snd_pcm_uframes_t frames;
2670                 snd_pcm_uframes_t __user *_frames = arg;
2671                 snd_pcm_sframes_t result;
2672                 if (get_user(frames, _frames))
2673                         return -EFAULT;
2674                 if (put_user(0, _frames))
2675                         return -EFAULT;
2676                 result = snd_pcm_playback_rewind(substream, frames);
2677                 __put_user(result, _frames);
2678                 return result < 0 ? result : 0;
2679         }
2680         case SNDRV_PCM_IOCTL_FORWARD:
2681         {
2682                 snd_pcm_uframes_t frames;
2683                 snd_pcm_uframes_t __user *_frames = arg;
2684                 snd_pcm_sframes_t result;
2685                 if (get_user(frames, _frames))
2686                         return -EFAULT;
2687                 if (put_user(0, _frames))
2688                         return -EFAULT;
2689                 result = snd_pcm_playback_forward(substream, frames);
2690                 __put_user(result, _frames);
2691                 return result < 0 ? result : 0;
2692         }
2693         }
2694         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2695 }
2696
2697 static int snd_pcm_capture_ioctl1(struct file *file,
2698                                   struct snd_pcm_substream *substream,
2699                                   unsigned int cmd, void __user *arg)
2700 {
2701         if (snd_BUG_ON(!substream))
2702                 return -ENXIO;
2703         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2704                 return -EINVAL;
2705         switch (cmd) {
2706         case SNDRV_PCM_IOCTL_READI_FRAMES:
2707         {
2708                 struct snd_xferi xferi;
2709                 struct snd_xferi __user *_xferi = arg;
2710                 struct snd_pcm_runtime *runtime = substream->runtime;
2711                 snd_pcm_sframes_t result;
2712                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2713                         return -EBADFD;
2714                 if (put_user(0, &_xferi->result))
2715                         return -EFAULT;
2716                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2717                         return -EFAULT;
2718                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2719                 __put_user(result, &_xferi->result);
2720                 return result < 0 ? result : 0;
2721         }
2722         case SNDRV_PCM_IOCTL_READN_FRAMES:
2723         {
2724                 struct snd_xfern xfern;
2725                 struct snd_xfern __user *_xfern = arg;
2726                 struct snd_pcm_runtime *runtime = substream->runtime;
2727                 void *bufs;
2728                 snd_pcm_sframes_t result;
2729                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2730                         return -EBADFD;
2731                 if (runtime->channels > 128)
2732                         return -EINVAL;
2733                 if (put_user(0, &_xfern->result))
2734                         return -EFAULT;
2735                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2736                         return -EFAULT;
2737
2738                 bufs = memdup_user(xfern.bufs,
2739                                    sizeof(void *) * runtime->channels);
2740                 if (IS_ERR(bufs))
2741                         return PTR_ERR(bufs);
2742                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2743                 kfree(bufs);
2744                 __put_user(result, &_xfern->result);
2745                 return result < 0 ? result : 0;
2746         }
2747         case SNDRV_PCM_IOCTL_REWIND:
2748         {
2749                 snd_pcm_uframes_t frames;
2750                 snd_pcm_uframes_t __user *_frames = arg;
2751                 snd_pcm_sframes_t result;
2752                 if (get_user(frames, _frames))
2753                         return -EFAULT;
2754                 if (put_user(0, _frames))
2755                         return -EFAULT;
2756                 result = snd_pcm_capture_rewind(substream, frames);
2757                 __put_user(result, _frames);
2758                 return result < 0 ? result : 0;
2759         }
2760         case SNDRV_PCM_IOCTL_FORWARD:
2761         {
2762                 snd_pcm_uframes_t frames;
2763                 snd_pcm_uframes_t __user *_frames = arg;
2764                 snd_pcm_sframes_t result;
2765                 if (get_user(frames, _frames))
2766                         return -EFAULT;
2767                 if (put_user(0, _frames))
2768                         return -EFAULT;
2769                 result = snd_pcm_capture_forward(substream, frames);
2770                 __put_user(result, _frames);
2771                 return result < 0 ? result : 0;
2772         }
2773         }
2774         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2775 }
2776
2777 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2778                                    unsigned long arg)
2779 {
2780         struct snd_pcm_file *pcm_file;
2781
2782         pcm_file = file->private_data;
2783
2784         if (((cmd >> 8) & 0xff) != 'A')
2785                 return -ENOTTY;
2786
2787         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2788                                        (void __user *)arg);
2789 }
2790
2791 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2792                                   unsigned long arg)
2793 {
2794         struct snd_pcm_file *pcm_file;
2795
2796         pcm_file = file->private_data;
2797
2798         if (((cmd >> 8) & 0xff) != 'A')
2799                 return -ENOTTY;
2800
2801         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2802                                       (void __user *)arg);
2803 }
2804
2805 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2806                          unsigned int cmd, void *arg)
2807 {
2808         mm_segment_t fs;
2809         int result;
2810
2811         fs = snd_enter_user();
2812         switch (substream->stream) {
2813         case SNDRV_PCM_STREAM_PLAYBACK:
2814                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2815                                                  (void __user *)arg);
2816                 break;
2817         case SNDRV_PCM_STREAM_CAPTURE:
2818                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2819                                                 (void __user *)arg);
2820                 break;
2821         default:
2822                 result = -EINVAL;
2823                 break;
2824         }
2825         snd_leave_user(fs);
2826         return result;
2827 }
2828
2829 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2830
2831 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2832                             loff_t * offset)
2833 {
2834         struct snd_pcm_file *pcm_file;
2835         struct snd_pcm_substream *substream;
2836         struct snd_pcm_runtime *runtime;
2837         snd_pcm_sframes_t result;
2838
2839         pcm_file = file->private_data;
2840         substream = pcm_file->substream;
2841         if (PCM_RUNTIME_CHECK(substream))
2842                 return -ENXIO;
2843         runtime = substream->runtime;
2844         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2845                 return -EBADFD;
2846         if (!frame_aligned(runtime, count))
2847                 return -EINVAL;
2848         count = bytes_to_frames(runtime, count);
2849         result = snd_pcm_lib_read(substream, buf, count);
2850         if (result > 0)
2851                 result = frames_to_bytes(runtime, result);
2852         return result;
2853 }
2854
2855 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2856                              size_t count, loff_t * offset)
2857 {
2858         struct snd_pcm_file *pcm_file;
2859         struct snd_pcm_substream *substream;
2860         struct snd_pcm_runtime *runtime;
2861         snd_pcm_sframes_t result;
2862
2863         pcm_file = file->private_data;
2864         substream = pcm_file->substream;
2865         if (PCM_RUNTIME_CHECK(substream))
2866                 return -ENXIO;
2867         runtime = substream->runtime;
2868         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869                 return -EBADFD;
2870         if (!frame_aligned(runtime, count))
2871                 return -EINVAL;
2872         count = bytes_to_frames(runtime, count);
2873         result = snd_pcm_lib_write(substream, buf, count);
2874         if (result > 0)
2875                 result = frames_to_bytes(runtime, result);
2876         return result;
2877 }
2878
2879 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2880                              unsigned long nr_segs, loff_t pos)
2881
2882 {
2883         struct snd_pcm_file *pcm_file;
2884         struct snd_pcm_substream *substream;
2885         struct snd_pcm_runtime *runtime;
2886         snd_pcm_sframes_t result;
2887         unsigned long i;
2888         void __user **bufs;
2889         snd_pcm_uframes_t frames;
2890
2891         pcm_file = iocb->ki_filp->private_data;
2892         substream = pcm_file->substream;
2893         if (PCM_RUNTIME_CHECK(substream))
2894                 return -ENXIO;
2895         runtime = substream->runtime;
2896         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2897                 return -EBADFD;
2898         if (nr_segs > 1024 || nr_segs != runtime->channels)
2899                 return -EINVAL;
2900         if (!frame_aligned(runtime, iov->iov_len))
2901                 return -EINVAL;
2902         frames = bytes_to_samples(runtime, iov->iov_len);
2903         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2904         if (bufs == NULL)
2905                 return -ENOMEM;
2906         for (i = 0; i < nr_segs; ++i)
2907                 bufs[i] = iov[i].iov_base;
2908         result = snd_pcm_lib_readv(substream, bufs, frames);
2909         if (result > 0)
2910                 result = frames_to_bytes(runtime, result);
2911         kfree(bufs);
2912         return result;
2913 }
2914
2915 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2916                               unsigned long nr_segs, loff_t pos)
2917 {
2918         struct snd_pcm_file *pcm_file;
2919         struct snd_pcm_substream *substream;
2920         struct snd_pcm_runtime *runtime;
2921         snd_pcm_sframes_t result;
2922         unsigned long i;
2923         void __user **bufs;
2924         snd_pcm_uframes_t frames;
2925
2926         pcm_file = iocb->ki_filp->private_data;
2927         substream = pcm_file->substream;
2928         if (PCM_RUNTIME_CHECK(substream))
2929                 return -ENXIO;
2930         runtime = substream->runtime;
2931         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2932                 return -EBADFD;
2933         if (nr_segs > 128 || nr_segs != runtime->channels ||
2934             !frame_aligned(runtime, iov->iov_len))
2935                 return -EINVAL;
2936         frames = bytes_to_samples(runtime, iov->iov_len);
2937         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2938         if (bufs == NULL)
2939                 return -ENOMEM;
2940         for (i = 0; i < nr_segs; ++i)
2941                 bufs[i] = iov[i].iov_base;
2942         result = snd_pcm_lib_writev(substream, bufs, frames);
2943         if (result > 0)
2944                 result = frames_to_bytes(runtime, result);
2945         kfree(bufs);
2946         return result;
2947 }
2948
2949 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2950 {
2951         struct snd_pcm_file *pcm_file;
2952         struct snd_pcm_substream *substream;
2953         struct snd_pcm_runtime *runtime;
2954         unsigned int mask;
2955         snd_pcm_uframes_t avail;
2956
2957         pcm_file = file->private_data;
2958
2959         substream = pcm_file->substream;
2960         if (PCM_RUNTIME_CHECK(substream))
2961                 return -ENXIO;
2962         runtime = substream->runtime;
2963
2964         poll_wait(file, &runtime->sleep, wait);
2965
2966         snd_pcm_stream_lock_irq(substream);
2967         avail = snd_pcm_playback_avail(runtime);
2968         switch (runtime->status->state) {
2969         case SNDRV_PCM_STATE_RUNNING:
2970         case SNDRV_PCM_STATE_PREPARED:
2971         case SNDRV_PCM_STATE_PAUSED:
2972                 if (avail >= runtime->control->avail_min) {
2973                         mask = POLLOUT | POLLWRNORM;
2974                         break;
2975                 }
2976                 /* Fall through */
2977         case SNDRV_PCM_STATE_DRAINING:
2978                 mask = 0;
2979                 break;
2980         default:
2981                 mask = POLLOUT | POLLWRNORM | POLLERR;
2982                 break;
2983         }
2984         snd_pcm_stream_unlock_irq(substream);
2985         return mask;
2986 }
2987
2988 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2989 {
2990         struct snd_pcm_file *pcm_file;
2991         struct snd_pcm_substream *substream;
2992         struct snd_pcm_runtime *runtime;
2993         unsigned int mask;
2994         snd_pcm_uframes_t avail;
2995
2996         pcm_file = file->private_data;
2997
2998         substream = pcm_file->substream;
2999         if (PCM_RUNTIME_CHECK(substream))
3000                 return -ENXIO;
3001         runtime = substream->runtime;
3002
3003         poll_wait(file, &runtime->sleep, wait);
3004
3005         snd_pcm_stream_lock_irq(substream);
3006         avail = snd_pcm_capture_avail(runtime);
3007         switch (runtime->status->state) {
3008         case SNDRV_PCM_STATE_RUNNING:
3009         case SNDRV_PCM_STATE_PREPARED:
3010         case SNDRV_PCM_STATE_PAUSED:
3011                 if (avail >= runtime->control->avail_min) {
3012                         mask = POLLIN | POLLRDNORM;
3013                         break;
3014                 }
3015                 mask = 0;
3016                 break;
3017         case SNDRV_PCM_STATE_DRAINING:
3018                 if (avail > 0) {
3019                         mask = POLLIN | POLLRDNORM;
3020                         break;
3021                 }
3022                 /* Fall through */
3023         default:
3024                 mask = POLLIN | POLLRDNORM | POLLERR;
3025                 break;
3026         }
3027         snd_pcm_stream_unlock_irq(substream);
3028         return mask;
3029 }
3030
3031 /*
3032  * mmap support
3033  */
3034
3035 /*
3036  * Only on coherent architectures, we can mmap the status and the control records
3037  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3038  */
3039 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3040 /*
3041  * mmap status record
3042  */
3043 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3044                                                 struct vm_fault *vmf)
3045 {
3046         struct snd_pcm_substream *substream = area->vm_private_data;
3047         struct snd_pcm_runtime *runtime;
3048
3049         if (substream == NULL)
3050                 return VM_FAULT_SIGBUS;
3051         runtime = substream->runtime;
3052         vmf->page = virt_to_page(runtime->status);
3053         get_page(vmf->page);
3054         return 0;
3055 }
3056
3057 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3058 {
3059         .fault =        snd_pcm_mmap_status_fault,
3060 };
3061
3062 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3063                                struct vm_area_struct *area)
3064 {
3065         long size;
3066         if (!(area->vm_flags & VM_READ))
3067                 return -EINVAL;
3068         size = area->vm_end - area->vm_start;
3069         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3070                 return -EINVAL;
3071         area->vm_ops = &snd_pcm_vm_ops_status;
3072         area->vm_private_data = substream;
3073         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3074         return 0;
3075 }
3076
3077 /*
3078  * mmap control record
3079  */
3080 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3081                                                 struct vm_fault *vmf)
3082 {
3083         struct snd_pcm_substream *substream = area->vm_private_data;
3084         struct snd_pcm_runtime *runtime;
3085
3086         if (substream == NULL)
3087                 return VM_FAULT_SIGBUS;
3088         runtime = substream->runtime;
3089         vmf->page = virt_to_page(runtime->control);
3090         get_page(vmf->page);
3091         return 0;
3092 }
3093
3094 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3095 {
3096         .fault =        snd_pcm_mmap_control_fault,
3097 };
3098
3099 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100                                 struct vm_area_struct *area)
3101 {
3102         long size;
3103         if (!(area->vm_flags & VM_READ))
3104                 return -EINVAL;
3105         size = area->vm_end - area->vm_start;
3106         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3107                 return -EINVAL;
3108         area->vm_ops = &snd_pcm_vm_ops_control;
3109         area->vm_private_data = substream;
3110         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3111         return 0;
3112 }
3113 #else /* ! coherent mmap */
3114 /*
3115  * don't support mmap for status and control records.
3116  */
3117 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3118                                struct vm_area_struct *area)
3119 {
3120         return -ENXIO;
3121 }
3122 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3123                                 struct vm_area_struct *area)
3124 {
3125         return -ENXIO;
3126 }
3127 #endif /* coherent mmap */
3128
3129 static inline struct page *
3130 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3131 {
3132         void *vaddr = substream->runtime->dma_area + ofs;
3133 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3134         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3135                 return virt_to_page(CAC_ADDR(vaddr));
3136 #endif
3137 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3138         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3139                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3140                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3141                 /* assume dma_handle set via pfn_to_phys() in
3142                  * mm/dma-noncoherent.c
3143                  */
3144                 return pfn_to_page(addr >> PAGE_SHIFT);
3145         }
3146 #endif
3147         return virt_to_page(vaddr);
3148 }
3149
3150 /*
3151  * fault callback for mmapping a RAM page
3152  */
3153 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3154                                                 struct vm_fault *vmf)
3155 {
3156         struct snd_pcm_substream *substream = area->vm_private_data;
3157         struct snd_pcm_runtime *runtime;
3158         unsigned long offset;
3159         struct page * page;
3160         size_t dma_bytes;
3161
3162         if (substream == NULL)
3163                 return VM_FAULT_SIGBUS;
3164         runtime = substream->runtime;
3165         offset = vmf->pgoff << PAGE_SHIFT;
3166         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3167         if (offset > dma_bytes - PAGE_SIZE)
3168                 return VM_FAULT_SIGBUS;
3169         if (substream->ops->page)
3170                 page = substream->ops->page(substream, offset);
3171         else
3172                 page = snd_pcm_default_page_ops(substream, offset);
3173         if (!page)
3174                 return VM_FAULT_SIGBUS;
3175         get_page(page);
3176         vmf->page = page;
3177         return 0;
3178 }
3179
3180 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3181         .open =         snd_pcm_mmap_data_open,
3182         .close =        snd_pcm_mmap_data_close,
3183 };
3184
3185 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3186         .open =         snd_pcm_mmap_data_open,
3187         .close =        snd_pcm_mmap_data_close,
3188         .fault =        snd_pcm_mmap_data_fault,
3189 };
3190
3191 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3192 /* This should be defined / handled globally! */
3193 #ifdef CONFIG_ARM
3194 #define ARCH_HAS_DMA_MMAP_COHERENT
3195 #endif
3196 #endif
3197
3198 /*
3199  * mmap the DMA buffer on RAM
3200  */
3201 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3202                              struct vm_area_struct *area)
3203 {
3204         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3205 #ifdef CONFIG_GENERIC_ALLOCATOR
3206         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) {
3207                 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
3208                 return remap_pfn_range(area, area->vm_start,
3209                                 substream->dma_buffer.addr >> PAGE_SHIFT,
3210                                 area->vm_end - area->vm_start, area->vm_page_prot);
3211         }
3212 #endif /* CONFIG_GENERIC_ALLOCATOR */
3213 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3214         if (!substream->ops->page &&
3215             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3216                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3217                                          area,
3218                                          substream->runtime->dma_area,
3219                                          substream->runtime->dma_addr,
3220                                          area->vm_end - area->vm_start);
3221 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3222         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3223             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3224                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3225 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3226         /* mmap with fault handler */
3227         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3228         return 0;
3229 }
3230 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3231
3232 /*
3233  * mmap the DMA buffer on I/O memory area
3234  */
3235 #if SNDRV_PCM_INFO_MMAP_IOMEM
3236 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3237                            struct vm_area_struct *area)
3238 {
3239         struct snd_pcm_runtime *runtime = substream->runtime;;
3240
3241         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3242         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3243 }
3244
3245 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3246 #endif /* SNDRV_PCM_INFO_MMAP */
3247
3248 /*
3249  * mmap DMA buffer
3250  */
3251 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3252                       struct vm_area_struct *area)
3253 {
3254         struct snd_pcm_runtime *runtime;
3255         long size;
3256         unsigned long offset;
3257         size_t dma_bytes;
3258         int err;
3259
3260         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3261                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3262                         return -EINVAL;
3263         } else {
3264                 if (!(area->vm_flags & VM_READ))
3265                         return -EINVAL;
3266         }
3267         runtime = substream->runtime;
3268         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3269                 return -EBADFD;
3270         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3271                 return -ENXIO;
3272         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3273             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3274                 return -EINVAL;
3275         size = area->vm_end - area->vm_start;
3276         offset = area->vm_pgoff << PAGE_SHIFT;
3277         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3278         if ((size_t)size > dma_bytes)
3279                 return -EINVAL;
3280         if (offset > dma_bytes - size)
3281                 return -EINVAL;
3282
3283         area->vm_ops = &snd_pcm_vm_ops_data;
3284         area->vm_private_data = substream;
3285         if (substream->ops->mmap)
3286                 err = substream->ops->mmap(substream, area);
3287         else
3288                 err = snd_pcm_lib_default_mmap(substream, area);
3289         if (!err)
3290                 atomic_inc(&substream->mmap_count);
3291         return err;
3292 }
3293
3294 EXPORT_SYMBOL(snd_pcm_mmap_data);
3295
3296 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3297 {
3298         struct snd_pcm_file * pcm_file;
3299         struct snd_pcm_substream *substream;
3300         unsigned long offset;
3301
3302         pcm_file = file->private_data;
3303         substream = pcm_file->substream;
3304         if (PCM_RUNTIME_CHECK(substream))
3305                 return -ENXIO;
3306
3307         offset = area->vm_pgoff << PAGE_SHIFT;
3308         switch (offset) {
3309         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3310                 if (pcm_file->no_compat_mmap)
3311                         return -ENXIO;
3312                 return snd_pcm_mmap_status(substream, file, area);
3313         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3314                 if (pcm_file->no_compat_mmap)
3315                         return -ENXIO;
3316                 return snd_pcm_mmap_control(substream, file, area);
3317         default:
3318                 return snd_pcm_mmap_data(substream, file, area);
3319         }
3320         return 0;
3321 }
3322
3323 static int snd_pcm_fasync(int fd, struct file * file, int on)
3324 {
3325         struct snd_pcm_file * pcm_file;
3326         struct snd_pcm_substream *substream;
3327         struct snd_pcm_runtime *runtime;
3328
3329         pcm_file = file->private_data;
3330         substream = pcm_file->substream;
3331         if (PCM_RUNTIME_CHECK(substream))
3332                 return -ENXIO;
3333         runtime = substream->runtime;
3334         return fasync_helper(fd, file, on, &runtime->fasync);
3335 }
3336
3337 /*
3338  * ioctl32 compat
3339  */
3340 #ifdef CONFIG_COMPAT
3341 #include "pcm_compat.c"
3342 #else
3343 #define snd_pcm_ioctl_compat    NULL
3344 #endif
3345
3346 /*
3347  *  To be removed helpers to keep binary compatibility
3348  */
3349
3350 #ifdef CONFIG_SND_SUPPORT_OLD_API
3351 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3352 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3353
3354 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3355                                                struct snd_pcm_hw_params_old *oparams)
3356 {
3357         unsigned int i;
3358
3359         memset(params, 0, sizeof(*params));
3360         params->flags = oparams->flags;
3361         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3362                 params->masks[i].bits[0] = oparams->masks[i];
3363         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3364         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3365         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3366         params->info = oparams->info;
3367         params->msbits = oparams->msbits;
3368         params->rate_num = oparams->rate_num;
3369         params->rate_den = oparams->rate_den;
3370         params->fifo_size = oparams->fifo_size;
3371 }
3372
3373 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3374                                              struct snd_pcm_hw_params *params)
3375 {
3376         unsigned int i;
3377
3378         memset(oparams, 0, sizeof(*oparams));
3379         oparams->flags = params->flags;
3380         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3381                 oparams->masks[i] = params->masks[i].bits[0];
3382         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3383         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3384         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3385         oparams->info = params->info;
3386         oparams->msbits = params->msbits;
3387         oparams->rate_num = params->rate_num;
3388         oparams->rate_den = params->rate_den;
3389         oparams->fifo_size = params->fifo_size;
3390 }
3391
3392 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3393                                       struct snd_pcm_hw_params_old __user * _oparams)
3394 {
3395         struct snd_pcm_hw_params *params;
3396         struct snd_pcm_hw_params_old *oparams = NULL;
3397         int err;
3398
3399         params = kmalloc(sizeof(*params), GFP_KERNEL);
3400         if (!params)
3401                 return -ENOMEM;
3402
3403         oparams = memdup_user(_oparams, sizeof(*oparams));
3404         if (IS_ERR(oparams)) {
3405                 err = PTR_ERR(oparams);
3406                 goto out;
3407         }
3408         snd_pcm_hw_convert_from_old_params(params, oparams);
3409         err = snd_pcm_hw_refine(substream, params);
3410         snd_pcm_hw_convert_to_old_params(oparams, params);
3411         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412                 if (!err)
3413                         err = -EFAULT;
3414         }
3415
3416         kfree(oparams);
3417 out:
3418         kfree(params);
3419         return err;
3420 }
3421
3422 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3423                                       struct snd_pcm_hw_params_old __user * _oparams)
3424 {
3425         struct snd_pcm_hw_params *params;
3426         struct snd_pcm_hw_params_old *oparams = NULL;
3427         int err;
3428
3429         params = kmalloc(sizeof(*params), GFP_KERNEL);
3430         if (!params)
3431                 return -ENOMEM;
3432
3433         oparams = memdup_user(_oparams, sizeof(*oparams));
3434         if (IS_ERR(oparams)) {
3435                 err = PTR_ERR(oparams);
3436                 goto out;
3437         }
3438         snd_pcm_hw_convert_from_old_params(params, oparams);
3439         err = snd_pcm_hw_params(substream, params);
3440         snd_pcm_hw_convert_to_old_params(oparams, params);
3441         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3442                 if (!err)
3443                         err = -EFAULT;
3444         }
3445
3446         kfree(oparams);
3447 out:
3448         kfree(params);
3449         return err;
3450 }
3451 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3452
3453 #ifndef CONFIG_MMU
3454 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3455                                                unsigned long addr,
3456                                                unsigned long len,
3457                                                unsigned long pgoff,
3458                                                unsigned long flags)
3459 {
3460         struct snd_pcm_file *pcm_file = file->private_data;
3461         struct snd_pcm_substream *substream = pcm_file->substream;
3462         struct snd_pcm_runtime *runtime = substream->runtime;
3463         unsigned long offset = pgoff << PAGE_SHIFT;
3464
3465         switch (offset) {
3466         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3467                 return (unsigned long)runtime->status;
3468         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3469                 return (unsigned long)runtime->control;
3470         default:
3471                 return (unsigned long)runtime->dma_area + offset;
3472         }
3473 }
3474 #else
3475 # define snd_pcm_get_unmapped_area NULL
3476 #endif
3477
3478 /*
3479  *  Register section
3480  */
3481
3482 const struct file_operations snd_pcm_f_ops[2] = {
3483         {
3484                 .owner =                THIS_MODULE,
3485                 .write =                snd_pcm_write,
3486                 .aio_write =            snd_pcm_aio_write,
3487                 .open =                 snd_pcm_playback_open,
3488                 .release =              snd_pcm_release,
3489                 .llseek =               no_llseek,
3490                 .poll =                 snd_pcm_playback_poll,
3491                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3492                 .compat_ioctl =         snd_pcm_ioctl_compat,
3493                 .mmap =                 snd_pcm_mmap,
3494                 .fasync =               snd_pcm_fasync,
3495                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3496         },
3497         {
3498                 .owner =                THIS_MODULE,
3499                 .read =                 snd_pcm_read,
3500                 .aio_read =             snd_pcm_aio_read,
3501                 .open =                 snd_pcm_capture_open,
3502                 .release =              snd_pcm_release,
3503                 .llseek =               no_llseek,
3504                 .poll =                 snd_pcm_capture_poll,
3505                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3506                 .compat_ioctl =         snd_pcm_ioctl_compat,
3507                 .mmap =                 snd_pcm_mmap,
3508                 .fasync =               snd_pcm_fasync,
3509                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3510         }
3511 };