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                         }
1408                         break;
1409                 case SNDRV_PCM_STATE_RUNNING:
1410                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1411                         break;
1412                 case SNDRV_PCM_STATE_XRUN:
1413                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1414                         break;
1415                 default:
1416                         break;
1417                 }
1418         } else {
1419                 /* stop running stream */
1420                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1421                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1422                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1423                         snd_pcm_do_stop(substream, new_state);
1424                         snd_pcm_post_stop(substream, new_state);
1425                 }
1426         }
1427         return 0;
1428 }
1429
1430 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1431 {
1432 }
1433
1434 static struct action_ops snd_pcm_action_drain_init = {
1435         .pre_action = snd_pcm_pre_drain_init,
1436         .do_action = snd_pcm_do_drain_init,
1437         .post_action = snd_pcm_post_drain_init
1438 };
1439
1440 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1441
1442 /*
1443  * Drain the stream(s).
1444  * When the substream is linked, sync until the draining of all playback streams
1445  * is finished.
1446  * After this call, all streams are supposed to be either SETUP or DRAINING
1447  * (capture only) state.
1448  */
1449 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1450                          struct file *file)
1451 {
1452         struct snd_card *card;
1453         struct snd_pcm_runtime *runtime;
1454         struct snd_pcm_substream *s;
1455         wait_queue_t wait;
1456         int result = 0;
1457         int nonblock = 0;
1458
1459         card = substream->pcm->card;
1460         runtime = substream->runtime;
1461
1462         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1463                 return -EBADFD;
1464
1465         snd_power_lock(card);
1466         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1467                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1468                 if (result < 0) {
1469                         snd_power_unlock(card);
1470                         return result;
1471                 }
1472         }
1473
1474         if (file) {
1475                 if (file->f_flags & O_NONBLOCK)
1476                         nonblock = 1;
1477         } else if (substream->f_flags & O_NONBLOCK)
1478                 nonblock = 1;
1479
1480         down_read(&snd_pcm_link_rwsem);
1481         snd_pcm_stream_lock_irq(substream);
1482         /* resume pause */
1483         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1484                 snd_pcm_pause(substream, 0);
1485
1486         /* pre-start/stop - all running streams are changed to DRAINING state */
1487         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1488         if (result < 0)
1489                 goto unlock;
1490         /* in non-blocking, we don't wait in ioctl but let caller poll */
1491         if (nonblock) {
1492                 result = -EAGAIN;
1493                 goto unlock;
1494         }
1495
1496         for (;;) {
1497                 long tout;
1498                 struct snd_pcm_runtime *to_check;
1499                 if (signal_pending(current)) {
1500                         result = -ERESTARTSYS;
1501                         break;
1502                 }
1503                 /* find a substream to drain */
1504                 to_check = NULL;
1505                 snd_pcm_group_for_each_entry(s, substream) {
1506                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1507                                 continue;
1508                         runtime = s->runtime;
1509                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1510                                 to_check = runtime;
1511                                 break;
1512                         }
1513                 }
1514                 if (!to_check)
1515                         break; /* all drained */
1516                 init_waitqueue_entry(&wait, current);
1517                 add_wait_queue(&to_check->sleep, &wait);
1518                 snd_pcm_stream_unlock_irq(substream);
1519                 up_read(&snd_pcm_link_rwsem);
1520                 snd_power_unlock(card);
1521                 if (runtime->no_period_wakeup)
1522                         tout = MAX_SCHEDULE_TIMEOUT;
1523                 else {
1524                         tout = 10;
1525                         if (runtime->rate) {
1526                                 long t = runtime->period_size * 2 / runtime->rate;
1527                                 tout = max(t, tout);
1528                         }
1529                         tout = msecs_to_jiffies(tout * 1000);
1530                 }
1531                 tout = schedule_timeout_interruptible(tout);
1532                 snd_power_lock(card);
1533                 down_read(&snd_pcm_link_rwsem);
1534                 snd_pcm_stream_lock_irq(substream);
1535                 remove_wait_queue(&to_check->sleep, &wait);
1536                 if (card->shutdown) {
1537                         result = -ENODEV;
1538                         break;
1539                 }
1540                 if (tout == 0) {
1541                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1542                                 result = -ESTRPIPE;
1543                         else {
1544                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1545                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1546                                 result = -EIO;
1547                         }
1548                         break;
1549                 }
1550         }
1551
1552  unlock:
1553         snd_pcm_stream_unlock_irq(substream);
1554         up_read(&snd_pcm_link_rwsem);
1555         snd_power_unlock(card);
1556
1557         return result;
1558 }
1559
1560 /*
1561  * drop ioctl
1562  *
1563  * Immediately put all linked substreams into SETUP state.
1564  */
1565 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1566 {
1567         struct snd_pcm_runtime *runtime;
1568         int result = 0;
1569
1570         if (PCM_RUNTIME_CHECK(substream))
1571                 return -ENXIO;
1572         runtime = substream->runtime;
1573
1574         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1575             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1576             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1577                 return -EBADFD;
1578
1579         snd_pcm_stream_lock_irq(substream);
1580         /* resume pause */
1581         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1582                 snd_pcm_pause(substream, 0);
1583
1584         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1585         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1586         snd_pcm_stream_unlock_irq(substream);
1587
1588         return result;
1589 }
1590
1591
1592 /* WARNING: Don't forget to fput back the file */
1593 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1594 {
1595         struct file *file;
1596         struct inode *inode;
1597         unsigned int minor;
1598
1599         file = fget_light(fd, fput_needed);
1600         if (!file)
1601                 return NULL;
1602         inode = file_inode(file);
1603         if (!S_ISCHR(inode->i_mode) ||
1604             imajor(inode) != snd_major) {
1605                 fput_light(file, *fput_needed);
1606                 return NULL;
1607         }
1608         minor = iminor(inode);
1609         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1610             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1611                 fput_light(file, *fput_needed);
1612                 return NULL;
1613         }
1614         return file;
1615 }
1616
1617 /*
1618  * PCM link handling
1619  */
1620 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1621 {
1622         int res = 0;
1623         struct file *file;
1624         struct snd_pcm_file *pcm_file;
1625         struct snd_pcm_substream *substream1;
1626         struct snd_pcm_group *group;
1627         int fput_needed;
1628
1629         file = snd_pcm_file_fd(fd, &fput_needed);
1630         if (!file)
1631                 return -EBADFD;
1632         pcm_file = file->private_data;
1633         substream1 = pcm_file->substream;
1634         group = kmalloc(sizeof(*group), GFP_KERNEL);
1635         if (!group) {
1636                 res = -ENOMEM;
1637                 goto _nolock;
1638         }
1639         down_write(&snd_pcm_link_rwsem);
1640         write_lock_irq(&snd_pcm_link_rwlock);
1641         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1642             substream->runtime->status->state != substream1->runtime->status->state) {
1643                 res = -EBADFD;
1644                 goto _end;
1645         }
1646         if (snd_pcm_stream_linked(substream1)) {
1647                 res = -EALREADY;
1648                 goto _end;
1649         }
1650         if (!snd_pcm_stream_linked(substream)) {
1651                 substream->group = group;
1652                 group = NULL;
1653                 spin_lock_init(&substream->group->lock);
1654                 INIT_LIST_HEAD(&substream->group->substreams);
1655                 list_add_tail(&substream->link_list, &substream->group->substreams);
1656                 substream->group->count = 1;
1657         }
1658         list_add_tail(&substream1->link_list, &substream->group->substreams);
1659         substream->group->count++;
1660         substream1->group = substream->group;
1661  _end:
1662         write_unlock_irq(&snd_pcm_link_rwlock);
1663         up_write(&snd_pcm_link_rwsem);
1664  _nolock:
1665         snd_card_unref(substream1->pcm->card);
1666         fput_light(file, fput_needed);
1667         kfree(group);
1668         return res;
1669 }
1670
1671 static void relink_to_local(struct snd_pcm_substream *substream)
1672 {
1673         substream->group = &substream->self_group;
1674         INIT_LIST_HEAD(&substream->self_group.substreams);
1675         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1676 }
1677
1678 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1679 {
1680         struct snd_pcm_substream *s;
1681         int res = 0;
1682
1683         down_write(&snd_pcm_link_rwsem);
1684         write_lock_irq(&snd_pcm_link_rwlock);
1685         if (!snd_pcm_stream_linked(substream)) {
1686                 res = -EALREADY;
1687                 goto _end;
1688         }
1689         list_del(&substream->link_list);
1690         substream->group->count--;
1691         if (substream->group->count == 1) {     /* detach the last stream, too */
1692                 snd_pcm_group_for_each_entry(s, substream) {
1693                         relink_to_local(s);
1694                         break;
1695                 }
1696                 kfree(substream->group);
1697         }
1698         relink_to_local(substream);
1699        _end:
1700         write_unlock_irq(&snd_pcm_link_rwlock);
1701         up_write(&snd_pcm_link_rwsem);
1702         return res;
1703 }
1704
1705 /*
1706  * hw configurator
1707  */
1708 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1709                                struct snd_pcm_hw_rule *rule)
1710 {
1711         struct snd_interval t;
1712         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1713                      hw_param_interval_c(params, rule->deps[1]), &t);
1714         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715 }
1716
1717 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1718                                struct snd_pcm_hw_rule *rule)
1719 {
1720         struct snd_interval t;
1721         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1722                      hw_param_interval_c(params, rule->deps[1]), &t);
1723         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1724 }
1725
1726 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1727                                    struct snd_pcm_hw_rule *rule)
1728 {
1729         struct snd_interval t;
1730         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1731                          hw_param_interval_c(params, rule->deps[1]),
1732                          (unsigned long) rule->private, &t);
1733         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1734 }
1735
1736 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1737                                    struct snd_pcm_hw_rule *rule)
1738 {
1739         struct snd_interval t;
1740         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1741                          (unsigned long) rule->private,
1742                          hw_param_interval_c(params, rule->deps[1]), &t);
1743         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1744 }
1745
1746 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1747                                   struct snd_pcm_hw_rule *rule)
1748 {
1749         unsigned int k;
1750         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1751         struct snd_mask m;
1752         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1753         snd_mask_any(&m);
1754         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1755                 int bits;
1756                 if (! snd_mask_test(mask, k))
1757                         continue;
1758                 bits = snd_pcm_format_physical_width(k);
1759                 if (bits <= 0)
1760                         continue; /* ignore invalid formats */
1761                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1762                         snd_mask_reset(&m, k);
1763         }
1764         return snd_mask_refine(mask, &m);
1765 }
1766
1767 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1768                                        struct snd_pcm_hw_rule *rule)
1769 {
1770         struct snd_interval t;
1771         unsigned int k;
1772         t.min = UINT_MAX;
1773         t.max = 0;
1774         t.openmin = 0;
1775         t.openmax = 0;
1776         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1777                 int bits;
1778                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1779                         continue;
1780                 bits = snd_pcm_format_physical_width(k);
1781                 if (bits <= 0)
1782                         continue; /* ignore invalid formats */
1783                 if (t.min > (unsigned)bits)
1784                         t.min = bits;
1785                 if (t.max < (unsigned)bits)
1786                         t.max = bits;
1787         }
1788         t.integer = 1;
1789         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1790 }
1791
1792 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1793 #error "Change this table"
1794 #endif
1795
1796 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1797                                  48000, 64000, 88200, 96000, 176400, 192000 };
1798
1799 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1800         .count = ARRAY_SIZE(rates),
1801         .list = rates,
1802 };
1803
1804 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1805                                 struct snd_pcm_hw_rule *rule)
1806 {
1807         struct snd_pcm_hardware *hw = rule->private;
1808         return snd_interval_list(hw_param_interval(params, rule->var),
1809                                  snd_pcm_known_rates.count,
1810                                  snd_pcm_known_rates.list, hw->rates);
1811 }
1812
1813 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1814                                             struct snd_pcm_hw_rule *rule)
1815 {
1816         struct snd_interval t;
1817         struct snd_pcm_substream *substream = rule->private;
1818         t.min = 0;
1819         t.max = substream->buffer_bytes_max;
1820         t.openmin = 0;
1821         t.openmax = 0;
1822         t.integer = 1;
1823         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1824 }
1825
1826 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1827 {
1828         struct snd_pcm_runtime *runtime = substream->runtime;
1829         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1830         int k, err;
1831
1832         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1833                 snd_mask_any(constrs_mask(constrs, k));
1834         }
1835
1836         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1837                 snd_interval_any(constrs_interval(constrs, k));
1838         }
1839
1840         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1841         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1842         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1843         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1844         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1845
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1847                                    snd_pcm_hw_rule_format, NULL,
1848                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1852                                   snd_pcm_hw_rule_sample_bits, NULL,
1853                                   SNDRV_PCM_HW_PARAM_FORMAT,
1854                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1855         if (err < 0)
1856                 return err;
1857         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1858                                   snd_pcm_hw_rule_div, NULL,
1859                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1860         if (err < 0)
1861                 return err;
1862         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1863                                   snd_pcm_hw_rule_mul, NULL,
1864                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1865         if (err < 0)
1866                 return err;
1867         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1868                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1869                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1870         if (err < 0)
1871                 return err;
1872         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1873                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1874                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1875         if (err < 0)
1876                 return err;
1877         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1878                                   snd_pcm_hw_rule_div, NULL,
1879                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1880         if (err < 0)
1881                 return err;
1882         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1883                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1884                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1885         if (err < 0)
1886                 return err;
1887         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1888                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1889                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1890         if (err < 0)
1891                 return err;
1892         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1893                                   snd_pcm_hw_rule_div, NULL,
1894                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1895         if (err < 0)
1896                 return err;
1897         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1898                                   snd_pcm_hw_rule_div, NULL,
1899                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1900         if (err < 0)
1901                 return err;
1902         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1903                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1904                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1905         if (err < 0)
1906                 return err;
1907         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1908                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1909                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1910         if (err < 0)
1911                 return err;
1912         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1913                                   snd_pcm_hw_rule_mul, NULL,
1914                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1915         if (err < 0)
1916                 return err;
1917         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1918                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1919                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1920         if (err < 0)
1921                 return err;
1922         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1923                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1924                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1925         if (err < 0)
1926                 return err;
1927         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1928                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1929                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1930         if (err < 0)
1931                 return err;
1932         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1933                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1934                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1935         if (err < 0)
1936                 return err;
1937         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1938                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1939                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1940         if (err < 0)
1941                 return err;
1942         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1943                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1944                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1945         if (err < 0)
1946                 return err;
1947         return 0;
1948 }
1949
1950 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1951 {
1952         struct snd_pcm_runtime *runtime = substream->runtime;
1953         struct snd_pcm_hardware *hw = &runtime->hw;
1954         int err;
1955         unsigned int mask = 0;
1956
1957         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1958                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1959         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1960                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1961         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1962                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1963                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1964                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1965                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1966                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1967                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1968         }
1969         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1970         if (err < 0)
1971                 return err;
1972
1973         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1974         if (err < 0)
1975                 return err;
1976
1977         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1978         if (err < 0)
1979                 return err;
1980
1981         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1982                                            hw->channels_min, hw->channels_max);
1983         if (err < 0)
1984                 return err;
1985
1986         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1987                                            hw->rate_min, hw->rate_max);
1988         if (err < 0)
1989                 return err;
1990
1991         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1992                                            hw->period_bytes_min, hw->period_bytes_max);
1993         if (err < 0)
1994                 return err;
1995
1996         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1997                                            hw->periods_min, hw->periods_max);
1998         if (err < 0)
1999                 return err;
2000
2001         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2002                                            hw->period_bytes_min, hw->buffer_bytes_max);
2003         if (err < 0)
2004                 return err;
2005
2006         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
2007                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
2008                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
2009         if (err < 0)
2010                 return err;
2011
2012         /* FIXME: remove */
2013         if (runtime->dma_bytes) {
2014                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
2015                 if (err < 0)
2016                         return err;
2017         }
2018
2019         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
2020                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
2021                                           snd_pcm_hw_rule_rate, hw,
2022                                           SNDRV_PCM_HW_PARAM_RATE, -1);
2023                 if (err < 0)
2024                         return err;
2025         }
2026
2027         /* FIXME: this belong to lowlevel */
2028         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2029
2030         return 0;
2031 }
2032
2033 static void pcm_release_private(struct snd_pcm_substream *substream)
2034 {
2035         snd_pcm_unlink(substream);
2036 }
2037
2038 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2039 {
2040         substream->ref_count--;
2041         if (substream->ref_count > 0)
2042                 return;
2043
2044         snd_pcm_drop(substream);
2045         if (substream->hw_opened) {
2046                 if (substream->ops->hw_free != NULL)
2047                         substream->ops->hw_free(substream);
2048                 substream->ops->close(substream);
2049                 substream->hw_opened = 0;
2050         }
2051         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2052                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2053         if (substream->pcm_release) {
2054                 substream->pcm_release(substream);
2055                 substream->pcm_release = NULL;
2056         }
2057         snd_pcm_detach_substream(substream);
2058 }
2059
2060 EXPORT_SYMBOL(snd_pcm_release_substream);
2061
2062 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2063                            struct file *file,
2064                            struct snd_pcm_substream **rsubstream)
2065 {
2066         struct snd_pcm_substream *substream;
2067         int err;
2068
2069         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2070         if (err < 0)
2071                 return err;
2072         if (substream->ref_count > 1) {
2073                 *rsubstream = substream;
2074                 return 0;
2075         }
2076
2077         err = snd_pcm_hw_constraints_init(substream);
2078         if (err < 0) {
2079                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2080                 goto error;
2081         }
2082
2083         if ((err = substream->ops->open(substream)) < 0)
2084                 goto error;
2085
2086         substream->hw_opened = 1;
2087
2088         err = snd_pcm_hw_constraints_complete(substream);
2089         if (err < 0) {
2090                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2091                 goto error;
2092         }
2093
2094         *rsubstream = substream;
2095         return 0;
2096
2097  error:
2098         snd_pcm_release_substream(substream);
2099         return err;
2100 }
2101
2102 EXPORT_SYMBOL(snd_pcm_open_substream);
2103
2104 static int snd_pcm_open_file(struct file *file,
2105                              struct snd_pcm *pcm,
2106                              int stream)
2107 {
2108         struct snd_pcm_file *pcm_file;
2109         struct snd_pcm_substream *substream;
2110         int err;
2111
2112         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2113         if (err < 0)
2114                 return err;
2115
2116         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2117         if (pcm_file == NULL) {
2118                 snd_pcm_release_substream(substream);
2119                 return -ENOMEM;
2120         }
2121         pcm_file->substream = substream;
2122         if (substream->ref_count == 1) {
2123                 substream->file = pcm_file;
2124                 substream->pcm_release = pcm_release_private;
2125         }
2126         file->private_data = pcm_file;
2127
2128         return 0;
2129 }
2130
2131 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2132 {
2133         struct snd_pcm *pcm;
2134         int err = nonseekable_open(inode, file);
2135         if (err < 0)
2136                 return err;
2137         pcm = snd_lookup_minor_data(iminor(inode),
2138                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2139         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2140         if (pcm)
2141                 snd_card_unref(pcm->card);
2142         return err;
2143 }
2144
2145 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2146 {
2147         struct snd_pcm *pcm;
2148         int err = nonseekable_open(inode, file);
2149         if (err < 0)
2150                 return err;
2151         pcm = snd_lookup_minor_data(iminor(inode),
2152                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2153         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2154         if (pcm)
2155                 snd_card_unref(pcm->card);
2156         return err;
2157 }
2158
2159 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2160 {
2161         int err;
2162         wait_queue_t wait;
2163
2164         if (pcm == NULL) {
2165                 err = -ENODEV;
2166                 goto __error1;
2167         }
2168         err = snd_card_file_add(pcm->card, file);
2169         if (err < 0)
2170                 goto __error1;
2171         if (!try_module_get(pcm->card->module)) {
2172                 err = -EFAULT;
2173                 goto __error2;
2174         }
2175         init_waitqueue_entry(&wait, current);
2176         add_wait_queue(&pcm->open_wait, &wait);
2177         mutex_lock(&pcm->open_mutex);
2178         while (1) {
2179                 err = snd_pcm_open_file(file, pcm, stream);
2180                 if (err >= 0)
2181                         break;
2182                 if (err == -EAGAIN) {
2183                         if (file->f_flags & O_NONBLOCK) {
2184                                 err = -EBUSY;
2185                                 break;
2186                         }
2187                 } else
2188                         break;
2189                 set_current_state(TASK_INTERRUPTIBLE);
2190                 mutex_unlock(&pcm->open_mutex);
2191                 schedule();
2192                 mutex_lock(&pcm->open_mutex);
2193                 if (pcm->card->shutdown) {
2194                         err = -ENODEV;
2195                         break;
2196                 }
2197                 if (signal_pending(current)) {
2198                         err = -ERESTARTSYS;
2199                         break;
2200                 }
2201         }
2202         remove_wait_queue(&pcm->open_wait, &wait);
2203         mutex_unlock(&pcm->open_mutex);
2204         if (err < 0)
2205                 goto __error;
2206         return err;
2207
2208       __error:
2209         module_put(pcm->card->module);
2210       __error2:
2211         snd_card_file_remove(pcm->card, file);
2212       __error1:
2213         return err;
2214 }
2215
2216 static int snd_pcm_release(struct inode *inode, struct file *file)
2217 {
2218         struct snd_pcm *pcm;
2219         struct snd_pcm_substream *substream;
2220         struct snd_pcm_file *pcm_file;
2221
2222         pcm_file = file->private_data;
2223         substream = pcm_file->substream;
2224         if (snd_BUG_ON(!substream))
2225                 return -ENXIO;
2226         pcm = substream->pcm;
2227         mutex_lock(&pcm->open_mutex);
2228         snd_pcm_release_substream(substream);
2229         kfree(pcm_file);
2230         mutex_unlock(&pcm->open_mutex);
2231         wake_up(&pcm->open_wait);
2232         module_put(pcm->card->module);
2233         snd_card_file_remove(pcm->card, file);
2234         return 0;
2235 }
2236
2237 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2238                                                  snd_pcm_uframes_t frames)
2239 {
2240         struct snd_pcm_runtime *runtime = substream->runtime;
2241         snd_pcm_sframes_t appl_ptr;
2242         snd_pcm_sframes_t ret;
2243         snd_pcm_sframes_t hw_avail;
2244
2245         if (frames == 0)
2246                 return 0;
2247
2248         snd_pcm_stream_lock_irq(substream);
2249         switch (runtime->status->state) {
2250         case SNDRV_PCM_STATE_PREPARED:
2251                 break;
2252         case SNDRV_PCM_STATE_DRAINING:
2253         case SNDRV_PCM_STATE_RUNNING:
2254                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2255                         break;
2256                 /* Fall through */
2257         case SNDRV_PCM_STATE_XRUN:
2258                 ret = -EPIPE;
2259                 goto __end;
2260         case SNDRV_PCM_STATE_SUSPENDED:
2261                 ret = -ESTRPIPE;
2262                 goto __end;
2263         default:
2264                 ret = -EBADFD;
2265                 goto __end;
2266         }
2267
2268         hw_avail = snd_pcm_playback_hw_avail(runtime);
2269         if (hw_avail <= 0) {
2270                 ret = 0;
2271                 goto __end;
2272         }
2273         if (frames > (snd_pcm_uframes_t)hw_avail)
2274                 frames = hw_avail;
2275         appl_ptr = runtime->control->appl_ptr - frames;
2276         if (appl_ptr < 0)
2277                 appl_ptr += runtime->boundary;
2278         runtime->control->appl_ptr = appl_ptr;
2279         ret = frames;
2280  __end:
2281         snd_pcm_stream_unlock_irq(substream);
2282         return ret;
2283 }
2284
2285 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2286                                                 snd_pcm_uframes_t frames)
2287 {
2288         struct snd_pcm_runtime *runtime = substream->runtime;
2289         snd_pcm_sframes_t appl_ptr;
2290         snd_pcm_sframes_t ret;
2291         snd_pcm_sframes_t hw_avail;
2292
2293         if (frames == 0)
2294                 return 0;
2295
2296         snd_pcm_stream_lock_irq(substream);
2297         switch (runtime->status->state) {
2298         case SNDRV_PCM_STATE_PREPARED:
2299         case SNDRV_PCM_STATE_DRAINING:
2300                 break;
2301         case SNDRV_PCM_STATE_RUNNING:
2302                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2303                         break;
2304                 /* Fall through */
2305         case SNDRV_PCM_STATE_XRUN:
2306                 ret = -EPIPE;
2307                 goto __end;
2308         case SNDRV_PCM_STATE_SUSPENDED:
2309                 ret = -ESTRPIPE;
2310                 goto __end;
2311         default:
2312                 ret = -EBADFD;
2313                 goto __end;
2314         }
2315
2316         hw_avail = snd_pcm_capture_hw_avail(runtime);
2317         if (hw_avail <= 0) {
2318                 ret = 0;
2319                 goto __end;
2320         }
2321         if (frames > (snd_pcm_uframes_t)hw_avail)
2322                 frames = hw_avail;
2323         appl_ptr = runtime->control->appl_ptr - frames;
2324         if (appl_ptr < 0)
2325                 appl_ptr += runtime->boundary;
2326         runtime->control->appl_ptr = appl_ptr;
2327         ret = frames;
2328  __end:
2329         snd_pcm_stream_unlock_irq(substream);
2330         return ret;
2331 }
2332
2333 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2334                                                   snd_pcm_uframes_t frames)
2335 {
2336         struct snd_pcm_runtime *runtime = substream->runtime;
2337         snd_pcm_sframes_t appl_ptr;
2338         snd_pcm_sframes_t ret;
2339         snd_pcm_sframes_t avail;
2340
2341         if (frames == 0)
2342                 return 0;
2343
2344         snd_pcm_stream_lock_irq(substream);
2345         switch (runtime->status->state) {
2346         case SNDRV_PCM_STATE_PREPARED:
2347         case SNDRV_PCM_STATE_PAUSED:
2348                 break;
2349         case SNDRV_PCM_STATE_DRAINING:
2350         case SNDRV_PCM_STATE_RUNNING:
2351                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2352                         break;
2353                 /* Fall through */
2354         case SNDRV_PCM_STATE_XRUN:
2355                 ret = -EPIPE;
2356                 goto __end;
2357         case SNDRV_PCM_STATE_SUSPENDED:
2358                 ret = -ESTRPIPE;
2359                 goto __end;
2360         default:
2361                 ret = -EBADFD;
2362                 goto __end;
2363         }
2364
2365         avail = snd_pcm_playback_avail(runtime);
2366         if (avail <= 0) {
2367                 ret = 0;
2368                 goto __end;
2369         }
2370         if (frames > (snd_pcm_uframes_t)avail)
2371                 frames = avail;
2372         appl_ptr = runtime->control->appl_ptr + frames;
2373         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2374                 appl_ptr -= runtime->boundary;
2375         runtime->control->appl_ptr = appl_ptr;
2376         ret = frames;
2377  __end:
2378         snd_pcm_stream_unlock_irq(substream);
2379         return ret;
2380 }
2381
2382 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2383                                                  snd_pcm_uframes_t frames)
2384 {
2385         struct snd_pcm_runtime *runtime = substream->runtime;
2386         snd_pcm_sframes_t appl_ptr;
2387         snd_pcm_sframes_t ret;
2388         snd_pcm_sframes_t avail;
2389
2390         if (frames == 0)
2391                 return 0;
2392
2393         snd_pcm_stream_lock_irq(substream);
2394         switch (runtime->status->state) {
2395         case SNDRV_PCM_STATE_PREPARED:
2396         case SNDRV_PCM_STATE_DRAINING:
2397         case SNDRV_PCM_STATE_PAUSED:
2398                 break;
2399         case SNDRV_PCM_STATE_RUNNING:
2400                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2401                         break;
2402                 /* Fall through */
2403         case SNDRV_PCM_STATE_XRUN:
2404                 ret = -EPIPE;
2405                 goto __end;
2406         case SNDRV_PCM_STATE_SUSPENDED:
2407                 ret = -ESTRPIPE;
2408                 goto __end;
2409         default:
2410                 ret = -EBADFD;
2411                 goto __end;
2412         }
2413
2414         avail = snd_pcm_capture_avail(runtime);
2415         if (avail <= 0) {
2416                 ret = 0;
2417                 goto __end;
2418         }
2419         if (frames > (snd_pcm_uframes_t)avail)
2420                 frames = avail;
2421         appl_ptr = runtime->control->appl_ptr + frames;
2422         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2423                 appl_ptr -= runtime->boundary;
2424         runtime->control->appl_ptr = appl_ptr;
2425         ret = frames;
2426  __end:
2427         snd_pcm_stream_unlock_irq(substream);
2428         return ret;
2429 }
2430
2431 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2432 {
2433         struct snd_pcm_runtime *runtime = substream->runtime;
2434         int err;
2435
2436         snd_pcm_stream_lock_irq(substream);
2437         switch (runtime->status->state) {
2438         case SNDRV_PCM_STATE_DRAINING:
2439                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2440                         goto __badfd;
2441         case SNDRV_PCM_STATE_RUNNING:
2442                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2443                         break;
2444                 /* Fall through */
2445         case SNDRV_PCM_STATE_PREPARED:
2446         case SNDRV_PCM_STATE_SUSPENDED:
2447                 err = 0;
2448                 break;
2449         case SNDRV_PCM_STATE_XRUN:
2450                 err = -EPIPE;
2451                 break;
2452         default:
2453               __badfd:
2454                 err = -EBADFD;
2455                 break;
2456         }
2457         snd_pcm_stream_unlock_irq(substream);
2458         return err;
2459 }
2460
2461 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2462                          snd_pcm_sframes_t __user *res)
2463 {
2464         struct snd_pcm_runtime *runtime = substream->runtime;
2465         int err;
2466         snd_pcm_sframes_t n = 0;
2467
2468         snd_pcm_stream_lock_irq(substream);
2469         switch (runtime->status->state) {
2470         case SNDRV_PCM_STATE_DRAINING:
2471                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2472                         goto __badfd;
2473         case SNDRV_PCM_STATE_RUNNING:
2474                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2475                         break;
2476                 /* Fall through */
2477         case SNDRV_PCM_STATE_PREPARED:
2478         case SNDRV_PCM_STATE_SUSPENDED:
2479                 err = 0;
2480                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2481                         n = snd_pcm_playback_hw_avail(runtime);
2482                 else
2483                         n = snd_pcm_capture_avail(runtime);
2484                 n += runtime->delay;
2485                 break;
2486         case SNDRV_PCM_STATE_XRUN:
2487                 err = -EPIPE;
2488                 break;
2489         default:
2490               __badfd:
2491                 err = -EBADFD;
2492                 break;
2493         }
2494         snd_pcm_stream_unlock_irq(substream);
2495         if (!err)
2496                 if (put_user(n, res))
2497                         err = -EFAULT;
2498         return err;
2499 }
2500
2501 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2502                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2503 {
2504         struct snd_pcm_runtime *runtime = substream->runtime;
2505         struct snd_pcm_sync_ptr sync_ptr;
2506         volatile struct snd_pcm_mmap_status *status;
2507         volatile struct snd_pcm_mmap_control *control;
2508         int err;
2509
2510         memset(&sync_ptr, 0, sizeof(sync_ptr));
2511         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2512                 return -EFAULT;
2513         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2514                 return -EFAULT;
2515         status = runtime->status;
2516         control = runtime->control;
2517         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2518                 err = snd_pcm_hwsync(substream);
2519                 if (err < 0)
2520                         return err;
2521         }
2522         snd_pcm_stream_lock_irq(substream);
2523         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2524                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2525         else
2526                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2527         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2528                 control->avail_min = sync_ptr.c.control.avail_min;
2529         else
2530                 sync_ptr.c.control.avail_min = control->avail_min;
2531         sync_ptr.s.status.state = status->state;
2532         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2533         sync_ptr.s.status.tstamp = status->tstamp;
2534         sync_ptr.s.status.suspended_state = status->suspended_state;
2535         snd_pcm_stream_unlock_irq(substream);
2536         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2537                 return -EFAULT;
2538         return 0;
2539 }
2540
2541 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2542 {
2543         struct snd_pcm_runtime *runtime = substream->runtime;
2544         int arg;
2545
2546         if (get_user(arg, _arg))
2547                 return -EFAULT;
2548         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2549                 return -EINVAL;
2550         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2551         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2552                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2553         return 0;
2554 }
2555
2556 static int snd_pcm_common_ioctl1(struct file *file,
2557                                  struct snd_pcm_substream *substream,
2558                                  unsigned int cmd, void __user *arg)
2559 {
2560         switch (cmd) {
2561         case SNDRV_PCM_IOCTL_PVERSION:
2562                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2563         case SNDRV_PCM_IOCTL_INFO:
2564                 return snd_pcm_info_user(substream, arg);
2565         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2566                 return 0;
2567         case SNDRV_PCM_IOCTL_TTSTAMP:
2568                 return snd_pcm_tstamp(substream, arg);
2569         case SNDRV_PCM_IOCTL_HW_REFINE:
2570                 return snd_pcm_hw_refine_user(substream, arg);
2571         case SNDRV_PCM_IOCTL_HW_PARAMS:
2572                 return snd_pcm_hw_params_user(substream, arg);
2573         case SNDRV_PCM_IOCTL_HW_FREE:
2574                 return snd_pcm_hw_free(substream);
2575         case SNDRV_PCM_IOCTL_SW_PARAMS:
2576                 return snd_pcm_sw_params_user(substream, arg);
2577         case SNDRV_PCM_IOCTL_STATUS:
2578                 return snd_pcm_status_user(substream, arg);
2579         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2580                 return snd_pcm_channel_info_user(substream, arg);
2581         case SNDRV_PCM_IOCTL_PREPARE:
2582                 return snd_pcm_prepare(substream, file);
2583         case SNDRV_PCM_IOCTL_RESET:
2584                 return snd_pcm_reset(substream);
2585         case SNDRV_PCM_IOCTL_START:
2586                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2587         case SNDRV_PCM_IOCTL_LINK:
2588                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2589         case SNDRV_PCM_IOCTL_UNLINK:
2590                 return snd_pcm_unlink(substream);
2591         case SNDRV_PCM_IOCTL_RESUME:
2592                 return snd_pcm_resume(substream);
2593         case SNDRV_PCM_IOCTL_XRUN:
2594                 return snd_pcm_xrun(substream);
2595         case SNDRV_PCM_IOCTL_HWSYNC:
2596                 return snd_pcm_hwsync(substream);
2597         case SNDRV_PCM_IOCTL_DELAY:
2598                 return snd_pcm_delay(substream, arg);
2599         case SNDRV_PCM_IOCTL_SYNC_PTR:
2600                 return snd_pcm_sync_ptr(substream, arg);
2601 #ifdef CONFIG_SND_SUPPORT_OLD_API
2602         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2603                 return snd_pcm_hw_refine_old_user(substream, arg);
2604         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2605                 return snd_pcm_hw_params_old_user(substream, arg);
2606 #endif
2607         case SNDRV_PCM_IOCTL_DRAIN:
2608                 return snd_pcm_drain(substream, file);
2609         case SNDRV_PCM_IOCTL_DROP:
2610                 return snd_pcm_drop(substream);
2611         case SNDRV_PCM_IOCTL_PAUSE:
2612         {
2613                 int res;
2614                 snd_pcm_stream_lock_irq(substream);
2615                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2616                 snd_pcm_stream_unlock_irq(substream);
2617                 return res;
2618         }
2619         }
2620         snd_printd("unknown ioctl = 0x%x\n", cmd);
2621         return -ENOTTY;
2622 }
2623
2624 static int snd_pcm_playback_ioctl1(struct file *file,
2625                                    struct snd_pcm_substream *substream,
2626                                    unsigned int cmd, void __user *arg)
2627 {
2628         if (snd_BUG_ON(!substream))
2629                 return -ENXIO;
2630         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2631                 return -EINVAL;
2632         switch (cmd) {
2633         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2634         {
2635                 struct snd_xferi xferi;
2636                 struct snd_xferi __user *_xferi = arg;
2637                 struct snd_pcm_runtime *runtime = substream->runtime;
2638                 snd_pcm_sframes_t result;
2639                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2640                         return -EBADFD;
2641                 if (put_user(0, &_xferi->result))
2642                         return -EFAULT;
2643                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2644                         return -EFAULT;
2645                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2646                 __put_user(result, &_xferi->result);
2647                 return result < 0 ? result : 0;
2648         }
2649         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2650         {
2651                 struct snd_xfern xfern;
2652                 struct snd_xfern __user *_xfern = arg;
2653                 struct snd_pcm_runtime *runtime = substream->runtime;
2654                 void __user **bufs;
2655                 snd_pcm_sframes_t result;
2656                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2657                         return -EBADFD;
2658                 if (runtime->channels > 128)
2659                         return -EINVAL;
2660                 if (put_user(0, &_xfern->result))
2661                         return -EFAULT;
2662                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2663                         return -EFAULT;
2664
2665                 bufs = memdup_user(xfern.bufs,
2666                                    sizeof(void *) * runtime->channels);
2667                 if (IS_ERR(bufs))
2668                         return PTR_ERR(bufs);
2669                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2670                 kfree(bufs);
2671                 __put_user(result, &_xfern->result);
2672                 return result < 0 ? result : 0;
2673         }
2674         case SNDRV_PCM_IOCTL_REWIND:
2675         {
2676                 snd_pcm_uframes_t frames;
2677                 snd_pcm_uframes_t __user *_frames = arg;
2678                 snd_pcm_sframes_t result;
2679                 if (get_user(frames, _frames))
2680                         return -EFAULT;
2681                 if (put_user(0, _frames))
2682                         return -EFAULT;
2683                 result = snd_pcm_playback_rewind(substream, frames);
2684                 __put_user(result, _frames);
2685                 return result < 0 ? result : 0;
2686         }
2687         case SNDRV_PCM_IOCTL_FORWARD:
2688         {
2689                 snd_pcm_uframes_t frames;
2690                 snd_pcm_uframes_t __user *_frames = arg;
2691                 snd_pcm_sframes_t result;
2692                 if (get_user(frames, _frames))
2693                         return -EFAULT;
2694                 if (put_user(0, _frames))
2695                         return -EFAULT;
2696                 result = snd_pcm_playback_forward(substream, frames);
2697                 __put_user(result, _frames);
2698                 return result < 0 ? result : 0;
2699         }
2700         }
2701         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2702 }
2703
2704 static int snd_pcm_capture_ioctl1(struct file *file,
2705                                   struct snd_pcm_substream *substream,
2706                                   unsigned int cmd, void __user *arg)
2707 {
2708         if (snd_BUG_ON(!substream))
2709                 return -ENXIO;
2710         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2711                 return -EINVAL;
2712         switch (cmd) {
2713         case SNDRV_PCM_IOCTL_READI_FRAMES:
2714         {
2715                 struct snd_xferi xferi;
2716                 struct snd_xferi __user *_xferi = arg;
2717                 struct snd_pcm_runtime *runtime = substream->runtime;
2718                 snd_pcm_sframes_t result;
2719                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2720                         return -EBADFD;
2721                 if (put_user(0, &_xferi->result))
2722                         return -EFAULT;
2723                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2724                         return -EFAULT;
2725                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2726                 __put_user(result, &_xferi->result);
2727                 return result < 0 ? result : 0;
2728         }
2729         case SNDRV_PCM_IOCTL_READN_FRAMES:
2730         {
2731                 struct snd_xfern xfern;
2732                 struct snd_xfern __user *_xfern = arg;
2733                 struct snd_pcm_runtime *runtime = substream->runtime;
2734                 void *bufs;
2735                 snd_pcm_sframes_t result;
2736                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2737                         return -EBADFD;
2738                 if (runtime->channels > 128)
2739                         return -EINVAL;
2740                 if (put_user(0, &_xfern->result))
2741                         return -EFAULT;
2742                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2743                         return -EFAULT;
2744
2745                 bufs = memdup_user(xfern.bufs,
2746                                    sizeof(void *) * runtime->channels);
2747                 if (IS_ERR(bufs))
2748                         return PTR_ERR(bufs);
2749                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2750                 kfree(bufs);
2751                 __put_user(result, &_xfern->result);
2752                 return result < 0 ? result : 0;
2753         }
2754         case SNDRV_PCM_IOCTL_REWIND:
2755         {
2756                 snd_pcm_uframes_t frames;
2757                 snd_pcm_uframes_t __user *_frames = arg;
2758                 snd_pcm_sframes_t result;
2759                 if (get_user(frames, _frames))
2760                         return -EFAULT;
2761                 if (put_user(0, _frames))
2762                         return -EFAULT;
2763                 result = snd_pcm_capture_rewind(substream, frames);
2764                 __put_user(result, _frames);
2765                 return result < 0 ? result : 0;
2766         }
2767         case SNDRV_PCM_IOCTL_FORWARD:
2768         {
2769                 snd_pcm_uframes_t frames;
2770                 snd_pcm_uframes_t __user *_frames = arg;
2771                 snd_pcm_sframes_t result;
2772                 if (get_user(frames, _frames))
2773                         return -EFAULT;
2774                 if (put_user(0, _frames))
2775                         return -EFAULT;
2776                 result = snd_pcm_capture_forward(substream, frames);
2777                 __put_user(result, _frames);
2778                 return result < 0 ? result : 0;
2779         }
2780         }
2781         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2782 }
2783
2784 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2785                                    unsigned long arg)
2786 {
2787         struct snd_pcm_file *pcm_file;
2788
2789         pcm_file = file->private_data;
2790
2791         if (((cmd >> 8) & 0xff) != 'A')
2792                 return -ENOTTY;
2793
2794         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2795                                        (void __user *)arg);
2796 }
2797
2798 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2799                                   unsigned long arg)
2800 {
2801         struct snd_pcm_file *pcm_file;
2802
2803         pcm_file = file->private_data;
2804
2805         if (((cmd >> 8) & 0xff) != 'A')
2806                 return -ENOTTY;
2807
2808         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2809                                       (void __user *)arg);
2810 }
2811
2812 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2813                          unsigned int cmd, void *arg)
2814 {
2815         mm_segment_t fs;
2816         int result;
2817
2818         fs = snd_enter_user();
2819         switch (substream->stream) {
2820         case SNDRV_PCM_STREAM_PLAYBACK:
2821                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2822                                                  (void __user *)arg);
2823                 break;
2824         case SNDRV_PCM_STREAM_CAPTURE:
2825                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2826                                                 (void __user *)arg);
2827                 break;
2828         default:
2829                 result = -EINVAL;
2830                 break;
2831         }
2832         snd_leave_user(fs);
2833         return result;
2834 }
2835
2836 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2837
2838 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2839                             loff_t * offset)
2840 {
2841         struct snd_pcm_file *pcm_file;
2842         struct snd_pcm_substream *substream;
2843         struct snd_pcm_runtime *runtime;
2844         snd_pcm_sframes_t result;
2845
2846         pcm_file = file->private_data;
2847         substream = pcm_file->substream;
2848         if (PCM_RUNTIME_CHECK(substream))
2849                 return -ENXIO;
2850         runtime = substream->runtime;
2851         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2852                 return -EBADFD;
2853         if (!frame_aligned(runtime, count))
2854                 return -EINVAL;
2855         count = bytes_to_frames(runtime, count);
2856         result = snd_pcm_lib_read(substream, buf, count);
2857         if (result > 0)
2858                 result = frames_to_bytes(runtime, result);
2859         return result;
2860 }
2861
2862 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2863                              size_t count, loff_t * offset)
2864 {
2865         struct snd_pcm_file *pcm_file;
2866         struct snd_pcm_substream *substream;
2867         struct snd_pcm_runtime *runtime;
2868         snd_pcm_sframes_t result;
2869
2870         pcm_file = file->private_data;
2871         substream = pcm_file->substream;
2872         if (PCM_RUNTIME_CHECK(substream))
2873                 return -ENXIO;
2874         runtime = substream->runtime;
2875         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2876                 return -EBADFD;
2877         if (!frame_aligned(runtime, count))
2878                 return -EINVAL;
2879         count = bytes_to_frames(runtime, count);
2880         result = snd_pcm_lib_write(substream, buf, count);
2881         if (result > 0)
2882                 result = frames_to_bytes(runtime, result);
2883         return result;
2884 }
2885
2886 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2887                              unsigned long nr_segs, loff_t pos)
2888
2889 {
2890         struct snd_pcm_file *pcm_file;
2891         struct snd_pcm_substream *substream;
2892         struct snd_pcm_runtime *runtime;
2893         snd_pcm_sframes_t result;
2894         unsigned long i;
2895         void __user **bufs;
2896         snd_pcm_uframes_t frames;
2897
2898         pcm_file = iocb->ki_filp->private_data;
2899         substream = pcm_file->substream;
2900         if (PCM_RUNTIME_CHECK(substream))
2901                 return -ENXIO;
2902         runtime = substream->runtime;
2903         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2904                 return -EBADFD;
2905         if (nr_segs > 1024 || nr_segs != runtime->channels)
2906                 return -EINVAL;
2907         if (!frame_aligned(runtime, iov->iov_len))
2908                 return -EINVAL;
2909         frames = bytes_to_samples(runtime, iov->iov_len);
2910         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2911         if (bufs == NULL)
2912                 return -ENOMEM;
2913         for (i = 0; i < nr_segs; ++i)
2914                 bufs[i] = iov[i].iov_base;
2915         result = snd_pcm_lib_readv(substream, bufs, frames);
2916         if (result > 0)
2917                 result = frames_to_bytes(runtime, result);
2918         kfree(bufs);
2919         return result;
2920 }
2921
2922 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2923                               unsigned long nr_segs, loff_t pos)
2924 {
2925         struct snd_pcm_file *pcm_file;
2926         struct snd_pcm_substream *substream;
2927         struct snd_pcm_runtime *runtime;
2928         snd_pcm_sframes_t result;
2929         unsigned long i;
2930         void __user **bufs;
2931         snd_pcm_uframes_t frames;
2932
2933         pcm_file = iocb->ki_filp->private_data;
2934         substream = pcm_file->substream;
2935         if (PCM_RUNTIME_CHECK(substream))
2936                 return -ENXIO;
2937         runtime = substream->runtime;
2938         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2939                 return -EBADFD;
2940         if (nr_segs > 128 || nr_segs != runtime->channels ||
2941             !frame_aligned(runtime, iov->iov_len))
2942                 return -EINVAL;
2943         frames = bytes_to_samples(runtime, iov->iov_len);
2944         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2945         if (bufs == NULL)
2946                 return -ENOMEM;
2947         for (i = 0; i < nr_segs; ++i)
2948                 bufs[i] = iov[i].iov_base;
2949         result = snd_pcm_lib_writev(substream, bufs, frames);
2950         if (result > 0)
2951                 result = frames_to_bytes(runtime, result);
2952         kfree(bufs);
2953         return result;
2954 }
2955
2956 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2957 {
2958         struct snd_pcm_file *pcm_file;
2959         struct snd_pcm_substream *substream;
2960         struct snd_pcm_runtime *runtime;
2961         unsigned int mask;
2962         snd_pcm_uframes_t avail;
2963
2964         pcm_file = file->private_data;
2965
2966         substream = pcm_file->substream;
2967         if (PCM_RUNTIME_CHECK(substream))
2968                 return -ENXIO;
2969         runtime = substream->runtime;
2970
2971         poll_wait(file, &runtime->sleep, wait);
2972
2973         snd_pcm_stream_lock_irq(substream);
2974         avail = snd_pcm_playback_avail(runtime);
2975         switch (runtime->status->state) {
2976         case SNDRV_PCM_STATE_RUNNING:
2977         case SNDRV_PCM_STATE_PREPARED:
2978         case SNDRV_PCM_STATE_PAUSED:
2979                 if (avail >= runtime->control->avail_min) {
2980                         mask = POLLOUT | POLLWRNORM;
2981                         break;
2982                 }
2983                 /* Fall through */
2984         case SNDRV_PCM_STATE_DRAINING:
2985                 mask = 0;
2986                 break;
2987         default:
2988                 mask = POLLOUT | POLLWRNORM | POLLERR;
2989                 break;
2990         }
2991         snd_pcm_stream_unlock_irq(substream);
2992         return mask;
2993 }
2994
2995 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2996 {
2997         struct snd_pcm_file *pcm_file;
2998         struct snd_pcm_substream *substream;
2999         struct snd_pcm_runtime *runtime;
3000         unsigned int mask;
3001         snd_pcm_uframes_t avail;
3002
3003         pcm_file = file->private_data;
3004
3005         substream = pcm_file->substream;
3006         if (PCM_RUNTIME_CHECK(substream))
3007                 return -ENXIO;
3008         runtime = substream->runtime;
3009
3010         poll_wait(file, &runtime->sleep, wait);
3011
3012         snd_pcm_stream_lock_irq(substream);
3013         avail = snd_pcm_capture_avail(runtime);
3014         switch (runtime->status->state) {
3015         case SNDRV_PCM_STATE_RUNNING:
3016         case SNDRV_PCM_STATE_PREPARED:
3017         case SNDRV_PCM_STATE_PAUSED:
3018                 if (avail >= runtime->control->avail_min) {
3019                         mask = POLLIN | POLLRDNORM;
3020                         break;
3021                 }
3022                 mask = 0;
3023                 break;
3024         case SNDRV_PCM_STATE_DRAINING:
3025                 if (avail > 0) {
3026                         mask = POLLIN | POLLRDNORM;
3027                         break;
3028                 }
3029                 /* Fall through */
3030         default:
3031                 mask = POLLIN | POLLRDNORM | POLLERR;
3032                 break;
3033         }
3034         snd_pcm_stream_unlock_irq(substream);
3035         return mask;
3036 }
3037
3038 /*
3039  * mmap support
3040  */
3041
3042 /*
3043  * Only on coherent architectures, we can mmap the status and the control records
3044  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3045  */
3046 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3047 /*
3048  * mmap status record
3049  */
3050 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3051                                                 struct vm_fault *vmf)
3052 {
3053         struct snd_pcm_substream *substream = area->vm_private_data;
3054         struct snd_pcm_runtime *runtime;
3055
3056         if (substream == NULL)
3057                 return VM_FAULT_SIGBUS;
3058         runtime = substream->runtime;
3059         vmf->page = virt_to_page(runtime->status);
3060         get_page(vmf->page);
3061         return 0;
3062 }
3063
3064 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3065 {
3066         .fault =        snd_pcm_mmap_status_fault,
3067 };
3068
3069 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3070                                struct vm_area_struct *area)
3071 {
3072         long size;
3073         if (!(area->vm_flags & VM_READ))
3074                 return -EINVAL;
3075         size = area->vm_end - area->vm_start;
3076         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3077                 return -EINVAL;
3078         area->vm_ops = &snd_pcm_vm_ops_status;
3079         area->vm_private_data = substream;
3080         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3081         return 0;
3082 }
3083
3084 /*
3085  * mmap control record
3086  */
3087 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3088                                                 struct vm_fault *vmf)
3089 {
3090         struct snd_pcm_substream *substream = area->vm_private_data;
3091         struct snd_pcm_runtime *runtime;
3092
3093         if (substream == NULL)
3094                 return VM_FAULT_SIGBUS;
3095         runtime = substream->runtime;
3096         vmf->page = virt_to_page(runtime->control);
3097         get_page(vmf->page);
3098         return 0;
3099 }
3100
3101 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3102 {
3103         .fault =        snd_pcm_mmap_control_fault,
3104 };
3105
3106 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3107                                 struct vm_area_struct *area)
3108 {
3109         long size;
3110         if (!(area->vm_flags & VM_READ))
3111                 return -EINVAL;
3112         size = area->vm_end - area->vm_start;
3113         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3114                 return -EINVAL;
3115         area->vm_ops = &snd_pcm_vm_ops_control;
3116         area->vm_private_data = substream;
3117         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3118         return 0;
3119 }
3120 #else /* ! coherent mmap */
3121 /*
3122  * don't support mmap for status and control records.
3123  */
3124 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3125                                struct vm_area_struct *area)
3126 {
3127         return -ENXIO;
3128 }
3129 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3130                                 struct vm_area_struct *area)
3131 {
3132         return -ENXIO;
3133 }
3134 #endif /* coherent mmap */
3135
3136 static inline struct page *
3137 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3138 {
3139         void *vaddr = substream->runtime->dma_area + ofs;
3140 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3141         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3142                 return virt_to_page(CAC_ADDR(vaddr));
3143 #endif
3144 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3145         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3146                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3147                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3148                 /* assume dma_handle set via pfn_to_phys() in
3149                  * mm/dma-noncoherent.c
3150                  */
3151                 return pfn_to_page(addr >> PAGE_SHIFT);
3152         }
3153 #endif
3154         return virt_to_page(vaddr);
3155 }
3156
3157 /*
3158  * fault callback for mmapping a RAM page
3159  */
3160 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3161                                                 struct vm_fault *vmf)
3162 {
3163         struct snd_pcm_substream *substream = area->vm_private_data;
3164         struct snd_pcm_runtime *runtime;
3165         unsigned long offset;
3166         struct page * page;
3167         size_t dma_bytes;
3168
3169         if (substream == NULL)
3170                 return VM_FAULT_SIGBUS;
3171         runtime = substream->runtime;
3172         offset = vmf->pgoff << PAGE_SHIFT;
3173         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3174         if (offset > dma_bytes - PAGE_SIZE)
3175                 return VM_FAULT_SIGBUS;
3176         if (substream->ops->page)
3177                 page = substream->ops->page(substream, offset);
3178         else
3179                 page = snd_pcm_default_page_ops(substream, offset);
3180         if (!page)
3181                 return VM_FAULT_SIGBUS;
3182         get_page(page);
3183         vmf->page = page;
3184         return 0;
3185 }
3186
3187 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3188         .open =         snd_pcm_mmap_data_open,
3189         .close =        snd_pcm_mmap_data_close,
3190 };
3191
3192 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3193         .open =         snd_pcm_mmap_data_open,
3194         .close =        snd_pcm_mmap_data_close,
3195         .fault =        snd_pcm_mmap_data_fault,
3196 };
3197
3198 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3199 /* This should be defined / handled globally! */
3200 #ifdef CONFIG_ARM
3201 #define ARCH_HAS_DMA_MMAP_COHERENT
3202 #endif
3203 #endif
3204
3205 /*
3206  * mmap the DMA buffer on RAM
3207  */
3208 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3209                              struct vm_area_struct *area)
3210 {
3211         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
3212 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3213         if (!substream->ops->page &&
3214             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3215                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3216                                          area,
3217                                          substream->runtime->dma_area,
3218                                          substream->runtime->dma_addr,
3219                                          area->vm_end - area->vm_start);
3220 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3221         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3222             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3223                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3224 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3225         /* mmap with fault handler */
3226         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3227         return 0;
3228 }
3229 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3230
3231 /*
3232  * mmap the DMA buffer on I/O memory area
3233  */
3234 #if SNDRV_PCM_INFO_MMAP_IOMEM
3235 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3236                            struct vm_area_struct *area)
3237 {
3238         struct snd_pcm_runtime *runtime = substream->runtime;;
3239
3240         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3241         return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes);
3242 }
3243
3244 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3245 #endif /* SNDRV_PCM_INFO_MMAP */
3246
3247 /*
3248  * mmap DMA buffer
3249  */
3250 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3251                       struct vm_area_struct *area)
3252 {
3253         struct snd_pcm_runtime *runtime;
3254         long size;
3255         unsigned long offset;
3256         size_t dma_bytes;
3257         int err;
3258
3259         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3260                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3261                         return -EINVAL;
3262         } else {
3263                 if (!(area->vm_flags & VM_READ))
3264                         return -EINVAL;
3265         }
3266         runtime = substream->runtime;
3267         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3268                 return -EBADFD;
3269         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3270                 return -ENXIO;
3271         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3272             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3273                 return -EINVAL;
3274         size = area->vm_end - area->vm_start;
3275         offset = area->vm_pgoff << PAGE_SHIFT;
3276         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3277         if ((size_t)size > dma_bytes)
3278                 return -EINVAL;
3279         if (offset > dma_bytes - size)
3280                 return -EINVAL;
3281
3282         area->vm_ops = &snd_pcm_vm_ops_data;
3283         area->vm_private_data = substream;
3284         if (substream->ops->mmap)
3285                 err = substream->ops->mmap(substream, area);
3286         else
3287                 err = snd_pcm_lib_default_mmap(substream, area);
3288         if (!err)
3289                 atomic_inc(&substream->mmap_count);
3290         return err;
3291 }
3292
3293 EXPORT_SYMBOL(snd_pcm_mmap_data);
3294
3295 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3296 {
3297         struct snd_pcm_file * pcm_file;
3298         struct snd_pcm_substream *substream;
3299         unsigned long offset;
3300
3301         pcm_file = file->private_data;
3302         substream = pcm_file->substream;
3303         if (PCM_RUNTIME_CHECK(substream))
3304                 return -ENXIO;
3305
3306         offset = area->vm_pgoff << PAGE_SHIFT;
3307         switch (offset) {
3308         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3309                 if (pcm_file->no_compat_mmap)
3310                         return -ENXIO;
3311                 return snd_pcm_mmap_status(substream, file, area);
3312         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3313                 if (pcm_file->no_compat_mmap)
3314                         return -ENXIO;
3315                 return snd_pcm_mmap_control(substream, file, area);
3316         default:
3317                 return snd_pcm_mmap_data(substream, file, area);
3318         }
3319         return 0;
3320 }
3321
3322 static int snd_pcm_fasync(int fd, struct file * file, int on)
3323 {
3324         struct snd_pcm_file * pcm_file;
3325         struct snd_pcm_substream *substream;
3326         struct snd_pcm_runtime *runtime;
3327
3328         pcm_file = file->private_data;
3329         substream = pcm_file->substream;
3330         if (PCM_RUNTIME_CHECK(substream))
3331                 return -ENXIO;
3332         runtime = substream->runtime;
3333         return fasync_helper(fd, file, on, &runtime->fasync);
3334 }
3335
3336 /*
3337  * ioctl32 compat
3338  */
3339 #ifdef CONFIG_COMPAT
3340 #include "pcm_compat.c"
3341 #else
3342 #define snd_pcm_ioctl_compat    NULL
3343 #endif
3344
3345 /*
3346  *  To be removed helpers to keep binary compatibility
3347  */
3348
3349 #ifdef CONFIG_SND_SUPPORT_OLD_API
3350 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3351 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3352
3353 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3354                                                struct snd_pcm_hw_params_old *oparams)
3355 {
3356         unsigned int i;
3357
3358         memset(params, 0, sizeof(*params));
3359         params->flags = oparams->flags;
3360         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3361                 params->masks[i].bits[0] = oparams->masks[i];
3362         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3363         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3364         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3365         params->info = oparams->info;
3366         params->msbits = oparams->msbits;
3367         params->rate_num = oparams->rate_num;
3368         params->rate_den = oparams->rate_den;
3369         params->fifo_size = oparams->fifo_size;
3370 }
3371
3372 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3373                                              struct snd_pcm_hw_params *params)
3374 {
3375         unsigned int i;
3376
3377         memset(oparams, 0, sizeof(*oparams));
3378         oparams->flags = params->flags;
3379         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3380                 oparams->masks[i] = params->masks[i].bits[0];
3381         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3382         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3383         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3384         oparams->info = params->info;
3385         oparams->msbits = params->msbits;
3386         oparams->rate_num = params->rate_num;
3387         oparams->rate_den = params->rate_den;
3388         oparams->fifo_size = params->fifo_size;
3389 }
3390
3391 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3392                                       struct snd_pcm_hw_params_old __user * _oparams)
3393 {
3394         struct snd_pcm_hw_params *params;
3395         struct snd_pcm_hw_params_old *oparams = NULL;
3396         int err;
3397
3398         params = kmalloc(sizeof(*params), GFP_KERNEL);
3399         if (!params)
3400                 return -ENOMEM;
3401
3402         oparams = memdup_user(_oparams, sizeof(*oparams));
3403         if (IS_ERR(oparams)) {
3404                 err = PTR_ERR(oparams);
3405                 goto out;
3406         }
3407         snd_pcm_hw_convert_from_old_params(params, oparams);
3408         err = snd_pcm_hw_refine(substream, params);
3409         snd_pcm_hw_convert_to_old_params(oparams, params);
3410         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3411                 if (!err)
3412                         err = -EFAULT;
3413         }
3414
3415         kfree(oparams);
3416 out:
3417         kfree(params);
3418         return err;
3419 }
3420
3421 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3422                                       struct snd_pcm_hw_params_old __user * _oparams)
3423 {
3424         struct snd_pcm_hw_params *params;
3425         struct snd_pcm_hw_params_old *oparams = NULL;
3426         int err;
3427
3428         params = kmalloc(sizeof(*params), GFP_KERNEL);
3429         if (!params)
3430                 return -ENOMEM;
3431
3432         oparams = memdup_user(_oparams, sizeof(*oparams));
3433         if (IS_ERR(oparams)) {
3434                 err = PTR_ERR(oparams);
3435                 goto out;
3436         }
3437         snd_pcm_hw_convert_from_old_params(params, oparams);
3438         err = snd_pcm_hw_params(substream, params);
3439         snd_pcm_hw_convert_to_old_params(oparams, params);
3440         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3441                 if (!err)
3442                         err = -EFAULT;
3443         }
3444
3445         kfree(oparams);
3446 out:
3447         kfree(params);
3448         return err;
3449 }
3450 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3451
3452 #ifndef CONFIG_MMU
3453 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3454                                                unsigned long addr,
3455                                                unsigned long len,
3456                                                unsigned long pgoff,
3457                                                unsigned long flags)
3458 {
3459         struct snd_pcm_file *pcm_file = file->private_data;
3460         struct snd_pcm_substream *substream = pcm_file->substream;
3461         struct snd_pcm_runtime *runtime = substream->runtime;
3462         unsigned long offset = pgoff << PAGE_SHIFT;
3463
3464         switch (offset) {
3465         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3466                 return (unsigned long)runtime->status;
3467         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3468                 return (unsigned long)runtime->control;
3469         default:
3470                 return (unsigned long)runtime->dma_area + offset;
3471         }
3472 }
3473 #else
3474 # define snd_pcm_get_unmapped_area NULL
3475 #endif
3476
3477 /*
3478  *  Register section
3479  */
3480
3481 const struct file_operations snd_pcm_f_ops[2] = {
3482         {
3483                 .owner =                THIS_MODULE,
3484                 .write =                snd_pcm_write,
3485                 .aio_write =            snd_pcm_aio_write,
3486                 .open =                 snd_pcm_playback_open,
3487                 .release =              snd_pcm_release,
3488                 .llseek =               no_llseek,
3489                 .poll =                 snd_pcm_playback_poll,
3490                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3491                 .compat_ioctl =         snd_pcm_ioctl_compat,
3492                 .mmap =                 snd_pcm_mmap,
3493                 .fasync =               snd_pcm_fasync,
3494                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3495         },
3496         {
3497                 .owner =                THIS_MODULE,
3498                 .read =                 snd_pcm_read,
3499                 .aio_read =             snd_pcm_aio_read,
3500                 .open =                 snd_pcm_capture_open,
3501                 .release =              snd_pcm_release,
3502                 .llseek =               no_llseek,
3503                 .poll =                 snd_pcm_capture_poll,
3504                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3505                 .compat_ioctl =         snd_pcm_ioctl_compat,
3506                 .mmap =                 snd_pcm_mmap,
3507                 .fasync =               snd_pcm_fasync,
3508                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3509         }
3510 };