sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/module.h>
  24 #include <linux/file.h>
  25 #include <linux/slab.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos.h>
  28 #include <linux/uio.h>
  29 #include <linux/dma-mapping.h>
  30 #include <sound/core.h>
  31 #include <sound/control.h>
  32 #include <sound/info.h>
  33 #include <sound/pcm.h>
  34 #include <sound/pcm_params.h>
  35 #include <sound/timer.h>
  36 #include <sound/minors.h>
  37 #include <asm/io.h>
  38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  39 #include <dma-coherence.h>
  40 #endif
  41
  42 /*
  43  *  Compatibility
  44  */
  45
  46 struct snd_pcm_hw_params_old {
  47         unsigned int flags;
  48         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  49                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  50         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  51                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  52         unsigned int rmask;
  53         unsigned int cmask;
  54         unsigned int info;
  55         unsigned int msbits;
  56         unsigned int rate_num;
  57         unsigned int rate_den;
  58         snd_pcm_uframes_t fifo_size;
  59         unsigned char reserved[64];
  60 };
  61
  62 #ifdef CONFIG_SND_SUPPORT_OLD_API
  63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  65
  66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  69                                       struct snd_pcm_hw_params_old __user * _oparams);
  70 #endif
  71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  72
  73 /*
  74  *
  75  */
  76
  77 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  78 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  79
  80 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  81
  82 static inline mm_segment_t snd_enter_user(void)
  83 {
  84         mm_segment_t fs = get_fs();
  85         set_fs(get_ds());
  86         return fs;
  87 }
  88
  89 static inline void snd_leave_user(mm_segment_t fs)
  90 {
  91         set_fs(fs);
  92 }
  93
  94
  95
  96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  97 {
  98         struct snd_pcm_runtime *runtime;
  99         struct snd_pcm *pcm = substream->pcm;
 100         struct snd_pcm_str *pstr = substream->pstr;
 101
 102         memset(info, 0, sizeof(*info));
 103         info->card = pcm->card->number;
 104         info->device = pcm->device;
 105         info->stream = substream->stream;
 106         info->subdevice = substream->number;
 107         strlcpy(info->id, pcm->id, sizeof(info->id));
 108         strlcpy(info->name, pcm->name, sizeof(info->name));
 109         info->dev_class = pcm->dev_class;
 110         info->dev_subclass = pcm->dev_subclass;
 111         info->subdevices_count = pstr->substream_count;
 112         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 113         strlcpy(info->subname, substream->name, sizeof(info->subname));
 114         runtime = substream->runtime;
 115         /* AB: FIXME!!! This is definitely nonsense */
 116         if (runtime) {
 117                 info->sync = runtime->sync;
 118                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 119         }
 120         return 0;
 121 }
 122
 123 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 124                       struct snd_pcm_info __user * _info)
 125 {
 126         struct snd_pcm_info *info;
 127         int err;
 128
 129         info = kmalloc(sizeof(*info), GFP_KERNEL);
 130         if (! info)
 131                 return -ENOMEM;
 132         err = snd_pcm_info(substream, info);
 133         if (err >= 0) {
 134                 if (copy_to_user(_info, info, sizeof(*info)))
 135                         err = -EFAULT;
 136         }
 137         kfree(info);
 138         return err;
 139 }
 140
 141 #undef RULES_DEBUG
 142
 143 #ifdef RULES_DEBUG
 144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 145 static const char * const snd_pcm_hw_param_names[] = {
 146         HW_PARAM(ACCESS),
 147         HW_PARAM(FORMAT),
 148         HW_PARAM(SUBFORMAT),
 149         HW_PARAM(SAMPLE_BITS),
 150         HW_PARAM(FRAME_BITS),
 151         HW_PARAM(CHANNELS),
 152         HW_PARAM(RATE),
 153         HW_PARAM(PERIOD_TIME),
 154         HW_PARAM(PERIOD_SIZE),
 155         HW_PARAM(PERIOD_BYTES),
 156         HW_PARAM(PERIODS),
 157         HW_PARAM(BUFFER_TIME),
 158         HW_PARAM(BUFFER_SIZE),
 159         HW_PARAM(BUFFER_BYTES),
 160         HW_PARAM(TICK_TIME),
 161 };
 162 #endif
 163
 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 165                       struct snd_pcm_hw_params *params)
 166 {
 167         unsigned int k;
 168         struct snd_pcm_hardware *hw;
 169         struct snd_interval *i = NULL;
 170         struct snd_mask *m = NULL;
 171         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 172         unsigned int rstamps[constrs->rules_num];
 173         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 174         unsigned int stamp = 2;
 175         int changed, again;
 176
 177         params->info = 0;
 178         params->fifo_size = 0;
 179         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 180                 params->msbits = 0;
 181         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 182                 params->rate_num = 0;
 183                 params->rate_den = 0;
 184         }
 185
 186         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 187                 m = hw_param_mask(params, k);
 188                 if (snd_mask_empty(m))
 189                         return -EINVAL;
 190                 if (!(params->rmask & (1 << k)))
 191                         continue;
 192 #ifdef RULES_DEBUG
 193                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 194                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 197 #ifdef RULES_DEBUG
 198                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 199 #endif
 200                 if (changed)
 201                         params->cmask |= 1 << k;
 202                 if (changed < 0)
 203                         return changed;
 204         }
 205
 206         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 207                 i = hw_param_interval(params, k);
 208                 if (snd_interval_empty(i))
 209                         return -EINVAL;
 210                 if (!(params->rmask & (1 << k)))
 211                         continue;
 212 #ifdef RULES_DEBUG
 213                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 214                 if (i->empty)
 215                         printk("empty");
 216                 else
 217                         printk("%c%u %u%c",
 218                                i->openmin ? '(' : '[', i->min,
 219                                i->max, i->openmax ? ')' : ']');
 220                 printk(" -> ");
 221 #endif
 222                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 223 #ifdef RULES_DEBUG
 224                 if (i->empty)
 225                         printk("empty\n");
 226                 else
 227                         printk("%c%u %u%c\n",
 228                                i->openmin ? '(' : '[', i->min,
 229                                i->max, i->openmax ? ')' : ']');
 230 #endif
 231                 if (changed)
 232                         params->cmask |= 1 << k;
 233                 if (changed < 0)
 234                         return changed;
 235         }
 236
 237         for (k = 0; k < constrs->rules_num; k++)
 238                 rstamps[k] = 0;
 239         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 240                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 241         do {
 242                 again = 0;
 243                 for (k = 0; k < constrs->rules_num; k++) {
 244                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 245                         unsigned int d;
 246                         int doit = 0;
 247                         if (r->cond && !(r->cond & params->flags))
 248                                 continue;
 249                         for (d = 0; r->deps[d] >= 0; d++) {
 250                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 251                                         doit = 1;
 252                                         break;
 253                                 }
 254                         }
 255                         if (!doit)
 256                                 continue;
 257 #ifdef RULES_DEBUG
 258                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 259                         if (r->var >= 0) {
 260                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 261                                 if (hw_is_mask(r->var)) {
 262                                         m = hw_param_mask(params, r->var);
 263                                         printk("%x", *m->bits);
 264                                 } else {
 265                                         i = hw_param_interval(params, r->var);
 266                                         if (i->empty)
 267                                                 printk("empty");
 268                                         else
 269                                                 printk("%c%u %u%c",
 270                                                        i->openmin ? '(' : '[', i->min,
 271                                                        i->max, i->openmax ? ')' : ']');
 272                                 }
 273                         }
 274 #endif
 275                         changed = r->func(params, r);
 276 #ifdef RULES_DEBUG
 277                         if (r->var >= 0) {
 278                                 printk(" -> ");
 279                                 if (hw_is_mask(r->var))
 280                                         printk("%x", *m->bits);
 281                                 else {
 282                                         if (i->empty)
 283                                                 printk("empty");
 284                                         else
 285                                                 printk("%c%u %u%c",
 286                                                        i->openmin ? '(' : '[', i->min,
 287                                                        i->max, i->openmax ? ')' : ']');
 288                                 }
 289                         }
 290                         printk("\n");
 291 #endif
 292                         rstamps[k] = stamp;
 293                         if (changed && r->var >= 0) {
 294                                 params->cmask |= (1 << r->var);
 295                                 vstamps[r->var] = stamp;
 296                                 again = 1;
 297                         }
 298                         if (changed < 0)
 299                                 return changed;
 300                         stamp++;
 301                 }
 302         } while (again);
 303         if (!params->msbits) {
 304                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 305                 if (snd_interval_single(i))
 306                         params->msbits = snd_interval_value(i);
 307         }
 308
 309         if (!params->rate_den) {
 310                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 311                 if (snd_interval_single(i)) {
 312                         params->rate_num = snd_interval_value(i);
 313                         params->rate_den = 1;
 314                 }
 315         }
 316
 317         hw = &substream->runtime->hw;
 318         if (!params->info)
 319                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 320         if (!params->fifo_size) {
 321                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 322                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 323                 if (snd_mask_min(m) == snd_mask_max(m) &&
 324                     snd_interval_min(i) == snd_interval_max(i)) {
 325                         changed = substream->ops->ioctl(substream,
 326                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 327                         if (changed < 0)
 328                                 return changed;
 329                 }
 330         }
 331         params->rmask = 0;
 332         return 0;
 333 }
 334
 335 EXPORT_SYMBOL(snd_pcm_hw_refine);
 336
 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 338                                   struct snd_pcm_hw_params __user * _params)
 339 {
 340         struct snd_pcm_hw_params *params;
 341         int err;
 342
 343         params = memdup_user(_params, sizeof(*params));
 344         if (IS_ERR(params))
 345                 return PTR_ERR(params);
 346
 347         err = snd_pcm_hw_refine(substream, params);
 348         if (copy_to_user(_params, params, sizeof(*params))) {
 349                 if (!err)
 350                         err = -EFAULT;
 351         }
 352
 353         kfree(params);
 354         return err;
 355 }
 356
 357 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 358 {
 359         int usecs;
 360
 361         if (! runtime->rate)
 362                 return -1; /* invalid */
 363
 364         /* take 75% of period time as the deadline */
 365         usecs = (750000 / runtime->rate) * runtime->period_size;
 366         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 367                 runtime->rate;
 368
 369         return usecs;
 370 }
 371
 372 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 373                              struct snd_pcm_hw_params *params)
 374 {
 375         struct snd_pcm_runtime *runtime;
 376         int err, usecs;
 377         unsigned int bits;
 378         snd_pcm_uframes_t frames;
 379
 380         if (PCM_RUNTIME_CHECK(substream))
 381                 return -ENXIO;
 382         runtime = substream->runtime;
 383         snd_pcm_stream_lock_irq(substream);
 384         switch (runtime->status->state) {
 385         case SNDRV_PCM_STATE_OPEN:
 386         case SNDRV_PCM_STATE_SETUP:
 387         case SNDRV_PCM_STATE_PREPARED:
 388                 break;
 389         default:
 390                 snd_pcm_stream_unlock_irq(substream);
 391                 return -EBADFD;
 392         }
 393         snd_pcm_stream_unlock_irq(substream);
 394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 395         if (!substream->oss.oss)
 396 #endif
 397                 if (atomic_read(&substream->mmap_count))
 398                         return -EBADFD;
 399
 400         params->rmask = ~0U;
 401         err = snd_pcm_hw_refine(substream, params);
 402         if (err < 0)
 403                 goto _error;
 404
 405         err = snd_pcm_hw_params_choose(substream, params);
 406         if (err < 0)
 407                 goto _error;
 408
 409         if (substream->ops->hw_params != NULL) {
 410                 err = substream->ops->hw_params(substream, params);
 411                 if (err < 0)
 412                         goto _error;
 413         }
 414
 415         runtime->access = params_access(params);
 416         runtime->format = params_format(params);
 417         runtime->subformat = params_subformat(params);
 418         runtime->channels = params_channels(params);
 419         runtime->rate = params_rate(params);
 420         runtime->period_size = params_period_size(params);
 421         runtime->periods = params_periods(params);
 422         runtime->buffer_size = params_buffer_size(params);
 423         runtime->info = params->info;
 424         runtime->rate_num = params->rate_num;
 425         runtime->rate_den = params->rate_den;
 426         runtime->no_period_wakeup =
 427                         (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
 428                         (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);
 429
 430         bits = snd_pcm_format_physical_width(runtime->format);
 431         runtime->sample_bits = bits;
 432         bits *= runtime->channels;
 433         runtime->frame_bits = bits;
 434         frames = 1;
 435         while (bits % 8 != 0) {
 436                 bits *= 2;
 437                 frames *= 2;
 438         }
 439         runtime->byte_align = bits / 8;
 440         runtime->min_align = frames;
 441
 442         /* Default sw params */
 443         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 444         runtime->period_step = 1;
 445         runtime->control->avail_min = runtime->period_size;
 446         runtime->start_threshold = 1;
 447         runtime->stop_threshold = runtime->buffer_size;
 448         runtime->silence_threshold = 0;
 449         runtime->silence_size = 0;
 450         runtime->boundary = runtime->buffer_size;
 451         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 452                 runtime->boundary *= 2;
 453
 454         snd_pcm_timer_resolution_change(substream);
 455         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 456
 457         if (pm_qos_request_active(&substream->latency_pm_qos_req))
 458                 pm_qos_remove_request(&substream->latency_pm_qos_req);
 459         if ((usecs = period_to_usecs(runtime)) >= 0)
 460                 pm_qos_add_request(&substream->latency_pm_qos_req,
 461                                    PM_QOS_CPU_DMA_LATENCY, usecs);
 462         return 0;
 463  _error:
 464         /* hardware might be unusable from this time,
 465            so we force application to retry to set
 466            the correct hardware parameter settings */
 467         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 468         if (substream->ops->hw_free != NULL)
 469                 substream->ops->hw_free(substream);
 470         return err;
 471 }
 472
 473 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 474                                   struct snd_pcm_hw_params __user * _params)
 475 {
 476         struct snd_pcm_hw_params *params;
 477         int err;
 478
 479         params = memdup_user(_params, sizeof(*params));
 480         if (IS_ERR(params))
 481                 return PTR_ERR(params);
 482
 483         err = snd_pcm_hw_params(substream, params);
 484         if (copy_to_user(_params, params, sizeof(*params))) {
 485                 if (!err)
 486                         err = -EFAULT;
 487         }
 488
 489         kfree(params);
 490         return err;
 491 }
 492
 493 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 494 {
 495         struct snd_pcm_runtime *runtime;
 496         int result = 0;
 497
 498         if (PCM_RUNTIME_CHECK(substream))
 499                 return -ENXIO;
 500         runtime = substream->runtime;
 501         snd_pcm_stream_lock_irq(substream);
 502         switch (runtime->status->state) {
 503         case SNDRV_PCM_STATE_SETUP:
 504         case SNDRV_PCM_STATE_PREPARED:
 505                 break;
 506         default:
 507                 snd_pcm_stream_unlock_irq(substream);
 508                 return -EBADFD;
 509         }
 510         snd_pcm_stream_unlock_irq(substream);
 511         if (atomic_read(&substream->mmap_count))
 512                 return -EBADFD;
 513         if (substream->ops->hw_free)
 514                 result = substream->ops->hw_free(substream);
 515         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 516         pm_qos_remove_request(&substream->latency_pm_qos_req);
 517         return result;
 518 }
 519
 520 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 521                              struct snd_pcm_sw_params *params)
 522 {
 523         struct snd_pcm_runtime *runtime;
 524         int err;
 525
 526         if (PCM_RUNTIME_CHECK(substream))
 527                 return -ENXIO;
 528         runtime = substream->runtime;
 529         snd_pcm_stream_lock_irq(substream);
 530         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 531                 snd_pcm_stream_unlock_irq(substream);
 532                 return -EBADFD;
 533         }
 534         snd_pcm_stream_unlock_irq(substream);
 535
 536         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 537                 return -EINVAL;
 538         if (params->avail_min == 0)
 539                 return -EINVAL;
 540         if (params->silence_size >= runtime->boundary) {
 541                 if (params->silence_threshold != 0)
 542                         return -EINVAL;
 543         } else {
 544                 if (params->silence_size > params->silence_threshold)
 545                         return -EINVAL;
 546                 if (params->silence_threshold > runtime->buffer_size)
 547                         return -EINVAL;
 548         }
 549         err = 0;
 550         snd_pcm_stream_lock_irq(substream);
 551         runtime->tstamp_mode = params->tstamp_mode;
 552         runtime->period_step = params->period_step;
 553         runtime->control->avail_min = params->avail_min;
 554         runtime->start_threshold = params->start_threshold;
 555         runtime->stop_threshold = params->stop_threshold;
 556         runtime->silence_threshold = params->silence_threshold;
 557         runtime->silence_size = params->silence_size;
 558         params->boundary = runtime->boundary;
 559         if (snd_pcm_running(substream)) {
 560                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 561                     runtime->silence_size > 0)
 562                         snd_pcm_playback_silence(substream, ULONG_MAX);
 563                 err = snd_pcm_update_state(substream, runtime);
 564         }
 565         snd_pcm_stream_unlock_irq(substream);
 566         return err;
 567 }
 568
 569 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 570                                   struct snd_pcm_sw_params __user * _params)
 571 {
 572         struct snd_pcm_sw_params params;
 573         int err;
 574         if (copy_from_user(&params, _params, sizeof(params)))
 575                 return -EFAULT;
 576         err = snd_pcm_sw_params(substream, &params);
 577         if (copy_to_user(_params, &params, sizeof(params)))
 578                 return -EFAULT;
 579         return err;
 580 }
 581
 582 int snd_pcm_status(struct snd_pcm_substream *substream,
 583                    struct snd_pcm_status *status)
 584 {
 585         struct snd_pcm_runtime *runtime = substream->runtime;
 586
 587         snd_pcm_stream_lock_irq(substream);
 588         status->state = runtime->status->state;
 589         status->suspended_state = runtime->status->suspended_state;
 590         if (status->state == SNDRV_PCM_STATE_OPEN)
 591                 goto _end;
 592         status->trigger_tstamp = runtime->trigger_tstamp;
 593         if (snd_pcm_running(substream)) {
 594                 snd_pcm_update_hw_ptr(substream);
 595                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 596                         status->tstamp = runtime->status->tstamp;
 597                         status->audio_tstamp =
 598                                 runtime->status->audio_tstamp;
 599                         goto _tstamp_end;
 600                 }
 601         }
 602         snd_pcm_gettime(runtime, &status->tstamp);
 603  _tstamp_end:
 604         status->appl_ptr = runtime->control->appl_ptr;
 605         status->hw_ptr = runtime->status->hw_ptr;
 606         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 607                 status->avail = snd_pcm_playback_avail(runtime);
 608                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 609                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 610                         status->delay = runtime->buffer_size - status->avail;
 611                         status->delay += runtime->delay;
 612                 } else
 613                         status->delay = 0;
 614         } else {
 615                 status->avail = snd_pcm_capture_avail(runtime);
 616                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 617                         status->delay = status->avail + runtime->delay;
 618                 else
 619                         status->delay = 0;
 620         }
 621         status->avail_max = runtime->avail_max;
 622         status->overrange = runtime->overrange;
 623         runtime->avail_max = 0;
 624         runtime->overrange = 0;
 625  _end:
 626         snd_pcm_stream_unlock_irq(substream);
 627         return 0;
 628 }
 629
 630 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 631                                struct snd_pcm_status __user * _status)
 632 {
 633         struct snd_pcm_status status;
 634         int res;
 635
 636         memset(&status, 0, sizeof(status));
 637         res = snd_pcm_status(substream, &status);
 638         if (res < 0)
 639                 return res;
 640         if (copy_to_user(_status, &status, sizeof(status)))
 641                 return -EFAULT;
 642         return 0;
 643 }
 644
 645 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 646                                 struct snd_pcm_channel_info * info)
 647 {
 648         struct snd_pcm_runtime *runtime;
 649         unsigned int channel;
 650
 651         channel = info->channel;
 652         runtime = substream->runtime;
 653         snd_pcm_stream_lock_irq(substream);
 654         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 655                 snd_pcm_stream_unlock_irq(substream);
 656                 return -EBADFD;
 657         }
 658         snd_pcm_stream_unlock_irq(substream);
 659         if (channel >= runtime->channels)
 660                 return -EINVAL;
 661         memset(info, 0, sizeof(*info));
 662         info->channel = channel;
 663         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 664 }
 665
 666 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 667                                      struct snd_pcm_channel_info __user * _info)
 668 {
 669         struct snd_pcm_channel_info info;
 670         int res;
 671
 672         if (copy_from_user(&info, _info, sizeof(info)))
 673                 return -EFAULT;
 674         res = snd_pcm_channel_info(substream, &info);
 675         if (res < 0)
 676                 return res;
 677         if (copy_to_user(_info, &info, sizeof(info)))
 678                 return -EFAULT;
 679         return 0;
 680 }
 681
 682 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 683 {
 684         struct snd_pcm_runtime *runtime = substream->runtime;
 685         if (runtime->trigger_master == NULL)
 686                 return;
 687         if (runtime->trigger_master == substream) {
 688                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 689         } else {
 690                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 691                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 692         }
 693         runtime->trigger_master = NULL;
 694 }
 695
 696 struct action_ops {
 697         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 698         int (*do_action)(struct snd_pcm_substream *substream, int state);
 699         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 700         void (*post_action)(struct snd_pcm_substream *substream, int state);
 701 };
 702
 703 /*
 704  *  this functions is core for handling of linked stream
 705  *  Note: the stream state might be changed also on failure
 706  *  Note2: call with calling stream lock + link lock
 707  */
 708 static int snd_pcm_action_group(struct action_ops *ops,
 709                                 struct snd_pcm_substream *substream,
 710                                 int state, int do_lock)
 711 {
 712         struct snd_pcm_substream *s = NULL;
 713         struct snd_pcm_substream *s1;
 714         int res = 0;
 715
 716         snd_pcm_group_for_each_entry(s, substream) {
 717                 if (do_lock && s != substream)
 718                         spin_lock_nested(&s->self_group.lock,
 719                                          SINGLE_DEPTH_NESTING);
 720                 res = ops->pre_action(s, state);
 721                 if (res < 0)
 722                         goto _unlock;
 723         }
 724         snd_pcm_group_for_each_entry(s, substream) {
 725                 res = ops->do_action(s, state);
 726                 if (res < 0) {
 727                         if (ops->undo_action) {
 728                                 snd_pcm_group_for_each_entry(s1, substream) {
 729                                         if (s1 == s) /* failed stream */
 730                                                 break;
 731                                         ops->undo_action(s1, state);
 732                                 }
 733                         }
 734                         s = NULL; /* unlock all */
 735                         goto _unlock;
 736                 }
 737         }
 738         snd_pcm_group_for_each_entry(s, substream) {
 739                 ops->post_action(s, state);
 740         }
 741  _unlock:
 742         if (do_lock) {
 743                 /* unlock streams */
 744                 snd_pcm_group_for_each_entry(s1, substream) {
 745                         if (s1 != substream)
 746                                 spin_unlock(&s1->self_group.lock);
 747                         if (s1 == s)    /* end */
 748                                 break;
 749                 }
 750         }
 751         return res;
 752 }
 753
 754 /*
 755  *  Note: call with stream lock
 756  */
 757 static int snd_pcm_action_single(struct action_ops *ops,
 758                                  struct snd_pcm_substream *substream,
 759                                  int state)
 760 {
 761         int res;
 762
 763         res = ops->pre_action(substream, state);
 764         if (res < 0)
 765                 return res;
 766         res = ops->do_action(substream, state);
 767         if (res == 0)
 768                 ops->post_action(substream, state);
 769         else if (ops->undo_action)
 770                 ops->undo_action(substream, state);
 771         return res;
 772 }
 773
 774 /*
 775  *  Note: call with stream lock
 776  */
 777 static int snd_pcm_action(struct action_ops *ops,
 778                           struct snd_pcm_substream *substream,
 779                           int state)
 780 {
 781         int res;
 782
 783         if (snd_pcm_stream_linked(substream)) {
 784                 if (!spin_trylock(&substream->group->lock)) {
 785                         spin_unlock(&substream->self_group.lock);
 786                         spin_lock(&substream->group->lock);
 787                         spin_lock(&substream->self_group.lock);
 788                 }
 789                 res = snd_pcm_action_group(ops, substream, state, 1);
 790                 spin_unlock(&substream->group->lock);
 791         } else {
 792                 res = snd_pcm_action_single(ops, substream, state);
 793         }
 794         return res;
 795 }
 796
 797 /*
 798  *  Note: don't use any locks before
 799  */
 800 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 801                                    struct snd_pcm_substream *substream,
 802                                    int state)
 803 {
 804         int res;
 805
 806         read_lock_irq(&snd_pcm_link_rwlock);
 807         if (snd_pcm_stream_linked(substream)) {
 808                 spin_lock(&substream->group->lock);
 809                 spin_lock(&substream->self_group.lock);
 810                 res = snd_pcm_action_group(ops, substream, state, 1);
 811                 spin_unlock(&substream->self_group.lock);
 812                 spin_unlock(&substream->group->lock);
 813         } else {
 814                 spin_lock(&substream->self_group.lock);
 815                 res = snd_pcm_action_single(ops, substream, state);
 816                 spin_unlock(&substream->self_group.lock);
 817         }
 818         read_unlock_irq(&snd_pcm_link_rwlock);
 819         return res;
 820 }
 821
 822 /*
 823  */
 824 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 825                                     struct snd_pcm_substream *substream,
 826                                     int state)
 827 {
 828         int res;
 829
 830         down_read(&snd_pcm_link_rwsem);
 831         if (snd_pcm_stream_linked(substream))
 832                 res = snd_pcm_action_group(ops, substream, state, 0);
 833         else
 834                 res = snd_pcm_action_single(ops, substream, state);
 835         up_read(&snd_pcm_link_rwsem);
 836         return res;
 837 }
 838
 839 /*
 840  * start callbacks
 841  */
 842 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 843 {
 844         struct snd_pcm_runtime *runtime = substream->runtime;
 845         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 846                 return -EBADFD;
 847         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 848             !snd_pcm_playback_data(substream))
 849                 return -EPIPE;
 850         runtime->trigger_master = substream;
 851         return 0;
 852 }
 853
 854 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 855 {
 856         if (substream->runtime->trigger_master != substream)
 857                 return 0;
 858         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 859 }
 860
 861 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 862 {
 863         if (substream->runtime->trigger_master == substream)
 864                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 865 }
 866
 867 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 868 {
 869         struct snd_pcm_runtime *runtime = substream->runtime;
 870         snd_pcm_trigger_tstamp(substream);
 871         runtime->hw_ptr_jiffies = jiffies;
 872         runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) /
 873                                                             runtime->rate;
 874         runtime->status->state = state;
 875         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 876             runtime->silence_size > 0)
 877                 snd_pcm_playback_silence(substream, ULONG_MAX);
 878         if (substream->timer)
 879                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 880                                  &runtime->trigger_tstamp);
 881 }
 882
 883 static struct action_ops snd_pcm_action_start = {
 884         .pre_action = snd_pcm_pre_start,
 885         .do_action = snd_pcm_do_start,
 886         .undo_action = snd_pcm_undo_start,
 887         .post_action = snd_pcm_post_start
 888 };
 889
 890 /**
 891  * snd_pcm_start - start all linked streams
 892  * @substream: the PCM substream instance
 893  */
 894 int snd_pcm_start(struct snd_pcm_substream *substream)
 895 {
 896         return snd_pcm_action(&snd_pcm_action_start, substream,
 897                               SNDRV_PCM_STATE_RUNNING);
 898 }
 899
 900 /*
 901  * stop callbacks
 902  */
 903 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 904 {
 905         struct snd_pcm_runtime *runtime = substream->runtime;
 906         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 907                 return -EBADFD;
 908         runtime->trigger_master = substream;
 909         return 0;
 910 }
 911
 912 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 913 {
 914         if (substream->runtime->trigger_master == substream &&
 915             snd_pcm_running(substream))
 916                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 917         return 0; /* unconditonally stop all substreams */
 918 }
 919
 920 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 921 {
 922         struct snd_pcm_runtime *runtime = substream->runtime;
 923         if (runtime->status->state != state) {
 924                 snd_pcm_trigger_tstamp(substream);
 925                 if (substream->timer)
 926                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 927                                          &runtime->trigger_tstamp);
 928                 runtime->status->state = state;
 929         }
 930         wake_up(&runtime->sleep);
 931         wake_up(&runtime->tsleep);
 932 }
 933
 934 static struct action_ops snd_pcm_action_stop = {
 935         .pre_action = snd_pcm_pre_stop,
 936         .do_action = snd_pcm_do_stop,
 937         .post_action = snd_pcm_post_stop
 938 };
 939
 940 /**
 941  * snd_pcm_stop - try to stop all running streams in the substream group
 942  * @substream: the PCM substream instance
 943  * @state: PCM state after stopping the stream
 944  *
 945  * The state of each stream is then changed to the given state unconditionally.
 946  */
 947 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
 948 {
 949         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 950 }
 951
 952 EXPORT_SYMBOL(snd_pcm_stop);
 953
 954 /**
 955  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 956  * @substream: the PCM substream
 957  *
 958  * After stopping, the state is changed to SETUP.
 959  * Unlike snd_pcm_stop(), this affects only the given stream.
 960  */
 961 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 962 {
 963         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 964                                      SNDRV_PCM_STATE_SETUP);
 965 }
 966
 967 /*
 968  * pause callbacks
 969  */
 970 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 971 {
 972         struct snd_pcm_runtime *runtime = substream->runtime;
 973         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 974                 return -ENOSYS;
 975         if (push) {
 976                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 977                         return -EBADFD;
 978         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 979                 return -EBADFD;
 980         runtime->trigger_master = substream;
 981         return 0;
 982 }
 983
 984 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 985 {
 986         if (substream->runtime->trigger_master != substream)
 987                 return 0;
 988         /* some drivers might use hw_ptr to recover from the pause -
 989            update the hw_ptr now */
 990         if (push)
 991                 snd_pcm_update_hw_ptr(substream);
 992         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 993          * a delta between the current jiffies, this gives a large enough
 994          * delta, effectively to skip the check once.
 995          */
 996         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
 997         return substream->ops->trigger(substream,
 998                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 999                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1000 }
1001
1002 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1003 {
1004         if (substream->runtime->trigger_master == substream)
1005                 substream->ops->trigger(substream,
1006                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1007                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1008 }
1009
1010 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1011 {
1012         struct snd_pcm_runtime *runtime = substream->runtime;
1013         snd_pcm_trigger_tstamp(substream);
1014         if (push) {
1015                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1016                 if (substream->timer)
1017                         snd_timer_notify(substream->timer,
1018                                          SNDRV_TIMER_EVENT_MPAUSE,
1019                                          &runtime->trigger_tstamp);
1020                 wake_up(&runtime->sleep);
1021                 wake_up(&runtime->tsleep);
1022         } else {
1023                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1024                 if (substream->timer)
1025                         snd_timer_notify(substream->timer,
1026                                          SNDRV_TIMER_EVENT_MCONTINUE,
1027                                          &runtime->trigger_tstamp);
1028         }
1029 }
1030
1031 static struct action_ops snd_pcm_action_pause = {
1032         .pre_action = snd_pcm_pre_pause,
1033         .do_action = snd_pcm_do_pause,
1034         .undo_action = snd_pcm_undo_pause,
1035         .post_action = snd_pcm_post_pause
1036 };
1037
1038 /*
1039  * Push/release the pause for all linked streams.
1040  */
1041 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1042 {
1043         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1044 }
1045
1046 #ifdef CONFIG_PM
1047 /* suspend */
1048
1049 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1050 {
1051         struct snd_pcm_runtime *runtime = substream->runtime;
1052         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1053                 return -EBUSY;
1054         runtime->trigger_master = substream;
1055         return 0;
1056 }
1057
1058 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1059 {
1060         struct snd_pcm_runtime *runtime = substream->runtime;
1061         if (runtime->trigger_master != substream)
1062                 return 0;
1063         if (! snd_pcm_running(substream))
1064                 return 0;
1065         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1066         return 0; /* suspend unconditionally */
1067 }
1068
1069 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1070 {
1071         struct snd_pcm_runtime *runtime = substream->runtime;
1072         snd_pcm_trigger_tstamp(substream);
1073         if (substream->timer)
1074                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1075                                  &runtime->trigger_tstamp);
1076         runtime->status->suspended_state = runtime->status->state;
1077         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1078         wake_up(&runtime->sleep);
1079         wake_up(&runtime->tsleep);
1080 }
1081
1082 static struct action_ops snd_pcm_action_suspend = {
1083         .pre_action = snd_pcm_pre_suspend,
1084         .do_action = snd_pcm_do_suspend,
1085         .post_action = snd_pcm_post_suspend
1086 };
1087
1088 /**
1089  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1090  * @substream: the PCM substream
1091  *
1092  * After this call, all streams are changed to SUSPENDED state.
1093  */
1094 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1095 {
1096         int err;
1097         unsigned long flags;
1098
1099         if (! substream)
1100                 return 0;
1101
1102         snd_pcm_stream_lock_irqsave(substream, flags);
1103         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1104         snd_pcm_stream_unlock_irqrestore(substream, flags);
1105         return err;
1106 }
1107
1108 EXPORT_SYMBOL(snd_pcm_suspend);
1109
1110 /**
1111  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1112  * @pcm: the PCM instance
1113  *
1114  * After this call, all streams are changed to SUSPENDED state.
1115  */
1116 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1117 {
1118         struct snd_pcm_substream *substream;
1119         int stream, err = 0;
1120
1121         if (! pcm)
1122                 return 0;
1123
1124         for (stream = 0; stream < 2; stream++) {
1125                 for (substream = pcm->streams[stream].substream;
1126                      substream; substream = substream->next) {
1127                         /* FIXME: the open/close code should lock this as well */
1128                         if (substream->runtime == NULL)
1129                                 continue;
1130                         err = snd_pcm_suspend(substream);
1131                         if (err < 0 && err != -EBUSY)
1132                                 return err;
1133                 }
1134         }
1135         return 0;
1136 }
1137
1138 EXPORT_SYMBOL(snd_pcm_suspend_all);
1139
1140 /* resume */
1141
1142 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1143 {
1144         struct snd_pcm_runtime *runtime = substream->runtime;
1145         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1146                 return -ENOSYS;
1147         runtime->trigger_master = substream;
1148         return 0;
1149 }
1150
1151 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1152 {
1153         struct snd_pcm_runtime *runtime = substream->runtime;
1154         if (runtime->trigger_master != substream)
1155                 return 0;
1156         /* DMA not running previously? */
1157         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1158             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1159              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1160                 return 0;
1161         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1162 }
1163
1164 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1165 {
1166         if (substream->runtime->trigger_master == substream &&
1167             snd_pcm_running(substream))
1168                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1169 }
1170
1171 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1172 {
1173         struct snd_pcm_runtime *runtime = substream->runtime;
1174         snd_pcm_trigger_tstamp(substream);
1175         if (substream->timer)
1176                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1177                                  &runtime->trigger_tstamp);
1178         runtime->status->state = runtime->status->suspended_state;
1179 }
1180
1181 static struct action_ops snd_pcm_action_resume = {
1182         .pre_action = snd_pcm_pre_resume,
1183         .do_action = snd_pcm_do_resume,
1184         .undo_action = snd_pcm_undo_resume,
1185         .post_action = snd_pcm_post_resume
1186 };
1187
1188 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1189 {
1190         struct snd_card *card = substream->pcm->card;
1191         int res;
1192
1193         snd_power_lock(card);
1194         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1195                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1196         snd_power_unlock(card);
1197         return res;
1198 }
1199
1200 #else
1201
1202 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1203 {
1204         return -ENOSYS;
1205 }
1206
1207 #endif /* CONFIG_PM */
1208
1209 /*
1210  * xrun ioctl
1211  *
1212  * Change the RUNNING stream(s) to XRUN state.
1213  */
1214 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1215 {
1216         struct snd_card *card = substream->pcm->card;
1217         struct snd_pcm_runtime *runtime = substream->runtime;
1218         int result;
1219
1220         snd_power_lock(card);
1221         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1222                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1223                 if (result < 0)
1224                         goto _unlock;
1225         }
1226
1227         snd_pcm_stream_lock_irq(substream);
1228         switch (runtime->status->state) {
1229         case SNDRV_PCM_STATE_XRUN:
1230                 result = 0;     /* already there */
1231                 break;
1232         case SNDRV_PCM_STATE_RUNNING:
1233                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1234                 break;
1235         default:
1236                 result = -EBADFD;
1237         }
1238         snd_pcm_stream_unlock_irq(substream);
1239  _unlock:
1240         snd_power_unlock(card);
1241         return result;
1242 }
1243
1244 /*
1245  * reset ioctl
1246  */
1247 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1248 {
1249         struct snd_pcm_runtime *runtime = substream->runtime;
1250         switch (runtime->status->state) {
1251         case SNDRV_PCM_STATE_RUNNING:
1252         case SNDRV_PCM_STATE_PREPARED:
1253         case SNDRV_PCM_STATE_PAUSED:
1254         case SNDRV_PCM_STATE_SUSPENDED:
1255                 return 0;
1256         default:
1257                 return -EBADFD;
1258         }
1259 }
1260
1261 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1262 {
1263         struct snd_pcm_runtime *runtime = substream->runtime;
1264         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1265         if (err < 0)
1266                 return err;
1267         runtime->hw_ptr_base = 0;
1268         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1269                 runtime->status->hw_ptr % runtime->period_size;
1270         runtime->silence_start = runtime->status->hw_ptr;
1271         runtime->silence_filled = 0;
1272         return 0;
1273 }
1274
1275 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1276 {
1277         struct snd_pcm_runtime *runtime = substream->runtime;
1278         runtime->control->appl_ptr = runtime->status->hw_ptr;
1279         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1280             runtime->silence_size > 0)
1281                 snd_pcm_playback_silence(substream, ULONG_MAX);
1282 }
1283
1284 static struct action_ops snd_pcm_action_reset = {
1285         .pre_action = snd_pcm_pre_reset,
1286         .do_action = snd_pcm_do_reset,
1287         .post_action = snd_pcm_post_reset
1288 };
1289
1290 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1291 {
1292         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1293 }
1294
1295 /*
1296  * prepare ioctl
1297  */
1298 /* we use the second argument for updating f_flags */
1299 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1300                                int f_flags)
1301 {
1302         struct snd_pcm_runtime *runtime = substream->runtime;
1303         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1304             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1305                 return -EBADFD;
1306         if (snd_pcm_running(substream))
1307                 return -EBUSY;
1308         substream->f_flags = f_flags;
1309         return 0;
1310 }
1311
1312 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1313 {
1314         int err;
1315         err = substream->ops->prepare(substream);
1316         if (err < 0)
1317                 return err;
1318         return snd_pcm_do_reset(substream, 0);
1319 }
1320
1321 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1322 {
1323         struct snd_pcm_runtime *runtime = substream->runtime;
1324         runtime->control->appl_ptr = runtime->status->hw_ptr;
1325         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1326 }
1327
1328 static struct action_ops snd_pcm_action_prepare = {
1329         .pre_action = snd_pcm_pre_prepare,
1330         .do_action = snd_pcm_do_prepare,
1331         .post_action = snd_pcm_post_prepare
1332 };
1333
1334 /**
1335  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1336  * @substream: the PCM substream instance
1337  * @file: file to refer f_flags
1338  */
1339 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1340                            struct file *file)
1341 {
1342         int res;
1343         struct snd_card *card = substream->pcm->card;
1344         int f_flags;
1345
1346         if (file)
1347                 f_flags = file->f_flags;
1348         else
1349                 f_flags = substream->f_flags;
1350
1351         snd_power_lock(card);
1352         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1353                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1354                                                substream, f_flags);
1355         snd_power_unlock(card);
1356         return res;
1357 }
1358
1359 /*
1360  * drain ioctl
1361  */
1362
1363 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1364 {
1365         struct snd_pcm_runtime *runtime = substream->runtime;
1366         switch (runtime->status->state) {
1367         case SNDRV_PCM_STATE_OPEN:
1368         case SNDRV_PCM_STATE_DISCONNECTED:
1369         case SNDRV_PCM_STATE_SUSPENDED:
1370                 return -EBADFD;
1371         }
1372         runtime->trigger_master = substream;
1373         return 0;
1374 }
1375
1376 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1377 {
1378         struct snd_pcm_runtime *runtime = substream->runtime;
1379         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1380                 switch (runtime->status->state) {
1381                 case SNDRV_PCM_STATE_PREPARED:
1382                         /* start playback stream if possible */
1383                         if (! snd_pcm_playback_empty(substream)) {
1384                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1385                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1386                         }
1387                         break;
1388                 case SNDRV_PCM_STATE_RUNNING:
1389                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1390                         break;
1391                 case SNDRV_PCM_STATE_XRUN:
1392                         runtime->status->state = SNDRV_PCM_STATE_SETUP;
1393                         break;
1394                 default:
1395                         break;
1396                 }
1397         } else {
1398                 /* stop running stream */
1399                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1400                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1401                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1402                         snd_pcm_do_stop(substream, new_state);
1403                         snd_pcm_post_stop(substream, new_state);
1404                 }
1405         }
1406         return 0;
1407 }
1408
1409 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1410 {
1411 }
1412
1413 static struct action_ops snd_pcm_action_drain_init = {
1414         .pre_action = snd_pcm_pre_drain_init,
1415         .do_action = snd_pcm_do_drain_init,
1416         .post_action = snd_pcm_post_drain_init
1417 };
1418
1419 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1420
1421 /*
1422  * Drain the stream(s).
1423  * When the substream is linked, sync until the draining of all playback streams
1424  * is finished.
1425  * After this call, all streams are supposed to be either SETUP or DRAINING
1426  * (capture only) state.
1427  */
1428 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1429                          struct file *file)
1430 {
1431         struct snd_card *card;
1432         struct snd_pcm_runtime *runtime;
1433         struct snd_pcm_substream *s;
1434         wait_queue_t wait;
1435         int result = 0;
1436         int nonblock = 0;
1437
1438         card = substream->pcm->card;
1439         runtime = substream->runtime;
1440
1441         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1442                 return -EBADFD;
1443
1444         snd_power_lock(card);
1445         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1446                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1447                 if (result < 0) {
1448                         snd_power_unlock(card);
1449                         return result;
1450                 }
1451         }
1452
1453         if (file) {
1454                 if (file->f_flags & O_NONBLOCK)
1455                         nonblock = 1;
1456         } else if (substream->f_flags & O_NONBLOCK)
1457                 nonblock = 1;
1458
1459         down_read(&snd_pcm_link_rwsem);
1460         snd_pcm_stream_lock_irq(substream);
1461         /* resume pause */
1462         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1463                 snd_pcm_pause(substream, 0);
1464
1465         /* pre-start/stop - all running streams are changed to DRAINING state */
1466         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1467         if (result < 0)
1468                 goto unlock;
1469         /* in non-blocking, we don't wait in ioctl but let caller poll */
1470         if (nonblock) {
1471                 result = -EAGAIN;
1472                 goto unlock;
1473         }
1474
1475         for (;;) {
1476                 long tout;
1477                 struct snd_pcm_runtime *to_check;
1478                 if (signal_pending(current)) {
1479                         result = -ERESTARTSYS;
1480                         break;
1481                 }
1482                 /* find a substream to drain */
1483                 to_check = NULL;
1484                 snd_pcm_group_for_each_entry(s, substream) {
1485                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1486                                 continue;
1487                         runtime = s->runtime;
1488                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1489                                 to_check = runtime;
1490                                 break;
1491                         }
1492                 }
1493                 if (!to_check)
1494                         break; /* all drained */
1495                 init_waitqueue_entry(&wait, current);
1496                 add_wait_queue(&to_check->sleep, &wait);
1497                 snd_pcm_stream_unlock_irq(substream);
1498                 up_read(&snd_pcm_link_rwsem);
1499                 snd_power_unlock(card);
1500                 if (runtime->no_period_wakeup)
1501                         tout = MAX_SCHEDULE_TIMEOUT;
1502                 else {
1503                         tout = 10;
1504                         if (runtime->rate) {
1505                                 long t = runtime->period_size * 2 / runtime->rate;
1506                                 tout = max(t, tout);
1507                         }
1508                         tout = msecs_to_jiffies(tout * 1000);
1509                 }
1510                 tout = schedule_timeout_interruptible(tout);
1511                 snd_power_lock(card);
1512                 down_read(&snd_pcm_link_rwsem);
1513                 snd_pcm_stream_lock_irq(substream);
1514                 remove_wait_queue(&to_check->sleep, &wait);
1515                 if (tout == 0) {
1516                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1517                                 result = -ESTRPIPE;
1518                         else {
1519                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1520                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1521                                 result = -EIO;
1522                         }
1523                         break;
1524                 }
1525         }
1526
1527  unlock:
1528         snd_pcm_stream_unlock_irq(substream);
1529         up_read(&snd_pcm_link_rwsem);
1530         snd_power_unlock(card);
1531
1532         return result;
1533 }
1534
1535 /*
1536  * drop ioctl
1537  *
1538  * Immediately put all linked substreams into SETUP state.
1539  */
1540 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1541 {
1542         struct snd_pcm_runtime *runtime;
1543         int result = 0;
1544
1545         if (PCM_RUNTIME_CHECK(substream))
1546                 return -ENXIO;
1547         runtime = substream->runtime;
1548
1549         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1550             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1551             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1552                 return -EBADFD;
1553
1554         snd_pcm_stream_lock_irq(substream);
1555         /* resume pause */
1556         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1557                 snd_pcm_pause(substream, 0);
1558
1559         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1560         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1561         snd_pcm_stream_unlock_irq(substream);
1562
1563         return result;
1564 }
1565
1566
1567 /* WARNING: Don't forget to fput back the file */
1568 static struct file *snd_pcm_file_fd(int fd, int *fput_needed)
1569 {
1570         struct file *file;
1571         struct inode *inode;
1572         unsigned int minor;
1573
1574         file = fget_light(fd, fput_needed);
1575         if (!file)
1576                 return NULL;
1577         inode = file->f_path.dentry->d_inode;
1578         if (!S_ISCHR(inode->i_mode) ||
1579             imajor(inode) != snd_major) {
1580                 fput_light(file, *fput_needed);
1581                 return NULL;
1582         }
1583         minor = iminor(inode);
1584         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1585             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1586                 fput_light(file, *fput_needed);
1587                 return NULL;
1588         }
1589         return file;
1590 }
1591
1592 /*
1593  * PCM link handling
1594  */
1595 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1596 {
1597         int res = 0;
1598         struct file *file;
1599         struct snd_pcm_file *pcm_file;
1600         struct snd_pcm_substream *substream1;
1601         struct snd_pcm_group *group;
1602         int fput_needed;
1603
1604         file = snd_pcm_file_fd(fd, &fput_needed);
1605         if (!file)
1606                 return -EBADFD;
1607         pcm_file = file->private_data;
1608         substream1 = pcm_file->substream;
1609         group = kmalloc(sizeof(*group), GFP_KERNEL);
1610         if (!group) {
1611                 res = -ENOMEM;
1612                 goto _nolock;
1613         }
1614         down_write(&snd_pcm_link_rwsem);
1615         write_lock_irq(&snd_pcm_link_rwlock);
1616         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1617             substream->runtime->status->state != substream1->runtime->status->state) {
1618                 res = -EBADFD;
1619                 goto _end;
1620         }
1621         if (snd_pcm_stream_linked(substream1)) {
1622                 res = -EALREADY;
1623                 goto _end;
1624         }
1625         if (!snd_pcm_stream_linked(substream)) {
1626                 substream->group = group;
1627                 spin_lock_init(&substream->group->lock);
1628                 INIT_LIST_HEAD(&substream->group->substreams);
1629                 list_add_tail(&substream->link_list, &substream->group->substreams);
1630                 substream->group->count = 1;
1631         }
1632         list_add_tail(&substream1->link_list, &substream->group->substreams);
1633         substream->group->count++;
1634         substream1->group = substream->group;
1635  _end:
1636         write_unlock_irq(&snd_pcm_link_rwlock);
1637         up_write(&snd_pcm_link_rwsem);
1638  _nolock:
1639         fput_light(file, fput_needed);
1640         if (res < 0)
1641                 kfree(group);
1642         return res;
1643 }
1644
1645 static void relink_to_local(struct snd_pcm_substream *substream)
1646 {
1647         substream->group = &substream->self_group;
1648         INIT_LIST_HEAD(&substream->self_group.substreams);
1649         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1650 }
1651
1652 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1653 {
1654         struct snd_pcm_substream *s;
1655         int res = 0;
1656
1657         down_write(&snd_pcm_link_rwsem);
1658         write_lock_irq(&snd_pcm_link_rwlock);
1659         if (!snd_pcm_stream_linked(substream)) {
1660                 res = -EALREADY;
1661                 goto _end;
1662         }
1663         list_del(&substream->link_list);
1664         substream->group->count--;
1665         if (substream->group->count == 1) {     /* detach the last stream, too */
1666                 snd_pcm_group_for_each_entry(s, substream) {
1667                         relink_to_local(s);
1668                         break;
1669                 }
1670                 kfree(substream->group);
1671         }
1672         relink_to_local(substream);
1673        _end:
1674         write_unlock_irq(&snd_pcm_link_rwlock);
1675         up_write(&snd_pcm_link_rwsem);
1676         return res;
1677 }
1678
1679 /*
1680  * hw configurator
1681  */
1682 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1683                                struct snd_pcm_hw_rule *rule)
1684 {
1685         struct snd_interval t;
1686         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1687                      hw_param_interval_c(params, rule->deps[1]), &t);
1688         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689 }
1690
1691 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1692                                struct snd_pcm_hw_rule *rule)
1693 {
1694         struct snd_interval t;
1695         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1696                      hw_param_interval_c(params, rule->deps[1]), &t);
1697         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1698 }
1699
1700 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1701                                    struct snd_pcm_hw_rule *rule)
1702 {
1703         struct snd_interval t;
1704         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1705                          hw_param_interval_c(params, rule->deps[1]),
1706                          (unsigned long) rule->private, &t);
1707         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1708 }
1709
1710 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1711                                    struct snd_pcm_hw_rule *rule)
1712 {
1713         struct snd_interval t;
1714         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1715                          (unsigned long) rule->private,
1716                          hw_param_interval_c(params, rule->deps[1]), &t);
1717         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1718 }
1719
1720 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1721                                   struct snd_pcm_hw_rule *rule)
1722 {
1723         unsigned int k;
1724         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1725         struct snd_mask m;
1726         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1727         snd_mask_any(&m);
1728         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1729                 int bits;
1730                 if (! snd_mask_test(mask, k))
1731                         continue;
1732                 bits = snd_pcm_format_physical_width(k);
1733                 if (bits <= 0)
1734                         continue; /* ignore invalid formats */
1735                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1736                         snd_mask_reset(&m, k);
1737         }
1738         return snd_mask_refine(mask, &m);
1739 }
1740
1741 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1742                                        struct snd_pcm_hw_rule *rule)
1743 {
1744         struct snd_interval t;
1745         unsigned int k;
1746         t.min = UINT_MAX;
1747         t.max = 0;
1748         t.openmin = 0;
1749         t.openmax = 0;
1750         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1751                 int bits;
1752                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1753                         continue;
1754                 bits = snd_pcm_format_physical_width(k);
1755                 if (bits <= 0)
1756                         continue; /* ignore invalid formats */
1757                 if (t.min > (unsigned)bits)
1758                         t.min = bits;
1759                 if (t.max < (unsigned)bits)
1760                         t.max = bits;
1761         }
1762         t.integer = 1;
1763         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1764 }
1765
1766 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1767 #error "Change this table"
1768 #endif
1769
1770 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1771                                  48000, 64000, 88200, 96000, 176400, 192000 };
1772
1773 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1774         .count = ARRAY_SIZE(rates),
1775         .list = rates,
1776 };
1777
1778 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1779                                 struct snd_pcm_hw_rule *rule)
1780 {
1781         struct snd_pcm_hardware *hw = rule->private;
1782         return snd_interval_list(hw_param_interval(params, rule->var),
1783                                  snd_pcm_known_rates.count,
1784                                  snd_pcm_known_rates.list, hw->rates);
1785 }
1786
1787 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1788                                             struct snd_pcm_hw_rule *rule)
1789 {
1790         struct snd_interval t;
1791         struct snd_pcm_substream *substream = rule->private;
1792         t.min = 0;
1793         t.max = substream->buffer_bytes_max;
1794         t.openmin = 0;
1795         t.openmax = 0;
1796         t.integer = 1;
1797         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1798 }
1799
1800 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1801 {
1802         struct snd_pcm_runtime *runtime = substream->runtime;
1803         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1804         int k, err;
1805
1806         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1807                 snd_mask_any(constrs_mask(constrs, k));
1808         }
1809
1810         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1811                 snd_interval_any(constrs_interval(constrs, k));
1812         }
1813
1814         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1815         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1816         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1817         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1818         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1819
1820         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1821                                    snd_pcm_hw_rule_format, NULL,
1822                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1823         if (err < 0)
1824                 return err;
1825         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1826                                   snd_pcm_hw_rule_sample_bits, NULL,
1827                                   SNDRV_PCM_HW_PARAM_FORMAT,
1828                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1829         if (err < 0)
1830                 return err;
1831         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1832                                   snd_pcm_hw_rule_div, NULL,
1833                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -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_mul, NULL,
1838                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1842                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1843                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1844         if (err < 0)
1845                 return err;
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1847                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1848                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1852                                   snd_pcm_hw_rule_div, NULL,
1853                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1857                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1858                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1862                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1863                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1867                                   snd_pcm_hw_rule_div, NULL,
1868                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -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_div, NULL,
1873                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1877                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1878                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1879         if (err < 0)
1880                 return err;
1881         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1882                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1883                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -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_mul, NULL,
1888                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1889         if (err < 0)
1890                 return err;
1891         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1892                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1893                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 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_SIZE,
1897                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1898                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1899         if (err < 0)
1900                 return err;
1901         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1902                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1903                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1904         if (err < 0)
1905                 return err;
1906         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1907                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1908                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1909         if (err < 0)
1910                 return err;
1911         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1912                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1913                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1914         if (err < 0)
1915                 return err;
1916         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1917                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1918                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1919         if (err < 0)
1920                 return err;
1921         return 0;
1922 }
1923
1924 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1925 {
1926         struct snd_pcm_runtime *runtime = substream->runtime;
1927         struct snd_pcm_hardware *hw = &runtime->hw;
1928         int err;
1929         unsigned int mask = 0;
1930
1931         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1932                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1933         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1934                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1935         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1936                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1937                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1938                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1939                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1940                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1941                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1942         }
1943         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1944         if (err < 0)
1945                 return err;
1946
1947         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1948         if (err < 0)
1949                 return err;
1950
1951         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1952         if (err < 0)
1953                 return err;
1954
1955         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1956                                            hw->channels_min, hw->channels_max);
1957         if (err < 0)
1958                 return err;
1959
1960         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1961                                            hw->rate_min, hw->rate_max);
1962         if (err < 0)
1963                 return err;
1964
1965         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1966                                            hw->period_bytes_min, hw->period_bytes_max);
1967         if (err < 0)
1968                 return err;
1969
1970         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1971                                            hw->periods_min, hw->periods_max);
1972         if (err < 0)
1973                 return err;
1974
1975         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1976                                            hw->period_bytes_min, hw->buffer_bytes_max);
1977         if (err < 0)
1978                 return err;
1979
1980         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1981                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1982                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1983         if (err < 0)
1984                 return err;
1985
1986         /* FIXME: remove */
1987         if (runtime->dma_bytes) {
1988                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1989                 if (err < 0)
1990                         return -EINVAL;
1991         }
1992
1993         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1994                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1995                                           snd_pcm_hw_rule_rate, hw,
1996                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1997                 if (err < 0)
1998                         return err;
1999         }
2000
2001         /* FIXME: this belong to lowlevel */
2002         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2003
2004         return 0;
2005 }
2006
2007 static void pcm_release_private(struct snd_pcm_substream *substream)
2008 {
2009         snd_pcm_unlink(substream);
2010 }
2011
2012 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2013 {
2014         substream->ref_count--;
2015         if (substream->ref_count > 0)
2016                 return;
2017
2018         snd_pcm_drop(substream);
2019         if (substream->hw_opened) {
2020                 if (substream->ops->hw_free != NULL)
2021                         substream->ops->hw_free(substream);
2022                 substream->ops->close(substream);
2023                 substream->hw_opened = 0;
2024         }
2025         if (pm_qos_request_active(&substream->latency_pm_qos_req))
2026                 pm_qos_remove_request(&substream->latency_pm_qos_req);
2027         if (substream->pcm_release) {
2028                 substream->pcm_release(substream);
2029                 substream->pcm_release = NULL;
2030         }
2031         snd_pcm_detach_substream(substream);
2032 }
2033
2034 EXPORT_SYMBOL(snd_pcm_release_substream);
2035
2036 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2037                            struct file *file,
2038                            struct snd_pcm_substream **rsubstream)
2039 {
2040         struct snd_pcm_substream *substream;
2041         int err;
2042
2043         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2044         if (err < 0)
2045                 return err;
2046         if (substream->ref_count > 1) {
2047                 *rsubstream = substream;
2048                 return 0;
2049         }
2050
2051         err = snd_pcm_hw_constraints_init(substream);
2052         if (err < 0) {
2053                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2054                 goto error;
2055         }
2056
2057         if ((err = substream->ops->open(substream)) < 0)
2058                 goto error;
2059
2060         substream->hw_opened = 1;
2061
2062         err = snd_pcm_hw_constraints_complete(substream);
2063         if (err < 0) {
2064                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2065                 goto error;
2066         }
2067
2068         *rsubstream = substream;
2069         return 0;
2070
2071  error:
2072         snd_pcm_release_substream(substream);
2073         return err;
2074 }
2075
2076 EXPORT_SYMBOL(snd_pcm_open_substream);
2077
2078 static int snd_pcm_open_file(struct file *file,
2079                              struct snd_pcm *pcm,
2080                              int stream)
2081 {
2082         struct snd_pcm_file *pcm_file;
2083         struct snd_pcm_substream *substream;
2084         int err;
2085
2086         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2087         if (err < 0)
2088                 return err;
2089
2090         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2091         if (pcm_file == NULL) {
2092                 snd_pcm_release_substream(substream);
2093                 return -ENOMEM;
2094         }
2095         pcm_file->substream = substream;
2096         if (substream->ref_count == 1) {
2097                 substream->file = pcm_file;
2098                 substream->pcm_release = pcm_release_private;
2099         }
2100         file->private_data = pcm_file;
2101
2102         return 0;
2103 }
2104
2105 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2106 {
2107         struct snd_pcm *pcm;
2108         int err = nonseekable_open(inode, file);
2109         if (err < 0)
2110                 return err;
2111         pcm = snd_lookup_minor_data(iminor(inode),
2112                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2113         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2114 }
2115
2116 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2117 {
2118         struct snd_pcm *pcm;
2119         int err = nonseekable_open(inode, file);
2120         if (err < 0)
2121                 return err;
2122         pcm = snd_lookup_minor_data(iminor(inode),
2123                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2124         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2125 }
2126
2127 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2128 {
2129         int err;
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);
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_DONTEXPAND | VM_DONTDUMP;
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_DONTEXPAND | VM_DONTDUMP;
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 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
3173                              struct vm_area_struct *area)
3174 {
3175         area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
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 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);
3194
3195 /*
3196  * mmap the DMA buffer on I/O memory area
3197  */
3198 #if SNDRV_PCM_INFO_MMAP_IOMEM
3199 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3200                            struct vm_area_struct *area)
3201 {
3202         long size;
3203         unsigned long offset;
3204
3205         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3206         area->vm_flags |= VM_IO;
3207         size = area->vm_end - area->vm_start;
3208         offset = area->vm_pgoff << PAGE_SHIFT;
3209         if (io_remap_pfn_range(area, area->vm_start,
3210                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3211                                 size, area->vm_page_prot))
3212                 return -EAGAIN;
3213         return 0;
3214 }
3215
3216 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3217 #endif /* SNDRV_PCM_INFO_MMAP */
3218
3219 /*
3220  * mmap DMA buffer
3221  */
3222 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3223                       struct vm_area_struct *area)
3224 {
3225         struct snd_pcm_runtime *runtime;
3226         long size;
3227         unsigned long offset;
3228         size_t dma_bytes;
3229         int err;
3230
3231         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3232                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3233                         return -EINVAL;
3234         } else {
3235                 if (!(area->vm_flags & VM_READ))
3236                         return -EINVAL;
3237         }
3238         runtime = substream->runtime;
3239         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3240                 return -EBADFD;
3241         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3242                 return -ENXIO;
3243         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3244             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3245                 return -EINVAL;
3246         size = area->vm_end - area->vm_start;
3247         offset = area->vm_pgoff << PAGE_SHIFT;
3248         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3249         if ((size_t)size > dma_bytes)
3250                 return -EINVAL;
3251         if (offset > dma_bytes - size)
3252                 return -EINVAL;
3253
3254         area->vm_ops = &snd_pcm_vm_ops_data;
3255         area->vm_private_data = substream;
3256         if (substream->ops->mmap)
3257                 err = substream->ops->mmap(substream, area);
3258         else
3259                 err = snd_pcm_lib_default_mmap(substream, area);
3260         if (!err)
3261                 atomic_inc(&substream->mmap_count);
3262         return err;
3263 }
3264
3265 EXPORT_SYMBOL(snd_pcm_mmap_data);
3266
3267 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3268 {
3269         struct snd_pcm_file * pcm_file;
3270         struct snd_pcm_substream *substream;
3271         unsigned long offset;
3272
3273         pcm_file = file->private_data;
3274         substream = pcm_file->substream;
3275         if (PCM_RUNTIME_CHECK(substream))
3276                 return -ENXIO;
3277
3278         offset = area->vm_pgoff << PAGE_SHIFT;
3279         switch (offset) {
3280         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3281                 if (pcm_file->no_compat_mmap)
3282                         return -ENXIO;
3283                 return snd_pcm_mmap_status(substream, file, area);
3284         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3285                 if (pcm_file->no_compat_mmap)
3286                         return -ENXIO;
3287                 return snd_pcm_mmap_control(substream, file, area);
3288         default:
3289                 return snd_pcm_mmap_data(substream, file, area);
3290         }
3291         return 0;
3292 }
3293
3294 static int snd_pcm_fasync(int fd, struct file * file, int on)
3295 {
3296         struct snd_pcm_file * pcm_file;
3297         struct snd_pcm_substream *substream;
3298         struct snd_pcm_runtime *runtime;
3299
3300         pcm_file = file->private_data;
3301         substream = pcm_file->substream;
3302         if (PCM_RUNTIME_CHECK(substream))
3303                 return -ENXIO;
3304         runtime = substream->runtime;
3305         return fasync_helper(fd, file, on, &runtime->fasync);
3306 }
3307
3308 /*
3309  * ioctl32 compat
3310  */
3311 #ifdef CONFIG_COMPAT
3312 #include "pcm_compat.c"
3313 #else
3314 #define snd_pcm_ioctl_compat    NULL
3315 #endif
3316
3317 /*
3318  *  To be removed helpers to keep binary compatibility
3319  */
3320
3321 #ifdef CONFIG_SND_SUPPORT_OLD_API
3322 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3323 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3324
3325 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3326                                                struct snd_pcm_hw_params_old *oparams)
3327 {
3328         unsigned int i;
3329
3330         memset(params, 0, sizeof(*params));
3331         params->flags = oparams->flags;
3332         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3333                 params->masks[i].bits[0] = oparams->masks[i];
3334         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3335         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3336         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3337         params->info = oparams->info;
3338         params->msbits = oparams->msbits;
3339         params->rate_num = oparams->rate_num;
3340         params->rate_den = oparams->rate_den;
3341         params->fifo_size = oparams->fifo_size;
3342 }
3343
3344 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3345                                              struct snd_pcm_hw_params *params)
3346 {
3347         unsigned int i;
3348
3349         memset(oparams, 0, sizeof(*oparams));
3350         oparams->flags = params->flags;
3351         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3352                 oparams->masks[i] = params->masks[i].bits[0];
3353         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3354         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3355         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3356         oparams->info = params->info;
3357         oparams->msbits = params->msbits;
3358         oparams->rate_num = params->rate_num;
3359         oparams->rate_den = params->rate_den;
3360         oparams->fifo_size = params->fifo_size;
3361 }
3362
3363 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3364                                       struct snd_pcm_hw_params_old __user * _oparams)
3365 {
3366         struct snd_pcm_hw_params *params;
3367         struct snd_pcm_hw_params_old *oparams = NULL;
3368         int err;
3369
3370         params = kmalloc(sizeof(*params), GFP_KERNEL);
3371         if (!params)
3372                 return -ENOMEM;
3373
3374         oparams = memdup_user(_oparams, sizeof(*oparams));
3375         if (IS_ERR(oparams)) {
3376                 err = PTR_ERR(oparams);
3377                 goto out;
3378         }
3379         snd_pcm_hw_convert_from_old_params(params, oparams);
3380         err = snd_pcm_hw_refine(substream, params);
3381         snd_pcm_hw_convert_to_old_params(oparams, params);
3382         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3383                 if (!err)
3384                         err = -EFAULT;
3385         }
3386
3387         kfree(oparams);
3388 out:
3389         kfree(params);
3390         return err;
3391 }
3392
3393 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3394                                       struct snd_pcm_hw_params_old __user * _oparams)
3395 {
3396         struct snd_pcm_hw_params *params;
3397         struct snd_pcm_hw_params_old *oparams = NULL;
3398         int err;
3399
3400         params = kmalloc(sizeof(*params), GFP_KERNEL);
3401         if (!params)
3402                 return -ENOMEM;
3403
3404         oparams = memdup_user(_oparams, sizeof(*oparams));
3405         if (IS_ERR(oparams)) {
3406                 err = PTR_ERR(oparams);
3407                 goto out;
3408         }
3409         snd_pcm_hw_convert_from_old_params(params, oparams);
3410         err = snd_pcm_hw_params(substream, params);
3411         snd_pcm_hw_convert_to_old_params(oparams, params);
3412         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3413                 if (!err)
3414                         err = -EFAULT;
3415         }
3416
3417         kfree(oparams);
3418 out:
3419         kfree(params);
3420         return err;
3421 }
3422 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3423
3424 #ifndef CONFIG_MMU
3425 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3426                                                unsigned long addr,
3427                                                unsigned long len,
3428                                                unsigned long pgoff,
3429                                                unsigned long flags)
3430 {
3431         struct snd_pcm_file *pcm_file = file->private_data;
3432         struct snd_pcm_substream *substream = pcm_file->substream;
3433         struct snd_pcm_runtime *runtime = substream->runtime;
3434         unsigned long offset = pgoff << PAGE_SHIFT;
3435
3436         switch (offset) {
3437         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3438                 return (unsigned long)runtime->status;
3439         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3440                 return (unsigned long)runtime->control;
3441         default:
3442                 return (unsigned long)runtime->dma_area + offset;
3443         }
3444 }
3445 #else
3446 # define snd_pcm_get_unmapped_area NULL
3447 #endif
3448
3449 /*
3450  *  Register section
3451  */
3452
3453 const struct file_operations snd_pcm_f_ops[2] = {
3454         {
3455                 .owner =                THIS_MODULE,
3456                 .write =                snd_pcm_write,
3457                 .aio_write =            snd_pcm_aio_write,
3458                 .open =                 snd_pcm_playback_open,
3459                 .release =              snd_pcm_release,
3460                 .llseek =               no_llseek,
3461                 .poll =                 snd_pcm_playback_poll,
3462                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3463                 .compat_ioctl =         snd_pcm_ioctl_compat,
3464                 .mmap =                 snd_pcm_mmap,
3465                 .fasync =               snd_pcm_fasync,
3466                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3467         },
3468         {
3469                 .owner =                THIS_MODULE,
3470                 .read =                 snd_pcm_read,
3471                 .aio_read =             snd_pcm_aio_read,
3472                 .open =                 snd_pcm_capture_open,
3473                 .release =              snd_pcm_release,
3474                 .llseek =               no_llseek,
3475                 .poll =                 snd_pcm_capture_poll,
3476                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3477                 .compat_ioctl =         snd_pcm_ioctl_compat,
3478                 .mmap =                 snd_pcm_mmap,
3479                 .fasync =               snd_pcm_fasync,
3480                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3481         }
3482 };