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/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/pm_qos_params.h>
  27 #include <linux/uio.h>
  28 #include <linux/dma-mapping.h>
  29 #include <sound/core.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/timer.h>
  35 #include <sound/minors.h>
  36 #include <asm/io.h>
  37 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  38 #include <dma-coherence.h>
  39 #endif
  40
  41 /*
  42  *  Compatibility
  43  */
  44
  45 struct snd_pcm_hw_params_old {
  46         unsigned int flags;
  47         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  48                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  49         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  50                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  51         unsigned int rmask;
  52         unsigned int cmask;
  53         unsigned int info;
  54         unsigned int msbits;
  55         unsigned int rate_num;
  56         unsigned int rate_den;
  57         snd_pcm_uframes_t fifo_size;
  58         unsigned char reserved[64];
  59 };
  60
  61 #ifdef CONFIG_SND_SUPPORT_OLD_API
  62 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  63 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  64
  65 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  66                                       struct snd_pcm_hw_params_old __user * _oparams);
  67 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  68                                       struct snd_pcm_hw_params_old __user * _oparams);
  69 #endif
  70 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  71
  72 /*
  73  *
  74  */
  75
  76 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  77 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  78
  79 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  80
  81 static inline mm_segment_t snd_enter_user(void)
  82 {
  83         mm_segment_t fs = get_fs();
  84         set_fs(get_ds());
  85         return fs;
  86 }
  87
  88 static inline void snd_leave_user(mm_segment_t fs)
  89 {
  90         set_fs(fs);
  91 }
  92
  93
  94
  95 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  96 {
  97         struct snd_pcm_runtime *runtime;
  98         struct snd_pcm *pcm = substream->pcm;
  99         struct snd_pcm_str *pstr = substream->pstr;
 100
 101         memset(info, 0, sizeof(*info));
 102         info->card = pcm->card->number;
 103         info->device = pcm->device;
 104         info->stream = substream->stream;
 105         info->subdevice = substream->number;
 106         strlcpy(info->id, pcm->id, sizeof(info->id));
 107         strlcpy(info->name, pcm->name, sizeof(info->name));
 108         info->dev_class = pcm->dev_class;
 109         info->dev_subclass = pcm->dev_subclass;
 110         info->subdevices_count = pstr->substream_count;
 111         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 112         strlcpy(info->subname, substream->name, sizeof(info->subname));
 113         runtime = substream->runtime;
 114         /* AB: FIXME!!! This is definitely nonsense */
 115         if (runtime) {
 116                 info->sync = runtime->sync;
 117                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 118         }
 119         return 0;
 120 }
 121
 122 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 123                       struct snd_pcm_info __user * _info)
 124 {
 125         struct snd_pcm_info *info;
 126         int err;
 127
 128         info = kmalloc(sizeof(*info), GFP_KERNEL);
 129         if (! info)
 130                 return -ENOMEM;
 131         err = snd_pcm_info(substream, info);
 132         if (err >= 0) {
 133                 if (copy_to_user(_info, info, sizeof(*info)))
 134                         err = -EFAULT;
 135         }
 136         kfree(info);
 137         return err;
 138 }
 139
 140 #undef RULES_DEBUG
 141
 142 #ifdef RULES_DEBUG
 143 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 144 static const char * const snd_pcm_hw_param_names[] = {
 145         HW_PARAM(ACCESS),
 146         HW_PARAM(FORMAT),
 147         HW_PARAM(SUBFORMAT),
 148         HW_PARAM(SAMPLE_BITS),
 149         HW_PARAM(FRAME_BITS),
 150         HW_PARAM(CHANNELS),
 151         HW_PARAM(RATE),
 152         HW_PARAM(PERIOD_TIME),
 153         HW_PARAM(PERIOD_SIZE),
 154         HW_PARAM(PERIOD_BYTES),
 155         HW_PARAM(PERIODS),
 156         HW_PARAM(BUFFER_TIME),
 157         HW_PARAM(BUFFER_SIZE),
 158         HW_PARAM(BUFFER_BYTES),
 159         HW_PARAM(TICK_TIME),
 160 };
 161 #endif
 162
 163 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 164                       struct snd_pcm_hw_params *params)
 165 {
 166         unsigned int k;
 167         struct snd_pcm_hardware *hw;
 168         struct snd_interval *i = NULL;
 169         struct snd_mask *m = NULL;
 170         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 171         unsigned int rstamps[constrs->rules_num];
 172         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 173         unsigned int stamp = 2;
 174         int changed, again;
 175
 176         params->info = 0;
 177         params->fifo_size = 0;
 178         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 179                 params->msbits = 0;
 180         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 181                 params->rate_num = 0;
 182                 params->rate_den = 0;
 183         }
 184
 185         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 186                 m = hw_param_mask(params, k);
 187                 if (snd_mask_empty(m))
 188                         return -EINVAL;
 189                 if (!(params->rmask & (1 << k)))
 190                         continue;
 191 #ifdef RULES_DEBUG
 192                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 193                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 194 #endif
 195                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 196 #ifdef RULES_DEBUG
 197                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 198 #endif
 199                 if (changed)
 200                         params->cmask |= 1 << k;
 201                 if (changed < 0)
 202                         return changed;
 203         }
 204
 205         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 206                 i = hw_param_interval(params, k);
 207                 if (snd_interval_empty(i))
 208                         return -EINVAL;
 209                 if (!(params->rmask & (1 << k)))
 210                         continue;
 211 #ifdef RULES_DEBUG
 212                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 213                 if (i->empty)
 214                         printk("empty");
 215                 else
 216                         printk("%c%u %u%c",
 217                                i->openmin ? '(' : '[', i->min,
 218                                i->max, i->openmax ? ')' : ']');
 219                 printk(" -> ");
 220 #endif
 221                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 222 #ifdef RULES_DEBUG
 223                 if (i->empty)
 224                         printk("empty\n");
 225                 else
 226                         printk("%c%u %u%c\n",
 227                                i->openmin ? '(' : '[', i->min,
 228                                i->max, i->openmax ? ')' : ']');
 229 #endif
 230                 if (changed)
 231                         params->cmask |= 1 << k;
 232                 if (changed < 0)
 233                         return changed;
 234         }
 235
 236         for (k = 0; k < constrs->rules_num; k++)
 237                 rstamps[k] = 0;
 238         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 239                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 240         do {
 241                 again = 0;
 242                 for (k = 0; k < constrs->rules_num; k++) {
 243                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 244                         unsigned int d;
 245                         int doit = 0;
 246                         if (r->cond && !(r->cond & params->flags))
 247                                 continue;
 248                         for (d = 0; r->deps[d] >= 0; d++) {
 249                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 250                                         doit = 1;
 251                                         break;
 252                                 }
 253                         }
 254                         if (!doit)
 255                                 continue;
 256 #ifdef RULES_DEBUG
 257                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 258                         if (r->var >= 0) {
 259                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 260                                 if (hw_is_mask(r->var)) {
 261                                         m = hw_param_mask(params, r->var);
 262                                         printk("%x", *m->bits);
 263                                 } else {
 264                                         i = hw_param_interval(params, r->var);
 265                                         if (i->empty)
 266                                                 printk("empty");
 267                                         else
 268                                                 printk("%c%u %u%c",
 269                                                        i->openmin ? '(' : '[', i->min,
 270                                                        i->max, i->openmax ? ')' : ']');
 271                                 }
 272                         }
 273 #endif
 274                         changed = r->func(params, r);
 275 #ifdef RULES_DEBUG
 276                         if (r->var >= 0) {
 277                                 printk(" -> ");
 278                                 if (hw_is_mask(r->var))
 279                                         printk("%x", *m->bits);
 280                                 else {
 281                                         if (i->empty)
 282                                                 printk("empty");
 283                                         else
 284                                                 printk("%c%u %u%c",
 285                                                        i->openmin ? '(' : '[', i->min,
 286                                                        i->max, i->openmax ? ')' : ']');
 287                                 }
 288                         }
 289                         printk("\n");
 290 #endif
 291                         rstamps[k] = stamp;
 292                         if (changed && r->var >= 0) {
 293                                 params->cmask |= (1 << r->var);
 294                                 vstamps[r->var] = stamp;
 295                                 again = 1;
 296                         }
 297                         if (changed < 0)
 298                                 return changed;
 299                         stamp++;
 300                 }
 301         } while (again);
 302         if (!params->msbits) {
 303                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 304                 if (snd_interval_single(i))
 305                         params->msbits = snd_interval_value(i);
 306         }
 307
 308         if (!params->rate_den) {
 309                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 310                 if (snd_interval_single(i)) {
 311                         params->rate_num = snd_interval_value(i);
 312                         params->rate_den = 1;
 313                 }
 314         }
 315
 316         hw = &substream->runtime->hw;
 317         if (!params->info)
 318                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 319         if (!params->fifo_size) {
 320                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 321                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 322                 if (snd_mask_min(m) == snd_mask_max(m) &&
 323                     snd_interval_min(i) == snd_interval_max(i)) {
 324                         changed = substream->ops->ioctl(substream,
 325                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 326                         if (changed < 0)
 327                                 return changed;
 328                 }
 329         }
 330         params->rmask = 0;
 331         return 0;
 332 }
 333
 334 EXPORT_SYMBOL(snd_pcm_hw_refine);
 335
 336 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 337                                   struct snd_pcm_hw_params __user * _params)
 338 {
 339         struct snd_pcm_hw_params *params;
 340         int err;
 341
 342         params = memdup_user(_params, sizeof(*params));
 343         if (IS_ERR(params))
 344                 return PTR_ERR(params);
 345
 346         err = snd_pcm_hw_refine(substream, params);
 347         if (copy_to_user(_params, params, sizeof(*params))) {
 348                 if (!err)
 349                         err = -EFAULT;
 350         }
 351
 352         kfree(params);
 353         return err;
 354 }
 355
 356 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 357 {
 358         int usecs;
 359
 360         if (! runtime->rate)
 361                 return -1; /* invalid */
 362
 363         /* take 75% of period time as the deadline */
 364         usecs = (750000 / runtime->rate) * runtime->period_size;
 365         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 366                 runtime->rate;
 367
 368         return usecs;
 369 }
 370
 371 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state)
 372 {
 373         snd_pcm_stream_lock_irq(substream);
 374         if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED)
 375                 substream->runtime->status->state = state;
 376         snd_pcm_stream_unlock_irq(substream);
 377 }
 378
 379 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 380                              struct snd_pcm_hw_params *params)
 381 {
 382         struct snd_pcm_runtime *runtime;
 383         int err, usecs;
 384         unsigned int bits;
 385         snd_pcm_uframes_t frames;
 386
 387         if (PCM_RUNTIME_CHECK(substream))
 388                 return -ENXIO;
 389         runtime = substream->runtime;
 390         snd_pcm_stream_lock_irq(substream);
 391         switch (runtime->status->state) {
 392         case SNDRV_PCM_STATE_OPEN:
 393         case SNDRV_PCM_STATE_SETUP:
 394         case SNDRV_PCM_STATE_PREPARED:
 395                 break;
 396         default:
 397                 snd_pcm_stream_unlock_irq(substream);
 398                 return -EBADFD;
 399         }
 400         snd_pcm_stream_unlock_irq(substream);
 401 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 402         if (!substream->oss.oss)
 403 #endif
 404                 if (atomic_read(&substream->mmap_count))
 405                         return -EBADFD;
 406
 407         params->rmask = ~0U;
 408         err = snd_pcm_hw_refine(substream, params);
 409         if (err < 0)
 410                 goto _error;
 411
 412         err = snd_pcm_hw_params_choose(substream, params);
 413         if (err < 0)
 414                 goto _error;
 415
 416         if (substream->ops->hw_params != NULL) {
 417                 err = substream->ops->hw_params(substream, params);
 418                 if (err < 0)
 419                         goto _error;
 420         }
 421
 422         runtime->access = params_access(params);
 423         runtime->format = params_format(params);
 424         runtime->subformat = params_subformat(params);
 425         runtime->channels = params_channels(params);
 426         runtime->rate = params_rate(params);
 427         runtime->period_size = params_period_size(params);
 428         runtime->periods = params_periods(params);
 429         runtime->buffer_size = params_buffer_size(params);
 430         runtime->info = params->info;
 431         runtime->rate_num = params->rate_num;
 432         runtime->rate_den = params->rate_den;
 433         runtime->no_period_wakeup =
 434                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 435                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 436
 437         bits = snd_pcm_format_physical_width(runtime->format);
 438         runtime->sample_bits = bits;
 439         bits *= runtime->channels;
 440         runtime->frame_bits = bits;
 441         frames = 1;
 442         while (bits % 8 != 0) {
 443                 bits *= 2;
 444                 frames *= 2;
 445         }
 446         runtime->byte_align = bits / 8;
 447         runtime->min_align = frames;
 448
 449         /* Default sw params */
 450         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 451         runtime->period_step = 1;
 452         runtime->control->avail_min = runtime->period_size;
 453         runtime->start_threshold = 1;
 454         runtime->stop_threshold = runtime->buffer_size;
 455         runtime->silence_threshold = 0;
 456         runtime->silence_size = 0;
 457         runtime->boundary = runtime->buffer_size;
 458         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 459                 runtime->boundary *= 2;
 460
 461         snd_pcm_timer_resolution_change(substream);
 462         snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
 463
 464         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 465                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 466         if ((usecs = period_to_usecs(runtime)) >= 0)
 467                 pm_qos_add_request(&substream->latency_pm_qos_req,
 468                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 469         return 0;
 470  _error:
 471         /* hardware might be unusable from this time,
 472            so we force application to retry to set
 473            the correct hardware parameter settings */
 474         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 475         if (substream->ops->hw_free != NULL)
 476                 substream->ops->hw_free(substream);
 477         return err;
 478 }
 479
 480 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 481                                   struct snd_pcm_hw_params __user * _params)
 482 {
 483         struct snd_pcm_hw_params *params;
 484         int err;
 485
 486         params = memdup_user(_params, sizeof(*params));
 487         if (IS_ERR(params))
 488                 return PTR_ERR(params);
 489
 490         err = snd_pcm_hw_params(substream, params);
 491         if (copy_to_user(_params, params, sizeof(*params))) {
 492                 if (!err)
 493                         err = -EFAULT;
 494         }
 495
 496         kfree(params);
 497         return err;
 498 }
 499
 500 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 501 {
 502         struct snd_pcm_runtime *runtime;
 503         int result = 0;
 504
 505         if (PCM_RUNTIME_CHECK(substream))
 506                 return -ENXIO;
 507         runtime = substream->runtime;
 508         snd_pcm_stream_lock_irq(substream);
 509         switch (runtime->status->state) {
 510         case SNDRV_PCM_STATE_SETUP:
 511         case SNDRV_PCM_STATE_PREPARED:
 512                 break;
 513         default:
 514                 snd_pcm_stream_unlock_irq(substream);
 515                 return -EBADFD;
 516         }
 517         snd_pcm_stream_unlock_irq(substream);
 518         if (atomic_read(&substream->mmap_count))
 519                 return -EBADFD;
 520         if (substream->ops->hw_free)
 521                 result = substream->ops->hw_free(substream);
 522         snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
 523         pm_qos_remove_request(&substream->latency_pm_qos_req);
 524         return result;
 525 }
 526
 527 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 528                              struct snd_pcm_sw_params *params)
 529 {
 530         struct snd_pcm_runtime *runtime;
 531         int err;
 532
 533         if (PCM_RUNTIME_CHECK(substream))
 534                 return -ENXIO;
 535         runtime = substream->runtime;
 536         snd_pcm_stream_lock_irq(substream);
 537         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 538                 snd_pcm_stream_unlock_irq(substream);
 539                 return -EBADFD;
 540         }
 541         snd_pcm_stream_unlock_irq(substream);
 542
 543         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 544                 return -EINVAL;
 545         if (params->avail_min == 0)
 546                 return -EINVAL;
 547         if (params->silence_size >= runtime->boundary) {
 548                 if (params->silence_threshold != 0)
 549                         return -EINVAL;
 550         } else {
 551                 if (params->silence_size > params->silence_threshold)
 552                         return -EINVAL;
 553                 if (params->silence_threshold > runtime->buffer_size)
 554                         return -EINVAL;
 555         }
 556         err = 0;
 557         snd_pcm_stream_lock_irq(substream);
 558         runtime->tstamp_mode = params->tstamp_mode;
 559         runtime->period_step = params->period_step;
 560         runtime->control->avail_min = params->avail_min;
 561         runtime->start_threshold = params->start_threshold;
 562         runtime->stop_threshold = params->stop_threshold;
 563         runtime->silence_threshold = params->silence_threshold;
 564         runtime->silence_size = params->silence_size;
 565         params->boundary = runtime->boundary;
 566         if (snd_pcm_running(substream)) {
 567                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 568                     runtime->silence_size > 0)
 569                         snd_pcm_playback_silence(substream, ULONG_MAX);
 570                 err = snd_pcm_update_state(substream, runtime);
 571         }
 572         snd_pcm_stream_unlock_irq(substream);
 573         return err;
 574 }
 575
 576 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 577                                   struct snd_pcm_sw_params __user * _params)
 578 {
 579         struct snd_pcm_sw_params params;
 580         int err;
 581         if (copy_from_user(&params, _params, sizeof(params)))
 582                 return -EFAULT;
 583         err = snd_pcm_sw_params(substream, &params);
 584         if (copy_to_user(_params, &params, sizeof(params)))
 585                 return -EFAULT;
 586         return err;
 587 }
 588
 589 int snd_pcm_status(struct snd_pcm_substream *substream,
 590                    struct snd_pcm_status *status)
 591 {
 592         struct snd_pcm_runtime *runtime = substream->runtime;
 593
 594         snd_pcm_stream_lock_irq(substream);
 595         status->state = runtime->status->state;
 596         status->suspended_state = runtime->status->suspended_state;
 597         if (status->state == SNDRV_PCM_STATE_OPEN)
 598                 goto _end;
 599         status->trigger_tstamp = runtime->trigger_tstamp;
 600         if (snd_pcm_running(substream)) {
 601                 snd_pcm_update_hw_ptr(substream);
 602                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 603                         status->tstamp = runtime->status->tstamp;
 604                         goto _tstamp_end;
 605                 }
 606         }
 607         snd_pcm_gettime(runtime, &status->tstamp);
 608  _tstamp_end:
 609         status->appl_ptr = runtime->control->appl_ptr;
 610         status->hw_ptr = runtime->status->hw_ptr;
 611         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 612                 status->avail = snd_pcm_playback_avail(runtime);
 613                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 614                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 615                         status->delay = runtime->buffer_size - status->avail;
 616                         status->delay += runtime->delay;
 617                 } else
 618                         status->delay = 0;
 619         } else {
 620                 status->avail = snd_pcm_capture_avail(runtime);
 621                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 622                         status->delay = status->avail + runtime->delay;
 623                 else
 624                         status->delay = 0;
 625         }
 626         status->avail_max = runtime->avail_max;
 627         status->overrange = runtime->overrange;
 628         runtime->avail_max = 0;
 629         runtime->overrange = 0;
 630  _end:
 631         snd_pcm_stream_unlock_irq(substream);
 632         return 0;
 633 }
 634
 635 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 636                                struct snd_pcm_status __user * _status)
 637 {
 638         struct snd_pcm_status status;
 639         int res;
 640
 641         memset(&status, 0, sizeof(status));
 642         res = snd_pcm_status(substream, &status);
 643         if (res < 0)
 644                 return res;
 645         if (copy_to_user(_status, &status, sizeof(status)))
 646                 return -EFAULT;
 647         return 0;
 648 }
 649
 650 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 651                                 struct snd_pcm_channel_info * info)
 652 {
 653         struct snd_pcm_runtime *runtime;
 654         unsigned int channel;
 655
 656         channel = info->channel;
 657         runtime = substream->runtime;
 658         snd_pcm_stream_lock_irq(substream);
 659         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 660                 snd_pcm_stream_unlock_irq(substream);
 661                 return -EBADFD;
 662         }
 663         snd_pcm_stream_unlock_irq(substream);
 664         if (channel >= runtime->channels)
 665                 return -EINVAL;
 666         memset(info, 0, sizeof(*info));
 667         info->channel = channel;
 668         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 669 }
 670
 671 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 672                                      struct snd_pcm_channel_info __user * _info)
 673 {
 674         struct snd_pcm_channel_info info;
 675         int res;
 676
 677         if (copy_from_user(&info, _info, sizeof(info)))
 678                 return -EFAULT;
 679         res = snd_pcm_channel_info(substream, &info);
 680         if (res < 0)
 681                 return res;
 682         if (copy_to_user(_info, &info, sizeof(info)))
 683                 return -EFAULT;
 684         return 0;
 685 }
 686
 687 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 688 {
 689         struct snd_pcm_runtime *runtime = substream->runtime;
 690         if (runtime->trigger_master == NULL)
 691                 return;
 692         if (runtime->trigger_master == substream) {
 693                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 694         } else {
 695                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 696                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 697         }
 698         runtime->trigger_master = NULL;
 699 }
 700
 701 struct action_ops {
 702         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 703         int (*do_action)(struct snd_pcm_substream *substream, int state);
 704         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 705         void (*post_action)(struct snd_pcm_substream *substream, int state);
 706 };
 707
 708 /*
 709  *  this functions is core for handling of linked stream
 710  *  Note: the stream state might be changed also on failure
 711  *  Note2: call with calling stream lock + link lock
 712  */
 713 static int snd_pcm_action_group(struct action_ops *ops,
 714                                 struct snd_pcm_substream *substream,
 715                                 int state, int do_lock)
 716 {
 717         struct snd_pcm_substream *s = NULL;
 718         struct snd_pcm_substream *s1;
 719         int res = 0;
 720
 721         snd_pcm_group_for_each_entry(s, substream) {
 722                 if (do_lock && s != substream)
 723                         spin_lock_nested(&s->self_group.lock,
 724                                          SINGLE_DEPTH_NESTING);
 725                 res = ops->pre_action(s, state);
 726                 if (res < 0)
 727                         goto _unlock;
 728         }
 729         snd_pcm_group_for_each_entry(s, substream) {
 730                 res = ops->do_action(s, state);
 731                 if (res < 0) {
 732                         if (ops->undo_action) {
 733                                 snd_pcm_group_for_each_entry(s1, substream) {
 734                                         if (s1 == s) /* failed stream */
 735                                                 break;
 736                                         ops->undo_action(s1, state);
 737                                 }
 738                         }
 739                         s = NULL; /* unlock all */
 740                         goto _unlock;
 741                 }
 742         }
 743         snd_pcm_group_for_each_entry(s, substream) {
 744                 ops->post_action(s, state);
 745         }
 746  _unlock:
 747         if (do_lock) {
 748                 /* unlock streams */
 749                 snd_pcm_group_for_each_entry(s1, substream) {
 750                         if (s1 != substream)
 751                                 spin_unlock(&s1->self_group.lock);
 752                         if (s1 == s)    /* end */
 753                                 break;
 754                 }
 755         }
 756         return res;
 757 }
 758
 759 /*
 760  *  Note: call with stream lock
 761  */
 762 static int snd_pcm_action_single(struct action_ops *ops,
 763                                  struct snd_pcm_substream *substream,
 764                                  int state)
 765 {
 766         int res;
 767
 768         res = ops->pre_action(substream, state);
 769         if (res < 0)
 770                 return res;
 771         res = ops->do_action(substream, state);
 772         if (res == 0)
 773                 ops->post_action(substream, state);
 774         else if (ops->undo_action)
 775                 ops->undo_action(substream, state);
 776         return res;
 777 }
 778
 779 /*
 780  *  Note: call with stream lock
 781  */
 782 static int snd_pcm_action(struct action_ops *ops,
 783                           struct snd_pcm_substream *substream,
 784                           int state)
 785 {
 786         int res;
 787
 788         if (snd_pcm_stream_linked(substream)) {
 789                 if (!spin_trylock(&substream->group->lock)) {
 790                         spin_unlock(&substream->self_group.lock);
 791                         spin_lock(&substream->group->lock);
 792                         spin_lock(&substream->self_group.lock);
 793                 }
 794                 res = snd_pcm_action_group(ops, substream, state, 1);
 795                 spin_unlock(&substream->group->lock);
 796         } else {
 797                 res = snd_pcm_action_single(ops, substream, state);
 798         }
 799         return res;
 800 }
 801
 802 /*
 803  *  Note: don't use any locks before
 804  */
 805 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 806                                    struct snd_pcm_substream *substream,
 807                                    int state)
 808 {
 809         int res;
 810
 811         read_lock_irq(&snd_pcm_link_rwlock);
 812         if (snd_pcm_stream_linked(substream)) {
 813                 spin_lock(&substream->group->lock);
 814                 spin_lock(&substream->self_group.lock);
 815                 res = snd_pcm_action_group(ops, substream, state, 1);
 816                 spin_unlock(&substream->self_group.lock);
 817                 spin_unlock(&substream->group->lock);
 818         } else {
 819                 spin_lock(&substream->self_group.lock);
 820                 res = snd_pcm_action_single(ops, substream, state);
 821                 spin_unlock(&substream->self_group.lock);
 822         }
 823         read_unlock_irq(&snd_pcm_link_rwlock);
 824         return res;
 825 }
 826
 827 /*
 828  */
 829 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 830                                     struct snd_pcm_substream *substream,
 831                                     int state)
 832 {
 833         int res;
 834
 835         down_read(&snd_pcm_link_rwsem);
 836         if (snd_pcm_stream_linked(substream))
 837                 res = snd_pcm_action_group(ops, substream, state, 0);
 838         else
 839                 res = snd_pcm_action_single(ops, substream, state);
 840         up_read(&snd_pcm_link_rwsem);
 841         return res;
 842 }
 843
 844 /*
 845  * start callbacks
 846  */
 847 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 848 {
 849         struct snd_pcm_runtime *runtime = substream->runtime;
 850         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 851                 return -EBADFD;
 852         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 853             !snd_pcm_playback_data(substream))
 854                 return -EPIPE;
 855         runtime->trigger_master = substream;
 856         return 0;
 857 }
 858
 859 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 860 {
 861         if (substream->runtime->trigger_master != substream)
 862                 return 0;
 863         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 864 }
 865
 866 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 867 {
 868         if (substream->runtime->trigger_master == substream)
 869                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 870 }
 871
 872 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 873 {
 874         struct snd_pcm_runtime *runtime = substream->runtime;
 875         snd_pcm_trigger_tstamp(substream);
 876         runtime->hw_ptr_jiffies = jiffies;
 877         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 878                                                             runtime->rate;
 879         runtime->status->state = state;
 880         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 881             runtime->silence_size > 0)
 882                 snd_pcm_playback_silence(substream, ULONG_MAX);
 883         if (substream->timer)
 884                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 885                                  &runtime->trigger_tstamp);
 886 }
 887
 888 static struct action_ops snd_pcm_action_start = {
 889         .pre_action = snd_pcm_pre_start,
 890         .do_action = snd_pcm_do_start,
 891         .undo_action = snd_pcm_undo_start,
 892         .post_action = snd_pcm_post_start
 893 };
 894
 895 /**
 896  * snd_pcm_start - start all linked streams
 897  * @substream: the PCM substream instance
 898  */
 899 int snd_pcm_start(struct snd_pcm_substream *substream)
 900 {
 901         return snd_pcm_action(&snd_pcm_action_start, substream,
 902                               SNDRV_PCM_STATE_RUNNING);
 903 }
 904
 905 /*
 906  * stop callbacks
 907  */
 908 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 909 {
 910         struct snd_pcm_runtime *runtime = substream->runtime;
 911         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 912                 return -EBADFD;
 913         runtime->trigger_master = substream;
 914         return 0;
 915 }
 916
 917 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 918 {
 919         if (substream->runtime->trigger_master == substream &&
 920             snd_pcm_running(substream))
 921                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 922         return 0; /* unconditonally stop all substreams */
 923 }
 924
 925 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 926 {
 927         struct snd_pcm_runtime *runtime = substream->runtime;
 928         if (runtime->status->state != state) {
 929                 snd_pcm_trigger_tstamp(substream);
 930                 if (substream->timer)
 931                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 932                                          &runtime->trigger_tstamp);
 933                 runtime->status->state = state;
 934         }
 935         wake_up(&runtime->sleep);
 936         wake_up(&runtime->tsleep);
 937 }
 938
 939 static struct action_ops snd_pcm_action_stop = {
 940         .pre_action = snd_pcm_pre_stop,
 941         .do_action = snd_pcm_do_stop,
 942         .post_action = snd_pcm_post_stop
 943 };
 944
 945 /**
 946  * snd_pcm_stop - try to stop all running streams in the substream group
 947  * @substream: the PCM substream instance
 948  * @state: PCM state after stopping the stream
 949  *
 950  * The state of each stream is then changed to the given state unconditionally.
 951  */
 952 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
 953 {
 954         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 955 }
 956
 957 EXPORT_SYMBOL(snd_pcm_stop);
 958
 959 /**
 960  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 961  * @substream: the PCM substream
 962  *
 963  * After stopping, the state is changed to SETUP.
 964  * Unlike snd_pcm_stop(), this affects only the given stream.
 965  */
 966 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 967 {
 968         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 969                                      SNDRV_PCM_STATE_SETUP);
 970 }
 971
 972 /*
 973  * pause callbacks
 974  */
 975 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 976 {
 977         struct snd_pcm_runtime *runtime = substream->runtime;
 978         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 979                 return -ENOSYS;
 980         if (push) {
 981                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 982                         return -EBADFD;
 983         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 984                 return -EBADFD;
 985         runtime->trigger_master = substream;
 986         return 0;
 987 }
 988
 989 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 990 {
 991         if (substream->runtime->trigger_master != substream)
 992                 return 0;
 993         /* some drivers might use hw_ptr to recover from the pause -
 994            update the hw_ptr now */
 995         if (push)
 996                 snd_pcm_update_hw_ptr(substream);
 997         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 998          * a delta between the current jiffies, this gives a large enough
 999          * delta, effectively to skip the check once.
1000          */
1001         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1002         return substream->ops->trigger(substream,
1003                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1004                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1005 }
1006
1007 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1008 {
1009         if (substream->runtime->trigger_master == substream)
1010                 substream->ops->trigger(substream,
1011                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1012                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1013 }
1014
1015 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1016 {
1017         struct snd_pcm_runtime *runtime = substream->runtime;
1018         snd_pcm_trigger_tstamp(substream);
1019         if (push) {
1020                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1021                 if (substream->timer)
1022                         snd_timer_notify(substream->timer,
1023                                          SNDRV_TIMER_EVENT_MPAUSE,
1024                                          &runtime->trigger_tstamp);
1025                 wake_up(&runtime->sleep);
1026                 wake_up(&runtime->tsleep);
1027         } else {
1028                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1029                 if (substream->timer)
1030                         snd_timer_notify(substream->timer,
1031                                          SNDRV_TIMER_EVENT_MCONTINUE,
1032                                          &runtime->trigger_tstamp);
1033         }
1034 }
1035
1036 static struct action_ops snd_pcm_action_pause = {
1037         .pre_action = snd_pcm_pre_pause,
1038         .do_action = snd_pcm_do_pause,
1039         .undo_action = snd_pcm_undo_pause,
1040         .post_action = snd_pcm_post_pause
1041 };
1042
1043 /*
1044  * Push/release the pause for all linked streams.
1045  */
1046 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1047 {
1048         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1049 }
1050
1051 #ifdef CONFIG_PM
1052 /* suspend */
1053
1054 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1055 {
1056         struct snd_pcm_runtime *runtime = substream->runtime;
1057         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1058                 return -EBUSY;
1059         runtime->trigger_master = substream;
1060         return 0;
1061 }
1062
1063 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1064 {
1065         struct snd_pcm_runtime *runtime = substream->runtime;
1066         if (runtime->trigger_master != substream)
1067                 return 0;
1068         if (! snd_pcm_running(substream))
1069                 return 0;
1070         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1071         return 0; /* suspend unconditionally */
1072 }
1073
1074 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1075 {
1076         struct snd_pcm_runtime *runtime = substream->runtime;
1077         snd_pcm_trigger_tstamp(substream);
1078         if (substream->timer)
1079                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1080                                  &runtime->trigger_tstamp);
1081         runtime->status->suspended_state = runtime->status->state;
1082         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1083         wake_up(&runtime->sleep);
1084         wake_up(&runtime->tsleep);
1085 }
1086
1087 static struct action_ops snd_pcm_action_suspend = {
1088         .pre_action = snd_pcm_pre_suspend,
1089         .do_action = snd_pcm_do_suspend,
1090         .post_action = snd_pcm_post_suspend
1091 };
1092
1093 /**
1094  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1095  * @substream: the PCM substream
1096  *
1097  * After this call, all streams are changed to SUSPENDED state.
1098  */
1099 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1100 {
1101         int err;
1102         unsigned long flags;
1103
1104         if (! substream)
1105                 return 0;
1106
1107         snd_pcm_stream_lock_irqsave(substream, flags);
1108         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1109         snd_pcm_stream_unlock_irqrestore(substream, flags);
1110         return err;
1111 }
1112
1113 EXPORT_SYMBOL(snd_pcm_suspend);
1114
1115 /**
1116  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1117  * @pcm: the PCM instance
1118  *
1119  * After this call, all streams are changed to SUSPENDED state.
1120  */
1121 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1122 {
1123         struct snd_pcm_substream *substream;
1124         int stream, err = 0;
1125
1126         if (! pcm)
1127                 return 0;
1128
1129         for (stream = 0; stream < 2; stream++) {
1130                 for (substream = pcm->streams[stream].substream;
1131                      substream; substream = substream->next) {
1132                         /* FIXME: the open/close code should lock this as well */
1133                         if (substream->runtime == NULL)
1134                                 continue;
1135                         err = snd_pcm_suspend(substream);
1136                         if (err < 0 && err != -EBUSY)
1137                                 return err;
1138                 }
1139         }
1140         return 0;
1141 }
1142
1143 EXPORT_SYMBOL(snd_pcm_suspend_all);
1144
1145 /* resume */
1146
1147 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1148 {
1149         struct snd_pcm_runtime *runtime = substream->runtime;
1150         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1151                 return -ENOSYS;
1152         runtime->trigger_master = substream;
1153         return 0;
1154 }
1155
1156 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1157 {
1158         struct snd_pcm_runtime *runtime = substream->runtime;
1159         if (runtime->trigger_master != substream)
1160                 return 0;
1161         /* DMA not running previously? */
1162         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1163             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1164              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1165                 return 0;
1166         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1167 }
1168
1169 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1170 {
1171         if (substream->runtime->trigger_master == substream &&
1172             snd_pcm_running(substream))
1173                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1174 }
1175
1176 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1177 {
1178         struct snd_pcm_runtime *runtime = substream->runtime;
1179         snd_pcm_trigger_tstamp(substream);
1180         if (substream->timer)
1181                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1182                                  &runtime->trigger_tstamp);
1183         runtime->status->state = runtime->status->suspended_state;
1184 }
1185
1186 static struct action_ops snd_pcm_action_resume = {
1187         .pre_action = snd_pcm_pre_resume,
1188         .do_action = snd_pcm_do_resume,
1189         .undo_action = snd_pcm_undo_resume,
1190         .post_action = snd_pcm_post_resume
1191 };
1192
1193 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1194 {
1195         struct snd_card *card = substream->pcm->card;
1196         int res;
1197
1198         snd_power_lock(card);
1199         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1200                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1201         snd_power_unlock(card);
1202         return res;
1203 }
1204
1205 #else
1206
1207 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1208 {
1209         return -ENOSYS;
1210 }
1211
1212 #endif /* CONFIG_PM */
1213
1214 /*
1215  * xrun ioctl
1216  *
1217  * Change the RUNNING stream(s) to XRUN state.
1218  */
1219 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1220 {
1221         struct snd_card *card = substream->pcm->card;
1222         struct snd_pcm_runtime *runtime = substream->runtime;
1223         int result;
1224
1225         snd_power_lock(card);
1226         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1227                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1228                 if (result < 0)
1229                         goto _unlock;
1230         }
1231
1232         snd_pcm_stream_lock_irq(substream);
1233         switch (runtime->status->state) {
1234         case SNDRV_PCM_STATE_XRUN:
1235                 result = 0;     /* already there */
1236                 break;
1237         case SNDRV_PCM_STATE_RUNNING:
1238                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1239                 break;
1240         default:
1241                 result = -EBADFD;
1242         }
1243         snd_pcm_stream_unlock_irq(substream);
1244  _unlock:
1245         snd_power_unlock(card);
1246         return result;
1247 }
1248
1249 /*
1250  * reset ioctl
1251  */
1252 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1253 {
1254         struct snd_pcm_runtime *runtime = substream->runtime;
1255         switch (runtime->status->state) {
1256         case SNDRV_PCM_STATE_RUNNING:
1257         case SNDRV_PCM_STATE_PREPARED:
1258         case SNDRV_PCM_STATE_PAUSED:
1259         case SNDRV_PCM_STATE_SUSPENDED:
1260                 return 0;
1261         default:
1262                 return -EBADFD;
1263         }
1264 }
1265
1266 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1267 {
1268         struct snd_pcm_runtime *runtime = substream->runtime;
1269         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1270         if (err < 0)
1271                 return err;
1272         runtime->hw_ptr_base = 0;
1273         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1274                 runtime->status->hw_ptr % runtime->period_size;
1275         runtime->silence_start = runtime->status->hw_ptr;
1276         runtime->silence_filled = 0;
1277         return 0;
1278 }
1279
1280 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1281 {
1282         struct snd_pcm_runtime *runtime = substream->runtime;
1283         runtime->control->appl_ptr = runtime->status->hw_ptr;
1284         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1285             runtime->silence_size > 0)
1286                 snd_pcm_playback_silence(substream, ULONG_MAX);
1287 }
1288
1289 static struct action_ops snd_pcm_action_reset = {
1290         .pre_action = snd_pcm_pre_reset,
1291         .do_action = snd_pcm_do_reset,
1292         .post_action = snd_pcm_post_reset
1293 };
1294
1295 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1296 {
1297         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1298 }
1299
1300 /*
1301  * prepare ioctl
1302  */
1303 /* we use the second argument for updating f_flags */
1304 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1305                                int f_flags)
1306 {
1307         struct snd_pcm_runtime *runtime = substream->runtime;
1308         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1309             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1310                 return -EBADFD;
1311         if (snd_pcm_running(substream))
1312                 return -EBUSY;
1313         substream->f_flags = f_flags;
1314         return 0;
1315 }
1316
1317 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1318 {
1319         int err;
1320         err = substream->ops->prepare(substream);
1321         if (err < 0)
1322                 return err;
1323         return snd_pcm_do_reset(substream, 0);
1324 }
1325
1326 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1327 {
1328         struct snd_pcm_runtime *runtime = substream->runtime;
1329         runtime->control->appl_ptr = runtime->status->hw_ptr;
1330         snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED);
1331 }
1332
1333 static struct action_ops snd_pcm_action_prepare = {
1334         .pre_action = snd_pcm_pre_prepare,
1335         .do_action = snd_pcm_do_prepare,
1336         .post_action = snd_pcm_post_prepare
1337 };
1338
1339 /**
1340  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1341  * @substream: the PCM substream instance
1342  * @file: file to refer f_flags
1343  */
1344 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1345                            struct file *file)
1346 {
1347         int res;
1348         struct snd_card *card = substream->pcm->card;
1349         int f_flags;
1350
1351         if (file)
1352                 f_flags = file->f_flags;
1353         else
1354                 f_flags = substream->f_flags;
1355
1356         snd_power_lock(card);
1357         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1358                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1359                                                substream, f_flags);
1360         snd_power_unlock(card);
1361         return res;
1362 }
1363
1364 /*
1365  * drain ioctl
1366  */
1367
1368 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1369 {
1370         substream->runtime->trigger_master = substream;
1371         return 0;
1372 }
1373
1374 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1375 {
1376         struct snd_pcm_runtime *runtime = substream->runtime;
1377         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1378                 switch (runtime->status->state) {
1379                 case SNDRV_PCM_STATE_PREPARED:
1380                         /* start playback stream if possible */
1381                         if (! snd_pcm_playback_empty(substream)) {
1382                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1383                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1384                         }
1385                         break;
1386                 case SNDRV_PCM_STATE_RUNNING:
1387                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1388                         break;
1389                 default:
1390                         break;
1391                 }
1392         } else {
1393                 /* stop running stream */
1394                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1395                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1396                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1397                         snd_pcm_do_stop(substream, new_state);
1398                         snd_pcm_post_stop(substream, new_state);
1399                 }
1400         }
1401         return 0;
1402 }
1403
1404 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1405 {
1406 }
1407
1408 static struct action_ops snd_pcm_action_drain_init = {
1409         .pre_action = snd_pcm_pre_drain_init,
1410         .do_action = snd_pcm_do_drain_init,
1411         .post_action = snd_pcm_post_drain_init
1412 };
1413
1414 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1415
1416 /*
1417  * Drain the stream(s).
1418  * When the substream is linked, sync until the draining of all playback streams
1419  * is finished.
1420  * After this call, all streams are supposed to be either SETUP or DRAINING
1421  * (capture only) state.
1422  */
1423 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1424                          struct file *file)
1425 {
1426         struct snd_card *card;
1427         struct snd_pcm_runtime *runtime;
1428         struct snd_pcm_substream *s;
1429         wait_queue_t wait;
1430         int result = 0;
1431         int nonblock = 0;
1432
1433         card = substream->pcm->card;
1434         runtime = substream->runtime;
1435
1436         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1437                 return -EBADFD;
1438
1439         snd_power_lock(card);
1440         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1441                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1442                 if (result < 0) {
1443                         snd_power_unlock(card);
1444                         return result;
1445                 }
1446         }
1447
1448         if (file) {
1449                 if (file->f_flags & O_NONBLOCK)
1450                         nonblock = 1;
1451         } else if (substream->f_flags & O_NONBLOCK)
1452                 nonblock = 1;
1453
1454         down_read(&snd_pcm_link_rwsem);
1455         snd_pcm_stream_lock_irq(substream);
1456         /* resume pause */
1457         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1458                 snd_pcm_pause(substream, 0);
1459
1460         /* pre-start/stop - all running streams are changed to DRAINING state */
1461         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1462         if (result < 0)
1463                 goto unlock;
1464         /* in non-blocking, we don't wait in ioctl but let caller poll */
1465         if (nonblock) {
1466                 result = -EAGAIN;
1467                 goto unlock;
1468         }
1469
1470         for (;;) {
1471                 long tout;
1472                 struct snd_pcm_runtime *to_check;
1473                 if (signal_pending(current)) {
1474                         result = -ERESTARTSYS;
1475                         break;
1476                 }
1477                 /* find a substream to drain */
1478                 to_check = NULL;
1479                 snd_pcm_group_for_each_entry(s, substream) {
1480                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1481                                 continue;
1482                         runtime = s->runtime;
1483                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1484                                 to_check = runtime;
1485                                 break;
1486                         }
1487                 }
1488                 if (!to_check)
1489                         break; /* all drained */
1490                 init_waitqueue_entry(&wait, current);
1491                 add_wait_queue(&to_check->sleep, &wait);
1492                 snd_pcm_stream_unlock_irq(substream);
1493                 up_read(&snd_pcm_link_rwsem);
1494                 snd_power_unlock(card);
1495                 if (runtime->no_period_wakeup)
1496                         tout = MAX_SCHEDULE_TIMEOUT;
1497                 else {
1498                         tout = 10;
1499                         if (runtime->rate) {
1500                                 long t = runtime->period_size * 2 / runtime->rate;
1501                                 tout = max(t, tout);
1502                         }
1503                         tout = msecs_to_jiffies(tout * 1000);
1504                 }
1505                 tout = schedule_timeout_interruptible(tout);
1506                 snd_power_lock(card);
1507                 down_read(&snd_pcm_link_rwsem);
1508                 snd_pcm_stream_lock_irq(substream);
1509                 remove_wait_queue(&to_check->sleep, &wait);
1510                 if (tout == 0) {
1511                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1512                                 result = -ESTRPIPE;
1513                         else {
1514                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1515                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1516                                 result = -EIO;
1517                         }
1518                         break;
1519                 }
1520         }
1521
1522  unlock:
1523         snd_pcm_stream_unlock_irq(substream);
1524         up_read(&snd_pcm_link_rwsem);
1525         snd_power_unlock(card);
1526
1527         return result;
1528 }
1529
1530 /*
1531  * drop ioctl
1532  *
1533  * Immediately put all linked substreams into SETUP state.
1534  */
1535 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1536 {
1537         struct snd_pcm_runtime *runtime;
1538         int result = 0;
1539
1540         if (PCM_RUNTIME_CHECK(substream))
1541                 return -ENXIO;
1542         runtime = substream->runtime;
1543
1544         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1545             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1546             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1547                 return -EBADFD;
1548
1549         snd_pcm_stream_lock_irq(substream);
1550         /* resume pause */
1551         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1552                 snd_pcm_pause(substream, 0);
1553
1554         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1555         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1556         snd_pcm_stream_unlock_irq(substream);
1557
1558         return result;
1559 }
1560
1561
1562 /* WARNING: Don't forget to fput back the file */
1563 static struct file *snd_pcm_file_fd(int fd)
1564 {
1565         struct file *file;
1566         struct inode *inode;
1567         unsigned int minor;
1568
1569         file = fget(fd);
1570         if (!file)
1571                 return NULL;
1572         inode = file->f_path.dentry->d_inode;
1573         if (!S_ISCHR(inode->i_mode) ||
1574             imajor(inode) != snd_major) {
1575                 fput(file);
1576                 return NULL;
1577         }
1578         minor = iminor(inode);
1579         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1580             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1581                 fput(file);
1582                 return NULL;
1583         }
1584         return file;
1585 }
1586
1587 /*
1588  * PCM link handling
1589  */
1590 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1591 {
1592         int res = 0;
1593         struct file *file;
1594         struct snd_pcm_file *pcm_file;
1595         struct snd_pcm_substream *substream1;
1596
1597         file = snd_pcm_file_fd(fd);
1598         if (!file)
1599                 return -EBADFD;
1600         pcm_file = file->private_data;
1601         substream1 = pcm_file->substream;
1602         down_write(&snd_pcm_link_rwsem);
1603         write_lock_irq(&snd_pcm_link_rwlock);
1604         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1605             substream->runtime->status->state != substream1->runtime->status->state) {
1606                 res = -EBADFD;
1607                 goto _end;
1608         }
1609         if (snd_pcm_stream_linked(substream1)) {
1610                 res = -EALREADY;
1611                 goto _end;
1612         }
1613         if (!snd_pcm_stream_linked(substream)) {
1614                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1615                 if (substream->group == NULL) {
1616                         res = -ENOMEM;
1617                         goto _end;
1618                 }
1619                 spin_lock_init(&substream->group->lock);
1620                 INIT_LIST_HEAD(&substream->group->substreams);
1621                 list_add_tail(&substream->link_list, &substream->group->substreams);
1622                 substream->group->count = 1;
1623         }
1624         list_add_tail(&substream1->link_list, &substream->group->substreams);
1625         substream->group->count++;
1626         substream1->group = substream->group;
1627  _end:
1628         write_unlock_irq(&snd_pcm_link_rwlock);
1629         up_write(&snd_pcm_link_rwsem);
1630         snd_card_unref(substream1->pcm->card);
1631         fput(file);
1632         return res;
1633 }
1634
1635 static void relink_to_local(struct snd_pcm_substream *substream)
1636 {
1637         substream->group = &substream->self_group;
1638         INIT_LIST_HEAD(&substream->self_group.substreams);
1639         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1640 }
1641
1642 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1643 {
1644         struct snd_pcm_substream *s;
1645         int res = 0;
1646
1647         down_write(&snd_pcm_link_rwsem);
1648         write_lock_irq(&snd_pcm_link_rwlock);
1649         if (!snd_pcm_stream_linked(substream)) {
1650                 res = -EALREADY;
1651                 goto _end;
1652         }
1653         list_del(&substream->link_list);
1654         substream->group->count--;
1655         if (substream->group->count == 1) {     /* detach the last stream, too */
1656                 snd_pcm_group_for_each_entry(s, substream) {
1657                         relink_to_local(s);
1658                         break;
1659                 }
1660                 kfree(substream->group);
1661         }
1662         relink_to_local(substream);
1663        _end:
1664         write_unlock_irq(&snd_pcm_link_rwlock);
1665         up_write(&snd_pcm_link_rwsem);
1666         return res;
1667 }
1668
1669 /*
1670  * hw configurator
1671  */
1672 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1673                                struct snd_pcm_hw_rule *rule)
1674 {
1675         struct snd_interval t;
1676         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1677                      hw_param_interval_c(params, rule->deps[1]), &t);
1678         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1679 }
1680
1681 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1682                                struct snd_pcm_hw_rule *rule)
1683 {
1684         struct snd_interval t;
1685         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1686                      hw_param_interval_c(params, rule->deps[1]), &t);
1687         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1688 }
1689
1690 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1691                                    struct snd_pcm_hw_rule *rule)
1692 {
1693         struct snd_interval t;
1694         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1695                          hw_param_interval_c(params, rule->deps[1]),
1696                          (unsigned long) rule->private, &t);
1697         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1698 }
1699
1700 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1701                                    struct snd_pcm_hw_rule *rule)
1702 {
1703         struct snd_interval t;
1704         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1705                          (unsigned long) rule->private,
1706                          hw_param_interval_c(params, rule->deps[1]), &t);
1707         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1708 }
1709
1710 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1711                                   struct snd_pcm_hw_rule *rule)
1712 {
1713         unsigned int k;
1714         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1715         struct snd_mask m;
1716         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1717         snd_mask_any(&m);
1718         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1719                 int bits;
1720                 if (! snd_mask_test(mask, k))
1721                         continue;
1722                 bits = snd_pcm_format_physical_width(k);
1723                 if (bits <= 0)
1724                         continue; /* ignore invalid formats */
1725                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1726                         snd_mask_reset(&m, k);
1727         }
1728         return snd_mask_refine(mask, &m);
1729 }
1730
1731 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1732                                        struct snd_pcm_hw_rule *rule)
1733 {
1734         struct snd_interval t;
1735         unsigned int k;
1736         t.min = UINT_MAX;
1737         t.max = 0;
1738         t.openmin = 0;
1739         t.openmax = 0;
1740         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1741                 int bits;
1742                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1743                         continue;
1744                 bits = snd_pcm_format_physical_width(k);
1745                 if (bits <= 0)
1746                         continue; /* ignore invalid formats */
1747                 if (t.min > (unsigned)bits)
1748                         t.min = bits;
1749                 if (t.max < (unsigned)bits)
1750                         t.max = bits;
1751         }
1752         t.integer = 1;
1753         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1754 }
1755
1756 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1757 #error "Change this table"
1758 #endif
1759
1760 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1761                                  48000, 64000, 88200, 96000, 176400, 192000 };
1762
1763 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1764         .count = ARRAY_SIZE(rates),
1765         .list = rates,
1766 };
1767
1768 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1769                                 struct snd_pcm_hw_rule *rule)
1770 {
1771         struct snd_pcm_hardware *hw = rule->private;
1772         return snd_interval_list(hw_param_interval(params, rule->var),
1773                                  snd_pcm_known_rates.count,
1774                                  snd_pcm_known_rates.list, hw->rates);
1775 }
1776
1777 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1778                                             struct snd_pcm_hw_rule *rule)
1779 {
1780         struct snd_interval t;
1781         struct snd_pcm_substream *substream = rule->private;
1782         t.min = 0;
1783         t.max = substream->buffer_bytes_max;
1784         t.openmin = 0;
1785         t.openmax = 0;
1786         t.integer = 1;
1787         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1788 }
1789
1790 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1791 {
1792         struct snd_pcm_runtime *runtime = substream->runtime;
1793         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1794         int k, err;
1795
1796         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1797                 snd_mask_any(constrs_mask(constrs, k));
1798         }
1799
1800         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1801                 snd_interval_any(constrs_interval(constrs, k));
1802         }
1803
1804         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1805         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1806         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1807         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1808         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1809
1810         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1811                                    snd_pcm_hw_rule_format, NULL,
1812                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1813         if (err < 0)
1814                 return err;
1815         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1816                                   snd_pcm_hw_rule_sample_bits, NULL,
1817                                   SNDRV_PCM_HW_PARAM_FORMAT,
1818                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1819         if (err < 0)
1820                 return err;
1821         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1822                                   snd_pcm_hw_rule_div, NULL,
1823                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1824         if (err < 0)
1825                 return err;
1826         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1827                                   snd_pcm_hw_rule_mul, NULL,
1828                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1829         if (err < 0)
1830                 return err;
1831         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1832                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1833                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1834         if (err < 0)
1835                 return err;
1836         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1837                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1838                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1842                                   snd_pcm_hw_rule_div, NULL,
1843                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1844         if (err < 0)
1845                 return err;
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1847                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1848                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1852                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1853                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1857                                   snd_pcm_hw_rule_div, NULL,
1858                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1862                                   snd_pcm_hw_rule_div, NULL,
1863                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1867                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1868                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1869         if (err < 0)
1870                 return err;
1871         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1872                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1873                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1877                                   snd_pcm_hw_rule_mul, NULL,
1878                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1879         if (err < 0)
1880                 return err;
1881         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1882                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1883                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1884         if (err < 0)
1885                 return err;
1886         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1887                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1888                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1889         if (err < 0)
1890                 return err;
1891         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1892                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1893                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1894         if (err < 0)
1895                 return err;
1896         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1897                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1898                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1899         if (err < 0)
1900                 return err;
1901         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1902                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1903                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1904         if (err < 0)
1905                 return err;
1906         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1907                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1908                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1909         if (err < 0)
1910                 return err;
1911         return 0;
1912 }
1913
1914 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1915 {
1916         struct snd_pcm_runtime *runtime = substream->runtime;
1917         struct snd_pcm_hardware *hw = &runtime->hw;
1918         int err;
1919         unsigned int mask = 0;
1920
1921         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1922                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1923         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1924                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1925         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1926                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1927                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1928                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1929                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1930                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1931                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1932         }
1933         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1934         if (err < 0)
1935                 return err;
1936
1937         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1938         if (err < 0)
1939                 return err;
1940
1941         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1942         if (err < 0)
1943                 return err;
1944
1945         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1946                                            hw->channels_min, hw->channels_max);
1947         if (err < 0)
1948                 return err;
1949
1950         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1951                                            hw->rate_min, hw->rate_max);
1952         if (err < 0)
1953                 return err;
1954
1955         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1956                                            hw->period_bytes_min, hw->period_bytes_max);
1957         if (err < 0)
1958                 return err;
1959
1960         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1961                                            hw->periods_min, hw->periods_max);
1962         if (err < 0)
1963                 return err;
1964
1965         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1966                                            hw->period_bytes_min, hw->buffer_bytes_max);
1967         if (err < 0)
1968                 return err;
1969
1970         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1971                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1972                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1973         if (err < 0)
1974                 return err;
1975
1976         /* FIXME: remove */
1977         if (runtime->dma_bytes) {
1978                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1979                 if (err < 0)
1980                         return -EINVAL;
1981         }
1982
1983         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1984                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1985                                           snd_pcm_hw_rule_rate, hw,
1986                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1987                 if (err < 0)
1988                         return err;
1989         }
1990
1991         /* FIXME: this belong to lowlevel */
1992         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1993
1994         return 0;
1995 }
1996
1997 static void pcm_release_private(struct snd_pcm_substream *substream)
1998 {
1999         snd_pcm_unlink(substream);
2000 }
2001
2002 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2003 {
2004         substream->ref_count--;
2005         if (substream->ref_count > 0)
2006                 return;
2007
2008         snd_pcm_drop(substream);
2009         if (substream->hw_opened) {
2010                 if (substream->ops->hw_free != NULL)
2011                         substream->ops->hw_free(substream);
2012                 substream->ops->close(substream);
2013                 substream->hw_opened = 0;
2014         }
2015         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2016                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2017         if (substream->pcm_release) {
2018                 substream->pcm_release(substream);
2019                 substream->pcm_release = NULL;
2020         }
2021         snd_pcm_detach_substream(substream);
2022 }
2023
2024 EXPORT_SYMBOL(snd_pcm_release_substream);
2025
2026 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2027                            struct file *file,
2028                            struct snd_pcm_substream **rsubstream)
2029 {
2030         struct snd_pcm_substream *substream;
2031         int err;
2032
2033         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2034         if (err < 0)
2035                 return err;
2036         if (substream->ref_count > 1) {
2037                 *rsubstream = substream;
2038                 return 0;
2039         }
2040
2041         err = snd_pcm_hw_constraints_init(substream);
2042         if (err < 0) {
2043                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2044                 goto error;
2045         }
2046
2047         if ((err = substream->ops->open(substream)) < 0)
2048                 goto error;
2049
2050         substream->hw_opened = 1;
2051
2052         err = snd_pcm_hw_constraints_complete(substream);
2053         if (err < 0) {
2054                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2055                 goto error;
2056         }
2057
2058         *rsubstream = substream;
2059         return 0;
2060
2061  error:
2062         snd_pcm_release_substream(substream);
2063         return err;
2064 }
2065
2066 EXPORT_SYMBOL(snd_pcm_open_substream);
2067
2068 static int snd_pcm_open_file(struct file *file,
2069                              struct snd_pcm *pcm,
2070                              int stream,
2071                              struct snd_pcm_file **rpcm_file)
2072 {
2073         struct snd_pcm_file *pcm_file;
2074         struct snd_pcm_substream *substream;
2075         int err;
2076
2077         if (rpcm_file)
2078                 *rpcm_file = NULL;
2079
2080         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2081         if (err < 0)
2082                 return err;
2083
2084         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2085         if (pcm_file == NULL) {
2086                 snd_pcm_release_substream(substream);
2087                 return -ENOMEM;
2088         }
2089         pcm_file->substream = substream;
2090         if (substream->ref_count == 1) {
2091                 substream->file = pcm_file;
2092                 substream->pcm_release = pcm_release_private;
2093         }
2094         file->private_data = pcm_file;
2095         if (rpcm_file)
2096                 *rpcm_file = pcm_file;
2097         return 0;
2098 }
2099
2100 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2101 {
2102         struct snd_pcm *pcm;
2103         int err = nonseekable_open(inode, file);
2104         if (err < 0)
2105                 return err;
2106         pcm = snd_lookup_minor_data(iminor(inode),
2107                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2108         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2109         snd_card_unref(pcm->card);
2110         return err;
2111 }
2112
2113 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2114 {
2115         struct snd_pcm *pcm;
2116         int err = nonseekable_open(inode, file);
2117         if (err < 0)
2118                 return err;
2119         pcm = snd_lookup_minor_data(iminor(inode),
2120                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2121         err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2122         snd_card_unref(pcm->card);
2123         return err;
2124 }
2125
2126 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2127 {
2128         int err;
2129         struct snd_pcm_file *pcm_file;
2130         wait_queue_t wait;
2131
2132         if (pcm == NULL) {
2133                 err = -ENODEV;
2134                 goto __error1;
2135         }
2136         err = snd_card_file_add(pcm->card, file);
2137         if (err < 0)
2138                 goto __error1;
2139         if (!try_module_get(pcm->card->module)) {
2140                 err = -EFAULT;
2141                 goto __error2;
2142         }
2143         init_waitqueue_entry(&wait, current);
2144         add_wait_queue(&pcm->open_wait, &wait);
2145         mutex_lock(&pcm->open_mutex);
2146         while (1) {
2147                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2148                 if (err >= 0)
2149                         break;
2150                 if (err == -EAGAIN) {
2151                         if (file->f_flags & O_NONBLOCK) {
2152                                 err = -EBUSY;
2153                                 break;
2154                         }
2155                 } else
2156                         break;
2157                 set_current_state(TASK_INTERRUPTIBLE);
2158                 mutex_unlock(&pcm->open_mutex);
2159                 schedule();
2160                 mutex_lock(&pcm->open_mutex);
2161                 if (signal_pending(current)) {
2162                         err = -ERESTARTSYS;
2163                         break;
2164                 }
2165         }
2166         remove_wait_queue(&pcm->open_wait, &wait);
2167         mutex_unlock(&pcm->open_mutex);
2168         if (err < 0)
2169                 goto __error;
2170         return err;
2171
2172       __error:
2173         module_put(pcm->card->module);
2174       __error2:
2175         snd_card_file_remove(pcm->card, file);
2176       __error1:
2177         return err;
2178 }
2179
2180 static int snd_pcm_release(struct inode *inode, struct file *file)
2181 {
2182         struct snd_pcm *pcm;
2183         struct snd_pcm_substream *substream;
2184         struct snd_pcm_file *pcm_file;
2185
2186         pcm_file = file->private_data;
2187         substream = pcm_file->substream;
2188         if (snd_BUG_ON(!substream))
2189                 return -ENXIO;
2190         pcm = substream->pcm;
2191         mutex_lock(&pcm->open_mutex);
2192         snd_pcm_release_substream(substream);
2193         kfree(pcm_file);
2194         mutex_unlock(&pcm->open_mutex);
2195         wake_up(&pcm->open_wait);
2196         module_put(pcm->card->module);
2197         snd_card_file_remove(pcm->card, file);
2198         return 0;
2199 }
2200
2201 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2202                                                  snd_pcm_uframes_t frames)
2203 {
2204         struct snd_pcm_runtime *runtime = substream->runtime;
2205         snd_pcm_sframes_t appl_ptr;
2206         snd_pcm_sframes_t ret;
2207         snd_pcm_sframes_t hw_avail;
2208
2209         if (frames == 0)
2210                 return 0;
2211
2212         snd_pcm_stream_lock_irq(substream);
2213         switch (runtime->status->state) {
2214         case SNDRV_PCM_STATE_PREPARED:
2215                 break;
2216         case SNDRV_PCM_STATE_DRAINING:
2217         case SNDRV_PCM_STATE_RUNNING:
2218                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2219                         break;
2220                 /* Fall through */
2221         case SNDRV_PCM_STATE_XRUN:
2222                 ret = -EPIPE;
2223                 goto __end;
2224         case SNDRV_PCM_STATE_SUSPENDED:
2225                 ret = -ESTRPIPE;
2226                 goto __end;
2227         default:
2228                 ret = -EBADFD;
2229                 goto __end;
2230         }
2231
2232         hw_avail = snd_pcm_playback_hw_avail(runtime);
2233         if (hw_avail <= 0) {
2234                 ret = 0;
2235                 goto __end;
2236         }
2237         if (frames > (snd_pcm_uframes_t)hw_avail)
2238                 frames = hw_avail;
2239         appl_ptr = runtime->control->appl_ptr - frames;
2240         if (appl_ptr < 0)
2241                 appl_ptr += runtime->boundary;
2242         runtime->control->appl_ptr = appl_ptr;
2243         ret = frames;
2244  __end:
2245         snd_pcm_stream_unlock_irq(substream);
2246         return ret;
2247 }
2248
2249 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2250                                                 snd_pcm_uframes_t frames)
2251 {
2252         struct snd_pcm_runtime *runtime = substream->runtime;
2253         snd_pcm_sframes_t appl_ptr;
2254         snd_pcm_sframes_t ret;
2255         snd_pcm_sframes_t hw_avail;
2256
2257         if (frames == 0)
2258                 return 0;
2259
2260         snd_pcm_stream_lock_irq(substream);
2261         switch (runtime->status->state) {
2262         case SNDRV_PCM_STATE_PREPARED:
2263         case SNDRV_PCM_STATE_DRAINING:
2264                 break;
2265         case SNDRV_PCM_STATE_RUNNING:
2266                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2267                         break;
2268                 /* Fall through */
2269         case SNDRV_PCM_STATE_XRUN:
2270                 ret = -EPIPE;
2271                 goto __end;
2272         case SNDRV_PCM_STATE_SUSPENDED:
2273                 ret = -ESTRPIPE;
2274                 goto __end;
2275         default:
2276                 ret = -EBADFD;
2277                 goto __end;
2278         }
2279
2280         hw_avail = snd_pcm_capture_hw_avail(runtime);
2281         if (hw_avail <= 0) {
2282                 ret = 0;
2283                 goto __end;
2284         }
2285         if (frames > (snd_pcm_uframes_t)hw_avail)
2286                 frames = hw_avail;
2287         appl_ptr = runtime->control->appl_ptr - frames;
2288         if (appl_ptr < 0)
2289                 appl_ptr += runtime->boundary;
2290         runtime->control->appl_ptr = appl_ptr;
2291         ret = frames;
2292  __end:
2293         snd_pcm_stream_unlock_irq(substream);
2294         return ret;
2295 }
2296
2297 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2298                                                   snd_pcm_uframes_t frames)
2299 {
2300         struct snd_pcm_runtime *runtime = substream->runtime;
2301         snd_pcm_sframes_t appl_ptr;
2302         snd_pcm_sframes_t ret;
2303         snd_pcm_sframes_t avail;
2304
2305         if (frames == 0)
2306                 return 0;
2307
2308         snd_pcm_stream_lock_irq(substream);
2309         switch (runtime->status->state) {
2310         case SNDRV_PCM_STATE_PREPARED:
2311         case SNDRV_PCM_STATE_PAUSED:
2312                 break;
2313         case SNDRV_PCM_STATE_DRAINING:
2314         case SNDRV_PCM_STATE_RUNNING:
2315                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2316                         break;
2317                 /* Fall through */
2318         case SNDRV_PCM_STATE_XRUN:
2319                 ret = -EPIPE;
2320                 goto __end;
2321         case SNDRV_PCM_STATE_SUSPENDED:
2322                 ret = -ESTRPIPE;
2323                 goto __end;
2324         default:
2325                 ret = -EBADFD;
2326                 goto __end;
2327         }
2328
2329         avail = snd_pcm_playback_avail(runtime);
2330         if (avail <= 0) {
2331                 ret = 0;
2332                 goto __end;
2333         }
2334         if (frames > (snd_pcm_uframes_t)avail)
2335                 frames = avail;
2336         appl_ptr = runtime->control->appl_ptr + frames;
2337         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2338                 appl_ptr -= runtime->boundary;
2339         runtime->control->appl_ptr = appl_ptr;
2340         ret = frames;
2341  __end:
2342         snd_pcm_stream_unlock_irq(substream);
2343         return ret;
2344 }
2345
2346 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2347                                                  snd_pcm_uframes_t frames)
2348 {
2349         struct snd_pcm_runtime *runtime = substream->runtime;
2350         snd_pcm_sframes_t appl_ptr;
2351         snd_pcm_sframes_t ret;
2352         snd_pcm_sframes_t avail;
2353
2354         if (frames == 0)
2355                 return 0;
2356
2357         snd_pcm_stream_lock_irq(substream);
2358         switch (runtime->status->state) {
2359         case SNDRV_PCM_STATE_PREPARED:
2360         case SNDRV_PCM_STATE_DRAINING:
2361         case SNDRV_PCM_STATE_PAUSED:
2362                 break;
2363         case SNDRV_PCM_STATE_RUNNING:
2364                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2365                         break;
2366                 /* Fall through */
2367         case SNDRV_PCM_STATE_XRUN:
2368                 ret = -EPIPE;
2369                 goto __end;
2370         case SNDRV_PCM_STATE_SUSPENDED:
2371                 ret = -ESTRPIPE;
2372                 goto __end;
2373         default:
2374                 ret = -EBADFD;
2375                 goto __end;
2376         }
2377
2378         avail = snd_pcm_capture_avail(runtime);
2379         if (avail <= 0) {
2380                 ret = 0;
2381                 goto __end;
2382         }
2383         if (frames > (snd_pcm_uframes_t)avail)
2384                 frames = avail;
2385         appl_ptr = runtime->control->appl_ptr + frames;
2386         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2387                 appl_ptr -= runtime->boundary;
2388         runtime->control->appl_ptr = appl_ptr;
2389         ret = frames;
2390  __end:
2391         snd_pcm_stream_unlock_irq(substream);
2392         return ret;
2393 }
2394
2395 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2396 {
2397         struct snd_pcm_runtime *runtime = substream->runtime;
2398         int err;
2399
2400         snd_pcm_stream_lock_irq(substream);
2401         switch (runtime->status->state) {
2402         case SNDRV_PCM_STATE_DRAINING:
2403                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2404                         goto __badfd;
2405         case SNDRV_PCM_STATE_RUNNING:
2406                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2407                         break;
2408                 /* Fall through */
2409         case SNDRV_PCM_STATE_PREPARED:
2410         case SNDRV_PCM_STATE_SUSPENDED:
2411                 err = 0;
2412                 break;
2413         case SNDRV_PCM_STATE_XRUN:
2414                 err = -EPIPE;
2415                 break;
2416         default:
2417               __badfd:
2418                 err = -EBADFD;
2419                 break;
2420         }
2421         snd_pcm_stream_unlock_irq(substream);
2422         return err;
2423 }
2424
2425 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2426                          snd_pcm_sframes_t __user *res)
2427 {
2428         struct snd_pcm_runtime *runtime = substream->runtime;
2429         int err;
2430         snd_pcm_sframes_t n = 0;
2431
2432         snd_pcm_stream_lock_irq(substream);
2433         switch (runtime->status->state) {
2434         case SNDRV_PCM_STATE_DRAINING:
2435                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2436                         goto __badfd;
2437         case SNDRV_PCM_STATE_RUNNING:
2438                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2439                         break;
2440                 /* Fall through */
2441         case SNDRV_PCM_STATE_PREPARED:
2442         case SNDRV_PCM_STATE_SUSPENDED:
2443                 err = 0;
2444                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2445                         n = snd_pcm_playback_hw_avail(runtime);
2446                 else
2447                         n = snd_pcm_capture_avail(runtime);
2448                 n += runtime->delay;
2449                 break;
2450         case SNDRV_PCM_STATE_XRUN:
2451                 err = -EPIPE;
2452                 break;
2453         default:
2454               __badfd:
2455                 err = -EBADFD;
2456                 break;
2457         }
2458         snd_pcm_stream_unlock_irq(substream);
2459         if (!err)
2460                 if (put_user(n, res))
2461                         err = -EFAULT;
2462         return err;
2463 }
2464
2465 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2466                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2467 {
2468         struct snd_pcm_runtime *runtime = substream->runtime;
2469         struct snd_pcm_sync_ptr sync_ptr;
2470         volatile struct snd_pcm_mmap_status *status;
2471         volatile struct snd_pcm_mmap_control *control;
2472         int err;
2473
2474         memset(&sync_ptr, 0, sizeof(sync_ptr));
2475         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2476                 return -EFAULT;
2477         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2478                 return -EFAULT;
2479         status = runtime->status;
2480         control = runtime->control;
2481         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2482                 err = snd_pcm_hwsync(substream);
2483                 if (err < 0)
2484                         return err;
2485         }
2486         snd_pcm_stream_lock_irq(substream);
2487         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2488                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2489         else
2490                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2491         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2492                 control->avail_min = sync_ptr.c.control.avail_min;
2493         else
2494                 sync_ptr.c.control.avail_min = control->avail_min;
2495         sync_ptr.s.status.state = status->state;
2496         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2497         sync_ptr.s.status.tstamp = status->tstamp;
2498         sync_ptr.s.status.suspended_state = status->suspended_state;
2499         snd_pcm_stream_unlock_irq(substream);
2500         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2501                 return -EFAULT;
2502         return 0;
2503 }
2504
2505 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2506 {
2507         struct snd_pcm_runtime *runtime = substream->runtime;
2508         int arg;
2509
2510         if (get_user(arg, _arg))
2511                 return -EFAULT;
2512         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2513                 return -EINVAL;
2514         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2515         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2516                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2517         return 0;
2518 }
2519
2520 static int snd_pcm_common_ioctl1(struct file *file,
2521                                  struct snd_pcm_substream *substream,
2522                                  unsigned int cmd, void __user *arg)
2523 {
2524         switch (cmd) {
2525         case SNDRV_PCM_IOCTL_PVERSION:
2526                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2527         case SNDRV_PCM_IOCTL_INFO:
2528                 return snd_pcm_info_user(substream, arg);
2529         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2530                 return 0;
2531         case SNDRV_PCM_IOCTL_TTSTAMP:
2532                 return snd_pcm_tstamp(substream, arg);
2533         case SNDRV_PCM_IOCTL_HW_REFINE:
2534                 return snd_pcm_hw_refine_user(substream, arg);
2535         case SNDRV_PCM_IOCTL_HW_PARAMS:
2536                 return snd_pcm_hw_params_user(substream, arg);
2537         case SNDRV_PCM_IOCTL_HW_FREE:
2538                 return snd_pcm_hw_free(substream);
2539         case SNDRV_PCM_IOCTL_SW_PARAMS:
2540                 return snd_pcm_sw_params_user(substream, arg);
2541         case SNDRV_PCM_IOCTL_STATUS:
2542                 return snd_pcm_status_user(substream, arg);
2543         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2544                 return snd_pcm_channel_info_user(substream, arg);
2545         case SNDRV_PCM_IOCTL_PREPARE:
2546                 return snd_pcm_prepare(substream, file);
2547         case SNDRV_PCM_IOCTL_RESET:
2548                 return snd_pcm_reset(substream);
2549         case SNDRV_PCM_IOCTL_START:
2550                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2551         case SNDRV_PCM_IOCTL_LINK:
2552                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2553         case SNDRV_PCM_IOCTL_UNLINK:
2554                 return snd_pcm_unlink(substream);
2555         case SNDRV_PCM_IOCTL_RESUME:
2556                 return snd_pcm_resume(substream);
2557         case SNDRV_PCM_IOCTL_XRUN:
2558                 return snd_pcm_xrun(substream);
2559         case SNDRV_PCM_IOCTL_HWSYNC:
2560                 return snd_pcm_hwsync(substream);
2561         case SNDRV_PCM_IOCTL_DELAY:
2562                 return snd_pcm_delay(substream, arg);
2563         case SNDRV_PCM_IOCTL_SYNC_PTR:
2564                 return snd_pcm_sync_ptr(substream, arg);
2565 #ifdef CONFIG_SND_SUPPORT_OLD_API
2566         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2567                 return snd_pcm_hw_refine_old_user(substream, arg);
2568         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2569                 return snd_pcm_hw_params_old_user(substream, arg);
2570 #endif
2571         case SNDRV_PCM_IOCTL_DRAIN:
2572                 return snd_pcm_drain(substream, file);
2573         case SNDRV_PCM_IOCTL_DROP:
2574                 return snd_pcm_drop(substream);
2575         case SNDRV_PCM_IOCTL_PAUSE:
2576         {
2577                 int res;
2578                 snd_pcm_stream_lock_irq(substream);
2579                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2580                 snd_pcm_stream_unlock_irq(substream);
2581                 return res;
2582         }
2583         }
2584         snd_printd("unknown ioctl = 0x%x\n", cmd);
2585         return -ENOTTY;
2586 }
2587
2588 static int snd_pcm_playback_ioctl1(struct file *file,
2589                                    struct snd_pcm_substream *substream,
2590                                    unsigned int cmd, void __user *arg)
2591 {
2592         if (snd_BUG_ON(!substream))
2593                 return -ENXIO;
2594         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2595                 return -EINVAL;
2596         switch (cmd) {
2597         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2598         {
2599                 struct snd_xferi xferi;
2600                 struct snd_xferi __user *_xferi = arg;
2601                 struct snd_pcm_runtime *runtime = substream->runtime;
2602                 snd_pcm_sframes_t result;
2603                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2604                         return -EBADFD;
2605                 if (put_user(0, &_xferi->result))
2606                         return -EFAULT;
2607                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2608                         return -EFAULT;
2609                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2610                 __put_user(result, &_xferi->result);
2611                 return result < 0 ? result : 0;
2612         }
2613         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2614         {
2615                 struct snd_xfern xfern;
2616                 struct snd_xfern __user *_xfern = arg;
2617                 struct snd_pcm_runtime *runtime = substream->runtime;
2618                 void __user **bufs;
2619                 snd_pcm_sframes_t result;
2620                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2621                         return -EBADFD;
2622                 if (runtime->channels > 128)
2623                         return -EINVAL;
2624                 if (put_user(0, &_xfern->result))
2625                         return -EFAULT;
2626                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2627                         return -EFAULT;
2628
2629                 bufs = memdup_user(xfern.bufs,
2630                                    sizeof(void *) * runtime->channels);
2631                 if (IS_ERR(bufs))
2632                         return PTR_ERR(bufs);
2633                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2634                 kfree(bufs);
2635                 __put_user(result, &_xfern->result);
2636                 return result < 0 ? result : 0;
2637         }
2638         case SNDRV_PCM_IOCTL_REWIND:
2639         {
2640                 snd_pcm_uframes_t frames;
2641                 snd_pcm_uframes_t __user *_frames = arg;
2642                 snd_pcm_sframes_t result;
2643                 if (get_user(frames, _frames))
2644                         return -EFAULT;
2645                 if (put_user(0, _frames))
2646                         return -EFAULT;
2647                 result = snd_pcm_playback_rewind(substream, frames);
2648                 __put_user(result, _frames);
2649                 return result < 0 ? result : 0;
2650         }
2651         case SNDRV_PCM_IOCTL_FORWARD:
2652         {
2653                 snd_pcm_uframes_t frames;
2654                 snd_pcm_uframes_t __user *_frames = arg;
2655                 snd_pcm_sframes_t result;
2656                 if (get_user(frames, _frames))
2657                         return -EFAULT;
2658                 if (put_user(0, _frames))
2659                         return -EFAULT;
2660                 result = snd_pcm_playback_forward(substream, frames);
2661                 __put_user(result, _frames);
2662                 return result < 0 ? result : 0;
2663         }
2664         }
2665         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2666 }
2667
2668 static int snd_pcm_capture_ioctl1(struct file *file,
2669                                   struct snd_pcm_substream *substream,
2670                                   unsigned int cmd, void __user *arg)
2671 {
2672         if (snd_BUG_ON(!substream))
2673                 return -ENXIO;
2674         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2675                 return -EINVAL;
2676         switch (cmd) {
2677         case SNDRV_PCM_IOCTL_READI_FRAMES:
2678         {
2679                 struct snd_xferi xferi;
2680                 struct snd_xferi __user *_xferi = arg;
2681                 struct snd_pcm_runtime *runtime = substream->runtime;
2682                 snd_pcm_sframes_t result;
2683                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2684                         return -EBADFD;
2685                 if (put_user(0, &_xferi->result))
2686                         return -EFAULT;
2687                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2688                         return -EFAULT;
2689                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2690                 __put_user(result, &_xferi->result);
2691                 return result < 0 ? result : 0;
2692         }
2693         case SNDRV_PCM_IOCTL_READN_FRAMES:
2694         {
2695                 struct snd_xfern xfern;
2696                 struct snd_xfern __user *_xfern = arg;
2697                 struct snd_pcm_runtime *runtime = substream->runtime;
2698                 void *bufs;
2699                 snd_pcm_sframes_t result;
2700                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2701                         return -EBADFD;
2702                 if (runtime->channels > 128)
2703                         return -EINVAL;
2704                 if (put_user(0, &_xfern->result))
2705                         return -EFAULT;
2706                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2707                         return -EFAULT;
2708
2709                 bufs = memdup_user(xfern.bufs,
2710                                    sizeof(void *) * runtime->channels);
2711                 if (IS_ERR(bufs))
2712                         return PTR_ERR(bufs);
2713                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2714                 kfree(bufs);
2715                 __put_user(result, &_xfern->result);
2716                 return result < 0 ? result : 0;
2717         }
2718         case SNDRV_PCM_IOCTL_REWIND:
2719         {
2720                 snd_pcm_uframes_t frames;
2721                 snd_pcm_uframes_t __user *_frames = arg;
2722                 snd_pcm_sframes_t result;
2723                 if (get_user(frames, _frames))
2724                         return -EFAULT;
2725                 if (put_user(0, _frames))
2726                         return -EFAULT;
2727                 result = snd_pcm_capture_rewind(substream, frames);
2728                 __put_user(result, _frames);
2729                 return result < 0 ? result : 0;
2730         }
2731         case SNDRV_PCM_IOCTL_FORWARD:
2732         {
2733                 snd_pcm_uframes_t frames;
2734                 snd_pcm_uframes_t __user *_frames = arg;
2735                 snd_pcm_sframes_t result;
2736                 if (get_user(frames, _frames))
2737                         return -EFAULT;
2738                 if (put_user(0, _frames))
2739                         return -EFAULT;
2740                 result = snd_pcm_capture_forward(substream, frames);
2741                 __put_user(result, _frames);
2742                 return result < 0 ? result : 0;
2743         }
2744         }
2745         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2746 }
2747
2748 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2749                                    unsigned long arg)
2750 {
2751         struct snd_pcm_file *pcm_file;
2752
2753         pcm_file = file->private_data;
2754
2755         if (((cmd >> 8) & 0xff) != 'A')
2756                 return -ENOTTY;
2757
2758         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2759                                        (void __user *)arg);
2760 }
2761
2762 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2763                                   unsigned long arg)
2764 {
2765         struct snd_pcm_file *pcm_file;
2766
2767         pcm_file = file->private_data;
2768
2769         if (((cmd >> 8) & 0xff) != 'A')
2770                 return -ENOTTY;
2771
2772         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2773                                       (void __user *)arg);
2774 }
2775
2776 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2777                          unsigned int cmd, void *arg)
2778 {
2779         mm_segment_t fs;
2780         int result;
2781
2782         fs = snd_enter_user();
2783         switch (substream->stream) {
2784         case SNDRV_PCM_STREAM_PLAYBACK:
2785                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2786                                                  (void __user *)arg);
2787                 break;
2788         case SNDRV_PCM_STREAM_CAPTURE:
2789                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2790                                                 (void __user *)arg);
2791                 break;
2792         default:
2793                 result = -EINVAL;
2794                 break;
2795         }
2796         snd_leave_user(fs);
2797         return result;
2798 }
2799
2800 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2801
2802 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2803                             loff_t * offset)
2804 {
2805         struct snd_pcm_file *pcm_file;
2806         struct snd_pcm_substream *substream;
2807         struct snd_pcm_runtime *runtime;
2808         snd_pcm_sframes_t result;
2809
2810         pcm_file = file->private_data;
2811         substream = pcm_file->substream;
2812         if (PCM_RUNTIME_CHECK(substream))
2813                 return -ENXIO;
2814         runtime = substream->runtime;
2815         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2816                 return -EBADFD;
2817         if (!frame_aligned(runtime, count))
2818                 return -EINVAL;
2819         count = bytes_to_frames(runtime, count);
2820         result = snd_pcm_lib_read(substream, buf, count);
2821         if (result > 0)
2822                 result = frames_to_bytes(runtime, result);
2823         return result;
2824 }
2825
2826 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2827                              size_t count, loff_t * offset)
2828 {
2829         struct snd_pcm_file *pcm_file;
2830         struct snd_pcm_substream *substream;
2831         struct snd_pcm_runtime *runtime;
2832         snd_pcm_sframes_t result;
2833
2834         pcm_file = file->private_data;
2835         substream = pcm_file->substream;
2836         if (PCM_RUNTIME_CHECK(substream))
2837                 return -ENXIO;
2838         runtime = substream->runtime;
2839         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2840                 return -EBADFD;
2841         if (!frame_aligned(runtime, count))
2842                 return -EINVAL;
2843         count = bytes_to_frames(runtime, count);
2844         result = snd_pcm_lib_write(substream, buf, count);
2845         if (result > 0)
2846                 result = frames_to_bytes(runtime, result);
2847         return result;
2848 }
2849
2850 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2851                              unsigned long nr_segs, loff_t pos)
2852
2853 {
2854         struct snd_pcm_file *pcm_file;
2855         struct snd_pcm_substream *substream;
2856         struct snd_pcm_runtime *runtime;
2857         snd_pcm_sframes_t result;
2858         unsigned long i;
2859         void __user **bufs;
2860         snd_pcm_uframes_t frames;
2861
2862         pcm_file = iocb->ki_filp->private_data;
2863         substream = pcm_file->substream;
2864         if (PCM_RUNTIME_CHECK(substream))
2865                 return -ENXIO;
2866         runtime = substream->runtime;
2867         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2868                 return -EBADFD;
2869         if (nr_segs > 1024 || nr_segs != runtime->channels)
2870                 return -EINVAL;
2871         if (!frame_aligned(runtime, iov->iov_len))
2872                 return -EINVAL;
2873         frames = bytes_to_samples(runtime, iov->iov_len);
2874         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2875         if (bufs == NULL)
2876                 return -ENOMEM;
2877         for (i = 0; i < nr_segs; ++i)
2878                 bufs[i] = iov[i].iov_base;
2879         result = snd_pcm_lib_readv(substream, bufs, frames);
2880         if (result > 0)
2881                 result = frames_to_bytes(runtime, result);
2882         kfree(bufs);
2883         return result;
2884 }
2885
2886 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2887                               unsigned long nr_segs, loff_t pos)
2888 {
2889         struct snd_pcm_file *pcm_file;
2890         struct snd_pcm_substream *substream;
2891         struct snd_pcm_runtime *runtime;
2892         snd_pcm_sframes_t result;
2893         unsigned long i;
2894         void __user **bufs;
2895         snd_pcm_uframes_t frames;
2896
2897         pcm_file = iocb->ki_filp->private_data;
2898         substream = pcm_file->substream;
2899         if (PCM_RUNTIME_CHECK(substream))
2900                 return -ENXIO;
2901         runtime = substream->runtime;
2902         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2903                 return -EBADFD;
2904         if (nr_segs > 128 || nr_segs != runtime->channels ||
2905             !frame_aligned(runtime, iov->iov_len))
2906                 return -EINVAL;
2907         frames = bytes_to_samples(runtime, iov->iov_len);
2908         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2909         if (bufs == NULL)
2910                 return -ENOMEM;
2911         for (i = 0; i < nr_segs; ++i)
2912                 bufs[i] = iov[i].iov_base;
2913         result = snd_pcm_lib_writev(substream, bufs, frames);
2914         if (result > 0)
2915                 result = frames_to_bytes(runtime, result);
2916         kfree(bufs);
2917         return result;
2918 }
2919
2920 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2921 {
2922         struct snd_pcm_file *pcm_file;
2923         struct snd_pcm_substream *substream;
2924         struct snd_pcm_runtime *runtime;
2925         unsigned int mask;
2926         snd_pcm_uframes_t avail;
2927
2928         pcm_file = file->private_data;
2929
2930         substream = pcm_file->substream;
2931         if (PCM_RUNTIME_CHECK(substream))
2932                 return -ENXIO;
2933         runtime = substream->runtime;
2934
2935         poll_wait(file, &runtime->sleep, wait);
2936
2937         snd_pcm_stream_lock_irq(substream);
2938         avail = snd_pcm_playback_avail(runtime);
2939         switch (runtime->status->state) {
2940         case SNDRV_PCM_STATE_RUNNING:
2941         case SNDRV_PCM_STATE_PREPARED:
2942         case SNDRV_PCM_STATE_PAUSED:
2943                 if (avail >= runtime->control->avail_min) {
2944                         mask = POLLOUT | POLLWRNORM;
2945                         break;
2946                 }
2947                 /* Fall through */
2948         case SNDRV_PCM_STATE_DRAINING:
2949                 mask = 0;
2950                 break;
2951         default:
2952                 mask = POLLOUT | POLLWRNORM | POLLERR;
2953                 break;
2954         }
2955         snd_pcm_stream_unlock_irq(substream);
2956         return mask;
2957 }
2958
2959 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2960 {
2961         struct snd_pcm_file *pcm_file;
2962         struct snd_pcm_substream *substream;
2963         struct snd_pcm_runtime *runtime;
2964         unsigned int mask;
2965         snd_pcm_uframes_t avail;
2966
2967         pcm_file = file->private_data;
2968
2969         substream = pcm_file->substream;
2970         if (PCM_RUNTIME_CHECK(substream))
2971                 return -ENXIO;
2972         runtime = substream->runtime;
2973
2974         poll_wait(file, &runtime->sleep, wait);
2975
2976         snd_pcm_stream_lock_irq(substream);
2977         avail = snd_pcm_capture_avail(runtime);
2978         switch (runtime->status->state) {
2979         case SNDRV_PCM_STATE_RUNNING:
2980         case SNDRV_PCM_STATE_PREPARED:
2981         case SNDRV_PCM_STATE_PAUSED:
2982                 if (avail >= runtime->control->avail_min) {
2983                         mask = POLLIN | POLLRDNORM;
2984                         break;
2985                 }
2986                 mask = 0;
2987                 break;
2988         case SNDRV_PCM_STATE_DRAINING:
2989                 if (avail > 0) {
2990                         mask = POLLIN | POLLRDNORM;
2991                         break;
2992                 }
2993                 /* Fall through */
2994         default:
2995                 mask = POLLIN | POLLRDNORM | POLLERR;
2996                 break;
2997         }
2998         snd_pcm_stream_unlock_irq(substream);
2999         return mask;
3000 }
3001
3002 /*
3003  * mmap support
3004  */
3005
3006 /*
3007  * Only on coherent architectures, we can mmap the status and the control records
3008  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3009  */
3010 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3011 /*
3012  * mmap status record
3013  */
3014 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3015                                                 struct vm_fault *vmf)
3016 {
3017         struct snd_pcm_substream *substream = area->vm_private_data;
3018         struct snd_pcm_runtime *runtime;
3019
3020         if (substream == NULL)
3021                 return VM_FAULT_SIGBUS;
3022         runtime = substream->runtime;
3023         vmf->page = virt_to_page(runtime->status);
3024         get_page(vmf->page);
3025         return 0;
3026 }
3027
3028 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3029 {
3030         .fault =        snd_pcm_mmap_status_fault,
3031 };
3032
3033 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3034                                struct vm_area_struct *area)
3035 {
3036         long size;
3037         if (!(area->vm_flags & VM_READ))
3038                 return -EINVAL;
3039         size = area->vm_end - area->vm_start;
3040         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3041                 return -EINVAL;
3042         area->vm_ops = &snd_pcm_vm_ops_status;
3043         area->vm_private_data = substream;
3044         area->vm_flags |= VM_RESERVED;
3045         return 0;
3046 }
3047
3048 /*
3049  * mmap control record
3050  */
3051 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3052                                                 struct vm_fault *vmf)
3053 {
3054         struct snd_pcm_substream *substream = area->vm_private_data;
3055         struct snd_pcm_runtime *runtime;
3056
3057         if (substream == NULL)
3058                 return VM_FAULT_SIGBUS;
3059         runtime = substream->runtime;
3060         vmf->page = virt_to_page(runtime->control);
3061         get_page(vmf->page);
3062         return 0;
3063 }
3064
3065 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3066 {
3067         .fault =        snd_pcm_mmap_control_fault,
3068 };
3069
3070 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3071                                 struct vm_area_struct *area)
3072 {
3073         long size;
3074         if (!(area->vm_flags & VM_READ))
3075                 return -EINVAL;
3076         size = area->vm_end - area->vm_start;
3077         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3078                 return -EINVAL;
3079         area->vm_ops = &snd_pcm_vm_ops_control;
3080         area->vm_private_data = substream;
3081         area->vm_flags |= VM_RESERVED;
3082         return 0;
3083 }
3084 #else /* ! coherent mmap */
3085 /*
3086  * don't support mmap for status and control records.
3087  */
3088 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3089                                struct vm_area_struct *area)
3090 {
3091         return -ENXIO;
3092 }
3093 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3094                                 struct vm_area_struct *area)
3095 {
3096         return -ENXIO;
3097 }
3098 #endif /* coherent mmap */
3099
3100 static inline struct page *
3101 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3102 {
3103         void *vaddr = substream->runtime->dma_area + ofs;
3104 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3105         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3106                 return virt_to_page(CAC_ADDR(vaddr));
3107 #endif
3108 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3109         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3110                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3111                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3112                 /* assume dma_handle set via pfn_to_phys() in
3113                  * mm/dma-noncoherent.c
3114                  */
3115                 return pfn_to_page(addr >> PAGE_SHIFT);
3116         }
3117 #endif
3118         return virt_to_page(vaddr);
3119 }
3120
3121 /*
3122  * fault callback for mmapping a RAM page
3123  */
3124 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3125                                                 struct vm_fault *vmf)
3126 {
3127         struct snd_pcm_substream *substream = area->vm_private_data;
3128         struct snd_pcm_runtime *runtime;
3129         unsigned long offset;
3130         struct page * page;
3131         size_t dma_bytes;
3132
3133         if (substream == NULL)
3134                 return VM_FAULT_SIGBUS;
3135         runtime = substream->runtime;
3136         offset = vmf->pgoff << PAGE_SHIFT;
3137         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3138         if (offset > dma_bytes - PAGE_SIZE)
3139                 return VM_FAULT_SIGBUS;
3140         if (substream->ops->page)
3141                 page = substream->ops->page(substream, offset);
3142         else
3143                 page = snd_pcm_default_page_ops(substream, offset);
3144         if (!page)
3145                 return VM_FAULT_SIGBUS;
3146         get_page(page);
3147         vmf->page = page;
3148         return 0;
3149 }
3150
3151 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3152         .open =         snd_pcm_mmap_data_open,
3153         .close =        snd_pcm_mmap_data_close,
3154 };
3155
3156 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3157         .open =         snd_pcm_mmap_data_open,
3158         .close =        snd_pcm_mmap_data_close,
3159         .fault =        snd_pcm_mmap_data_fault,
3160 };
3161
3162 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3163 /* This should be defined / handled globally! */
3164 #ifdef CONFIG_ARM
3165 #define ARCH_HAS_DMA_MMAP_COHERENT
3166 #endif
3167 #endif
3168
3169 /*
3170  * mmap the DMA buffer on RAM
3171  */
3172 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3173                                 struct vm_area_struct *area)
3174 {
3175         area->vm_flags |= VM_RESERVED;
3176 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3177         if (!substream->ops->page &&
3178             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3179                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3180                                          area,
3181                                          substream->runtime->dma_area,
3182                                          substream->runtime->dma_addr,
3183                                          area->vm_end - area->vm_start);
3184 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3185         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3186             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3187                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3188 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3189         /* mmap with fault handler */
3190         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3191         return 0;
3192 }
3193
3194 /*
3195  * mmap the DMA buffer on I/O memory area
3196  */
3197 #if SNDRV_PCM_INFO_MMAP_IOMEM
3198 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3199                            struct vm_area_struct *area)
3200 {
3201         long size;
3202         unsigned long offset;
3203
3204         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3205         area->vm_flags |= VM_IO;
3206         size = area->vm_end - area->vm_start;
3207         offset = area->vm_pgoff << PAGE_SHIFT;
3208         if (io_remap_pfn_range(area, area->vm_start,
3209                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3210                                 size, area->vm_page_prot))
3211                 return -EAGAIN;
3212         return 0;
3213 }
3214
3215 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3216 #endif /* SNDRV_PCM_INFO_MMAP */
3217
3218 /*
3219  * mmap DMA buffer
3220  */
3221 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3222                       struct vm_area_struct *area)
3223 {
3224         struct snd_pcm_runtime *runtime;
3225         long size;
3226         unsigned long offset;
3227         size_t dma_bytes;
3228         int err;
3229
3230         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3231                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3232                         return -EINVAL;
3233         } else {
3234                 if (!(area->vm_flags & VM_READ))
3235                         return -EINVAL;
3236         }
3237         runtime = substream->runtime;
3238         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3239                 return -EBADFD;
3240         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3241                 return -ENXIO;
3242         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3243             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3244                 return -EINVAL;
3245         size = area->vm_end - area->vm_start;
3246         offset = area->vm_pgoff << PAGE_SHIFT;
3247         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3248         if ((size_t)size > dma_bytes)
3249                 return -EINVAL;
3250         if (offset > dma_bytes - size)
3251                 return -EINVAL;
3252
3253         area->vm_ops = &snd_pcm_vm_ops_data;
3254         area->vm_private_data = substream;
3255         if (substream->ops->mmap)
3256                 err = substream->ops->mmap(substream, area);
3257         else
3258                 err = snd_pcm_default_mmap(substream, area);
3259         if (!err)
3260                 atomic_inc(&substream->mmap_count);
3261         return err;
3262 }
3263
3264 EXPORT_SYMBOL(snd_pcm_mmap_data);
3265
3266 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3267 {
3268         struct snd_pcm_file * pcm_file;
3269         struct snd_pcm_substream *substream;
3270         unsigned long offset;
3271
3272         pcm_file = file->private_data;
3273         substream = pcm_file->substream;
3274         if (PCM_RUNTIME_CHECK(substream))
3275                 return -ENXIO;
3276
3277         offset = area->vm_pgoff << PAGE_SHIFT;
3278         switch (offset) {
3279         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3280                 if (pcm_file->no_compat_mmap)
3281                         return -ENXIO;
3282                 return snd_pcm_mmap_status(substream, file, area);
3283         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3284                 if (pcm_file->no_compat_mmap)
3285                         return -ENXIO;
3286                 return snd_pcm_mmap_control(substream, file, area);
3287         default:
3288                 return snd_pcm_mmap_data(substream, file, area);
3289         }
3290         return 0;
3291 }
3292
3293 static int snd_pcm_fasync(int fd, struct file * file, int on)
3294 {
3295         struct snd_pcm_file * pcm_file;
3296         struct snd_pcm_substream *substream;
3297         struct snd_pcm_runtime *runtime;
3298
3299         pcm_file = file->private_data;
3300         substream = pcm_file->substream;
3301         if (PCM_RUNTIME_CHECK(substream))
3302                 return -ENXIO;
3303         runtime = substream->runtime;
3304         return fasync_helper(fd, file, on, &runtime->fasync);
3305 }
3306
3307 /*
3308  * ioctl32 compat
3309  */
3310 #ifdef CONFIG_COMPAT
3311 #include "pcm_compat.c"
3312 #else
3313 #define snd_pcm_ioctl_compat    NULL
3314 #endif
3315
3316 /*
3317  *  To be removed helpers to keep binary compatibility
3318  */
3319
3320 #ifdef CONFIG_SND_SUPPORT_OLD_API
3321 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3322 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3323
3324 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3325                                                struct snd_pcm_hw_params_old *oparams)
3326 {
3327         unsigned int i;
3328
3329         memset(params, 0, sizeof(*params));
3330         params->flags = oparams->flags;
3331         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3332                 params->masks[i].bits[0] = oparams->masks[i];
3333         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3334         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3335         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3336         params->info = oparams->info;
3337         params->msbits = oparams->msbits;
3338         params->rate_num = oparams->rate_num;
3339         params->rate_den = oparams->rate_den;
3340         params->fifo_size = oparams->fifo_size;
3341 }
3342
3343 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3344                                              struct snd_pcm_hw_params *params)
3345 {
3346         unsigned int i;
3347
3348         memset(oparams, 0, sizeof(*oparams));
3349         oparams->flags = params->flags;
3350         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3351                 oparams->masks[i] = params->masks[i].bits[0];
3352         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3353         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3354         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3355         oparams->info = params->info;
3356         oparams->msbits = params->msbits;
3357         oparams->rate_num = params->rate_num;
3358         oparams->rate_den = params->rate_den;
3359         oparams->fifo_size = params->fifo_size;
3360 }
3361
3362 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3363                                       struct snd_pcm_hw_params_old __user * _oparams)
3364 {
3365         struct snd_pcm_hw_params *params;
3366         struct snd_pcm_hw_params_old *oparams = NULL;
3367         int err;
3368
3369         params = kmalloc(sizeof(*params), GFP_KERNEL);
3370         if (!params)
3371                 return -ENOMEM;
3372
3373         oparams = memdup_user(_oparams, sizeof(*oparams));
3374         if (IS_ERR(oparams)) {
3375                 err = PTR_ERR(oparams);
3376                 goto out;
3377         }
3378         snd_pcm_hw_convert_from_old_params(params, oparams);
3379         err = snd_pcm_hw_refine(substream, params);
3380         snd_pcm_hw_convert_to_old_params(oparams, params);
3381         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3382                 if (!err)
3383                         err = -EFAULT;
3384         }
3385
3386         kfree(oparams);
3387 out:
3388         kfree(params);
3389         return err;
3390 }
3391
3392 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3393                                       struct snd_pcm_hw_params_old __user * _oparams)
3394 {
3395         struct snd_pcm_hw_params *params;
3396         struct snd_pcm_hw_params_old *oparams = NULL;
3397         int err;
3398
3399         params = kmalloc(sizeof(*params), GFP_KERNEL);
3400         if (!params)
3401                 return -ENOMEM;
3402
3403         oparams = memdup_user(_oparams, sizeof(*oparams));
3404         if (IS_ERR(oparams)) {
3405                 err = PTR_ERR(oparams);
3406                 goto out;
3407         }
3408         snd_pcm_hw_convert_from_old_params(params, oparams);
3409         err = snd_pcm_hw_params(substream, params);
3410         snd_pcm_hw_convert_to_old_params(oparams, params);
3411         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3412                 if (!err)
3413                         err = -EFAULT;
3414         }
3415
3416         kfree(oparams);
3417 out:
3418         kfree(params);
3419         return err;
3420 }
3421 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3422
3423 #ifndef CONFIG_MMU
3424 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3425                                                unsigned long addr,
3426                                                unsigned long len,
3427                                                unsigned long pgoff,
3428                                                unsigned long flags)
3429 {
3430         struct snd_pcm_file *pcm_file = file->private_data;
3431         struct snd_pcm_substream *substream = pcm_file->substream;
3432         struct snd_pcm_runtime *runtime = substream->runtime;
3433         unsigned long offset = pgoff << PAGE_SHIFT;
3434
3435         switch (offset) {
3436         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3437                 return (unsigned long)runtime->status;
3438         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3439                 return (unsigned long)runtime->control;
3440         default:
3441                 return (unsigned long)runtime->dma_area + offset;
3442         }
3443 }
3444 #else
3445 # define snd_pcm_get_unmapped_area NULL
3446 #endif
3447
3448 /*
3449  *  Register section
3450  */
3451
3452 const struct file_operations snd_pcm_f_ops[2] = {
3453         {
3454                 .owner =                THIS_MODULE,
3455                 .write =                snd_pcm_write,
3456                 .aio_write =            snd_pcm_aio_write,
3457                 .open =                 snd_pcm_playback_open,
3458                 .release =              snd_pcm_release,
3459                 .llseek =               no_llseek,
3460                 .poll =                 snd_pcm_playback_poll,
3461                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3462                 .compat_ioctl =         snd_pcm_ioctl_compat,
3463                 .mmap =                 snd_pcm_mmap,
3464                 .fasync =               snd_pcm_fasync,
3465                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3466         },
3467         {
3468                 .owner =                THIS_MODULE,
3469                 .read =                 snd_pcm_read,
3470                 .aio_read =             snd_pcm_aio_read,
3471                 .open =                 snd_pcm_capture_open,
3472                 .release =              snd_pcm_release,
3473                 .llseek =               no_llseek,
3474                 .poll =                 snd_pcm_capture_poll,
3475                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3476                 .compat_ioctl =         snd_pcm_ioctl_compat,
3477                 .mmap =                 snd_pcm_mmap,
3478                 .fasync =               snd_pcm_fasync,
3479                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3480         }
3481 };