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                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 194                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 197 #ifdef RULES_DEBUG
 198                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 199 #endif
 200                 if (changed)
 201                         params->cmask |= 1 << k;
 202                 if (changed < 0)
 203                         return changed;
 204         }
 205
 206         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 207                 i = hw_param_interval(params, k);
 208                 if (snd_interval_empty(i))
 209                         return -EINVAL;
 210                 if (!(params->rmask & (1 << k)))
 211                         continue;
 212 #ifdef RULES_DEBUG
 213                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 214                 if (i->empty)
 215                         printk("empty");
 216                 else
 217                         printk("%c%u %u%c",
 218                                i->openmin ? '(' : '[', i->min,
 219                                i->max, i->openmax ? ')' : ']');
 220                 printk(" -> ");
 221 #endif
 222                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 223 #ifdef RULES_DEBUG
 224                 if (i->empty)
 225                         printk("empty\n");
 226                 else
 227                         printk("%c%u %u%c\n",
 228                                i->openmin ? '(' : '[', i->min,
 229                                i->max, i->openmax ? ')' : ']');
 230 #endif
 231                 if (changed)
 232                         params->cmask |= 1 << k;
 233                 if (changed < 0)
 234                         return changed;
 235         }
 236
 237         for (k = 0; k < constrs->rules_num; k++)
 238                 rstamps[k] = 0;
 239         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 240                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 241         do {
 242                 again = 0;
 243                 for (k = 0; k < constrs->rules_num; k++) {
 244                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 245                         unsigned int d;
 246                         int doit = 0;
 247                         if (r->cond && !(r->cond & params->flags))
 248                                 continue;
 249                         for (d = 0; r->deps[d] >= 0; d++) {
 250                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 251                                         doit = 1;
 252                                         break;
 253                                 }
 254                         }
 255                         if (!doit)
 256                                 continue;
 257 #ifdef RULES_DEBUG
 258                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 259                         if (r->var >= 0) {
 260                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 261                                 if (hw_is_mask(r->var)) {
 262                                         m = hw_param_mask(params, r->var);
 263                                         printk("%x", *m->bits);
 264                                 } else {
 265                                         i = hw_param_interval(params, r->var);
 266                                         if (i->empty)
 267                                                 printk("empty");
 268                                         else
 269                                                 printk("%c%u %u%c",
 270                                                        i->openmin ? '(' : '[', i->min,
 271                                                        i->max, i->openmax ? ')' : ']');
 272                                 }
 273                         }
 274 #endif
 275                         changed = r->func(params, r);
 276 #ifdef RULES_DEBUG
 277                         if (r->var >= 0) {
 278                                 printk(" -> ");
 279                                 if (hw_is_mask(r->var))
 280                                         printk("%x", *m->bits);
 281                                 else {
 282                                         if (i->empty)
 283                                                 printk("empty");
 284                                         else
 285                                                 printk("%c%u %u%c",
 286                                                        i->openmin ? '(' : '[', i->min,
 287                                                        i->max, i->openmax ? ')' : ']');
 288                                 }
 289                         }
 290                         printk("\n");
 291 #endif
 292                         rstamps[k] = stamp;
 293                         if (changed && r->var >= 0) {
 294                                 params->cmask |= (1 << r->var);
 295                                 vstamps[r->var] = stamp;
 296                                 again = 1;
 297                         }
 298                         if (changed < 0)
 299                                 return changed;
 300                         stamp++;
 301                 }
 302         } while (again);
 303         if (!params->msbits) {
 304                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 305                 if (snd_interval_single(i))
 306                         params->msbits = snd_interval_value(i);
 307         }
 308
 309         if (!params->rate_den) {
 310                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 311                 if (snd_interval_single(i)) {
 312                         params->rate_num = snd_interval_value(i);
 313                         params->rate_den = 1;
 314                 }
 315         }
 316
 317         hw = &substream->runtime->hw;
 318         if (!params->info)
 319                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 320         if (!params->fifo_size) {
 321                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 322                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 323                 if (snd_mask_min(m) == snd_mask_max(m) &&
 324                     snd_interval_min(i) == snd_interval_max(i)) {
 325                         changed = substream->ops->ioctl(substream,
 326                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 327                         if (changed < 0)
 328                                 return changed;
 329                 }
 330         }
 331         params->rmask = 0;
 332         return 0;
 333 }
 334
 335 EXPORT_SYMBOL(snd_pcm_hw_refine);
 336
 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 338                                   struct snd_pcm_hw_params __user * _params)
 339 {
 340         struct snd_pcm_hw_params *params;
 341         int err;
 342
 343         params = memdup_user(_params, sizeof(*params));
 344         if (IS_ERR(params))
 345                 return PTR_ERR(params);
 346
 347         err = snd_pcm_hw_refine(substream, params);
 348         if (copy_to_user(_params, params, sizeof(*params))) {
 349                 if (!err)
 350                         err = -EFAULT;
 351         }
 352
 353         kfree(params);
 354         return err;
 355 }
 356
 357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 358 {
 359         int usecs;
 360
 361         if (! runtime->rate)
 362                 return -1; /* invalid */
 363
 364         /* take 75% of period time as the deadline */
 365         usecs = (750000 / runtime->rate) * runtime->period_size;
 366         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 367                 runtime->rate;
 368
 369         return usecs;
 370 }
 371
 372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 373 {
 374         snd_pcm_stream_lock_irq(substream);
 375         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 376                 substream->runtime->status->state = state;
 377         snd_pcm_stream_unlock_irq(substream);
 378 }
 379
 380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 381                              struct snd_pcm_hw_params *params)
 382 {
 383         struct snd_pcm_runtime *runtime;
 384         int err, usecs;
 385         unsigned int bits;
 386         snd_pcm_uframes_t frames;
 387
 388         if (PCM_RUNTIME_CHECK(substream))
 389                 return -ENXIO;
 390         runtime = substream->runtime;
 391         snd_pcm_stream_lock_irq(substream);
 392         switch (runtime->status->state) {
 393         case SNDRV_PCM_STATE_OPEN:
 394         case SNDRV_PCM_STATE_SETUP:
 395         case SNDRV_PCM_STATE_PREPARED:
 396                 break;
 397         default:
 398                 snd_pcm_stream_unlock_irq(substream);
 399                 return -EBADFD;
 400         }
 401         snd_pcm_stream_unlock_irq(substream);
 402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 403         if (!substream->oss.oss)
 404 #endif
 405                 if (atomic_read(&substream->mmap_count))
 406                         return -EBADFD;
 407
 408         params->rmask = ~0U;
 409         err = snd_pcm_hw_refine(substream, params);
 410         if (err < 0)
 411                 goto _error;
 412
 413         err = snd_pcm_hw_params_choose(substream, params);
 414         if (err < 0)
 415                 goto _error;
 416
 417         if (substream->ops->hw_params != NULL) {
 418                 err = substream->ops->hw_params(substream, params);
 419                 if (err < 0)
 420                         goto _error;
 421         }
 422
 423         runtime->access = params_access(params);
 424         runtime->format = params_format(params);
 425         runtime->subformat = params_subformat(params);
 426         runtime->channels = params_channels(params);
 427         runtime->rate = params_rate(params);
 428         runtime->period_size = params_period_size(params);
 429         runtime->periods = params_periods(params);
 430         runtime->buffer_size = params_buffer_size(params);
 431         runtime->info = params->info;
 432         runtime->rate_num = params->rate_num;
 433         runtime->rate_den = params->rate_den;
 434         runtime->no_period_wakeup =
 435                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 436                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 437
 438         bits = snd_pcm_format_physical_width(runtime->format);
 439         runtime->sample_bits = bits;
 440         bits *= runtime->channels;
 441         runtime->frame_bits = bits;
 442         frames = 1;
 443         while (bits % 8 != 0) {
 444                 bits *= 2;
 445                 frames *= 2;
 446         }
 447         runtime->byte_align = bits / 8;
 448         runtime->min_align = frames;
 449
 450         /* Default sw params */
 451         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 452         runtime->period_step = 1;
 453         runtime->control->avail_min = runtime->period_size;
 454         runtime->start_threshold = 1;
 455         runtime->stop_threshold = runtime->buffer_size;
 456         runtime->silence_threshold = 0;
 457         runtime->silence_size = 0;
 458         runtime->boundary = runtime->buffer_size;
 459         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 460                 runtime->boundary *= 2;
 461
 462         snd_pcm_timer_resolution_change(substream);
 463         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 464
 465         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 466                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 467         if ((usecs = period_to_usecs(runtime)) >= 0)
 468                 pm_qos_add_request(&substream->latency_pm_qos_req,
 469                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 470         return 0;
 471  _error:
 472         /* hardware might be unusable from this time,
 473            so we force application to retry to set
 474            the correct hardware parameter settings */
 475         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 476         if (substream->ops->hw_free != NULL)
 477                 substream->ops->hw_free(substream);
 478         return err;
 479 }
 480
 481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 482                                   struct snd_pcm_hw_params __user * _params)
 483 {
 484         struct snd_pcm_hw_params *params;
 485         int err;
 486
 487         params = memdup_user(_params, sizeof(*params));
 488         if (IS_ERR(params))
 489                 return PTR_ERR(params);
 490
 491         err = snd_pcm_hw_params(substream, params);
 492         if (copy_to_user(_params, params, sizeof(*params))) {
 493                 if (!err)
 494                         err = -EFAULT;
 495         }
 496
 497         kfree(params);
 498         return err;
 499 }
 500
 501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 502 {
 503         struct snd_pcm_runtime *runtime;
 504         int result = 0;
 505
 506         if (PCM_RUNTIME_CHECK(substream))
 507                 return -ENXIO;
 508         runtime = substream->runtime;
 509         snd_pcm_stream_lock_irq(substream);
 510         switch (runtime->status->state) {
 511         case SNDRV_PCM_STATE_SETUP:
 512         case SNDRV_PCM_STATE_PREPARED:
 513                 break;
 514         default:
 515                 snd_pcm_stream_unlock_irq(substream);
 516                 return -EBADFD;
 517         }
 518         snd_pcm_stream_unlock_irq(substream);
 519         if (atomic_read(&substream->mmap_count))
 520                 return -EBADFD;
 521         if (substream->ops->hw_free)
 522                 result = substream->ops->hw_free(substream);
 523         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 524         pm_qos_remove_request(&substream->latency_pm_qos_req);
 525         return result;
 526 }
 527
 528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 529                              struct snd_pcm_sw_params *params)
 530 {
 531         struct snd_pcm_runtime *runtime;
 532         int err;
 533
 534         if (PCM_RUNTIME_CHECK(substream))
 535                 return -ENXIO;
 536         runtime = substream->runtime;
 537         snd_pcm_stream_lock_irq(substream);
 538         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 539                 snd_pcm_stream_unlock_irq(substream);
 540                 return -EBADFD;
 541         }
 542         snd_pcm_stream_unlock_irq(substream);
 543
 544         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 545                 return -EINVAL;
 546         if (params->avail_min == 0)
 547                 return -EINVAL;
 548         if (params->silence_size >= runtime->boundary) {
 549                 if (params->silence_threshold != 0)
 550                         return -EINVAL;
 551         } else {
 552                 if (params->silence_size > params->silence_threshold)
 553                         return -EINVAL;
 554                 if (params->silence_threshold > runtime->buffer_size)
 555                         return -EINVAL;
 556         }
 557         err = 0;
 558         snd_pcm_stream_lock_irq(substream);
 559         runtime->tstamp_mode = params->tstamp_mode;
 560         runtime->period_step = params->period_step;
 561         runtime->control->avail_min = params->avail_min;
 562         runtime->start_threshold = params->start_threshold;
 563         runtime->stop_threshold = params->stop_threshold;
 564         runtime->silence_threshold = params->silence_threshold;
 565         runtime->silence_size = params->silence_size;
 566         params->boundary = runtime->boundary;
 567         if (snd_pcm_running(substream)) {
 568                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 569                     runtime->silence_size > 0)
 570                         snd_pcm_playback_silence(substream, ULONG_MAX);
 571                 err = snd_pcm_update_state(substream, runtime);
 572         }
 573         snd_pcm_stream_unlock_irq(substream);
 574         return err;
 575 }
 576
 577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 578                                   struct snd_pcm_sw_params __user * _params)
 579 {
 580         struct snd_pcm_sw_params params;
 581         int err;
 582         if (copy_from_user(&params, _params, sizeof(params)))
 583                 return -EFAULT;
 584         err = snd_pcm_sw_params(substream, &params);
 585         if (copy_to_user(_params, &params, sizeof(params)))
 586                 return -EFAULT;
 587         return err;
 588 }
 589
 590 int snd_pcm_status(struct snd_pcm_substream *substream,
 591                    struct snd_pcm_status *status)
 592 {
 593         struct snd_pcm_runtime *runtime = substream->runtime;
 594
 595         snd_pcm_stream_lock_irq(substream);
 596         status->state = runtime->status->state;
 597         status->suspended_state = runtime->status->suspended_state;
 598         if (status->state == SNDRV_PCM_STATE_OPEN)
 599                 goto _end;
 600         status->trigger_tstamp = runtime->trigger_tstamp;
 601         if (snd_pcm_running(substream)) {
 602                 snd_pcm_update_hw_ptr(substream);
 603                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 604                         status->tstamp = runtime->status->tstamp;
 605                         status->audio_tstamp =
 606                                 runtime->status->audio_tstamp;
 607                         goto _tstamp_end;
 608                 }
 609         }
 610         snd_pcm_gettime(runtime, &status->tstamp);
 611  _tstamp_end:
 612         status->appl_ptr = runtime->control->appl_ptr;
 613         status->hw_ptr = runtime->status->hw_ptr;
 614         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 615                 status->avail = snd_pcm_playback_avail(runtime);
 616                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 617                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 618                         status->delay = runtime->buffer_size - status->avail;
 619                         status->delay += runtime->delay;
 620                 } else
 621                         status->delay = 0;
 622         } else {
 623                 status->avail = snd_pcm_capture_avail(runtime);
 624                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 625                         status->delay = status->avail + runtime->delay;
 626                 else
 627                         status->delay = 0;
 628         }
 629         status->avail_max = runtime->avail_max;
 630         status->overrange = runtime->overrange;
 631         runtime->avail_max = 0;
 632         runtime->overrange = 0;
 633  _end:
 634         snd_pcm_stream_unlock_irq(substream);
 635         return 0;
 636 }
 637
 638 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 639                                struct snd_pcm_status __user * _status)
 640 {
 641         struct snd_pcm_status status;
 642         int res;
 643
 644         memset(&status, 0, sizeof(status));
 645         res = snd_pcm_status(substream, &status);
 646         if (res < 0)
 647                 return res;
 648         if (copy_to_user(_status, &status, sizeof(status)))
 649                 return -EFAULT;
 650         return 0;
 651 }
 652
 653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 654                                 struct snd_pcm_channel_info * info)
 655 {
 656         struct snd_pcm_runtime *runtime;
 657         unsigned int channel;
 658
 659         channel = info->channel;
 660         runtime = substream->runtime;
 661         snd_pcm_stream_lock_irq(substream);
 662         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 663                 snd_pcm_stream_unlock_irq(substream);
 664                 return -EBADFD;
 665         }
 666         snd_pcm_stream_unlock_irq(substream);
 667         if (channel >= runtime->channels)
 668                 return -EINVAL;
 669         memset(info, 0, sizeof(*info));
 670         info->channel = channel;
 671         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 672 }
 673
 674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 675                                      struct snd_pcm_channel_info __user * _info)
 676 {
 677         struct snd_pcm_channel_info info;
 678         int res;
 679
 680         if (copy_from_user(&info, _info, sizeof(info)))
 681                 return -EFAULT;
 682         res = snd_pcm_channel_info(substream, &info);
 683         if (res < 0)
 684                 return res;
 685         if (copy_to_user(_info, &info, sizeof(info)))
 686                 return -EFAULT;
 687         return 0;
 688 }
 689
 690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 691 {
 692         struct snd_pcm_runtime *runtime = substream->runtime;
 693         if (runtime->trigger_master == NULL)
 694                 return;
 695         if (runtime->trigger_master == substream) {
 696                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 697         } else {
 698                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 699                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 700         }
 701         runtime->trigger_master = NULL;
 702 }
 703
 704 struct action_ops {
 705         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 706         int (*do_action)(struct snd_pcm_substream *substream, int state);
 707         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 708         void (*post_action)(struct snd_pcm_substream *substream, int state);
 709 };
 710
 711 /*
 712  *  this functions is core for handling of linked stream
 713  *  Note: the stream state might be changed also on failure
 714  *  Note2: call with calling stream lock + link lock
 715  */
 716 static int snd_pcm_action_group(struct action_ops *ops,
 717                                 struct snd_pcm_substream *substream,
 718                                 int state, int do_lock)
 719 {
 720         struct snd_pcm_substream *s = NULL;
 721         struct snd_pcm_substream *s1;
 722         int res = 0;
 723
 724         snd_pcm_group_for_each_entry(s, substream) {
 725                 if (do_lock && s != substream)
 726                         spin_lock_nested(&s->self_group.lock,
 727                                          SINGLE_DEPTH_NESTING);
 728                 res = ops->pre_action(s, state);
 729                 if (res < 0)
 730                         goto _unlock;
 731         }
 732         snd_pcm_group_for_each_entry(s, substream) {
 733                 res = ops->do_action(s, state);
 734                 if (res < 0) {
 735                         if (ops->undo_action) {
 736                                 snd_pcm_group_for_each_entry(s1, substream) {
 737                                         if (s1 == s) /* failed stream */
 738                                                 break;
 739                                         ops->undo_action(s1, state);
 740                                 }
 741                         }
 742                         s = NULL; /* unlock all */
 743                         goto _unlock;
 744                 }
 745         }
 746         snd_pcm_group_for_each_entry(s, substream) {
 747                 ops->post_action(s, state);
 748         }
 749  _unlock:
 750         if (do_lock) {
 751                 /* unlock streams */
 752                 snd_pcm_group_for_each_entry(s1, substream) {
 753                         if (s1 != substream)
 754                                 spin_unlock(&s1->self_group.lock);
 755                         if (s1 == s)    /* end */
 756                                 break;
 757                 }
 758         }
 759         return res;
 760 }
 761
 762 /*
 763  *  Note: call with stream lock
 764  */
 765 static int snd_pcm_action_single(struct action_ops *ops,
 766                                  struct snd_pcm_substream *substream,
 767                                  int state)
 768 {
 769         int res;
 770
 771         res = ops->pre_action(substream, state);
 772         if (res < 0)
 773                 return res;
 774         res = ops->do_action(substream, state);
 775         if (res == 0)
 776                 ops->post_action(substream, state);
 777         else if (ops->undo_action)
 778                 ops->undo_action(substream, state);
 779         return res;
 780 }
 781
 782 /*
 783  *  Note: call with stream lock
 784  */
 785 static int snd_pcm_action(struct action_ops *ops,
 786                           struct snd_pcm_substream *substream,
 787                           int state)
 788 {
 789         int res;
 790
 791         if (snd_pcm_stream_linked(substream)) {
 792                 if (!spin_trylock(&substream->group->lock)) {
 793                         spin_unlock(&substream->self_group.lock);
 794                         spin_lock(&substream->group->lock);
 795                         spin_lock(&substream->self_group.lock);
 796                 }
 797                 res = snd_pcm_action_group(ops, substream, state, 1);
 798                 spin_unlock(&substream->group->lock);
 799         } else {
 800                 res = snd_pcm_action_single(ops, substream, state);
 801         }
 802         return res;
 803 }
 804
 805 /*
 806  *  Note: don't use any locks before
 807  */
 808 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 809                                    struct snd_pcm_substream *substream,
 810                                    int state)
 811 {
 812         int res;
 813
 814         read_lock_irq(&snd_pcm_link_rwlock);
 815         if (snd_pcm_stream_linked(substream)) {
 816                 spin_lock(&substream->group->lock);
 817                 spin_lock(&substream->self_group.lock);
 818                 res = snd_pcm_action_group(ops, substream, state, 1);
 819                 spin_unlock(&substream->self_group.lock);
 820                 spin_unlock(&substream->group->lock);
 821         } else {
 822                 spin_lock(&substream->self_group.lock);
 823                 res = snd_pcm_action_single(ops, substream, state);
 824                 spin_unlock(&substream->self_group.lock);
 825         }
 826         read_unlock_irq(&snd_pcm_link_rwlock);
 827         return res;
 828 }
 829
 830 /*
 831  */
 832 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 833                                     struct snd_pcm_substream *substream,
 834                                     int state)
 835 {
 836         int res;
 837
 838         down_read(&snd_pcm_link_rwsem);
 839         if (snd_pcm_stream_linked(substream))
 840                 res = snd_pcm_action_group(ops, substream, state, 0);
 841         else
 842                 res = snd_pcm_action_single(ops, substream, state);
 843         up_read(&snd_pcm_link_rwsem);
 844         return res;
 845 }
 846
 847 /*
 848  * start callbacks
 849  */
 850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 851 {
 852         struct snd_pcm_runtime *runtime = substream->runtime;
 853         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 854                 return -EBADFD;
 855         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 856             !snd_pcm_playback_data(substream))
 857                 return -EPIPE;
 858         runtime->trigger_master = substream;
 859         return 0;
 860 }
 861
 862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 863 {
 864         if (substream->runtime->trigger_master != substream)
 865                 return 0;
 866         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 867 }
 868
 869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 870 {
 871         if (substream->runtime->trigger_master == substream)
 872                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 873 }
 874
 875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 876 {
 877         struct snd_pcm_runtime *runtime = substream->runtime;
 878         snd_pcm_trigger_tstamp(substream);
 879         runtime->hw_ptr_jiffies = jiffies;
 880         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 881                                                             runtime->rate;
 882         runtime->status->state = state;
 883         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 884             runtime->silence_size > 0)
 885                 snd_pcm_playback_silence(substream, ULONG_MAX);
 886         if (substream->timer)
 887                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 888                                  &runtime->trigger_tstamp);
 889 }
 890
 891 static struct action_ops snd_pcm_action_start = {
 892         .pre_action = snd_pcm_pre_start,
 893         .do_action = snd_pcm_do_start,
 894         .undo_action = snd_pcm_undo_start,
 895         .post_action = snd_pcm_post_start
 896 };
 897
 898 /**
 899  * snd_pcm_start - start all linked streams
 900  * @substream: the PCM substream instance
 901  *
 902  * 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 succesful, 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                         } else {
1408                                 runtime->status->state = SNDRV_PCM_STATE_SETUP;
1409                         }
1410                         break;
1411                 case SNDRV_PCM_STATE_RUNNING:
1412                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1413                         break;
1414                 case SNDRV_PCM_STATE_XRUN:
1415                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1416                         break;
1417                 default:
1418                         break;
1419                 }
1420         } else {
1421                 /* stop running stream */
1422                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1423                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1424                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1425                         snd_pcm_do_stop(substream, new_state);
1426                         snd_pcm_post_stop(substream, new_state);
1427                 }
1428         }
1429         return 0;
1430 }
1431
1432 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1433 {
1434 }
1435
1436 static struct action_ops snd_pcm_action_drain_init = {
1437         .pre_action = snd_pcm_pre_drain_init,
1438         .do_action = snd_pcm_do_drain_init,
1439         .post_action = snd_pcm_post_drain_init
1440 };
1441
1442 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1443
1444 /*
1445  * Drain the stream(s).
1446  * When the substream is linked, sync until the draining of all playback streams
1447  * is finished.
1448  * After this call, all streams are supposed to be either SETUP or DRAINING
1449  * (capture only) state.
1450  */
1451 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1452                          struct file *file)
1453 {
1454         struct snd_card *card;
1455         struct snd_pcm_runtime *runtime;
1456         struct snd_pcm_substream *s;
1457         wait_queue_t wait;
1458         int result = 0;
1459         int nonblock = 0;
1460
1461         card = substream->pcm->card;
1462         runtime = substream->runtime;
1463
1464         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1465                 return -EBADFD;
1466
1467         snd_power_lock(card);
1468         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1469                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1470                 if (result < 0) {
1471                         snd_power_unlock(card);
1472                         return result;
1473                 }
1474         }
1475
1476         if (file) {
1477                 if (file->f_flags & O_NONBLOCK)
1478                         nonblock = 1;
1479         } else if (substream->f_flags & O_NONBLOCK)
1480                 nonblock = 1;
1481
1482         down_read(&snd_pcm_link_rwsem);
1483         snd_pcm_stream_lock_irq(substream);
1484         /* resume pause */
1485         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1486                 snd_pcm_pause(substream, 0);
1487
1488         /* pre-start/stop - all running streams are changed to DRAINING state */
1489         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1490         if (result < 0)
1491                 goto unlock;
1492         /* in non-blocking, we don't wait in ioctl but let caller poll */
1493         if (nonblock) {
1494                 result = -EAGAIN;
1495                 goto unlock;
1496         }
1497
1498         for (;;) {
1499                 long tout;
1500                 struct snd_pcm_runtime *to_check;
1501                 if (signal_pending(current)) {
1502                         result = -ERESTARTSYS;
1503                         break;
1504                 }
1505                 /* find a substream to drain */
1506                 to_check = NULL;
1507                 snd_pcm_group_for_each_entry(s, substream) {
1508                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1509                                 continue;
1510                         runtime = s->runtime;
1511                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1512                                 to_check = runtime;
1513                                 break;
1514                         }
1515                 }
1516                 if (!to_check)
1517                         break; /* all drained */
1518                 init_waitqueue_entry(&wait, current);
1519                 add_wait_queue(&to_check->sleep, &wait);
1520                 snd_pcm_stream_unlock_irq(substream);
1521                 up_read(&snd_pcm_link_rwsem);
1522                 snd_power_unlock(card);
1523                 if (runtime->no_period_wakeup)
1524                         tout = MAX_SCHEDULE_TIMEOUT;
1525                 else {
1526                         tout = 10;
1527                         if (runtime->rate) {
1528                                 long t = runtime->period_size * 2 / runtime->rate;
1529                                 tout = max(t, tout);
1530                         }
1531                         tout = msecs_to_jiffies(tout * 1000);
1532                 }
1533                 tout = schedule_timeout_interruptible(tout);
1534                 snd_power_lock(card);
1535                 down_read(&snd_pcm_link_rwsem);
1536                 snd_pcm_stream_lock_irq(substream);
1537                 remove_wait_queue(&to_check->sleep, &wait);
1538                 if (card->shutdown) {
1539                         result = -ENODEV;
1540                         break;
1541                 }
1542                 if (tout == 0) {
1543                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1544                                 result = -ESTRPIPE;
1545                         else {
1546                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1547                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1548                                 result = -EIO;
1549                         }
1550                         break;
1551                 }
1552         }
1553
1554  unlock:
1555         snd_pcm_stream_unlock_irq(substream);
1556         up_read(&snd_pcm_link_rwsem);
1557         snd_power_unlock(card);
1558
1559         return result;
1560 }
1561
1562 /*
1563  * drop ioctl
1564  *
1565  * Immediately put all linked substreams into SETUP state.
1566  */
1567 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1568 {
1569         struct snd_pcm_runtime *runtime;
1570         int result = 0;
1571
1572         if (PCM_RUNTIME_CHECK(substream))
1573                 return -ENXIO;
1574         runtime = substream->runtime;
1575
1576         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1577             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1578             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1579                 return -EBADFD;
1580
1581         snd_pcm_stream_lock_irq(substream);
1582         /* resume pause */
1583         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1584                 snd_pcm_pause(substream, 0);
1585
1586         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1587         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1588         snd_pcm_stream_unlock_irq(substream);
1589
1590         return result;
1591 }
1592
1593
1594 /* WARNING: Don't forget to fput back the file */
1595 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1596 {
1597         struct file *file;
1598         struct inode *inode;
1599         unsigned int minor;
1600
1601         file = fget_light(fd, fput_needed);
1602         if (!file)
1603                 return NULL;
1604         inode = file_inode(file);
1605         if (!S_ISCHR(inode->i_mode) ||
1606             imajor(inode) != snd_major) {
1607                 fput_light(file, *fput_needed);
1608                 return NULL;
1609         }
1610         minor = iminor(inode);
1611         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1612             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1613                 fput_light(file, *fput_needed);
1614                 return NULL;
1615         }
1616         return file;
1617 }
1618
1619 /*
1620  * PCM link handling
1621  */
1622 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1623 {
1624         int res = 0;
1625         struct file *file;
1626         struct snd_pcm_file *pcm_file;
1627         struct snd_pcm_substream *substream1;
1628         struct snd_pcm_group *group;
1629         int fput_needed;
1630
1631         file = snd_pcm_file_fd(fd, &fput_needed);
1632         if (!file)
1633                 return -EBADFD;
1634         pcm_file = file->private_data;
1635         substream1 = pcm_file->substream;
1636         group = kmalloc(sizeof(*group), GFP_KERNEL);
1637         if (!group) {
1638                 res = -ENOMEM;
1639                 goto _nolock;
1640         }
1641         down_write(&snd_pcm_link_rwsem);
1642         write_lock_irq(&snd_pcm_link_rwlock);
1643         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1644             substream->runtime->status->state != substream1->runtime->status->state) {
1645                 res = -EBADFD;
1646                 goto _end;
1647         }
1648         if (snd_pcm_stream_linked(substream1)) {
1649                 res = -EALREADY;
1650                 goto _end;
1651         }
1652         if (!snd_pcm_stream_linked(substream)) {
1653                 substream->group = group;
1654                 group = NULL;
1655                 spin_lock_init(&substream->group->lock);
1656                 INIT_LIST_HEAD(&substream->group->substreams);
1657                 list_add_tail(&substream->link_list, &substream->group->substreams);
1658                 substream->group->count = 1;
1659         }
1660         list_add_tail(&substream1->link_list, &substream->group->substreams);
1661         substream->group->count++;
1662         substream1->group = substream->group;
1663  _end:
1664         write_unlock_irq(&snd_pcm_link_rwlock);
1665         up_write(&snd_pcm_link_rwsem);
1666  _nolock:
1667         snd_card_unref(substream1->pcm->card);
1668         fput_light(file, fput_needed);
1669         kfree(group);
1670         return res;
1671 }
1672
1673 static void relink_to_local(struct snd_pcm_substream *substream)
1674 {
1675         substream->group = &substream->self_group;
1676         INIT_LIST_HEAD(&substream->self_group.substreams);
1677         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1678 }
1679
1680 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1681 {
1682         struct snd_pcm_substream *s;
1683         int res = 0;
1684
1685         down_write(&snd_pcm_link_rwsem);
1686         write_lock_irq(&snd_pcm_link_rwlock);
1687         if (!snd_pcm_stream_linked(substream)) {
1688                 res = -EALREADY;
1689                 goto _end;
1690         }
1691         list_del(&substream->link_list);
1692         substream->group->count--;
1693         if (substream->group->count == 1) {     /* detach the last stream, too */
1694                 snd_pcm_group_for_each_entry(s, substream) {
1695                         relink_to_local(s);
1696                         break;
1697                 }
1698                 kfree(substream->group);
1699         }
1700         relink_to_local(substream);
1701        _end:
1702         write_unlock_irq(&snd_pcm_link_rwlock);
1703         up_write(&snd_pcm_link_rwsem);
1704         return res;
1705 }
1706
1707 /*
1708  * hw configurator
1709  */
1710 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1711                                struct snd_pcm_hw_rule *rule)
1712 {
1713         struct snd_interval t;
1714         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1715                      hw_param_interval_c(params, rule->deps[1]), &t);
1716         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1717 }
1718
1719 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1720                                struct snd_pcm_hw_rule *rule)
1721 {
1722         struct snd_interval t;
1723         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1724                      hw_param_interval_c(params, rule->deps[1]), &t);
1725         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1726 }
1727
1728 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1729                                    struct snd_pcm_hw_rule *rule)
1730 {
1731         struct snd_interval t;
1732         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1733                          hw_param_interval_c(params, rule->deps[1]),
1734                          (unsigned long) rule->private, &t);
1735         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1736 }
1737
1738 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1739                                    struct snd_pcm_hw_rule *rule)
1740 {
1741         struct snd_interval t;
1742         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1743                          (unsigned long) rule->private,
1744                          hw_param_interval_c(params, rule->deps[1]), &t);
1745         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1746 }
1747
1748 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1749                                   struct snd_pcm_hw_rule *rule)
1750 {
1751         unsigned int k;
1752         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1753         struct snd_mask m;
1754         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1755         snd_mask_any(&m);
1756         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1757                 int bits;
1758                 if (! snd_mask_test(mask, k))
1759                         continue;
1760                 bits = snd_pcm_format_physical_width(k);
1761                 if (bits <= 0)
1762                         continue; /* ignore invalid formats */
1763                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1764                         snd_mask_reset(&m, k);
1765         }
1766         return snd_mask_refine(mask, &m);
1767 }
1768
1769 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1770                                        struct snd_pcm_hw_rule *rule)
1771 {
1772         struct snd_interval t;
1773         unsigned int k;
1774         t.min = UINT_MAX;
1775         t.max = 0;
1776         t.openmin = 0;
1777         t.openmax = 0;
1778         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1779                 int bits;
1780                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1781                         continue;
1782                 bits = snd_pcm_format_physical_width(k);
1783                 if (bits <= 0)
1784                         continue; /* ignore invalid formats */
1785                 if (t.min > (unsigned)bits)
1786                         t.min = bits;
1787                 if (t.max < (unsigned)bits)
1788                         t.max = bits;
1789         }
1790         t.integer = 1;
1791         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1792 }
1793
1794 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1795 #error "Change this table"
1796 #endif
1797
1798 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1799                                  48000, 64000, 88200, 96000, 176400, 192000 };
1800
1801 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1802         .count = ARRAY_SIZE(rates),
1803         .list = rates,
1804 };
1805
1806 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1807                                 struct snd_pcm_hw_rule *rule)
1808 {
1809         struct snd_pcm_hardware *hw = rule->private;
1810         return snd_interval_list(hw_param_interval(params, rule->var),
1811                                  snd_pcm_known_rates.count,
1812                                  snd_pcm_known_rates.list, hw->rates);
1813 }
1814
1815 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1816                                             struct snd_pcm_hw_rule *rule)
1817 {
1818         struct snd_interval t;
1819         struct snd_pcm_substream *substream = rule->private;
1820         t.min = 0;
1821         t.max = substream->buffer_bytes_max;
1822         t.openmin = 0;
1823         t.openmax = 0;
1824         t.integer = 1;
1825         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1826 }
1827
1828 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1829 {
1830         struct snd_pcm_runtime *runtime = substream->runtime;
1831         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1832         int k, err;
1833
1834         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1835                 snd_mask_any(constrs_mask(constrs, k));
1836         }
1837
1838         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1839                 snd_interval_any(constrs_interval(constrs, k));
1840         }
1841
1842         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1843         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1844         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1845         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1846         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1847
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1849                                    snd_pcm_hw_rule_format, NULL,
1850                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1854                                   snd_pcm_hw_rule_sample_bits, NULL,
1855                                   SNDRV_PCM_HW_PARAM_FORMAT,
1856                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1857         if (err < 0)
1858                 return err;
1859         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1860                                   snd_pcm_hw_rule_div, NULL,
1861                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1862         if (err < 0)
1863                 return err;
1864         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1865                                   snd_pcm_hw_rule_mul, NULL,
1866                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1867         if (err < 0)
1868                 return err;
1869         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1870                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1871                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1872         if (err < 0)
1873                 return err;
1874         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1875                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1876                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1877         if (err < 0)
1878                 return err;
1879         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1880                                   snd_pcm_hw_rule_div, NULL,
1881                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1882         if (err < 0)
1883                 return err;
1884         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1885                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1886                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1887         if (err < 0)
1888                 return err;
1889         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1890                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1891                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1892         if (err < 0)
1893                 return err;
1894         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1895                                   snd_pcm_hw_rule_div, NULL,
1896                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1897         if (err < 0)
1898                 return err;
1899         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1900                                   snd_pcm_hw_rule_div, NULL,
1901                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1902         if (err < 0)
1903                 return err;
1904         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1905                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1906                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1907         if (err < 0)
1908                 return err;
1909         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1910                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1911                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1912         if (err < 0)
1913                 return err;
1914         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1915                                   snd_pcm_hw_rule_mul, NULL,
1916                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1917         if (err < 0)
1918                 return err;
1919         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1920                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1921                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1922         if (err < 0)
1923                 return err;
1924         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1925                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1926                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1927         if (err < 0)
1928                 return err;
1929         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1930                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1931                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1932         if (err < 0)
1933                 return err;
1934         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1935                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1936                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1937         if (err < 0)
1938                 return err;
1939         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1940                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1941                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1942         if (err < 0)
1943                 return err;
1944         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1945                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1946                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1947         if (err < 0)
1948                 return err;
1949         return 0;
1950 }
1951
1952 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1953 {
1954         struct snd_pcm_runtime *runtime = substream->runtime;
1955         struct snd_pcm_hardware *hw = &runtime->hw;
1956         int err;
1957         unsigned int mask = 0;
1958
1959         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1960                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1961         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1962                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1963         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1964                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1965                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1966                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1967                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1968                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1969                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1970         }
1971         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1972         if (err < 0)
1973                 return err;
1974
1975         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1976         if (err < 0)
1977                 return err;
1978
1979         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1980         if (err < 0)
1981                 return err;
1982
1983         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1984                                            hw->channels_min, hw->channels_max);
1985         if (err < 0)
1986                 return err;
1987
1988         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1989                                            hw->rate_min, hw->rate_max);
1990         if (err < 0)
1991                 return err;
1992
1993         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1994                                            hw->period_bytes_min, hw->period_bytes_max);
1995         if (err < 0)
1996                 return err;
1997
1998         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1999                                            hw->periods_min, hw->periods_max);
2000         if (err < 0)
2001                 return err;
2002
2003         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2004                                            hw->period_bytes_min, hw->buffer_bytes_max);
2005         if (err < 0)
2006                 return err;
2007
2008         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2009                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2010                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2011         if (err < 0)
2012                 return err;
2013
2014         /* FIXME: remove */
2015         if (runtime->dma_bytes) {
2016                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2017                 if (err < 0)
2018                         return err;
2019         }
2020
2021         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2022                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2023                                           snd_pcm_hw_rule_rate, hw,
2024                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2025                 if (err < 0)
2026                         return err;
2027         }
2028
2029         /* FIXME: this belong to lowlevel */
2030         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2031
2032         return 0;
2033 }
2034
2035 static void pcm_release_private(struct snd_pcm_substream *substream)
2036 {
2037         snd_pcm_unlink(substream);
2038 }
2039
2040 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2041 {
2042         substream->ref_count--;
2043         if (substream->ref_count > 0)
2044                 return;
2045
2046         snd_pcm_drop(substream);
2047         if (substream->hw_opened) {
2048                 if (substream->ops->hw_free != NULL)
2049                         substream->ops->hw_free(substream);
2050                 substream->ops->close(substream);
2051                 substream->hw_opened = 0;
2052         }
2053         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2054                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2055         if (substream->pcm_release) {
2056                 substream->pcm_release(substream);
2057                 substream->pcm_release = NULL;
2058         }
2059         snd_pcm_detach_substream(substream);
2060 }
2061
2062 EXPORT_SYMBOL(snd_pcm_release_substream);
2063
2064 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2065                            struct file *file,
2066                            struct snd_pcm_substream **rsubstream)
2067 {
2068         struct snd_pcm_substream *substream;
2069         int err;
2070
2071         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2072         if (err < 0)
2073                 return err;
2074         if (substream->ref_count > 1) {
2075                 *rsubstream = substream;
2076                 return 0;
2077         }
2078
2079         err = snd_pcm_hw_constraints_init(substream);
2080         if (err < 0) {
2081                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2082                 goto error;
2083         }
2084
2085         if ((err = substream->ops->open(substream)) < 0)
2086                 goto error;
2087
2088         substream->hw_opened = 1;
2089
2090         err = snd_pcm_hw_constraints_complete(substream);
2091         if (err < 0) {
2092                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2093                 goto error;
2094         }
2095
2096         *rsubstream = substream;
2097         return 0;
2098
2099  error:
2100         snd_pcm_release_substream(substream);
2101         return err;
2102 }
2103
2104 EXPORT_SYMBOL(snd_pcm_open_substream);
2105
2106 static int snd_pcm_open_file(struct file *file,
2107                              struct snd_pcm *pcm,
2108                              int stream)
2109 {
2110         struct snd_pcm_file *pcm_file;
2111         struct snd_pcm_substream *substream;
2112         int err;
2113
2114         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2115         if (err < 0)
2116                 return err;
2117
2118         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2119         if (pcm_file == NULL) {
2120                 snd_pcm_release_substream(substream);
2121                 return -ENOMEM;
2122         }
2123         pcm_file->substream = substream;
2124         if (substream->ref_count == 1) {
2125                 substream->file = pcm_file;
2126                 substream->pcm_release = pcm_release_private;
2127         }
2128         file->private_data = pcm_file;
2129
2130         return 0;
2131 }
2132
2133 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2134 {
2135         struct snd_pcm *pcm;
2136         int err = nonseekable_open(inode, file);
2137         if (err < 0)
2138                 return err;
2139         pcm = snd_lookup_minor_data(iminor(inode),
2140                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2141         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2142         if (pcm)
2143                 snd_card_unref(pcm->card);
2144         return err;
2145 }
2146
2147 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2148 {
2149         struct snd_pcm *pcm;
2150         int err = nonseekable_open(inode, file);
2151         if (err < 0)
2152                 return err;
2153         pcm = snd_lookup_minor_data(iminor(inode),
2154                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2155         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2156         if (pcm)
2157                 snd_card_unref(pcm->card);
2158         return err;
2159 }
2160
2161 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2162 {
2163         int err;
2164         wait_queue_t wait;
2165
2166         if (pcm == NULL) {
2167                 err = -ENODEV;
2168                 goto __error1;
2169         }
2170         err = snd_card_file_add(pcm->card, file);
2171         if (err < 0)
2172                 goto __error1;
2173         if (!try_module_get(pcm->card->module)) {
2174                 err = -EFAULT;
2175                 goto __error2;
2176         }
2177         init_waitqueue_entry(&wait, current);
2178         add_wait_queue(&pcm->open_wait, &wait);
2179         mutex_lock(&pcm->open_mutex);
2180         while (1) {
2181                 err = snd_pcm_open_file(file, pcm, stream);
2182                 if (err >= 0)
2183                         break;
2184                 if (err == -EAGAIN) {
2185                         if (file->f_flags & O_NONBLOCK) {
2186                                 err = -EBUSY;
2187                                 break;
2188                         }
2189                 } else
2190                         break;
2191                 set_current_state(TASK_INTERRUPTIBLE);
2192                 mutex_unlock(&pcm->open_mutex);
2193                 schedule();
2194                 mutex_lock(&pcm->open_mutex);
2195                 if (pcm->card->shutdown) {
2196                         err = -ENODEV;
2197                         break;
2198                 }
2199                 if (signal_pending(current)) {
2200                         err = -ERESTARTSYS;
2201                         break;
2202                 }
2203         }
2204         remove_wait_queue(&pcm->open_wait, &wait);
2205         mutex_unlock(&pcm->open_mutex);
2206         if (err < 0)
2207                 goto __error;
2208         return err;
2209
2210       __error:
2211         module_put(pcm->card->module);
2212       __error2:
2213         snd_card_file_remove(pcm->card, file);
2214       __error1:
2215         return err;
2216 }
2217
2218 static int snd_pcm_release(struct inode *inode, struct file *file)
2219 {
2220         struct snd_pcm *pcm;
2221         struct snd_pcm_substream *substream;
2222         struct snd_pcm_file *pcm_file;
2223
2224         pcm_file = file->private_data;
2225         substream = pcm_file->substream;
2226         if (snd_BUG_ON(!substream))
2227                 return -ENXIO;
2228         pcm = substream->pcm;
2229         mutex_lock(&pcm->open_mutex);
2230         snd_pcm_release_substream(substream);
2231         kfree(pcm_file);
2232         mutex_unlock(&pcm->open_mutex);
2233         wake_up(&pcm->open_wait);
2234         module_put(pcm->card->module);
2235         snd_card_file_remove(pcm->card, file);
2236         return 0;
2237 }
2238
2239 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2240                                                  snd_pcm_uframes_t frames)
2241 {
2242         struct snd_pcm_runtime *runtime = substream->runtime;
2243         snd_pcm_sframes_t appl_ptr;
2244         snd_pcm_sframes_t ret;
2245         snd_pcm_sframes_t hw_avail;
2246
2247         if (frames == 0)
2248                 return 0;
2249
2250         snd_pcm_stream_lock_irq(substream);
2251         switch (runtime->status->state) {
2252         case SNDRV_PCM_STATE_PREPARED:
2253                 break;
2254         case SNDRV_PCM_STATE_DRAINING:
2255         case SNDRV_PCM_STATE_RUNNING:
2256                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2257                         break;
2258                 /* Fall through */
2259         case SNDRV_PCM_STATE_XRUN:
2260                 ret = -EPIPE;
2261                 goto __end;
2262         case SNDRV_PCM_STATE_SUSPENDED:
2263                 ret = -ESTRPIPE;
2264                 goto __end;
2265         default:
2266                 ret = -EBADFD;
2267                 goto __end;
2268         }
2269
2270         hw_avail = snd_pcm_playback_hw_avail(runtime);
2271         if (hw_avail <= 0) {
2272                 ret = 0;
2273                 goto __end;
2274         }
2275         if (frames > (snd_pcm_uframes_t)hw_avail)
2276                 frames = hw_avail;
2277         appl_ptr = runtime->control->appl_ptr - frames;
2278         if (appl_ptr < 0)
2279                 appl_ptr += runtime->boundary;
2280         runtime->control->appl_ptr = appl_ptr;
2281         ret = frames;
2282  __end:
2283         snd_pcm_stream_unlock_irq(substream);
2284         return ret;
2285 }
2286
2287 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2288                                                 snd_pcm_uframes_t frames)
2289 {
2290         struct snd_pcm_runtime *runtime = substream->runtime;
2291         snd_pcm_sframes_t appl_ptr;
2292         snd_pcm_sframes_t ret;
2293         snd_pcm_sframes_t hw_avail;
2294
2295         if (frames == 0)
2296                 return 0;
2297
2298         snd_pcm_stream_lock_irq(substream);
2299         switch (runtime->status->state) {
2300         case SNDRV_PCM_STATE_PREPARED:
2301         case SNDRV_PCM_STATE_DRAINING:
2302                 break;
2303         case SNDRV_PCM_STATE_RUNNING:
2304                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2305                         break;
2306                 /* Fall through */
2307         case SNDRV_PCM_STATE_XRUN:
2308                 ret = -EPIPE;
2309                 goto __end;
2310         case SNDRV_PCM_STATE_SUSPENDED:
2311                 ret = -ESTRPIPE;
2312                 goto __end;
2313         default:
2314                 ret = -EBADFD;
2315                 goto __end;
2316         }
2317
2318         hw_avail = snd_pcm_capture_hw_avail(runtime);
2319         if (hw_avail <= 0) {
2320                 ret = 0;
2321                 goto __end;
2322         }
2323         if (frames > (snd_pcm_uframes_t)hw_avail)
2324                 frames = hw_avail;
2325         appl_ptr = runtime->control->appl_ptr - frames;
2326         if (appl_ptr < 0)
2327                 appl_ptr += runtime->boundary;
2328         runtime->control->appl_ptr = appl_ptr;
2329         ret = frames;
2330  __end:
2331         snd_pcm_stream_unlock_irq(substream);
2332         return ret;
2333 }
2334
2335 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2336                                                   snd_pcm_uframes_t frames)
2337 {
2338         struct snd_pcm_runtime *runtime = substream->runtime;
2339         snd_pcm_sframes_t appl_ptr;
2340         snd_pcm_sframes_t ret;
2341         snd_pcm_sframes_t avail;
2342
2343         if (frames == 0)
2344                 return 0;
2345
2346         snd_pcm_stream_lock_irq(substream);
2347         switch (runtime->status->state) {
2348         case SNDRV_PCM_STATE_PREPARED:
2349         case SNDRV_PCM_STATE_PAUSED:
2350                 break;
2351         case SNDRV_PCM_STATE_DRAINING:
2352         case SNDRV_PCM_STATE_RUNNING:
2353                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2354                         break;
2355                 /* Fall through */
2356         case SNDRV_PCM_STATE_XRUN:
2357                 ret = -EPIPE;
2358                 goto __end;
2359         case SNDRV_PCM_STATE_SUSPENDED:
2360                 ret = -ESTRPIPE;
2361                 goto __end;
2362         default:
2363                 ret = -EBADFD;
2364                 goto __end;
2365         }
2366
2367         avail = snd_pcm_playback_avail(runtime);
2368         if (avail <= 0) {
2369                 ret = 0;
2370                 goto __end;
2371         }
2372         if (frames > (snd_pcm_uframes_t)avail)
2373                 frames = avail;
2374         appl_ptr = runtime->control->appl_ptr + frames;
2375         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2376                 appl_ptr -= runtime->boundary;
2377         runtime->control->appl_ptr = appl_ptr;
2378         ret = frames;
2379  __end:
2380         snd_pcm_stream_unlock_irq(substream);
2381         return ret;
2382 }
2383
2384 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2385                                                  snd_pcm_uframes_t frames)
2386 {
2387         struct snd_pcm_runtime *runtime = substream->runtime;
2388         snd_pcm_sframes_t appl_ptr;
2389         snd_pcm_sframes_t ret;
2390         snd_pcm_sframes_t avail;
2391
2392         if (frames == 0)
2393                 return 0;
2394
2395         snd_pcm_stream_lock_irq(substream);
2396         switch (runtime->status->state) {
2397         case SNDRV_PCM_STATE_PREPARED:
2398         case SNDRV_PCM_STATE_DRAINING:
2399         case SNDRV_PCM_STATE_PAUSED:
2400                 break;
2401         case SNDRV_PCM_STATE_RUNNING:
2402                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2403                         break;
2404                 /* Fall through */
2405         case SNDRV_PCM_STATE_XRUN:
2406                 ret = -EPIPE;
2407                 goto __end;
2408         case SNDRV_PCM_STATE_SUSPENDED:
2409                 ret = -ESTRPIPE;
2410                 goto __end;
2411         default:
2412                 ret = -EBADFD;
2413                 goto __end;
2414         }
2415
2416         avail = snd_pcm_capture_avail(runtime);
2417         if (avail <= 0) {
2418                 ret = 0;
2419                 goto __end;
2420         }
2421         if (frames > (snd_pcm_uframes_t)avail)
2422                 frames = avail;
2423         appl_ptr = runtime->control->appl_ptr + frames;
2424         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2425                 appl_ptr -= runtime->boundary;
2426         runtime->control->appl_ptr = appl_ptr;
2427         ret = frames;
2428  __end:
2429         snd_pcm_stream_unlock_irq(substream);
2430         return ret;
2431 }
2432
2433 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2434 {
2435         struct snd_pcm_runtime *runtime = substream->runtime;
2436         int err;
2437
2438         snd_pcm_stream_lock_irq(substream);
2439         switch (runtime->status->state) {
2440         case SNDRV_PCM_STATE_DRAINING:
2441                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2442                         goto __badfd;
2443         case SNDRV_PCM_STATE_RUNNING:
2444                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2445                         break;
2446                 /* Fall through */
2447         case SNDRV_PCM_STATE_PREPARED:
2448         case SNDRV_PCM_STATE_SUSPENDED:
2449                 err = 0;
2450                 break;
2451         case SNDRV_PCM_STATE_XRUN:
2452                 err = -EPIPE;
2453                 break;
2454         default:
2455               __badfd:
2456                 err = -EBADFD;
2457                 break;
2458         }
2459         snd_pcm_stream_unlock_irq(substream);
2460         return err;
2461 }
2462
2463 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2464                          snd_pcm_sframes_t __user *res)
2465 {
2466         struct snd_pcm_runtime *runtime = substream->runtime;
2467         int err;
2468         snd_pcm_sframes_t n = 0;
2469
2470         snd_pcm_stream_lock_irq(substream);
2471         switch (runtime->status->state) {
2472         case SNDRV_PCM_STATE_DRAINING:
2473                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2474                         goto __badfd;
2475         case SNDRV_PCM_STATE_RUNNING:
2476                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2477                         break;
2478                 /* Fall through */
2479         case SNDRV_PCM_STATE_PREPARED:
2480         case SNDRV_PCM_STATE_SUSPENDED:
2481                 err = 0;
2482                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2483                         n = snd_pcm_playback_hw_avail(runtime);
2484                 else
2485                         n = snd_pcm_capture_avail(runtime);
2486                 n += runtime->delay;
2487                 break;
2488         case SNDRV_PCM_STATE_XRUN:
2489                 err = -EPIPE;
2490                 break;
2491         default:
2492               __badfd:
2493                 err = -EBADFD;
2494                 break;
2495         }
2496         snd_pcm_stream_unlock_irq(substream);
2497         if (!err)
2498                 if (put_user(n, res))
2499                         err = -EFAULT;
2500         return err;
2501 }
2502
2503 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2504                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2505 {
2506         struct snd_pcm_runtime *runtime = substream->runtime;
2507         struct snd_pcm_sync_ptr sync_ptr;
2508         volatile struct snd_pcm_mmap_status *status;
2509         volatile struct snd_pcm_mmap_control *control;
2510         int err;
2511
2512         memset(&sync_ptr, 0, sizeof(sync_ptr));
2513         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2514                 return -EFAULT;
2515         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2516                 return -EFAULT;
2517         status = runtime->status;
2518         control = runtime->control;
2519         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2520                 err = snd_pcm_hwsync(substream);
2521                 if (err < 0)
2522                         return err;
2523         }
2524         snd_pcm_stream_lock_irq(substream);
2525         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2526                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2527         else
2528                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2529         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2530                 control->avail_min = sync_ptr.c.control.avail_min;
2531         else
2532                 sync_ptr.c.control.avail_min = control->avail_min;
2533         sync_ptr.s.status.state = status->state;
2534         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2535         sync_ptr.s.status.tstamp = status->tstamp;
2536         sync_ptr.s.status.suspended_state = status->suspended_state;
2537         snd_pcm_stream_unlock_irq(substream);
2538         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2539                 return -EFAULT;
2540         return 0;
2541 }
2542
2543 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2544 {
2545         struct snd_pcm_runtime *runtime = substream->runtime;
2546         int arg;
2547
2548         if (get_user(arg, _arg))
2549                 return -EFAULT;
2550         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2551                 return -EINVAL;
2552         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2553         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2554                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2555         return 0;
2556 }
2557
2558 static int snd_pcm_common_ioctl1(struct file *file,
2559                                  struct snd_pcm_substream *substream,
2560                                  unsigned int cmd, void __user *arg)
2561 {
2562         switch (cmd) {
2563         case SNDRV_PCM_IOCTL_PVERSION:
2564                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2565         case SNDRV_PCM_IOCTL_INFO:
2566                 return snd_pcm_info_user(substream, arg);
2567         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2568                 return 0;
2569         case SNDRV_PCM_IOCTL_TTSTAMP:
2570                 return snd_pcm_tstamp(substream, arg);
2571         case SNDRV_PCM_IOCTL_HW_REFINE:
2572                 return snd_pcm_hw_refine_user(substream, arg);
2573         case SNDRV_PCM_IOCTL_HW_PARAMS:
2574                 return snd_pcm_hw_params_user(substream, arg);
2575         case SNDRV_PCM_IOCTL_HW_FREE:
2576                 return snd_pcm_hw_free(substream);
2577         case SNDRV_PCM_IOCTL_SW_PARAMS:
2578                 return snd_pcm_sw_params_user(substream, arg);
2579         case SNDRV_PCM_IOCTL_STATUS:
2580                 return snd_pcm_status_user(substream, arg);
2581         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2582                 return snd_pcm_channel_info_user(substream, arg);
2583         case SNDRV_PCM_IOCTL_PREPARE:
2584                 return snd_pcm_prepare(substream, file);
2585         case SNDRV_PCM_IOCTL_RESET:
2586                 return snd_pcm_reset(substream);
2587         case SNDRV_PCM_IOCTL_START:
2588                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2589         case SNDRV_PCM_IOCTL_LINK:
2590                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2591         case SNDRV_PCM_IOCTL_UNLINK:
2592                 return snd_pcm_unlink(substream);
2593         case SNDRV_PCM_IOCTL_RESUME:
2594                 return snd_pcm_resume(substream);
2595         case SNDRV_PCM_IOCTL_XRUN:
2596                 return snd_pcm_xrun(substream);
2597         case SNDRV_PCM_IOCTL_HWSYNC:
2598                 return snd_pcm_hwsync(substream);
2599         case SNDRV_PCM_IOCTL_DELAY:
2600                 return snd_pcm_delay(substream, arg);
2601         case SNDRV_PCM_IOCTL_SYNC_PTR:
2602                 return snd_pcm_sync_ptr(substream, arg);
2603 #ifdef CONFIG_SND_SUPPORT_OLD_API
2604         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2605                 return snd_pcm_hw_refine_old_user(substream, arg);
2606         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2607                 return snd_pcm_hw_params_old_user(substream, arg);
2608 #endif
2609         case SNDRV_PCM_IOCTL_DRAIN:
2610                 return snd_pcm_drain(substream, file);
2611         case SNDRV_PCM_IOCTL_DROP:
2612                 return snd_pcm_drop(substream);
2613         case SNDRV_PCM_IOCTL_PAUSE:
2614         {
2615                 int res;
2616                 snd_pcm_stream_lock_irq(substream);
2617                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2618                 snd_pcm_stream_unlock_irq(substream);
2619                 return res;
2620         }
2621         }
2622         snd_printd("unknown ioctl = 0x%x\n", cmd);
2623         return -ENOTTY;
2624 }
2625
2626 static int snd_pcm_playback_ioctl1(struct file *file,
2627                                    struct snd_pcm_substream *substream,
2628                                    unsigned int cmd, void __user *arg)
2629 {
2630         if (snd_BUG_ON(!substream))
2631                 return -ENXIO;
2632         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2633                 return -EINVAL;
2634         switch (cmd) {
2635         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2636         {
2637                 struct snd_xferi xferi;
2638                 struct snd_xferi __user *_xferi = arg;
2639                 struct snd_pcm_runtime *runtime = substream->runtime;
2640                 snd_pcm_sframes_t result;
2641                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2642                         return -EBADFD;
2643                 if (put_user(0, &_xferi->result))
2644                         return -EFAULT;
2645                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2646                         return -EFAULT;
2647                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2648                 __put_user(result, &_xferi->result);
2649                 return result < 0 ? result : 0;
2650         }
2651         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2652         {
2653                 struct snd_xfern xfern;
2654                 struct snd_xfern __user *_xfern = arg;
2655                 struct snd_pcm_runtime *runtime = substream->runtime;
2656                 void __user **bufs;
2657                 snd_pcm_sframes_t result;
2658                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2659                         return -EBADFD;
2660                 if (runtime->channels > 128)
2661                         return -EINVAL;
2662                 if (put_user(0, &_xfern->result))
2663                         return -EFAULT;
2664                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2665                         return -EFAULT;
2666
2667                 bufs = memdup_user(xfern.bufs,
2668                                    sizeof(void *) * runtime->channels);
2669                 if (IS_ERR(bufs))
2670                         return PTR_ERR(bufs);
2671                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2672                 kfree(bufs);
2673                 __put_user(result, &_xfern->result);
2674                 return result < 0 ? result : 0;
2675         }
2676         case SNDRV_PCM_IOCTL_REWIND:
2677         {
2678                 snd_pcm_uframes_t frames;
2679                 snd_pcm_uframes_t __user *_frames = arg;
2680                 snd_pcm_sframes_t result;
2681                 if (get_user(frames, _frames))
2682                         return -EFAULT;
2683                 if (put_user(0, _frames))
2684                         return -EFAULT;
2685                 result = snd_pcm_playback_rewind(substream, frames);
2686                 __put_user(result, _frames);
2687                 return result < 0 ? result : 0;
2688         }
2689         case SNDRV_PCM_IOCTL_FORWARD:
2690         {
2691                 snd_pcm_uframes_t frames;
2692                 snd_pcm_uframes_t __user *_frames = arg;
2693                 snd_pcm_sframes_t result;
2694                 if (get_user(frames, _frames))
2695                         return -EFAULT;
2696                 if (put_user(0, _frames))
2697                         return -EFAULT;
2698                 result = snd_pcm_playback_forward(substream, frames);
2699                 __put_user(result, _frames);
2700                 return result < 0 ? result : 0;
2701         }
2702         }
2703         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2704 }
2705
2706 static int snd_pcm_capture_ioctl1(struct file *file,
2707                                   struct snd_pcm_substream *substream,
2708                                   unsigned int cmd, void __user *arg)
2709 {
2710         if (snd_BUG_ON(!substream))
2711                 return -ENXIO;
2712         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2713                 return -EINVAL;
2714         switch (cmd) {
2715         case SNDRV_PCM_IOCTL_READI_FRAMES:
2716         {
2717                 struct snd_xferi xferi;
2718                 struct snd_xferi __user *_xferi = arg;
2719                 struct snd_pcm_runtime *runtime = substream->runtime;
2720                 snd_pcm_sframes_t result;
2721                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2722                         return -EBADFD;
2723                 if (put_user(0, &_xferi->result))
2724                         return -EFAULT;
2725                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2726                         return -EFAULT;
2727                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2728                 __put_user(result, &_xferi->result);
2729                 return result < 0 ? result : 0;
2730         }
2731         case SNDRV_PCM_IOCTL_READN_FRAMES:
2732         {
2733                 struct snd_xfern xfern;
2734                 struct snd_xfern __user *_xfern = arg;
2735                 struct snd_pcm_runtime *runtime = substream->runtime;
2736                 void *bufs;
2737                 snd_pcm_sframes_t result;
2738                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2739                         return -EBADFD;
2740                 if (runtime->channels > 128)
2741                         return -EINVAL;
2742                 if (put_user(0, &_xfern->result))
2743                         return -EFAULT;
2744                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2745                         return -EFAULT;
2746
2747                 bufs = memdup_user(xfern.bufs,
2748                                    sizeof(void *) * runtime->channels);
2749                 if (IS_ERR(bufs))
2750                         return PTR_ERR(bufs);
2751                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2752                 kfree(bufs);
2753                 __put_user(result, &_xfern->result);
2754                 return result < 0 ? result : 0;
2755         }
2756         case SNDRV_PCM_IOCTL_REWIND:
2757         {
2758                 snd_pcm_uframes_t frames;
2759                 snd_pcm_uframes_t __user *_frames = arg;
2760                 snd_pcm_sframes_t result;
2761                 if (get_user(frames, _frames))
2762                         return -EFAULT;
2763                 if (put_user(0, _frames))
2764                         return -EFAULT;
2765                 result = snd_pcm_capture_rewind(substream, frames);
2766                 __put_user(result, _frames);
2767                 return result < 0 ? result : 0;
2768         }
2769         case SNDRV_PCM_IOCTL_FORWARD:
2770         {
2771                 snd_pcm_uframes_t frames;
2772                 snd_pcm_uframes_t __user *_frames = arg;
2773                 snd_pcm_sframes_t result;
2774                 if (get_user(frames, _frames))
2775                         return -EFAULT;
2776                 if (put_user(0, _frames))
2777                         return -EFAULT;
2778                 result = snd_pcm_capture_forward(substream, frames);
2779                 __put_user(result, _frames);
2780                 return result < 0 ? result : 0;
2781         }
2782         }
2783         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2784 }
2785
2786 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2787                                    unsigned long arg)
2788 {
2789         struct snd_pcm_file *pcm_file;
2790
2791         pcm_file = file->private_data;
2792
2793         if (((cmd >> 8) & 0xff) != 'A')
2794                 return -ENOTTY;
2795
2796         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2797                                        (void __user *)arg);
2798 }
2799
2800 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2801                                   unsigned long arg)
2802 {
2803         struct snd_pcm_file *pcm_file;
2804
2805         pcm_file = file->private_data;
2806
2807         if (((cmd >> 8) & 0xff) != 'A')
2808                 return -ENOTTY;
2809
2810         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2811                                       (void __user *)arg);
2812 }
2813
2814 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2815                          unsigned int cmd, void *arg)
2816 {
2817         mm_segment_t fs;
2818         int result;
2819
2820         fs = snd_enter_user();
2821         switch (substream->stream) {
2822         case SNDRV_PCM_STREAM_PLAYBACK:
2823                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2824                                                  (void __user *)arg);
2825                 break;
2826         case SNDRV_PCM_STREAM_CAPTURE:
2827                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2828                                                 (void __user *)arg);
2829                 break;
2830         default:
2831                 result = -EINVAL;
2832                 break;
2833         }
2834         snd_leave_user(fs);
2835         return result;
2836 }
2837
2838 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2839
2840 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2841                             loff_t * offset)
2842 {
2843         struct snd_pcm_file *pcm_file;
2844         struct snd_pcm_substream *substream;
2845         struct snd_pcm_runtime *runtime;
2846         snd_pcm_sframes_t result;
2847
2848         pcm_file = file->private_data;
2849         substream = pcm_file->substream;
2850         if (PCM_RUNTIME_CHECK(substream))
2851                 return -ENXIO;
2852         runtime = substream->runtime;
2853         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2854                 return -EBADFD;
2855         if (!frame_aligned(runtime, count))
2856                 return -EINVAL;
2857         count = bytes_to_frames(runtime, count);
2858         result = snd_pcm_lib_read(substream, buf, count);
2859         if (result > 0)
2860                 result = frames_to_bytes(runtime, result);
2861         return result;
2862 }
2863
2864 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2865                              size_t count, loff_t * offset)
2866 {
2867         struct snd_pcm_file *pcm_file;
2868         struct snd_pcm_substream *substream;
2869         struct snd_pcm_runtime *runtime;
2870         snd_pcm_sframes_t result;
2871
2872         pcm_file = file->private_data;
2873         substream = pcm_file->substream;
2874         if (PCM_RUNTIME_CHECK(substream))
2875                 return -ENXIO;
2876         runtime = substream->runtime;
2877         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2878                 return -EBADFD;
2879         if (!frame_aligned(runtime, count))
2880                 return -EINVAL;
2881         count = bytes_to_frames(runtime, count);
2882         result = snd_pcm_lib_write(substream, buf, count);
2883         if (result > 0)
2884                 result = frames_to_bytes(runtime, result);
2885         return result;
2886 }
2887
2888 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2889                              unsigned long nr_segs, loff_t pos)
2890
2891 {
2892         struct snd_pcm_file *pcm_file;
2893         struct snd_pcm_substream *substream;
2894         struct snd_pcm_runtime *runtime;
2895         snd_pcm_sframes_t result;
2896         unsigned long i;
2897         void __user **bufs;
2898         snd_pcm_uframes_t frames;
2899
2900         pcm_file = iocb->ki_filp->private_data;
2901         substream = pcm_file->substream;
2902         if (PCM_RUNTIME_CHECK(substream))
2903                 return -ENXIO;
2904         runtime = substream->runtime;
2905         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2906                 return -EBADFD;
2907         if (nr_segs > 1024 || nr_segs != runtime->channels)
2908                 return -EINVAL;
2909         if (!frame_aligned(runtime, iov->iov_len))
2910                 return -EINVAL;
2911         frames = bytes_to_samples(runtime, iov->iov_len);
2912         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2913         if (bufs == NULL)
2914                 return -ENOMEM;
2915         for (i = 0; i < nr_segs; ++i)
2916                 bufs[i] = iov[i].iov_base;
2917         result = snd_pcm_lib_readv(substream, bufs, frames);
2918         if (result > 0)
2919                 result = frames_to_bytes(runtime, result);
2920         kfree(bufs);
2921         return result;
2922 }
2923
2924 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2925                               unsigned long nr_segs, loff_t pos)
2926 {
2927         struct snd_pcm_file *pcm_file;
2928         struct snd_pcm_substream *substream;
2929         struct snd_pcm_runtime *runtime;
2930         snd_pcm_sframes_t result;
2931         unsigned long i;
2932         void __user **bufs;
2933         snd_pcm_uframes_t frames;
2934
2935         pcm_file = iocb->ki_filp->private_data;
2936         substream = pcm_file->substream;
2937         if (PCM_RUNTIME_CHECK(substream))
2938                 return -ENXIO;
2939         runtime = substream->runtime;
2940         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2941                 return -EBADFD;
2942         if (nr_segs > 128 || nr_segs != runtime->channels ||
2943             !frame_aligned(runtime, iov->iov_len))
2944                 return -EINVAL;
2945         frames = bytes_to_samples(runtime, iov->iov_len);
2946         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2947         if (bufs == NULL)
2948                 return -ENOMEM;
2949         for (i = 0; i < nr_segs; ++i)
2950                 bufs[i] = iov[i].iov_base;
2951         result = snd_pcm_lib_writev(substream, bufs, frames);
2952         if (result > 0)
2953                 result = frames_to_bytes(runtime, result);
2954         kfree(bufs);
2955         return result;
2956 }
2957
2958 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2959 {
2960         struct snd_pcm_file *pcm_file;
2961         struct snd_pcm_substream *substream;
2962         struct snd_pcm_runtime *runtime;
2963         unsigned int mask;
2964         snd_pcm_uframes_t avail;
2965
2966         pcm_file = file->private_data;
2967
2968         substream = pcm_file->substream;
2969         if (PCM_RUNTIME_CHECK(substream))
2970                 return -ENXIO;
2971         runtime = substream->runtime;
2972
2973         poll_wait(file, &runtime->sleep, wait);
2974
2975         snd_pcm_stream_lock_irq(substream);
2976         avail = snd_pcm_playback_avail(runtime);
2977         switch (runtime->status->state) {
2978         case SNDRV_PCM_STATE_RUNNING:
2979         case SNDRV_PCM_STATE_PREPARED:
2980         case SNDRV_PCM_STATE_PAUSED:
2981                 if (avail >= runtime->control->avail_min) {
2982                         mask = POLLOUT | POLLWRNORM;
2983                         break;
2984                 }
2985                 /* Fall through */
2986         case SNDRV_PCM_STATE_DRAINING:
2987                 mask = 0;
2988                 break;
2989         default:
2990                 mask = POLLOUT | POLLWRNORM | POLLERR;
2991                 break;
2992         }
2993         snd_pcm_stream_unlock_irq(substream);
2994         return mask;
2995 }
2996
2997 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2998 {
2999         struct snd_pcm_file *pcm_file;
3000         struct snd_pcm_substream *substream;
3001         struct snd_pcm_runtime *runtime;
3002         unsigned int mask;
3003         snd_pcm_uframes_t avail;
3004
3005         pcm_file = file->private_data;
3006
3007         substream = pcm_file->substream;
3008         if (PCM_RUNTIME_CHECK(substream))
3009                 return -ENXIO;
3010         runtime = substream->runtime;
3011
3012         poll_wait(file, &runtime->sleep, wait);
3013
3014         snd_pcm_stream_lock_irq(substream);
3015         avail = snd_pcm_capture_avail(runtime);
3016         switch (runtime->status->state) {
3017         case SNDRV_PCM_STATE_RUNNING:
3018         case SNDRV_PCM_STATE_PREPARED:
3019         case SNDRV_PCM_STATE_PAUSED:
3020                 if (avail >= runtime->control->avail_min) {
3021                         mask = POLLIN | POLLRDNORM;
3022                         break;
3023                 }
3024                 mask = 0;
3025                 break;
3026         case SNDRV_PCM_STATE_DRAINING:
3027                 if (avail > 0) {
3028                         mask = POLLIN | POLLRDNORM;
3029                         break;
3030                 }
3031                 /* Fall through */
3032         default:
3033                 mask = POLLIN | POLLRDNORM | POLLERR;
3034                 break;
3035         }
3036         snd_pcm_stream_unlock_irq(substream);
3037         return mask;
3038 }
3039
3040 /*
3041  * mmap support
3042  */
3043
3044 /*
3045  * Only on coherent architectures, we can mmap the status and the control records
3046  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3047  */
3048 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3049 /*
3050  * mmap status record
3051  */
3052 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3053                                                 struct vm_fault *vmf)
3054 {
3055         struct snd_pcm_substream *substream = area->vm_private_data;
3056         struct snd_pcm_runtime *runtime;
3057
3058         if (substream == NULL)
3059                 return VM_FAULT_SIGBUS;
3060         runtime = substream->runtime;
3061         vmf->page = virt_to_page(runtime->status);
3062         get_page(vmf->page);
3063         return 0;
3064 }
3065
3066 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3067 {
3068         .fault =        snd_pcm_mmap_status_fault,
3069 };
3070
3071 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3072                                struct vm_area_struct *area)
3073 {
3074         long size;
3075         if (!(area->vm_flags & VM_READ))
3076                 return -EINVAL;
3077         size = area->vm_end - area->vm_start;
3078         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3079                 return -EINVAL;
3080         area->vm_ops = &snd_pcm_vm_ops_status;
3081         area->vm_private_data = substream;
3082         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3083         return 0;
3084 }
3085
3086 /*
3087  * mmap control record
3088  */
3089 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3090                                                 struct vm_fault *vmf)
3091 {
3092         struct snd_pcm_substream *substream = area->vm_private_data;
3093         struct snd_pcm_runtime *runtime;
3094
3095         if (substream == NULL)
3096                 return VM_FAULT_SIGBUS;
3097         runtime = substream->runtime;
3098         vmf->page = virt_to_page(runtime->control);
3099         get_page(vmf->page);
3100         return 0;
3101 }
3102
3103 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3104 {
3105         .fault =        snd_pcm_mmap_control_fault,
3106 };
3107
3108 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3109                                 struct vm_area_struct *area)
3110 {
3111         long size;
3112         if (!(area->vm_flags & VM_READ))
3113                 return -EINVAL;
3114         size = area->vm_end - area->vm_start;
3115         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3116                 return -EINVAL;
3117         area->vm_ops = &snd_pcm_vm_ops_control;
3118         area->vm_private_data = substream;
3119         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3120         return 0;
3121 }
3122 #else /* ! coherent mmap */
3123 /*
3124  * don't support mmap for status and control records.
3125  */
3126 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3127                                struct vm_area_struct *area)
3128 {
3129         return -ENXIO;
3130 }
3131 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3132                                 struct vm_area_struct *area)
3133 {
3134         return -ENXIO;
3135 }
3136 #endif /* coherent mmap */
3137
3138 static inline struct page *
3139 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3140 {
3141         void *vaddr = substream->runtime->dma_area + ofs;
3142 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3143         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3144                 return virt_to_page(CAC_ADDR(vaddr));
3145 #endif
3146 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3147         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3148                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3149                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3150                 /* assume dma_handle set via pfn_to_phys() in
3151                  * mm/dma-noncoherent.c
3152                  */
3153                 return pfn_to_page(addr >> PAGE_SHIFT);
3154         }
3155 #endif
3156         return virt_to_page(vaddr);
3157 }
3158
3159 /*
3160  * fault callback for mmapping a RAM page
3161  */
3162 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3163                                                 struct vm_fault *vmf)
3164 {
3165         struct snd_pcm_substream *substream = area->vm_private_data;
3166         struct snd_pcm_runtime *runtime;
3167         unsigned long offset;
3168         struct page * page;
3169         size_t dma_bytes;
3170
3171         if (substream == NULL)
3172                 return VM_FAULT_SIGBUS;
3173         runtime = substream->runtime;
3174         offset = vmf->pgoff << PAGE_SHIFT;
3175         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3176         if (offset > dma_bytes - PAGE_SIZE)
3177                 return VM_FAULT_SIGBUS;
3178         if (substream->ops->page)
3179                 page = substream->ops->page(substream, offset);
3180         else
3181                 page = snd_pcm_default_page_ops(substream, offset);
3182         if (!page)
3183                 return VM_FAULT_SIGBUS;
3184         get_page(page);
3185         vmf->page = page;
3186         return 0;
3187 }
3188
3189 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3190         .open =         snd_pcm_mmap_data_open,
3191         .close =        snd_pcm_mmap_data_close,
3192 };
3193
3194 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3195         .open =         snd_pcm_mmap_data_open,
3196         .close =        snd_pcm_mmap_data_close,
3197         .fault =        snd_pcm_mmap_data_fault,
3198 };
3199
3200 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3201 /* This should be defined / handled globally! */
3202 #if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
3203 #define ARCH_HAS_DMA_MMAP_COHERENT
3204 #endif
3205 #endif
3206
3207 /*
3208  * mmap the DMA buffer on RAM
3209  */
3210 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3211                              struct vm_area_struct *area)
3212 {
3213         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3214 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3215         if (!substream->ops->page &&
3216             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3217                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3218                                          area,
3219                                          substream->runtime->dma_area,
3220                                          substream->runtime->dma_addr,
3221                                          area->vm_end - area->vm_start);
3222 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3223         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3224             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3225                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3226 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3227         /* mmap with fault handler */
3228         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3229         return 0;
3230 }
3231 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3232
3233 /*
3234  * mmap the DMA buffer on I/O memory area
3235  */
3236 #if SNDRV_PCM_INFO_MMAP_IOMEM
3237 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3238                            struct vm_area_struct *area)
3239 {
3240         struct snd_pcm_runtime *runtime = substream->runtime;;
3241
3242         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3243         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3244 }
3245
3246 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3247 #endif /* SNDRV_PCM_INFO_MMAP */
3248
3249 /*
3250  * mmap DMA buffer
3251  */
3252 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3253                       struct vm_area_struct *area)
3254 {
3255         struct snd_pcm_runtime *runtime;
3256         long size;
3257         unsigned long offset;
3258         size_t dma_bytes;
3259         int err;
3260
3261         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3262                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3263                         return -EINVAL;
3264         } else {
3265                 if (!(area->vm_flags & VM_READ))
3266                         return -EINVAL;
3267         }
3268         runtime = substream->runtime;
3269         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3270                 return -EBADFD;
3271         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3272                 return -ENXIO;
3273         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3274             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3275                 return -EINVAL;
3276         size = area->vm_end - area->vm_start;
3277         offset = area->vm_pgoff << PAGE_SHIFT;
3278         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3279         if ((size_t)size > dma_bytes)
3280                 return -EINVAL;
3281         if (offset > dma_bytes - size)
3282                 return -EINVAL;
3283
3284         area->vm_ops = &snd_pcm_vm_ops_data;
3285         area->vm_private_data = substream;
3286         if (substream->ops->mmap)
3287                 err = substream->ops->mmap(substream, area);
3288         else
3289                 err = snd_pcm_lib_default_mmap(substream, area);
3290         if (!err)
3291                 atomic_inc(&substream->mmap_count);
3292         return err;
3293 }
3294
3295 EXPORT_SYMBOL(snd_pcm_mmap_data);
3296
3297 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3298 {
3299         struct snd_pcm_file * pcm_file;
3300         struct snd_pcm_substream *substream;
3301         unsigned long offset;
3302
3303         pcm_file = file->private_data;
3304         substream = pcm_file->substream;
3305         if (PCM_RUNTIME_CHECK(substream))
3306                 return -ENXIO;
3307
3308         offset = area->vm_pgoff << PAGE_SHIFT;
3309         switch (offset) {
3310         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3311                 if (pcm_file->no_compat_mmap)
3312                         return -ENXIO;
3313                 return snd_pcm_mmap_status(substream, file, area);
3314         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3315                 if (pcm_file->no_compat_mmap)
3316                         return -ENXIO;
3317                 return snd_pcm_mmap_control(substream, file, area);
3318         default:
3319                 return snd_pcm_mmap_data(substream, file, area);
3320         }
3321         return 0;
3322 }
3323
3324 static int snd_pcm_fasync(int fd, struct file * file, int on)
3325 {
3326         struct snd_pcm_file * pcm_file;
3327         struct snd_pcm_substream *substream;
3328         struct snd_pcm_runtime *runtime;
3329
3330         pcm_file = file->private_data;
3331         substream = pcm_file->substream;
3332         if (PCM_RUNTIME_CHECK(substream))
3333                 return -ENXIO;
3334         runtime = substream->runtime;
3335         return fasync_helper(fd, file, on, &runtime->fasync);
3336 }
3337
3338 /*
3339  * ioctl32 compat
3340  */
3341 #ifdef CONFIG_COMPAT
3342 #include "pcm_compat.c"
3343 #else
3344 #define snd_pcm_ioctl_compat    NULL
3345 #endif
3346
3347 /*
3348  *  To be removed helpers to keep binary compatibility
3349  */
3350
3351 #ifdef CONFIG_SND_SUPPORT_OLD_API
3352 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3353 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3354
3355 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3356                                                struct snd_pcm_hw_params_old *oparams)
3357 {
3358         unsigned int i;
3359
3360         memset(params, 0, sizeof(*params));
3361         params->flags = oparams->flags;
3362         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3363                 params->masks[i].bits[0] = oparams->masks[i];
3364         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3365         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3366         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3367         params->info = oparams->info;
3368         params->msbits = oparams->msbits;
3369         params->rate_num = oparams->rate_num;
3370         params->rate_den = oparams->rate_den;
3371         params->fifo_size = oparams->fifo_size;
3372 }
3373
3374 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3375                                              struct snd_pcm_hw_params *params)
3376 {
3377         unsigned int i;
3378
3379         memset(oparams, 0, sizeof(*oparams));
3380         oparams->flags = params->flags;
3381         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3382                 oparams->masks[i] = params->masks[i].bits[0];
3383         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3384         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3385         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3386         oparams->info = params->info;
3387         oparams->msbits = params->msbits;
3388         oparams->rate_num = params->rate_num;
3389         oparams->rate_den = params->rate_den;
3390         oparams->fifo_size = params->fifo_size;
3391 }
3392
3393 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3394                                       struct snd_pcm_hw_params_old __user * _oparams)
3395 {
3396         struct snd_pcm_hw_params *params;
3397         struct snd_pcm_hw_params_old *oparams = NULL;
3398         int err;
3399
3400         params = kmalloc(sizeof(*params), GFP_KERNEL);
3401         if (!params)
3402                 return -ENOMEM;
3403
3404         oparams = memdup_user(_oparams, sizeof(*oparams));
3405         if (IS_ERR(oparams)) {
3406                 err = PTR_ERR(oparams);
3407                 goto out;
3408         }
3409         snd_pcm_hw_convert_from_old_params(params, oparams);
3410         err = snd_pcm_hw_refine(substream, params);
3411         snd_pcm_hw_convert_to_old_params(oparams, params);
3412         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3413                 if (!err)
3414                         err = -EFAULT;
3415         }
3416
3417         kfree(oparams);
3418 out:
3419         kfree(params);
3420         return err;
3421 }
3422
3423 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3424                                       struct snd_pcm_hw_params_old __user * _oparams)
3425 {
3426         struct snd_pcm_hw_params *params;
3427         struct snd_pcm_hw_params_old *oparams = NULL;
3428         int err;
3429
3430         params = kmalloc(sizeof(*params), GFP_KERNEL);
3431         if (!params)
3432                 return -ENOMEM;
3433
3434         oparams = memdup_user(_oparams, sizeof(*oparams));
3435         if (IS_ERR(oparams)) {
3436                 err = PTR_ERR(oparams);
3437                 goto out;
3438         }
3439         snd_pcm_hw_convert_from_old_params(params, oparams);
3440         err = snd_pcm_hw_params(substream, params);
3441         snd_pcm_hw_convert_to_old_params(oparams, params);
3442         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3443                 if (!err)
3444                         err = -EFAULT;
3445         }
3446
3447         kfree(oparams);
3448 out:
3449         kfree(params);
3450         return err;
3451 }
3452 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3453
3454 #ifndef CONFIG_MMU
3455 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3456                                                unsigned long addr,
3457                                                unsigned long len,
3458                                                unsigned long pgoff,
3459                                                unsigned long flags)
3460 {
3461         struct snd_pcm_file *pcm_file = file->private_data;
3462         struct snd_pcm_substream *substream = pcm_file->substream;
3463         struct snd_pcm_runtime *runtime = substream->runtime;
3464         unsigned long offset = pgoff << PAGE_SHIFT;
3465
3466         switch (offset) {
3467         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3468                 return (unsigned long)runtime->status;
3469         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3470                 return (unsigned long)runtime->control;
3471         default:
3472                 return (unsigned long)runtime->dma_area + offset;
3473         }
3474 }
3475 #else
3476 # define snd_pcm_get_unmapped_area NULL
3477 #endif
3478
3479 /*
3480  *  Register section
3481  */
3482
3483 const struct file_operations snd_pcm_f_ops[2] = {
3484         {
3485                 .owner =                THIS_MODULE,
3486                 .write =                snd_pcm_write,
3487                 .aio_write =            snd_pcm_aio_write,
3488                 .open =                 snd_pcm_playback_open,
3489                 .release =              snd_pcm_release,
3490                 .llseek =               no_llseek,
3491                 .poll =                 snd_pcm_playback_poll,
3492                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3493                 .compat_ioctl =         snd_pcm_ioctl_compat,
3494                 .mmap =                 snd_pcm_mmap,
3495                 .fasync =               snd_pcm_fasync,
3496                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3497         },
3498         {
3499                 .owner =                THIS_MODULE,
3500                 .read =                 snd_pcm_read,
3501                 .aio_read =             snd_pcm_aio_read,
3502                 .open =                 snd_pcm_capture_open,
3503                 .release =              snd_pcm_release,
3504                 .llseek =               no_llseek,
3505                 .poll =                 snd_pcm_capture_poll,
3506                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3507                 .compat_ioctl =         snd_pcm_ioctl_compat,
3508                 .mmap =                 snd_pcm_mmap,
3509                 .fasync =               snd_pcm_fasync,
3510                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3511         }
3512 };