sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos_params.h>
  28 #include <linux/uio.h>
  29 #include <sound/core.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/timer.h>
  35 #include <sound/minors.h>
  36 #include <asm/io.h>
  37
  38 /*
  39  *  Compatibility
  40  */
  41
  42 struct snd_pcm_hw_params_old {
  43         unsigned int flags;
  44         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  45                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  46         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  47                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  48         unsigned int rmask;
  49         unsigned int cmask;
  50         unsigned int info;
  51         unsigned int msbits;
  52         unsigned int rate_num;
  53         unsigned int rate_den;
  54         snd_pcm_uframes_t fifo_size;
  55         unsigned char reserved[64];
  56 };
  57
  58 #ifdef CONFIG_SND_SUPPORT_OLD_API
  59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  61
  62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  63                                       struct snd_pcm_hw_params_old __user * _oparams);
  64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 #endif
  67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  68
  69 /*
  70  *
  71  */
  72
  73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  75
  76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  77
  78 static inline mm_segment_t snd_enter_user(void)
  79 {
  80         mm_segment_t fs = get_fs();
  81         set_fs(get_ds());
  82         return fs;
  83 }
  84
  85 static inline void snd_leave_user(mm_segment_t fs)
  86 {
  87         set_fs(fs);
  88 }
  89
  90
  91
  92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  93 {
  94         struct snd_pcm_runtime *runtime;
  95         struct snd_pcm *pcm = substream->pcm;
  96         struct snd_pcm_str *pstr = substream->pstr;
  97
  98         memset(info, 0, sizeof(*info));
  99         info->card = pcm->card->number;
 100         info->device = pcm->device;
 101         info->stream = substream->stream;
 102         info->subdevice = substream->number;
 103         strlcpy(info->id, pcm->id, sizeof(info->id));
 104         strlcpy(info->name, pcm->name, sizeof(info->name));
 105         info->dev_class = pcm->dev_class;
 106         info->dev_subclass = pcm->dev_subclass;
 107         info->subdevices_count = pstr->substream_count;
 108         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 109         strlcpy(info->subname, substream->name, sizeof(info->subname));
 110         runtime = substream->runtime;
 111         /* AB: FIXME!!! This is definitely nonsense */
 112         if (runtime) {
 113                 info->sync = runtime->sync;
 114                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 115         }
 116         return 0;
 117 }
 118
 119 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 120                       struct snd_pcm_info __user * _info)
 121 {
 122         struct snd_pcm_info *info;
 123         int err;
 124
 125         info = kmalloc(sizeof(*info), GFP_KERNEL);
 126         if (! info)
 127                 return -ENOMEM;
 128         err = snd_pcm_info(substream, info);
 129         if (err >= 0) {
 130                 if (copy_to_user(_info, info, sizeof(*info)))
 131                         err = -EFAULT;
 132         }
 133         kfree(info);
 134         return err;
 135 }
 136
 137 #undef RULES_DEBUG
 138
 139 #ifdef RULES_DEBUG
 140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 141 char *snd_pcm_hw_param_names[] = {
 142         HW_PARAM(ACCESS),
 143         HW_PARAM(FORMAT),
 144         HW_PARAM(SUBFORMAT),
 145         HW_PARAM(SAMPLE_BITS),
 146         HW_PARAM(FRAME_BITS),
 147         HW_PARAM(CHANNELS),
 148         HW_PARAM(RATE),
 149         HW_PARAM(PERIOD_TIME),
 150         HW_PARAM(PERIOD_SIZE),
 151         HW_PARAM(PERIOD_BYTES),
 152         HW_PARAM(PERIODS),
 153         HW_PARAM(BUFFER_TIME),
 154         HW_PARAM(BUFFER_SIZE),
 155         HW_PARAM(BUFFER_BYTES),
 156         HW_PARAM(TICK_TIME),
 157 };
 158 #endif
 159
 160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 161                       struct snd_pcm_hw_params *params)
 162 {
 163         unsigned int k;
 164         struct snd_pcm_hardware *hw;
 165         struct snd_interval *i = NULL;
 166         struct snd_mask *m = NULL;
 167         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 168         unsigned int rstamps[constrs->rules_num];
 169         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 170         unsigned int stamp = 2;
 171         int changed, again;
 172
 173         params->info = 0;
 174         params->fifo_size = 0;
 175         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 176                 params->msbits = 0;
 177         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 178                 params->rate_num = 0;
 179                 params->rate_den = 0;
 180         }
 181
 182         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 183                 m = hw_param_mask(params, k);
 184                 if (snd_mask_empty(m))
 185                         return -EINVAL;
 186                 if (!(params->rmask & (1 << k)))
 187                         continue;
 188 #ifdef RULES_DEBUG
 189                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 190                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 191 #endif
 192                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 193 #ifdef RULES_DEBUG
 194                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 if (changed)
 197                         params->cmask |= 1 << k;
 198                 if (changed < 0)
 199                         return changed;
 200         }
 201
 202         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 203                 i = hw_param_interval(params, k);
 204                 if (snd_interval_empty(i))
 205                         return -EINVAL;
 206                 if (!(params->rmask & (1 << k)))
 207                         continue;
 208 #ifdef RULES_DEBUG
 209                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 210                 if (i->empty)
 211                         printk("empty");
 212                 else
 213                         printk("%c%u %u%c",
 214                                i->openmin ? '(' : '[', i->min,
 215                                i->max, i->openmax ? ')' : ']');
 216                 printk(" -> ");
 217 #endif
 218                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 219 #ifdef RULES_DEBUG
 220                 if (i->empty)
 221                         printk("empty\n");
 222                 else
 223                         printk("%c%u %u%c\n",
 224                                i->openmin ? '(' : '[', i->min,
 225                                i->max, i->openmax ? ')' : ']');
 226 #endif
 227                 if (changed)
 228                         params->cmask |= 1 << k;
 229                 if (changed < 0)
 230                         return changed;
 231         }
 232
 233         for (k = 0; k < constrs->rules_num; k++)
 234                 rstamps[k] = 0;
 235         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 236                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 237         do {
 238                 again = 0;
 239                 for (k = 0; k < constrs->rules_num; k++) {
 240                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 241                         unsigned int d;
 242                         int doit = 0;
 243                         if (r->cond && !(r->cond & params->flags))
 244                                 continue;
 245                         for (d = 0; r->deps[d] >= 0; d++) {
 246                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 247                                         doit = 1;
 248                                         break;
 249                                 }
 250                         }
 251                         if (!doit)
 252                                 continue;
 253 #ifdef RULES_DEBUG
 254                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 255                         if (r->var >= 0) {
 256                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 257                                 if (hw_is_mask(r->var)) {
 258                                         m = hw_param_mask(params, r->var);
 259                                         printk("%x", *m->bits);
 260                                 } else {
 261                                         i = hw_param_interval(params, r->var);
 262                                         if (i->empty)
 263                                                 printk("empty");
 264                                         else
 265                                                 printk("%c%u %u%c",
 266                                                        i->openmin ? '(' : '[', i->min,
 267                                                        i->max, i->openmax ? ')' : ']');
 268                                 }
 269                         }
 270 #endif
 271                         changed = r->func(params, r);
 272 #ifdef RULES_DEBUG
 273                         if (r->var >= 0) {
 274                                 printk(" -> ");
 275                                 if (hw_is_mask(r->var))
 276                                         printk("%x", *m->bits);
 277                                 else {
 278                                         if (i->empty)
 279                                                 printk("empty");
 280                                         else
 281                                                 printk("%c%u %u%c",
 282                                                        i->openmin ? '(' : '[', i->min,
 283                                                        i->max, i->openmax ? ')' : ']');
 284                                 }
 285                         }
 286                         printk("\n");
 287 #endif
 288                         rstamps[k] = stamp;
 289                         if (changed && r->var >= 0) {
 290                                 params->cmask |= (1 << r->var);
 291                                 vstamps[r->var] = stamp;
 292                                 again = 1;
 293                         }
 294                         if (changed < 0)
 295                                 return changed;
 296                         stamp++;
 297                 }
 298         } while (again);
 299         if (!params->msbits) {
 300                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 301                 if (snd_interval_single(i))
 302                         params->msbits = snd_interval_value(i);
 303         }
 304
 305         if (!params->rate_den) {
 306                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 307                 if (snd_interval_single(i)) {
 308                         params->rate_num = snd_interval_value(i);
 309                         params->rate_den = 1;
 310                 }
 311         }
 312
 313         hw = &substream->runtime->hw;
 314         if (!params->info)
 315                 params->info = hw->info;
 316         if (!params->fifo_size)
 317                 params->fifo_size = hw->fifo_size;
 318         params->rmask = 0;
 319         return 0;
 320 }
 321
 322 EXPORT_SYMBOL(snd_pcm_hw_refine);
 323
 324 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 325                                   struct snd_pcm_hw_params __user * _params)
 326 {
 327         struct snd_pcm_hw_params *params;
 328         int err;
 329
 330         params = memdup_user(_params, sizeof(*params));
 331         if (IS_ERR(params))
 332                 return PTR_ERR(params);
 333
 334         err = snd_pcm_hw_refine(substream, params);
 335         if (copy_to_user(_params, params, sizeof(*params))) {
 336                 if (!err)
 337                         err = -EFAULT;
 338         }
 339
 340         kfree(params);
 341         return err;
 342 }
 343
 344 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 345 {
 346         int usecs;
 347
 348         if (! runtime->rate)
 349                 return -1; /* invalid */
 350
 351         /* take 75% of period time as the deadline */
 352         usecs = (750000 / runtime->rate) * runtime->period_size;
 353         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 354                 runtime->rate;
 355
 356         return usecs;
 357 }
 358
 359 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 360                              struct snd_pcm_hw_params *params)
 361 {
 362         struct snd_pcm_runtime *runtime;
 363         int err, usecs;
 364         unsigned int bits;
 365         snd_pcm_uframes_t frames;
 366
 367         if (PCM_RUNTIME_CHECK(substream))
 368                 return -ENXIO;
 369         runtime = substream->runtime;
 370         snd_pcm_stream_lock_irq(substream);
 371         switch (runtime->status->state) {
 372         case SNDRV_PCM_STATE_OPEN:
 373         case SNDRV_PCM_STATE_SETUP:
 374         case SNDRV_PCM_STATE_PREPARED:
 375                 break;
 376         default:
 377                 snd_pcm_stream_unlock_irq(substream);
 378                 return -EBADFD;
 379         }
 380         snd_pcm_stream_unlock_irq(substream);
 381 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 382         if (!substream->oss.oss)
 383 #endif
 384                 if (atomic_read(&substream->mmap_count))
 385                         return -EBADFD;
 386
 387         params->rmask = ~0U;
 388         err = snd_pcm_hw_refine(substream, params);
 389         if (err < 0)
 390                 goto _error;
 391
 392         err = snd_pcm_hw_params_choose(substream, params);
 393         if (err < 0)
 394                 goto _error;
 395
 396         if (substream->ops->hw_params != NULL) {
 397                 err = substream->ops->hw_params(substream, params);
 398                 if (err < 0)
 399                         goto _error;
 400         }
 401
 402         runtime->access = params_access(params);
 403         runtime->format = params_format(params);
 404         runtime->subformat = params_subformat(params);
 405         runtime->channels = params_channels(params);
 406         runtime->rate = params_rate(params);
 407         runtime->period_size = params_period_size(params);
 408         runtime->periods = params_periods(params);
 409         runtime->buffer_size = params_buffer_size(params);
 410         runtime->info = params->info;
 411         runtime->rate_num = params->rate_num;
 412         runtime->rate_den = params->rate_den;
 413
 414         bits = snd_pcm_format_physical_width(runtime->format);
 415         runtime->sample_bits = bits;
 416         bits *= runtime->channels;
 417         runtime->frame_bits = bits;
 418         frames = 1;
 419         while (bits % 8 != 0) {
 420                 bits *= 2;
 421                 frames *= 2;
 422         }
 423         runtime->byte_align = bits / 8;
 424         runtime->min_align = frames;
 425
 426         /* Default sw params */
 427         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 428         runtime->period_step = 1;
 429         runtime->control->avail_min = runtime->period_size;
 430         runtime->start_threshold = 1;
 431         runtime->stop_threshold = runtime->buffer_size;
 432         runtime->silence_threshold = 0;
 433         runtime->silence_size = 0;
 434         runtime->boundary = runtime->buffer_size;
 435         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 436                 runtime->boundary *= 2;
 437
 438         snd_pcm_timer_resolution_change(substream);
 439         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 440
 441         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 442                                 substream->latency_id);
 443         if ((usecs = period_to_usecs(runtime)) >= 0)
 444                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
 445                                         substream->latency_id, usecs);
 446         return 0;
 447  _error:
 448         /* hardware might be unuseable from this time,
 449            so we force application to retry to set
 450            the correct hardware parameter settings */
 451         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 452         if (substream->ops->hw_free != NULL)
 453                 substream->ops->hw_free(substream);
 454         return err;
 455 }
 456
 457 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 458                                   struct snd_pcm_hw_params __user * _params)
 459 {
 460         struct snd_pcm_hw_params *params;
 461         int err;
 462
 463         params = memdup_user(_params, sizeof(*params));
 464         if (IS_ERR(params))
 465                 return PTR_ERR(params);
 466
 467         err = snd_pcm_hw_params(substream, params);
 468         if (copy_to_user(_params, params, sizeof(*params))) {
 469                 if (!err)
 470                         err = -EFAULT;
 471         }
 472
 473         kfree(params);
 474         return err;
 475 }
 476
 477 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 478 {
 479         struct snd_pcm_runtime *runtime;
 480         int result = 0;
 481
 482         if (PCM_RUNTIME_CHECK(substream))
 483                 return -ENXIO;
 484         runtime = substream->runtime;
 485         snd_pcm_stream_lock_irq(substream);
 486         switch (runtime->status->state) {
 487         case SNDRV_PCM_STATE_SETUP:
 488         case SNDRV_PCM_STATE_PREPARED:
 489                 break;
 490         default:
 491                 snd_pcm_stream_unlock_irq(substream);
 492                 return -EBADFD;
 493         }
 494         snd_pcm_stream_unlock_irq(substream);
 495         if (atomic_read(&substream->mmap_count))
 496                 return -EBADFD;
 497         if (substream->ops->hw_free)
 498                 result = substream->ops->hw_free(substream);
 499         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 500         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 501                 substream->latency_id);
 502         return result;
 503 }
 504
 505 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 506                              struct snd_pcm_sw_params *params)
 507 {
 508         struct snd_pcm_runtime *runtime;
 509
 510         if (PCM_RUNTIME_CHECK(substream))
 511                 return -ENXIO;
 512         runtime = substream->runtime;
 513         snd_pcm_stream_lock_irq(substream);
 514         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 515                 snd_pcm_stream_unlock_irq(substream);
 516                 return -EBADFD;
 517         }
 518         snd_pcm_stream_unlock_irq(substream);
 519
 520         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 521                 return -EINVAL;
 522         if (params->avail_min == 0)
 523                 return -EINVAL;
 524         if (params->silence_size >= runtime->boundary) {
 525                 if (params->silence_threshold != 0)
 526                         return -EINVAL;
 527         } else {
 528                 if (params->silence_size > params->silence_threshold)
 529                         return -EINVAL;
 530                 if (params->silence_threshold > runtime->buffer_size)
 531                         return -EINVAL;
 532         }
 533         snd_pcm_stream_lock_irq(substream);
 534         runtime->tstamp_mode = params->tstamp_mode;
 535         runtime->period_step = params->period_step;
 536         runtime->control->avail_min = params->avail_min;
 537         runtime->start_threshold = params->start_threshold;
 538         runtime->stop_threshold = params->stop_threshold;
 539         runtime->silence_threshold = params->silence_threshold;
 540         runtime->silence_size = params->silence_size;
 541         params->boundary = runtime->boundary;
 542         if (snd_pcm_running(substream)) {
 543                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 544                     runtime->silence_size > 0)
 545                         snd_pcm_playback_silence(substream, ULONG_MAX);
 546                 wake_up(&runtime->sleep);
 547         }
 548         snd_pcm_stream_unlock_irq(substream);
 549         return 0;
 550 }
 551
 552 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 553                                   struct snd_pcm_sw_params __user * _params)
 554 {
 555         struct snd_pcm_sw_params params;
 556         int err;
 557         if (copy_from_user(&params, _params, sizeof(params)))
 558                 return -EFAULT;
 559         err = snd_pcm_sw_params(substream, &params);
 560         if (copy_to_user(_params, &params, sizeof(params)))
 561                 return -EFAULT;
 562         return err;
 563 }
 564
 565 int snd_pcm_status(struct snd_pcm_substream *substream,
 566                    struct snd_pcm_status *status)
 567 {
 568         struct snd_pcm_runtime *runtime = substream->runtime;
 569
 570         snd_pcm_stream_lock_irq(substream);
 571         status->state = runtime->status->state;
 572         status->suspended_state = runtime->status->suspended_state;
 573         if (status->state == SNDRV_PCM_STATE_OPEN)
 574                 goto _end;
 575         status->trigger_tstamp = runtime->trigger_tstamp;
 576         if (snd_pcm_running(substream)) {
 577                 snd_pcm_update_hw_ptr(substream);
 578                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 579                         status->tstamp = runtime->status->tstamp;
 580                         goto _tstamp_end;
 581                 }
 582         }
 583         snd_pcm_gettime(runtime, &status->tstamp);
 584  _tstamp_end:
 585         status->appl_ptr = runtime->control->appl_ptr;
 586         status->hw_ptr = runtime->status->hw_ptr;
 587         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 588                 status->avail = snd_pcm_playback_avail(runtime);
 589                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 590                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 591                         status->delay = runtime->buffer_size - status->avail;
 592                 else
 593                         status->delay = 0;
 594         } else {
 595                 status->avail = snd_pcm_capture_avail(runtime);
 596                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 597                         status->delay = status->avail;
 598                 else
 599                         status->delay = 0;
 600         }
 601         status->avail_max = runtime->avail_max;
 602         status->overrange = runtime->overrange;
 603         runtime->avail_max = 0;
 604         runtime->overrange = 0;
 605  _end:
 606         snd_pcm_stream_unlock_irq(substream);
 607         return 0;
 608 }
 609
 610 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 611                                struct snd_pcm_status __user * _status)
 612 {
 613         struct snd_pcm_status status;
 614         int res;
 615
 616         memset(&status, 0, sizeof(status));
 617         res = snd_pcm_status(substream, &status);
 618         if (res < 0)
 619                 return res;
 620         if (copy_to_user(_status, &status, sizeof(status)))
 621                 return -EFAULT;
 622         return 0;
 623 }
 624
 625 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 626                                 struct snd_pcm_channel_info * info)
 627 {
 628         struct snd_pcm_runtime *runtime;
 629         unsigned int channel;
 630
 631         channel = info->channel;
 632         runtime = substream->runtime;
 633         snd_pcm_stream_lock_irq(substream);
 634         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 635                 snd_pcm_stream_unlock_irq(substream);
 636                 return -EBADFD;
 637         }
 638         snd_pcm_stream_unlock_irq(substream);
 639         if (channel >= runtime->channels)
 640                 return -EINVAL;
 641         memset(info, 0, sizeof(*info));
 642         info->channel = channel;
 643         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 644 }
 645
 646 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 647                                      struct snd_pcm_channel_info __user * _info)
 648 {
 649         struct snd_pcm_channel_info info;
 650         int res;
 651
 652         if (copy_from_user(&info, _info, sizeof(info)))
 653                 return -EFAULT;
 654         res = snd_pcm_channel_info(substream, &info);
 655         if (res < 0)
 656                 return res;
 657         if (copy_to_user(_info, &info, sizeof(info)))
 658                 return -EFAULT;
 659         return 0;
 660 }
 661
 662 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 663 {
 664         struct snd_pcm_runtime *runtime = substream->runtime;
 665         if (runtime->trigger_master == NULL)
 666                 return;
 667         if (runtime->trigger_master == substream) {
 668                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 669         } else {
 670                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 671                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 672         }
 673         runtime->trigger_master = NULL;
 674 }
 675
 676 struct action_ops {
 677         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 678         int (*do_action)(struct snd_pcm_substream *substream, int state);
 679         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 680         void (*post_action)(struct snd_pcm_substream *substream, int state);
 681 };
 682
 683 /*
 684  *  this functions is core for handling of linked stream
 685  *  Note: the stream state might be changed also on failure
 686  *  Note2: call with calling stream lock + link lock
 687  */
 688 static int snd_pcm_action_group(struct action_ops *ops,
 689                                 struct snd_pcm_substream *substream,
 690                                 int state, int do_lock)
 691 {
 692         struct snd_pcm_substream *s = NULL;
 693         struct snd_pcm_substream *s1;
 694         int res = 0;
 695
 696         snd_pcm_group_for_each_entry(s, substream) {
 697                 if (do_lock && s != substream)
 698                         spin_lock_nested(&s->self_group.lock,
 699                                          SINGLE_DEPTH_NESTING);
 700                 res = ops->pre_action(s, state);
 701                 if (res < 0)
 702                         goto _unlock;
 703         }
 704         snd_pcm_group_for_each_entry(s, substream) {
 705                 res = ops->do_action(s, state);
 706                 if (res < 0) {
 707                         if (ops->undo_action) {
 708                                 snd_pcm_group_for_each_entry(s1, substream) {
 709                                         if (s1 == s) /* failed stream */
 710                                                 break;
 711                                         ops->undo_action(s1, state);
 712                                 }
 713                         }
 714                         s = NULL; /* unlock all */
 715                         goto _unlock;
 716                 }
 717         }
 718         snd_pcm_group_for_each_entry(s, substream) {
 719                 ops->post_action(s, state);
 720         }
 721  _unlock:
 722         if (do_lock) {
 723                 /* unlock streams */
 724                 snd_pcm_group_for_each_entry(s1, substream) {
 725                         if (s1 != substream)
 726                                 spin_unlock(&s1->self_group.lock);
 727                         if (s1 == s)    /* end */
 728                                 break;
 729                 }
 730         }
 731         return res;
 732 }
 733
 734 /*
 735  *  Note: call with stream lock
 736  */
 737 static int snd_pcm_action_single(struct action_ops *ops,
 738                                  struct snd_pcm_substream *substream,
 739                                  int state)
 740 {
 741         int res;
 742
 743         res = ops->pre_action(substream, state);
 744         if (res < 0)
 745                 return res;
 746         res = ops->do_action(substream, state);
 747         if (res == 0)
 748                 ops->post_action(substream, state);
 749         else if (ops->undo_action)
 750                 ops->undo_action(substream, state);
 751         return res;
 752 }
 753
 754 /*
 755  *  Note: call with stream lock
 756  */
 757 static int snd_pcm_action(struct action_ops *ops,
 758                           struct snd_pcm_substream *substream,
 759                           int state)
 760 {
 761         int res;
 762
 763         if (snd_pcm_stream_linked(substream)) {
 764                 if (!spin_trylock(&substream->group->lock)) {
 765                         spin_unlock(&substream->self_group.lock);
 766                         spin_lock(&substream->group->lock);
 767                         spin_lock(&substream->self_group.lock);
 768                 }
 769                 res = snd_pcm_action_group(ops, substream, state, 1);
 770                 spin_unlock(&substream->group->lock);
 771         } else {
 772                 res = snd_pcm_action_single(ops, substream, state);
 773         }
 774         return res;
 775 }
 776
 777 /*
 778  *  Note: don't use any locks before
 779  */
 780 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 781                                    struct snd_pcm_substream *substream,
 782                                    int state)
 783 {
 784         int res;
 785
 786         read_lock_irq(&snd_pcm_link_rwlock);
 787         if (snd_pcm_stream_linked(substream)) {
 788                 spin_lock(&substream->group->lock);
 789                 spin_lock(&substream->self_group.lock);
 790                 res = snd_pcm_action_group(ops, substream, state, 1);
 791                 spin_unlock(&substream->self_group.lock);
 792                 spin_unlock(&substream->group->lock);
 793         } else {
 794                 spin_lock(&substream->self_group.lock);
 795                 res = snd_pcm_action_single(ops, substream, state);
 796                 spin_unlock(&substream->self_group.lock);
 797         }
 798         read_unlock_irq(&snd_pcm_link_rwlock);
 799         return res;
 800 }
 801
 802 /*
 803  */
 804 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 805                                     struct snd_pcm_substream *substream,
 806                                     int state)
 807 {
 808         int res;
 809
 810         down_read(&snd_pcm_link_rwsem);
 811         if (snd_pcm_stream_linked(substream))
 812                 res = snd_pcm_action_group(ops, substream, state, 0);
 813         else
 814                 res = snd_pcm_action_single(ops, substream, state);
 815         up_read(&snd_pcm_link_rwsem);
 816         return res;
 817 }
 818
 819 /*
 820  * start callbacks
 821  */
 822 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 823 {
 824         struct snd_pcm_runtime *runtime = substream->runtime;
 825         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 826                 return -EBADFD;
 827         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 828             !snd_pcm_playback_data(substream))
 829                 return -EPIPE;
 830         runtime->trigger_master = substream;
 831         return 0;
 832 }
 833
 834 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 835 {
 836         if (substream->runtime->trigger_master != substream)
 837                 return 0;
 838         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 839 }
 840
 841 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 842 {
 843         if (substream->runtime->trigger_master == substream)
 844                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 845 }
 846
 847 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 848 {
 849         struct snd_pcm_runtime *runtime = substream->runtime;
 850         snd_pcm_trigger_tstamp(substream);
 851         runtime->hw_ptr_jiffies = jiffies;
 852         runtime->status->state = state;
 853         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 854             runtime->silence_size > 0)
 855                 snd_pcm_playback_silence(substream, ULONG_MAX);
 856         if (substream->timer)
 857                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 858                                  &runtime->trigger_tstamp);
 859 }
 860
 861 static struct action_ops snd_pcm_action_start = {
 862         .pre_action = snd_pcm_pre_start,
 863         .do_action = snd_pcm_do_start,
 864         .undo_action = snd_pcm_undo_start,
 865         .post_action = snd_pcm_post_start
 866 };
 867
 868 /**
 869  * snd_pcm_start - start all linked streams
 870  * @substream: the PCM substream instance
 871  */
 872 int snd_pcm_start(struct snd_pcm_substream *substream)
 873 {
 874         return snd_pcm_action(&snd_pcm_action_start, substream,
 875                               SNDRV_PCM_STATE_RUNNING);
 876 }
 877
 878 /*
 879  * stop callbacks
 880  */
 881 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 882 {
 883         struct snd_pcm_runtime *runtime = substream->runtime;
 884         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 885                 return -EBADFD;
 886         runtime->trigger_master = substream;
 887         return 0;
 888 }
 889
 890 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 891 {
 892         if (substream->runtime->trigger_master == substream &&
 893             snd_pcm_running(substream))
 894                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 895         return 0; /* unconditonally stop all substreams */
 896 }
 897
 898 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 899 {
 900         struct snd_pcm_runtime *runtime = substream->runtime;
 901         if (runtime->status->state != state) {
 902                 snd_pcm_trigger_tstamp(substream);
 903                 if (substream->timer)
 904                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 905                                          &runtime->trigger_tstamp);
 906                 runtime->status->state = state;
 907         }
 908         wake_up(&runtime->sleep);
 909 }
 910
 911 static struct action_ops snd_pcm_action_stop = {
 912         .pre_action = snd_pcm_pre_stop,
 913         .do_action = snd_pcm_do_stop,
 914         .post_action = snd_pcm_post_stop
 915 };
 916
 917 /**
 918  * snd_pcm_stop - try to stop all running streams in the substream group
 919  * @substream: the PCM substream instance
 920  * @state: PCM state after stopping the stream
 921  *
 922  * The state of each stream is then changed to the given state unconditionally.
 923  */
 924 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 925 {
 926         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 927 }
 928
 929 EXPORT_SYMBOL(snd_pcm_stop);
 930
 931 /**
 932  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 933  * @substream: the PCM substream
 934  *
 935  * After stopping, the state is changed to SETUP.
 936  * Unlike snd_pcm_stop(), this affects only the given stream.
 937  */
 938 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 939 {
 940         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 941                                      SNDRV_PCM_STATE_SETUP);
 942 }
 943
 944 /*
 945  * pause callbacks
 946  */
 947 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 948 {
 949         struct snd_pcm_runtime *runtime = substream->runtime;
 950         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 951                 return -ENOSYS;
 952         if (push) {
 953                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 954                         return -EBADFD;
 955         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 956                 return -EBADFD;
 957         runtime->trigger_master = substream;
 958         return 0;
 959 }
 960
 961 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 962 {
 963         if (substream->runtime->trigger_master != substream)
 964                 return 0;
 965         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 966          * a delta betwen the current jiffies, this gives a large enough
 967          * delta, effectively to skip the check once.
 968          */
 969         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
 970         return substream->ops->trigger(substream,
 971                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 972                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 973 }
 974
 975 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 976 {
 977         if (substream->runtime->trigger_master == substream)
 978                 substream->ops->trigger(substream,
 979                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
 980                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 981 }
 982
 983 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
 984 {
 985         struct snd_pcm_runtime *runtime = substream->runtime;
 986         snd_pcm_trigger_tstamp(substream);
 987         if (push) {
 988                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
 989                 if (substream->timer)
 990                         snd_timer_notify(substream->timer,
 991                                          SNDRV_TIMER_EVENT_MPAUSE,
 992                                          &runtime->trigger_tstamp);
 993                 wake_up(&runtime->sleep);
 994         } else {
 995                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
 996                 if (substream->timer)
 997                         snd_timer_notify(substream->timer,
 998                                          SNDRV_TIMER_EVENT_MCONTINUE,
 999                                          &runtime->trigger_tstamp);
1000         }
1001 }
1002
1003 static struct action_ops snd_pcm_action_pause = {
1004         .pre_action = snd_pcm_pre_pause,
1005         .do_action = snd_pcm_do_pause,
1006         .undo_action = snd_pcm_undo_pause,
1007         .post_action = snd_pcm_post_pause
1008 };
1009
1010 /*
1011  * Push/release the pause for all linked streams.
1012  */
1013 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1014 {
1015         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1016 }
1017
1018 #ifdef CONFIG_PM
1019 /* suspend */
1020
1021 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1022 {
1023         struct snd_pcm_runtime *runtime = substream->runtime;
1024         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1025                 return -EBUSY;
1026         runtime->trigger_master = substream;
1027         return 0;
1028 }
1029
1030 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1031 {
1032         struct snd_pcm_runtime *runtime = substream->runtime;
1033         if (runtime->trigger_master != substream)
1034                 return 0;
1035         if (! snd_pcm_running(substream))
1036                 return 0;
1037         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1038         return 0; /* suspend unconditionally */
1039 }
1040
1041 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1042 {
1043         struct snd_pcm_runtime *runtime = substream->runtime;
1044         snd_pcm_trigger_tstamp(substream);
1045         if (substream->timer)
1046                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1047                                  &runtime->trigger_tstamp);
1048         runtime->status->suspended_state = runtime->status->state;
1049         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1050         wake_up(&runtime->sleep);
1051 }
1052
1053 static struct action_ops snd_pcm_action_suspend = {
1054         .pre_action = snd_pcm_pre_suspend,
1055         .do_action = snd_pcm_do_suspend,
1056         .post_action = snd_pcm_post_suspend
1057 };
1058
1059 /**
1060  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1061  * @substream: the PCM substream
1062  *
1063  * After this call, all streams are changed to SUSPENDED state.
1064  */
1065 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1066 {
1067         int err;
1068         unsigned long flags;
1069
1070         if (! substream)
1071                 return 0;
1072
1073         snd_pcm_stream_lock_irqsave(substream, flags);
1074         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1075         snd_pcm_stream_unlock_irqrestore(substream, flags);
1076         return err;
1077 }
1078
1079 EXPORT_SYMBOL(snd_pcm_suspend);
1080
1081 /**
1082  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1083  * @pcm: the PCM instance
1084  *
1085  * After this call, all streams are changed to SUSPENDED state.
1086  */
1087 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1088 {
1089         struct snd_pcm_substream *substream;
1090         int stream, err = 0;
1091
1092         if (! pcm)
1093                 return 0;
1094
1095         for (stream = 0; stream < 2; stream++) {
1096                 for (substream = pcm->streams[stream].substream;
1097                      substream; substream = substream->next) {
1098                         /* FIXME: the open/close code should lock this as well */
1099                         if (substream->runtime == NULL)
1100                                 continue;
1101                         err = snd_pcm_suspend(substream);
1102                         if (err < 0 && err != -EBUSY)
1103                                 return err;
1104                 }
1105         }
1106         return 0;
1107 }
1108
1109 EXPORT_SYMBOL(snd_pcm_suspend_all);
1110
1111 /* resume */
1112
1113 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1114 {
1115         struct snd_pcm_runtime *runtime = substream->runtime;
1116         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1117                 return -ENOSYS;
1118         runtime->trigger_master = substream;
1119         return 0;
1120 }
1121
1122 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1123 {
1124         struct snd_pcm_runtime *runtime = substream->runtime;
1125         if (runtime->trigger_master != substream)
1126                 return 0;
1127         /* DMA not running previously? */
1128         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1129             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1130              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1131                 return 0;
1132         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1133 }
1134
1135 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1136 {
1137         if (substream->runtime->trigger_master == substream &&
1138             snd_pcm_running(substream))
1139                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1140 }
1141
1142 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1143 {
1144         struct snd_pcm_runtime *runtime = substream->runtime;
1145         snd_pcm_trigger_tstamp(substream);
1146         if (substream->timer)
1147                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1148                                  &runtime->trigger_tstamp);
1149         runtime->status->state = runtime->status->suspended_state;
1150 }
1151
1152 static struct action_ops snd_pcm_action_resume = {
1153         .pre_action = snd_pcm_pre_resume,
1154         .do_action = snd_pcm_do_resume,
1155         .undo_action = snd_pcm_undo_resume,
1156         .post_action = snd_pcm_post_resume
1157 };
1158
1159 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1160 {
1161         struct snd_card *card = substream->pcm->card;
1162         int res;
1163
1164         snd_power_lock(card);
1165         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1166                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1167         snd_power_unlock(card);
1168         return res;
1169 }
1170
1171 #else
1172
1173 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1174 {
1175         return -ENOSYS;
1176 }
1177
1178 #endif /* CONFIG_PM */
1179
1180 /*
1181  * xrun ioctl
1182  *
1183  * Change the RUNNING stream(s) to XRUN state.
1184  */
1185 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1186 {
1187         struct snd_card *card = substream->pcm->card;
1188         struct snd_pcm_runtime *runtime = substream->runtime;
1189         int result;
1190
1191         snd_power_lock(card);
1192         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1193                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1194                 if (result < 0)
1195                         goto _unlock;
1196         }
1197
1198         snd_pcm_stream_lock_irq(substream);
1199         switch (runtime->status->state) {
1200         case SNDRV_PCM_STATE_XRUN:
1201                 result = 0;     /* already there */
1202                 break;
1203         case SNDRV_PCM_STATE_RUNNING:
1204                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1205                 break;
1206         default:
1207                 result = -EBADFD;
1208         }
1209         snd_pcm_stream_unlock_irq(substream);
1210  _unlock:
1211         snd_power_unlock(card);
1212         return result;
1213 }
1214
1215 /*
1216  * reset ioctl
1217  */
1218 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1219 {
1220         struct snd_pcm_runtime *runtime = substream->runtime;
1221         switch (runtime->status->state) {
1222         case SNDRV_PCM_STATE_RUNNING:
1223         case SNDRV_PCM_STATE_PREPARED:
1224         case SNDRV_PCM_STATE_PAUSED:
1225         case SNDRV_PCM_STATE_SUSPENDED:
1226                 return 0;
1227         default:
1228                 return -EBADFD;
1229         }
1230 }
1231
1232 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1233 {
1234         struct snd_pcm_runtime *runtime = substream->runtime;
1235         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1236         if (err < 0)
1237                 return err;
1238         runtime->hw_ptr_base = 0;
1239         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1240                 runtime->status->hw_ptr % runtime->period_size;
1241         runtime->silence_start = runtime->status->hw_ptr;
1242         runtime->silence_filled = 0;
1243         return 0;
1244 }
1245
1246 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1247 {
1248         struct snd_pcm_runtime *runtime = substream->runtime;
1249         runtime->control->appl_ptr = runtime->status->hw_ptr;
1250         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1251             runtime->silence_size > 0)
1252                 snd_pcm_playback_silence(substream, ULONG_MAX);
1253 }
1254
1255 static struct action_ops snd_pcm_action_reset = {
1256         .pre_action = snd_pcm_pre_reset,
1257         .do_action = snd_pcm_do_reset,
1258         .post_action = snd_pcm_post_reset
1259 };
1260
1261 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1262 {
1263         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1264 }
1265
1266 /*
1267  * prepare ioctl
1268  */
1269 /* we use the second argument for updating f_flags */
1270 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1271                                int f_flags)
1272 {
1273         struct snd_pcm_runtime *runtime = substream->runtime;
1274         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1275             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1276                 return -EBADFD;
1277         if (snd_pcm_running(substream))
1278                 return -EBUSY;
1279         substream->f_flags = f_flags;
1280         return 0;
1281 }
1282
1283 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1284 {
1285         int err;
1286         err = substream->ops->prepare(substream);
1287         if (err < 0)
1288                 return err;
1289         return snd_pcm_do_reset(substream, 0);
1290 }
1291
1292 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1293 {
1294         struct snd_pcm_runtime *runtime = substream->runtime;
1295         runtime->control->appl_ptr = runtime->status->hw_ptr;
1296         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1297 }
1298
1299 static struct action_ops snd_pcm_action_prepare = {
1300         .pre_action = snd_pcm_pre_prepare,
1301         .do_action = snd_pcm_do_prepare,
1302         .post_action = snd_pcm_post_prepare
1303 };
1304
1305 /**
1306  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1307  * @substream: the PCM substream instance
1308  * @file: file to refer f_flags
1309  */
1310 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1311                            struct file *file)
1312 {
1313         int res;
1314         struct snd_card *card = substream->pcm->card;
1315         int f_flags;
1316
1317         if (file)
1318                 f_flags = file->f_flags;
1319         else
1320                 f_flags = substream->f_flags;
1321
1322         snd_power_lock(card);
1323         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1324                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1325                                                substream, f_flags);
1326         snd_power_unlock(card);
1327         return res;
1328 }
1329
1330 /*
1331  * drain ioctl
1332  */
1333
1334 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1335 {
1336         if (substream->f_flags & O_NONBLOCK)
1337                 return -EAGAIN;
1338         substream->runtime->trigger_master = substream;
1339         return 0;
1340 }
1341
1342 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1343 {
1344         struct snd_pcm_runtime *runtime = substream->runtime;
1345         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1346                 switch (runtime->status->state) {
1347                 case SNDRV_PCM_STATE_PREPARED:
1348                         /* start playback stream if possible */
1349                         if (! snd_pcm_playback_empty(substream)) {
1350                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1351                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1352                         }
1353                         break;
1354                 case SNDRV_PCM_STATE_RUNNING:
1355                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1356                         break;
1357                 default:
1358                         break;
1359                 }
1360         } else {
1361                 /* stop running stream */
1362                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1363                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1364                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1365                         snd_pcm_do_stop(substream, new_state);
1366                         snd_pcm_post_stop(substream, new_state);
1367                 }
1368         }
1369         return 0;
1370 }
1371
1372 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1373 {
1374 }
1375
1376 static struct action_ops snd_pcm_action_drain_init = {
1377         .pre_action = snd_pcm_pre_drain_init,
1378         .do_action = snd_pcm_do_drain_init,
1379         .post_action = snd_pcm_post_drain_init
1380 };
1381
1382 struct drain_rec {
1383         struct snd_pcm_substream *substream;
1384         wait_queue_t wait;
1385         snd_pcm_uframes_t stop_threshold;
1386 };
1387
1388 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1389
1390 /*
1391  * Drain the stream(s).
1392  * When the substream is linked, sync until the draining of all playback streams
1393  * is finished.
1394  * After this call, all streams are supposed to be either SETUP or DRAINING
1395  * (capture only) state.
1396  */
1397 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1398 {
1399         struct snd_card *card;
1400         struct snd_pcm_runtime *runtime;
1401         struct snd_pcm_substream *s;
1402         int result = 0;
1403         int i, num_drecs;
1404         struct drain_rec *drec, drec_tmp, *d;
1405
1406         card = substream->pcm->card;
1407         runtime = substream->runtime;
1408
1409         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1410                 return -EBADFD;
1411
1412         snd_power_lock(card);
1413         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1414                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1415                 if (result < 0) {
1416                         snd_power_unlock(card);
1417                         return result;
1418                 }
1419         }
1420
1421         /* allocate temporary record for drain sync */
1422         down_read(&snd_pcm_link_rwsem);
1423         if (snd_pcm_stream_linked(substream)) {
1424                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1425                 if (! drec) {
1426                         up_read(&snd_pcm_link_rwsem);
1427                         snd_power_unlock(card);
1428                         return -ENOMEM;
1429                 }
1430         } else
1431                 drec = &drec_tmp;
1432
1433         /* count only playback streams */
1434         num_drecs = 0;
1435         snd_pcm_group_for_each_entry(s, substream) {
1436                 runtime = s->runtime;
1437                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1438                         d = &drec[num_drecs++];
1439                         d->substream = s;
1440                         init_waitqueue_entry(&d->wait, current);
1441                         add_wait_queue(&runtime->sleep, &d->wait);
1442                         /* stop_threshold fixup to avoid endless loop when
1443                          * stop_threshold > buffer_size
1444                          */
1445                         d->stop_threshold = runtime->stop_threshold;
1446                         if (runtime->stop_threshold > runtime->buffer_size)
1447                                 runtime->stop_threshold = runtime->buffer_size;
1448                 }
1449         }
1450         up_read(&snd_pcm_link_rwsem);
1451
1452         snd_pcm_stream_lock_irq(substream);
1453         /* resume pause */
1454         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1455                 snd_pcm_pause(substream, 0);
1456
1457         /* pre-start/stop - all running streams are changed to DRAINING state */
1458         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1459         if (result < 0) {
1460                 snd_pcm_stream_unlock_irq(substream);
1461                 goto _error;
1462         }
1463
1464         for (;;) {
1465                 long tout;
1466                 if (signal_pending(current)) {
1467                         result = -ERESTARTSYS;
1468                         break;
1469                 }
1470                 /* all finished? */
1471                 for (i = 0; i < num_drecs; i++) {
1472                         runtime = drec[i].substream->runtime;
1473                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1474                                 break;
1475                 }
1476                 if (i == num_drecs)
1477                         break; /* yes, all drained */
1478
1479                 set_current_state(TASK_INTERRUPTIBLE);
1480                 snd_pcm_stream_unlock_irq(substream);
1481                 snd_power_unlock(card);
1482                 tout = schedule_timeout(10 * HZ);
1483                 snd_power_lock(card);
1484                 snd_pcm_stream_lock_irq(substream);
1485                 if (tout == 0) {
1486                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1487                                 result = -ESTRPIPE;
1488                         else {
1489                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1490                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1491                                 result = -EIO;
1492                         }
1493                         break;
1494                 }
1495         }
1496
1497         snd_pcm_stream_unlock_irq(substream);
1498
1499  _error:
1500         for (i = 0; i < num_drecs; i++) {
1501                 d = &drec[i];
1502                 runtime = d->substream->runtime;
1503                 remove_wait_queue(&runtime->sleep, &d->wait);
1504                 runtime->stop_threshold = d->stop_threshold;
1505         }
1506
1507         if (drec != &drec_tmp)
1508                 kfree(drec);
1509         snd_power_unlock(card);
1510
1511         return result;
1512 }
1513
1514 /*
1515  * drop ioctl
1516  *
1517  * Immediately put all linked substreams into SETUP state.
1518  */
1519 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1520 {
1521         struct snd_pcm_runtime *runtime;
1522         struct snd_card *card;
1523         int result = 0;
1524
1525         if (PCM_RUNTIME_CHECK(substream))
1526                 return -ENXIO;
1527         runtime = substream->runtime;
1528         card = substream->pcm->card;
1529
1530         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1531             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1532             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1533                 return -EBADFD;
1534
1535         snd_pcm_stream_lock_irq(substream);
1536         /* resume pause */
1537         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1538                 snd_pcm_pause(substream, 0);
1539
1540         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1541         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1542         snd_pcm_stream_unlock_irq(substream);
1543
1544         return result;
1545 }
1546
1547
1548 /* WARNING: Don't forget to fput back the file */
1549 static struct file *snd_pcm_file_fd(int fd)
1550 {
1551         struct file *file;
1552         struct inode *inode;
1553         unsigned int minor;
1554
1555         file = fget(fd);
1556         if (!file)
1557                 return NULL;
1558         inode = file->f_path.dentry->d_inode;
1559         if (!S_ISCHR(inode->i_mode) ||
1560             imajor(inode) != snd_major) {
1561                 fput(file);
1562                 return NULL;
1563         }
1564         minor = iminor(inode);
1565         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1566             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1567                 fput(file);
1568                 return NULL;
1569         }
1570         return file;
1571 }
1572
1573 /*
1574  * PCM link handling
1575  */
1576 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1577 {
1578         int res = 0;
1579         struct file *file;
1580         struct snd_pcm_file *pcm_file;
1581         struct snd_pcm_substream *substream1;
1582
1583         file = snd_pcm_file_fd(fd);
1584         if (!file)
1585                 return -EBADFD;
1586         pcm_file = file->private_data;
1587         substream1 = pcm_file->substream;
1588         down_write(&snd_pcm_link_rwsem);
1589         write_lock_irq(&snd_pcm_link_rwlock);
1590         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1591             substream->runtime->status->state != substream1->runtime->status->state) {
1592                 res = -EBADFD;
1593                 goto _end;
1594         }
1595         if (snd_pcm_stream_linked(substream1)) {
1596                 res = -EALREADY;
1597                 goto _end;
1598         }
1599         if (!snd_pcm_stream_linked(substream)) {
1600                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1601                 if (substream->group == NULL) {
1602                         res = -ENOMEM;
1603                         goto _end;
1604                 }
1605                 spin_lock_init(&substream->group->lock);
1606                 INIT_LIST_HEAD(&substream->group->substreams);
1607                 list_add_tail(&substream->link_list, &substream->group->substreams);
1608                 substream->group->count = 1;
1609         }
1610         list_add_tail(&substream1->link_list, &substream->group->substreams);
1611         substream->group->count++;
1612         substream1->group = substream->group;
1613  _end:
1614         write_unlock_irq(&snd_pcm_link_rwlock);
1615         up_write(&snd_pcm_link_rwsem);
1616         fput(file);
1617         return res;
1618 }
1619
1620 static void relink_to_local(struct snd_pcm_substream *substream)
1621 {
1622         substream->group = &substream->self_group;
1623         INIT_LIST_HEAD(&substream->self_group.substreams);
1624         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1625 }
1626
1627 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1628 {
1629         struct snd_pcm_substream *s;
1630         int res = 0;
1631
1632         down_write(&snd_pcm_link_rwsem);
1633         write_lock_irq(&snd_pcm_link_rwlock);
1634         if (!snd_pcm_stream_linked(substream)) {
1635                 res = -EALREADY;
1636                 goto _end;
1637         }
1638         list_del(&substream->link_list);
1639         substream->group->count--;
1640         if (substream->group->count == 1) {     /* detach the last stream, too */
1641                 snd_pcm_group_for_each_entry(s, substream) {
1642                         relink_to_local(s);
1643                         break;
1644                 }
1645                 kfree(substream->group);
1646         }
1647         relink_to_local(substream);
1648        _end:
1649         write_unlock_irq(&snd_pcm_link_rwlock);
1650         up_write(&snd_pcm_link_rwsem);
1651         return res;
1652 }
1653
1654 /*
1655  * hw configurator
1656  */
1657 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1658                                struct snd_pcm_hw_rule *rule)
1659 {
1660         struct snd_interval t;
1661         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1662                      hw_param_interval_c(params, rule->deps[1]), &t);
1663         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1664 }
1665
1666 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1667                                struct snd_pcm_hw_rule *rule)
1668 {
1669         struct snd_interval t;
1670         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1671                      hw_param_interval_c(params, rule->deps[1]), &t);
1672         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1673 }
1674
1675 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1676                                    struct snd_pcm_hw_rule *rule)
1677 {
1678         struct snd_interval t;
1679         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1680                          hw_param_interval_c(params, rule->deps[1]),
1681                          (unsigned long) rule->private, &t);
1682         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1683 }
1684
1685 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1686                                    struct snd_pcm_hw_rule *rule)
1687 {
1688         struct snd_interval t;
1689         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1690                          (unsigned long) rule->private,
1691                          hw_param_interval_c(params, rule->deps[1]), &t);
1692         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1693 }
1694
1695 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1696                                   struct snd_pcm_hw_rule *rule)
1697 {
1698         unsigned int k;
1699         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1700         struct snd_mask m;
1701         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1702         snd_mask_any(&m);
1703         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1704                 int bits;
1705                 if (! snd_mask_test(mask, k))
1706                         continue;
1707                 bits = snd_pcm_format_physical_width(k);
1708                 if (bits <= 0)
1709                         continue; /* ignore invalid formats */
1710                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1711                         snd_mask_reset(&m, k);
1712         }
1713         return snd_mask_refine(mask, &m);
1714 }
1715
1716 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1717                                        struct snd_pcm_hw_rule *rule)
1718 {
1719         struct snd_interval t;
1720         unsigned int k;
1721         t.min = UINT_MAX;
1722         t.max = 0;
1723         t.openmin = 0;
1724         t.openmax = 0;
1725         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1726                 int bits;
1727                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1728                         continue;
1729                 bits = snd_pcm_format_physical_width(k);
1730                 if (bits <= 0)
1731                         continue; /* ignore invalid formats */
1732                 if (t.min > (unsigned)bits)
1733                         t.min = bits;
1734                 if (t.max < (unsigned)bits)
1735                         t.max = bits;
1736         }
1737         t.integer = 1;
1738         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1739 }
1740
1741 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1742 #error "Change this table"
1743 #endif
1744
1745 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1746                                  48000, 64000, 88200, 96000, 176400, 192000 };
1747
1748 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1749         .count = ARRAY_SIZE(rates),
1750         .list = rates,
1751 };
1752
1753 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1754                                 struct snd_pcm_hw_rule *rule)
1755 {
1756         struct snd_pcm_hardware *hw = rule->private;
1757         return snd_interval_list(hw_param_interval(params, rule->var),
1758                                  snd_pcm_known_rates.count,
1759                                  snd_pcm_known_rates.list, hw->rates);
1760 }
1761
1762 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1763                                             struct snd_pcm_hw_rule *rule)
1764 {
1765         struct snd_interval t;
1766         struct snd_pcm_substream *substream = rule->private;
1767         t.min = 0;
1768         t.max = substream->buffer_bytes_max;
1769         t.openmin = 0;
1770         t.openmax = 0;
1771         t.integer = 1;
1772         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1773 }
1774
1775 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1776 {
1777         struct snd_pcm_runtime *runtime = substream->runtime;
1778         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1779         int k, err;
1780
1781         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1782                 snd_mask_any(constrs_mask(constrs, k));
1783         }
1784
1785         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1786                 snd_interval_any(constrs_interval(constrs, k));
1787         }
1788
1789         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1790         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1791         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1792         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1793         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1794
1795         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1796                                    snd_pcm_hw_rule_format, NULL,
1797                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1798         if (err < 0)
1799                 return err;
1800         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1801                                   snd_pcm_hw_rule_sample_bits, NULL,
1802                                   SNDRV_PCM_HW_PARAM_FORMAT,
1803                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1804         if (err < 0)
1805                 return err;
1806         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1807                                   snd_pcm_hw_rule_div, NULL,
1808                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1809         if (err < 0)
1810                 return err;
1811         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1812                                   snd_pcm_hw_rule_mul, NULL,
1813                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1814         if (err < 0)
1815                 return err;
1816         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1817                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1818                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1819         if (err < 0)
1820                 return err;
1821         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1822                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1823                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1824         if (err < 0)
1825                 return err;
1826         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1827                                   snd_pcm_hw_rule_div, NULL,
1828                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, 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_RATE,
1832                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1833                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1834         if (err < 0)
1835                 return err;
1836         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1837                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1838                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1842                                   snd_pcm_hw_rule_div, NULL,
1843                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 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_PERIOD_SIZE,
1847                                   snd_pcm_hw_rule_div, NULL,
1848                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1852                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1853                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1857                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1858                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1862                                   snd_pcm_hw_rule_mul, NULL,
1863                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1867                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1868                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1869         if (err < 0)
1870                 return err;
1871         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1872                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1873                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1877                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1878                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 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_BUFFER_BYTES,
1882                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1883                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1884         if (err < 0)
1885                 return err;
1886         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1887                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1888                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1889         if (err < 0)
1890                 return err;
1891         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1892                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1893                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1894         if (err < 0)
1895                 return err;
1896         return 0;
1897 }
1898
1899 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1900 {
1901         struct snd_pcm_runtime *runtime = substream->runtime;
1902         struct snd_pcm_hardware *hw = &runtime->hw;
1903         int err;
1904         unsigned int mask = 0;
1905
1906         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1907                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1908         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1909                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1910         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1911                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1912                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1913                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1914                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1915                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1916                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1917         }
1918         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1919         if (err < 0)
1920                 return err;
1921
1922         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1923         if (err < 0)
1924                 return err;
1925
1926         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1927         if (err < 0)
1928                 return err;
1929
1930         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1931                                            hw->channels_min, hw->channels_max);
1932         if (err < 0)
1933                 return err;
1934
1935         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1936                                            hw->rate_min, hw->rate_max);
1937          if (err < 0)
1938                  return err;
1939
1940         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1941                                            hw->period_bytes_min, hw->period_bytes_max);
1942          if (err < 0)
1943                  return err;
1944
1945         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1946                                            hw->periods_min, hw->periods_max);
1947         if (err < 0)
1948                 return err;
1949
1950         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1951                                            hw->period_bytes_min, hw->buffer_bytes_max);
1952         if (err < 0)
1953                 return err;
1954
1955         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1956                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1957                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1958         if (err < 0)
1959                 return err;
1960
1961         /* FIXME: remove */
1962         if (runtime->dma_bytes) {
1963                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1964                 if (err < 0)
1965                         return -EINVAL;
1966         }
1967
1968         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1969                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1970                                           snd_pcm_hw_rule_rate, hw,
1971                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1972                 if (err < 0)
1973                         return err;
1974         }
1975
1976         /* FIXME: this belong to lowlevel */
1977         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1978
1979         return 0;
1980 }
1981
1982 static void pcm_release_private(struct snd_pcm_substream *substream)
1983 {
1984         snd_pcm_unlink(substream);
1985 }
1986
1987 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
1988 {
1989         substream->ref_count--;
1990         if (substream->ref_count > 0)
1991                 return;
1992
1993         snd_pcm_drop(substream);
1994         if (substream->hw_opened) {
1995                 if (substream->ops->hw_free != NULL)
1996                         substream->ops->hw_free(substream);
1997                 substream->ops->close(substream);
1998                 substream->hw_opened = 0;
1999         }
2000         if (substream->pcm_release) {
2001                 substream->pcm_release(substream);
2002                 substream->pcm_release = NULL;
2003         }
2004         snd_pcm_detach_substream(substream);
2005 }
2006
2007 EXPORT_SYMBOL(snd_pcm_release_substream);
2008
2009 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2010                            struct file *file,
2011                            struct snd_pcm_substream **rsubstream)
2012 {
2013         struct snd_pcm_substream *substream;
2014         int err;
2015
2016         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2017         if (err < 0)
2018                 return err;
2019         if (substream->ref_count > 1) {
2020                 *rsubstream = substream;
2021                 return 0;
2022         }
2023
2024         err = snd_pcm_hw_constraints_init(substream);
2025         if (err < 0) {
2026                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2027                 goto error;
2028         }
2029
2030         if ((err = substream->ops->open(substream)) < 0)
2031                 goto error;
2032
2033         substream->hw_opened = 1;
2034
2035         err = snd_pcm_hw_constraints_complete(substream);
2036         if (err < 0) {
2037                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2038                 goto error;
2039         }
2040
2041         *rsubstream = substream;
2042         return 0;
2043
2044  error:
2045         snd_pcm_release_substream(substream);
2046         return err;
2047 }
2048
2049 EXPORT_SYMBOL(snd_pcm_open_substream);
2050
2051 static int snd_pcm_open_file(struct file *file,
2052                              struct snd_pcm *pcm,
2053                              int stream,
2054                              struct snd_pcm_file **rpcm_file)
2055 {
2056         struct snd_pcm_file *pcm_file;
2057         struct snd_pcm_substream *substream;
2058         struct snd_pcm_str *str;
2059         int err;
2060
2061         if (rpcm_file)
2062                 *rpcm_file = NULL;
2063
2064         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2065         if (err < 0)
2066                 return err;
2067
2068         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2069         if (pcm_file == NULL) {
2070                 snd_pcm_release_substream(substream);
2071                 return -ENOMEM;
2072         }
2073         pcm_file->substream = substream;
2074         if (substream->ref_count == 1) {
2075                 str = substream->pstr;
2076                 substream->file = pcm_file;
2077                 substream->pcm_release = pcm_release_private;
2078         }
2079         file->private_data = pcm_file;
2080         if (rpcm_file)
2081                 *rpcm_file = pcm_file;
2082         return 0;
2083 }
2084
2085 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2086 {
2087         struct snd_pcm *pcm;
2088
2089         pcm = snd_lookup_minor_data(iminor(inode),
2090                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2091         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2092 }
2093
2094 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2095 {
2096         struct snd_pcm *pcm;
2097
2098         pcm = snd_lookup_minor_data(iminor(inode),
2099                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2100         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2101 }
2102
2103 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2104 {
2105         int err;
2106         struct snd_pcm_file *pcm_file;
2107         wait_queue_t wait;
2108
2109         if (pcm == NULL) {
2110                 err = -ENODEV;
2111                 goto __error1;
2112         }
2113         err = snd_card_file_add(pcm->card, file);
2114         if (err < 0)
2115                 goto __error1;
2116         if (!try_module_get(pcm->card->module)) {
2117                 err = -EFAULT;
2118                 goto __error2;
2119         }
2120         init_waitqueue_entry(&wait, current);
2121         add_wait_queue(&pcm->open_wait, &wait);
2122         mutex_lock(&pcm->open_mutex);
2123         while (1) {
2124                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2125                 if (err >= 0)
2126                         break;
2127                 if (err == -EAGAIN) {
2128                         if (file->f_flags & O_NONBLOCK) {
2129                                 err = -EBUSY;
2130                                 break;
2131                         }
2132                 } else
2133                         break;
2134                 set_current_state(TASK_INTERRUPTIBLE);
2135                 mutex_unlock(&pcm->open_mutex);
2136                 schedule();
2137                 mutex_lock(&pcm->open_mutex);
2138                 if (signal_pending(current)) {
2139                         err = -ERESTARTSYS;
2140                         break;
2141                 }
2142         }
2143         remove_wait_queue(&pcm->open_wait, &wait);
2144         mutex_unlock(&pcm->open_mutex);
2145         if (err < 0)
2146                 goto __error;
2147         return err;
2148
2149       __error:
2150         module_put(pcm->card->module);
2151       __error2:
2152         snd_card_file_remove(pcm->card, file);
2153       __error1:
2154         return err;
2155 }
2156
2157 static int snd_pcm_release(struct inode *inode, struct file *file)
2158 {
2159         struct snd_pcm *pcm;
2160         struct snd_pcm_substream *substream;
2161         struct snd_pcm_file *pcm_file;
2162
2163         pcm_file = file->private_data;
2164         substream = pcm_file->substream;
2165         if (snd_BUG_ON(!substream))
2166                 return -ENXIO;
2167         pcm = substream->pcm;
2168         mutex_lock(&pcm->open_mutex);
2169         snd_pcm_release_substream(substream);
2170         kfree(pcm_file);
2171         mutex_unlock(&pcm->open_mutex);
2172         wake_up(&pcm->open_wait);
2173         module_put(pcm->card->module);
2174         snd_card_file_remove(pcm->card, file);
2175         return 0;
2176 }
2177
2178 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2179                                                  snd_pcm_uframes_t frames)
2180 {
2181         struct snd_pcm_runtime *runtime = substream->runtime;
2182         snd_pcm_sframes_t appl_ptr;
2183         snd_pcm_sframes_t ret;
2184         snd_pcm_sframes_t hw_avail;
2185
2186         if (frames == 0)
2187                 return 0;
2188
2189         snd_pcm_stream_lock_irq(substream);
2190         switch (runtime->status->state) {
2191         case SNDRV_PCM_STATE_PREPARED:
2192                 break;
2193         case SNDRV_PCM_STATE_DRAINING:
2194         case SNDRV_PCM_STATE_RUNNING:
2195                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2196                         break;
2197                 /* Fall through */
2198         case SNDRV_PCM_STATE_XRUN:
2199                 ret = -EPIPE;
2200                 goto __end;
2201         default:
2202                 ret = -EBADFD;
2203                 goto __end;
2204         }
2205
2206         hw_avail = snd_pcm_playback_hw_avail(runtime);
2207         if (hw_avail <= 0) {
2208                 ret = 0;
2209                 goto __end;
2210         }
2211         if (frames > (snd_pcm_uframes_t)hw_avail)
2212                 frames = hw_avail;
2213         appl_ptr = runtime->control->appl_ptr - frames;
2214         if (appl_ptr < 0)
2215                 appl_ptr += runtime->boundary;
2216         runtime->control->appl_ptr = appl_ptr;
2217         ret = frames;
2218  __end:
2219         snd_pcm_stream_unlock_irq(substream);
2220         return ret;
2221 }
2222
2223 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2224                                                 snd_pcm_uframes_t frames)
2225 {
2226         struct snd_pcm_runtime *runtime = substream->runtime;
2227         snd_pcm_sframes_t appl_ptr;
2228         snd_pcm_sframes_t ret;
2229         snd_pcm_sframes_t hw_avail;
2230
2231         if (frames == 0)
2232                 return 0;
2233
2234         snd_pcm_stream_lock_irq(substream);
2235         switch (runtime->status->state) {
2236         case SNDRV_PCM_STATE_PREPARED:
2237         case SNDRV_PCM_STATE_DRAINING:
2238                 break;
2239         case SNDRV_PCM_STATE_RUNNING:
2240                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2241                         break;
2242                 /* Fall through */
2243         case SNDRV_PCM_STATE_XRUN:
2244                 ret = -EPIPE;
2245                 goto __end;
2246         default:
2247                 ret = -EBADFD;
2248                 goto __end;
2249         }
2250
2251         hw_avail = snd_pcm_capture_hw_avail(runtime);
2252         if (hw_avail <= 0) {
2253                 ret = 0;
2254                 goto __end;
2255         }
2256         if (frames > (snd_pcm_uframes_t)hw_avail)
2257                 frames = hw_avail;
2258         appl_ptr = runtime->control->appl_ptr - frames;
2259         if (appl_ptr < 0)
2260                 appl_ptr += runtime->boundary;
2261         runtime->control->appl_ptr = appl_ptr;
2262         ret = frames;
2263  __end:
2264         snd_pcm_stream_unlock_irq(substream);
2265         return ret;
2266 }
2267
2268 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2269                                                   snd_pcm_uframes_t frames)
2270 {
2271         struct snd_pcm_runtime *runtime = substream->runtime;
2272         snd_pcm_sframes_t appl_ptr;
2273         snd_pcm_sframes_t ret;
2274         snd_pcm_sframes_t avail;
2275
2276         if (frames == 0)
2277                 return 0;
2278
2279         snd_pcm_stream_lock_irq(substream);
2280         switch (runtime->status->state) {
2281         case SNDRV_PCM_STATE_PREPARED:
2282         case SNDRV_PCM_STATE_PAUSED:
2283                 break;
2284         case SNDRV_PCM_STATE_DRAINING:
2285         case SNDRV_PCM_STATE_RUNNING:
2286                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2287                         break;
2288                 /* Fall through */
2289         case SNDRV_PCM_STATE_XRUN:
2290                 ret = -EPIPE;
2291                 goto __end;
2292         default:
2293                 ret = -EBADFD;
2294                 goto __end;
2295         }
2296
2297         avail = snd_pcm_playback_avail(runtime);
2298         if (avail <= 0) {
2299                 ret = 0;
2300                 goto __end;
2301         }
2302         if (frames > (snd_pcm_uframes_t)avail)
2303                 frames = avail;
2304         appl_ptr = runtime->control->appl_ptr + frames;
2305         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2306                 appl_ptr -= runtime->boundary;
2307         runtime->control->appl_ptr = appl_ptr;
2308         ret = frames;
2309  __end:
2310         snd_pcm_stream_unlock_irq(substream);
2311         return ret;
2312 }
2313
2314 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2315                                                  snd_pcm_uframes_t frames)
2316 {
2317         struct snd_pcm_runtime *runtime = substream->runtime;
2318         snd_pcm_sframes_t appl_ptr;
2319         snd_pcm_sframes_t ret;
2320         snd_pcm_sframes_t avail;
2321
2322         if (frames == 0)
2323                 return 0;
2324
2325         snd_pcm_stream_lock_irq(substream);
2326         switch (runtime->status->state) {
2327         case SNDRV_PCM_STATE_PREPARED:
2328         case SNDRV_PCM_STATE_DRAINING:
2329         case SNDRV_PCM_STATE_PAUSED:
2330                 break;
2331         case SNDRV_PCM_STATE_RUNNING:
2332                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2333                         break;
2334                 /* Fall through */
2335         case SNDRV_PCM_STATE_XRUN:
2336                 ret = -EPIPE;
2337                 goto __end;
2338         default:
2339                 ret = -EBADFD;
2340                 goto __end;
2341         }
2342
2343         avail = snd_pcm_capture_avail(runtime);
2344         if (avail <= 0) {
2345                 ret = 0;
2346                 goto __end;
2347         }
2348         if (frames > (snd_pcm_uframes_t)avail)
2349                 frames = avail;
2350         appl_ptr = runtime->control->appl_ptr + frames;
2351         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2352                 appl_ptr -= runtime->boundary;
2353         runtime->control->appl_ptr = appl_ptr;
2354         ret = frames;
2355  __end:
2356         snd_pcm_stream_unlock_irq(substream);
2357         return ret;
2358 }
2359
2360 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2361 {
2362         struct snd_pcm_runtime *runtime = substream->runtime;
2363         int err;
2364
2365         snd_pcm_stream_lock_irq(substream);
2366         switch (runtime->status->state) {
2367         case SNDRV_PCM_STATE_DRAINING:
2368                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2369                         goto __badfd;
2370         case SNDRV_PCM_STATE_RUNNING:
2371                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2372                         break;
2373                 /* Fall through */
2374         case SNDRV_PCM_STATE_PREPARED:
2375         case SNDRV_PCM_STATE_SUSPENDED:
2376                 err = 0;
2377                 break;
2378         case SNDRV_PCM_STATE_XRUN:
2379                 err = -EPIPE;
2380                 break;
2381         default:
2382               __badfd:
2383                 err = -EBADFD;
2384                 break;
2385         }
2386         snd_pcm_stream_unlock_irq(substream);
2387         return err;
2388 }
2389
2390 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2391                          snd_pcm_sframes_t __user *res)
2392 {
2393         struct snd_pcm_runtime *runtime = substream->runtime;
2394         int err;
2395         snd_pcm_sframes_t n = 0;
2396
2397         snd_pcm_stream_lock_irq(substream);
2398         switch (runtime->status->state) {
2399         case SNDRV_PCM_STATE_DRAINING:
2400                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2401                         goto __badfd;
2402         case SNDRV_PCM_STATE_RUNNING:
2403                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2404                         break;
2405                 /* Fall through */
2406         case SNDRV_PCM_STATE_PREPARED:
2407         case SNDRV_PCM_STATE_SUSPENDED:
2408                 err = 0;
2409                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2410                         n = snd_pcm_playback_hw_avail(runtime);
2411                 else
2412                         n = snd_pcm_capture_avail(runtime);
2413                 break;
2414         case SNDRV_PCM_STATE_XRUN:
2415                 err = -EPIPE;
2416                 break;
2417         default:
2418               __badfd:
2419                 err = -EBADFD;
2420                 break;
2421         }
2422         snd_pcm_stream_unlock_irq(substream);
2423         if (!err)
2424                 if (put_user(n, res))
2425                         err = -EFAULT;
2426         return err;
2427 }
2428
2429 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2430                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2431 {
2432         struct snd_pcm_runtime *runtime = substream->runtime;
2433         struct snd_pcm_sync_ptr sync_ptr;
2434         volatile struct snd_pcm_mmap_status *status;
2435         volatile struct snd_pcm_mmap_control *control;
2436         int err;
2437
2438         memset(&sync_ptr, 0, sizeof(sync_ptr));
2439         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2440                 return -EFAULT;
2441         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2442                 return -EFAULT;
2443         status = runtime->status;
2444         control = runtime->control;
2445         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2446                 err = snd_pcm_hwsync(substream);
2447                 if (err < 0)
2448                         return err;
2449         }
2450         snd_pcm_stream_lock_irq(substream);
2451         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2452                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2453         else
2454                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2455         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2456                 control->avail_min = sync_ptr.c.control.avail_min;
2457         else
2458                 sync_ptr.c.control.avail_min = control->avail_min;
2459         sync_ptr.s.status.state = status->state;
2460         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2461         sync_ptr.s.status.tstamp = status->tstamp;
2462         sync_ptr.s.status.suspended_state = status->suspended_state;
2463         snd_pcm_stream_unlock_irq(substream);
2464         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2465                 return -EFAULT;
2466         return 0;
2467 }
2468
2469 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2470 {
2471         struct snd_pcm_runtime *runtime = substream->runtime;
2472         int arg;
2473
2474         if (get_user(arg, _arg))
2475                 return -EFAULT;
2476         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2477                 return -EINVAL;
2478         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2479         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2480                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2481         return 0;
2482 }
2483
2484 static int snd_pcm_common_ioctl1(struct file *file,
2485                                  struct snd_pcm_substream *substream,
2486                                  unsigned int cmd, void __user *arg)
2487 {
2488         switch (cmd) {
2489         case SNDRV_PCM_IOCTL_PVERSION:
2490                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2491         case SNDRV_PCM_IOCTL_INFO:
2492                 return snd_pcm_info_user(substream, arg);
2493         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2494                 return 0;
2495         case SNDRV_PCM_IOCTL_TTSTAMP:
2496                 return snd_pcm_tstamp(substream, arg);
2497         case SNDRV_PCM_IOCTL_HW_REFINE:
2498                 return snd_pcm_hw_refine_user(substream, arg);
2499         case SNDRV_PCM_IOCTL_HW_PARAMS:
2500                 return snd_pcm_hw_params_user(substream, arg);
2501         case SNDRV_PCM_IOCTL_HW_FREE:
2502                 return snd_pcm_hw_free(substream);
2503         case SNDRV_PCM_IOCTL_SW_PARAMS:
2504                 return snd_pcm_sw_params_user(substream, arg);
2505         case SNDRV_PCM_IOCTL_STATUS:
2506                 return snd_pcm_status_user(substream, arg);
2507         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2508                 return snd_pcm_channel_info_user(substream, arg);
2509         case SNDRV_PCM_IOCTL_PREPARE:
2510                 return snd_pcm_prepare(substream, file);
2511         case SNDRV_PCM_IOCTL_RESET:
2512                 return snd_pcm_reset(substream);
2513         case SNDRV_PCM_IOCTL_START:
2514                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2515         case SNDRV_PCM_IOCTL_LINK:
2516                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2517         case SNDRV_PCM_IOCTL_UNLINK:
2518                 return snd_pcm_unlink(substream);
2519         case SNDRV_PCM_IOCTL_RESUME:
2520                 return snd_pcm_resume(substream);
2521         case SNDRV_PCM_IOCTL_XRUN:
2522                 return snd_pcm_xrun(substream);
2523         case SNDRV_PCM_IOCTL_HWSYNC:
2524                 return snd_pcm_hwsync(substream);
2525         case SNDRV_PCM_IOCTL_DELAY:
2526                 return snd_pcm_delay(substream, arg);
2527         case SNDRV_PCM_IOCTL_SYNC_PTR:
2528                 return snd_pcm_sync_ptr(substream, arg);
2529 #ifdef CONFIG_SND_SUPPORT_OLD_API
2530         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2531                 return snd_pcm_hw_refine_old_user(substream, arg);
2532         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2533                 return snd_pcm_hw_params_old_user(substream, arg);
2534 #endif
2535         case SNDRV_PCM_IOCTL_DRAIN:
2536                 return snd_pcm_drain(substream);
2537         case SNDRV_PCM_IOCTL_DROP:
2538                 return snd_pcm_drop(substream);
2539         case SNDRV_PCM_IOCTL_PAUSE:
2540         {
2541                 int res;
2542                 snd_pcm_stream_lock_irq(substream);
2543                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2544                 snd_pcm_stream_unlock_irq(substream);
2545                 return res;
2546         }
2547         }
2548         snd_printd("unknown ioctl = 0x%x\n", cmd);
2549         return -ENOTTY;
2550 }
2551
2552 static int snd_pcm_playback_ioctl1(struct file *file,
2553                                    struct snd_pcm_substream *substream,
2554                                    unsigned int cmd, void __user *arg)
2555 {
2556         if (snd_BUG_ON(!substream))
2557                 return -ENXIO;
2558         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2559                 return -EINVAL;
2560         switch (cmd) {
2561         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2562         {
2563                 struct snd_xferi xferi;
2564                 struct snd_xferi __user *_xferi = arg;
2565                 struct snd_pcm_runtime *runtime = substream->runtime;
2566                 snd_pcm_sframes_t result;
2567                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2568                         return -EBADFD;
2569                 if (put_user(0, &_xferi->result))
2570                         return -EFAULT;
2571                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2572                         return -EFAULT;
2573                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2574                 __put_user(result, &_xferi->result);
2575                 return result < 0 ? result : 0;
2576         }
2577         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2578         {
2579                 struct snd_xfern xfern;
2580                 struct snd_xfern __user *_xfern = arg;
2581                 struct snd_pcm_runtime *runtime = substream->runtime;
2582                 void __user **bufs;
2583                 snd_pcm_sframes_t result;
2584                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2585                         return -EBADFD;
2586                 if (runtime->channels > 128)
2587                         return -EINVAL;
2588                 if (put_user(0, &_xfern->result))
2589                         return -EFAULT;
2590                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2591                         return -EFAULT;
2592
2593                 bufs = memdup_user(xfern.bufs,
2594                                    sizeof(void *) * runtime->channels);
2595                 if (IS_ERR(bufs))
2596                         return PTR_ERR(bufs);
2597                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2598                 kfree(bufs);
2599                 __put_user(result, &_xfern->result);
2600                 return result < 0 ? result : 0;
2601         }
2602         case SNDRV_PCM_IOCTL_REWIND:
2603         {
2604                 snd_pcm_uframes_t frames;
2605                 snd_pcm_uframes_t __user *_frames = arg;
2606                 snd_pcm_sframes_t result;
2607                 if (get_user(frames, _frames))
2608                         return -EFAULT;
2609                 if (put_user(0, _frames))
2610                         return -EFAULT;
2611                 result = snd_pcm_playback_rewind(substream, frames);
2612                 __put_user(result, _frames);
2613                 return result < 0 ? result : 0;
2614         }
2615         case SNDRV_PCM_IOCTL_FORWARD:
2616         {
2617                 snd_pcm_uframes_t frames;
2618                 snd_pcm_uframes_t __user *_frames = arg;
2619                 snd_pcm_sframes_t result;
2620                 if (get_user(frames, _frames))
2621                         return -EFAULT;
2622                 if (put_user(0, _frames))
2623                         return -EFAULT;
2624                 result = snd_pcm_playback_forward(substream, frames);
2625                 __put_user(result, _frames);
2626                 return result < 0 ? result : 0;
2627         }
2628         }
2629         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2630 }
2631
2632 static int snd_pcm_capture_ioctl1(struct file *file,
2633                                   struct snd_pcm_substream *substream,
2634                                   unsigned int cmd, void __user *arg)
2635 {
2636         if (snd_BUG_ON(!substream))
2637                 return -ENXIO;
2638         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2639                 return -EINVAL;
2640         switch (cmd) {
2641         case SNDRV_PCM_IOCTL_READI_FRAMES:
2642         {
2643                 struct snd_xferi xferi;
2644                 struct snd_xferi __user *_xferi = arg;
2645                 struct snd_pcm_runtime *runtime = substream->runtime;
2646                 snd_pcm_sframes_t result;
2647                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2648                         return -EBADFD;
2649                 if (put_user(0, &_xferi->result))
2650                         return -EFAULT;
2651                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2652                         return -EFAULT;
2653                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2654                 __put_user(result, &_xferi->result);
2655                 return result < 0 ? result : 0;
2656         }
2657         case SNDRV_PCM_IOCTL_READN_FRAMES:
2658         {
2659                 struct snd_xfern xfern;
2660                 struct snd_xfern __user *_xfern = arg;
2661                 struct snd_pcm_runtime *runtime = substream->runtime;
2662                 void *bufs;
2663                 snd_pcm_sframes_t result;
2664                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2665                         return -EBADFD;
2666                 if (runtime->channels > 128)
2667                         return -EINVAL;
2668                 if (put_user(0, &_xfern->result))
2669                         return -EFAULT;
2670                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2671                         return -EFAULT;
2672
2673                 bufs = memdup_user(xfern.bufs,
2674                                    sizeof(void *) * runtime->channels);
2675                 if (IS_ERR(bufs))
2676                         return PTR_ERR(bufs);
2677                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2678                 kfree(bufs);
2679                 __put_user(result, &_xfern->result);
2680                 return result < 0 ? result : 0;
2681         }
2682         case SNDRV_PCM_IOCTL_REWIND:
2683         {
2684                 snd_pcm_uframes_t frames;
2685                 snd_pcm_uframes_t __user *_frames = arg;
2686                 snd_pcm_sframes_t result;
2687                 if (get_user(frames, _frames))
2688                         return -EFAULT;
2689                 if (put_user(0, _frames))
2690                         return -EFAULT;
2691                 result = snd_pcm_capture_rewind(substream, frames);
2692                 __put_user(result, _frames);
2693                 return result < 0 ? result : 0;
2694         }
2695         case SNDRV_PCM_IOCTL_FORWARD:
2696         {
2697                 snd_pcm_uframes_t frames;
2698                 snd_pcm_uframes_t __user *_frames = arg;
2699                 snd_pcm_sframes_t result;
2700                 if (get_user(frames, _frames))
2701                         return -EFAULT;
2702                 if (put_user(0, _frames))
2703                         return -EFAULT;
2704                 result = snd_pcm_capture_forward(substream, frames);
2705                 __put_user(result, _frames);
2706                 return result < 0 ? result : 0;
2707         }
2708         }
2709         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2710 }
2711
2712 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2713                                    unsigned long arg)
2714 {
2715         struct snd_pcm_file *pcm_file;
2716
2717         pcm_file = file->private_data;
2718
2719         if (((cmd >> 8) & 0xff) != 'A')
2720                 return -ENOTTY;
2721
2722         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2723                                        (void __user *)arg);
2724 }
2725
2726 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2727                                   unsigned long arg)
2728 {
2729         struct snd_pcm_file *pcm_file;
2730
2731         pcm_file = file->private_data;
2732
2733         if (((cmd >> 8) & 0xff) != 'A')
2734                 return -ENOTTY;
2735
2736         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2737                                       (void __user *)arg);
2738 }
2739
2740 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2741                          unsigned int cmd, void *arg)
2742 {
2743         mm_segment_t fs;
2744         int result;
2745
2746         fs = snd_enter_user();
2747         switch (substream->stream) {
2748         case SNDRV_PCM_STREAM_PLAYBACK:
2749                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2750                                                  (void __user *)arg);
2751                 break;
2752         case SNDRV_PCM_STREAM_CAPTURE:
2753                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2754                                                 (void __user *)arg);
2755                 break;
2756         default:
2757                 result = -EINVAL;
2758                 break;
2759         }
2760         snd_leave_user(fs);
2761         return result;
2762 }
2763
2764 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2765
2766 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2767                             loff_t * offset)
2768 {
2769         struct snd_pcm_file *pcm_file;
2770         struct snd_pcm_substream *substream;
2771         struct snd_pcm_runtime *runtime;
2772         snd_pcm_sframes_t result;
2773
2774         pcm_file = file->private_data;
2775         substream = pcm_file->substream;
2776         if (PCM_RUNTIME_CHECK(substream))
2777                 return -ENXIO;
2778         runtime = substream->runtime;
2779         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2780                 return -EBADFD;
2781         if (!frame_aligned(runtime, count))
2782                 return -EINVAL;
2783         count = bytes_to_frames(runtime, count);
2784         result = snd_pcm_lib_read(substream, buf, count);
2785         if (result > 0)
2786                 result = frames_to_bytes(runtime, result);
2787         return result;
2788 }
2789
2790 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2791                              size_t count, loff_t * offset)
2792 {
2793         struct snd_pcm_file *pcm_file;
2794         struct snd_pcm_substream *substream;
2795         struct snd_pcm_runtime *runtime;
2796         snd_pcm_sframes_t result;
2797
2798         pcm_file = file->private_data;
2799         substream = pcm_file->substream;
2800         if (PCM_RUNTIME_CHECK(substream))
2801                 return -ENXIO;
2802         runtime = substream->runtime;
2803         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2804                 return -EBADFD;
2805         if (!frame_aligned(runtime, count))
2806                 return -EINVAL;
2807         count = bytes_to_frames(runtime, count);
2808         result = snd_pcm_lib_write(substream, buf, count);
2809         if (result > 0)
2810                 result = frames_to_bytes(runtime, result);
2811         return result;
2812 }
2813
2814 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2815                              unsigned long nr_segs, loff_t pos)
2816
2817 {
2818         struct snd_pcm_file *pcm_file;
2819         struct snd_pcm_substream *substream;
2820         struct snd_pcm_runtime *runtime;
2821         snd_pcm_sframes_t result;
2822         unsigned long i;
2823         void __user **bufs;
2824         snd_pcm_uframes_t frames;
2825
2826         pcm_file = iocb->ki_filp->private_data;
2827         substream = pcm_file->substream;
2828         if (PCM_RUNTIME_CHECK(substream))
2829                 return -ENXIO;
2830         runtime = substream->runtime;
2831         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2832                 return -EBADFD;
2833         if (nr_segs > 1024 || nr_segs != runtime->channels)
2834                 return -EINVAL;
2835         if (!frame_aligned(runtime, iov->iov_len))
2836                 return -EINVAL;
2837         frames = bytes_to_samples(runtime, iov->iov_len);
2838         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2839         if (bufs == NULL)
2840                 return -ENOMEM;
2841         for (i = 0; i < nr_segs; ++i)
2842                 bufs[i] = iov[i].iov_base;
2843         result = snd_pcm_lib_readv(substream, bufs, frames);
2844         if (result > 0)
2845                 result = frames_to_bytes(runtime, result);
2846         kfree(bufs);
2847         return result;
2848 }
2849
2850 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2851                               unsigned long nr_segs, loff_t pos)
2852 {
2853         struct snd_pcm_file *pcm_file;
2854         struct snd_pcm_substream *substream;
2855         struct snd_pcm_runtime *runtime;
2856         snd_pcm_sframes_t result;
2857         unsigned long i;
2858         void __user **bufs;
2859         snd_pcm_uframes_t frames;
2860
2861         pcm_file = iocb->ki_filp->private_data;
2862         substream = pcm_file->substream;
2863         if (PCM_RUNTIME_CHECK(substream))
2864                 return -ENXIO;
2865         runtime = substream->runtime;
2866         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2867                 return -EBADFD;
2868         if (nr_segs > 128 || nr_segs != runtime->channels ||
2869             !frame_aligned(runtime, iov->iov_len))
2870                 return -EINVAL;
2871         frames = bytes_to_samples(runtime, iov->iov_len);
2872         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2873         if (bufs == NULL)
2874                 return -ENOMEM;
2875         for (i = 0; i < nr_segs; ++i)
2876                 bufs[i] = iov[i].iov_base;
2877         result = snd_pcm_lib_writev(substream, bufs, frames);
2878         if (result > 0)
2879                 result = frames_to_bytes(runtime, result);
2880         kfree(bufs);
2881         return result;
2882 }
2883
2884 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2885 {
2886         struct snd_pcm_file *pcm_file;
2887         struct snd_pcm_substream *substream;
2888         struct snd_pcm_runtime *runtime;
2889         unsigned int mask;
2890         snd_pcm_uframes_t avail;
2891
2892         pcm_file = file->private_data;
2893
2894         substream = pcm_file->substream;
2895         if (PCM_RUNTIME_CHECK(substream))
2896                 return -ENXIO;
2897         runtime = substream->runtime;
2898
2899         poll_wait(file, &runtime->sleep, wait);
2900
2901         snd_pcm_stream_lock_irq(substream);
2902         avail = snd_pcm_playback_avail(runtime);
2903         switch (runtime->status->state) {
2904         case SNDRV_PCM_STATE_RUNNING:
2905         case SNDRV_PCM_STATE_PREPARED:
2906         case SNDRV_PCM_STATE_PAUSED:
2907                 if (avail >= runtime->control->avail_min) {
2908                         mask = POLLOUT | POLLWRNORM;
2909                         break;
2910                 }
2911                 /* Fall through */
2912         case SNDRV_PCM_STATE_DRAINING:
2913                 mask = 0;
2914                 break;
2915         default:
2916                 mask = POLLOUT | POLLWRNORM | POLLERR;
2917                 break;
2918         }
2919         snd_pcm_stream_unlock_irq(substream);
2920         return mask;
2921 }
2922
2923 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2924 {
2925         struct snd_pcm_file *pcm_file;
2926         struct snd_pcm_substream *substream;
2927         struct snd_pcm_runtime *runtime;
2928         unsigned int mask;
2929         snd_pcm_uframes_t avail;
2930
2931         pcm_file = file->private_data;
2932
2933         substream = pcm_file->substream;
2934         if (PCM_RUNTIME_CHECK(substream))
2935                 return -ENXIO;
2936         runtime = substream->runtime;
2937
2938         poll_wait(file, &runtime->sleep, wait);
2939
2940         snd_pcm_stream_lock_irq(substream);
2941         avail = snd_pcm_capture_avail(runtime);
2942         switch (runtime->status->state) {
2943         case SNDRV_PCM_STATE_RUNNING:
2944         case SNDRV_PCM_STATE_PREPARED:
2945         case SNDRV_PCM_STATE_PAUSED:
2946                 if (avail >= runtime->control->avail_min) {
2947                         mask = POLLIN | POLLRDNORM;
2948                         break;
2949                 }
2950                 mask = 0;
2951                 break;
2952         case SNDRV_PCM_STATE_DRAINING:
2953                 if (avail > 0) {
2954                         mask = POLLIN | POLLRDNORM;
2955                         break;
2956                 }
2957                 /* Fall through */
2958         default:
2959                 mask = POLLIN | POLLRDNORM | POLLERR;
2960                 break;
2961         }
2962         snd_pcm_stream_unlock_irq(substream);
2963         return mask;
2964 }
2965
2966 /*
2967  * mmap support
2968  */
2969
2970 /*
2971  * Only on coherent architectures, we can mmap the status and the control records
2972  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2973  */
2974 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2975 /*
2976  * mmap status record
2977  */
2978 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2979                                                 struct vm_fault *vmf)
2980 {
2981         struct snd_pcm_substream *substream = area->vm_private_data;
2982         struct snd_pcm_runtime *runtime;
2983
2984         if (substream == NULL)
2985                 return VM_FAULT_SIGBUS;
2986         runtime = substream->runtime;
2987         vmf->page = virt_to_page(runtime->status);
2988         get_page(vmf->page);
2989         return 0;
2990 }
2991
2992 static struct vm_operations_struct snd_pcm_vm_ops_status =
2993 {
2994         .fault =        snd_pcm_mmap_status_fault,
2995 };
2996
2997 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
2998                                struct vm_area_struct *area)
2999 {
3000         struct snd_pcm_runtime *runtime;
3001         long size;
3002         if (!(area->vm_flags & VM_READ))
3003                 return -EINVAL;
3004         runtime = substream->runtime;
3005         size = area->vm_end - area->vm_start;
3006         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3007                 return -EINVAL;
3008         area->vm_ops = &snd_pcm_vm_ops_status;
3009         area->vm_private_data = substream;
3010         area->vm_flags |= VM_RESERVED;
3011         return 0;
3012 }
3013
3014 /*
3015  * mmap control record
3016  */
3017 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3018                                                 struct vm_fault *vmf)
3019 {
3020         struct snd_pcm_substream *substream = area->vm_private_data;
3021         struct snd_pcm_runtime *runtime;
3022
3023         if (substream == NULL)
3024                 return VM_FAULT_SIGBUS;
3025         runtime = substream->runtime;
3026         vmf->page = virt_to_page(runtime->control);
3027         get_page(vmf->page);
3028         return 0;
3029 }
3030
3031 static struct vm_operations_struct snd_pcm_vm_ops_control =
3032 {
3033         .fault =        snd_pcm_mmap_control_fault,
3034 };
3035
3036 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3037                                 struct vm_area_struct *area)
3038 {
3039         struct snd_pcm_runtime *runtime;
3040         long size;
3041         if (!(area->vm_flags & VM_READ))
3042                 return -EINVAL;
3043         runtime = substream->runtime;
3044         size = area->vm_end - area->vm_start;
3045         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3046                 return -EINVAL;
3047         area->vm_ops = &snd_pcm_vm_ops_control;
3048         area->vm_private_data = substream;
3049         area->vm_flags |= VM_RESERVED;
3050         return 0;
3051 }
3052 #else /* ! coherent mmap */
3053 /*
3054  * don't support mmap for status and control records.
3055  */
3056 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3057                                struct vm_area_struct *area)
3058 {
3059         return -ENXIO;
3060 }
3061 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3062                                 struct vm_area_struct *area)
3063 {
3064         return -ENXIO;
3065 }
3066 #endif /* coherent mmap */
3067
3068 /*
3069  * fault callback for mmapping a RAM page
3070  */
3071 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3072                                                 struct vm_fault *vmf)
3073 {
3074         struct snd_pcm_substream *substream = area->vm_private_data;
3075         struct snd_pcm_runtime *runtime;
3076         unsigned long offset;
3077         struct page * page;
3078         void *vaddr;
3079         size_t dma_bytes;
3080
3081         if (substream == NULL)
3082                 return VM_FAULT_SIGBUS;
3083         runtime = substream->runtime;
3084         offset = vmf->pgoff << PAGE_SHIFT;
3085         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3086         if (offset > dma_bytes - PAGE_SIZE)
3087                 return VM_FAULT_SIGBUS;
3088         if (substream->ops->page) {
3089                 page = substream->ops->page(substream, offset);
3090                 if (!page)
3091                         return VM_FAULT_SIGBUS;
3092         } else {
3093                 vaddr = runtime->dma_area + offset;
3094                 page = virt_to_page(vaddr);
3095         }
3096         get_page(page);
3097         vmf->page = page;
3098         return 0;
3099 }
3100
3101 static struct vm_operations_struct snd_pcm_vm_ops_data =
3102 {
3103         .open =         snd_pcm_mmap_data_open,
3104         .close =        snd_pcm_mmap_data_close,
3105         .fault =        snd_pcm_mmap_data_fault,
3106 };
3107
3108 /*
3109  * mmap the DMA buffer on RAM
3110  */
3111 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3112                                 struct vm_area_struct *area)
3113 {
3114         area->vm_ops = &snd_pcm_vm_ops_data;
3115         area->vm_private_data = substream;
3116         area->vm_flags |= VM_RESERVED;
3117         atomic_inc(&substream->mmap_count);
3118         return 0;
3119 }
3120
3121 /*
3122  * mmap the DMA buffer on I/O memory area
3123  */
3124 #if SNDRV_PCM_INFO_MMAP_IOMEM
3125 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3126 {
3127         .open =         snd_pcm_mmap_data_open,
3128         .close =        snd_pcm_mmap_data_close,
3129 };
3130
3131 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3132                            struct vm_area_struct *area)
3133 {
3134         long size;
3135         unsigned long offset;
3136
3137 #ifdef pgprot_noncached
3138         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3139 #endif
3140         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3141         area->vm_private_data = substream;
3142         area->vm_flags |= VM_IO;
3143         size = area->vm_end - area->vm_start;
3144         offset = area->vm_pgoff << PAGE_SHIFT;
3145         if (io_remap_pfn_range(area, area->vm_start,
3146                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3147                                 size, area->vm_page_prot))
3148                 return -EAGAIN;
3149         atomic_inc(&substream->mmap_count);
3150         return 0;
3151 }
3152
3153 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3154 #endif /* SNDRV_PCM_INFO_MMAP */
3155
3156 /*
3157  * mmap DMA buffer
3158  */
3159 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3160                       struct vm_area_struct *area)
3161 {
3162         struct snd_pcm_runtime *runtime;
3163         long size;
3164         unsigned long offset;
3165         size_t dma_bytes;
3166
3167         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3168                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3169                         return -EINVAL;
3170         } else {
3171                 if (!(area->vm_flags & VM_READ))
3172                         return -EINVAL;
3173         }
3174         runtime = substream->runtime;
3175         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3176                 return -EBADFD;
3177         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3178                 return -ENXIO;
3179         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3180             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3181                 return -EINVAL;
3182         size = area->vm_end - area->vm_start;
3183         offset = area->vm_pgoff << PAGE_SHIFT;
3184         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3185         if ((size_t)size > dma_bytes)
3186                 return -EINVAL;
3187         if (offset > dma_bytes - size)
3188                 return -EINVAL;
3189
3190         if (substream->ops->mmap)
3191                 return substream->ops->mmap(substream, area);
3192         else
3193                 return snd_pcm_default_mmap(substream, area);
3194 }
3195
3196 EXPORT_SYMBOL(snd_pcm_mmap_data);
3197
3198 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3199 {
3200         struct snd_pcm_file * pcm_file;
3201         struct snd_pcm_substream *substream;
3202         unsigned long offset;
3203
3204         pcm_file = file->private_data;
3205         substream = pcm_file->substream;
3206         if (PCM_RUNTIME_CHECK(substream))
3207                 return -ENXIO;
3208
3209         offset = area->vm_pgoff << PAGE_SHIFT;
3210         switch (offset) {
3211         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3212                 if (pcm_file->no_compat_mmap)
3213                         return -ENXIO;
3214                 return snd_pcm_mmap_status(substream, file, area);
3215         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3216                 if (pcm_file->no_compat_mmap)
3217                         return -ENXIO;
3218                 return snd_pcm_mmap_control(substream, file, area);
3219         default:
3220                 return snd_pcm_mmap_data(substream, file, area);
3221         }
3222         return 0;
3223 }
3224
3225 static int snd_pcm_fasync(int fd, struct file * file, int on)
3226 {
3227         struct snd_pcm_file * pcm_file;
3228         struct snd_pcm_substream *substream;
3229         struct snd_pcm_runtime *runtime;
3230         int err = -ENXIO;
3231
3232         lock_kernel();
3233         pcm_file = file->private_data;
3234         substream = pcm_file->substream;
3235         if (PCM_RUNTIME_CHECK(substream))
3236                 goto out;
3237         runtime = substream->runtime;
3238         err = fasync_helper(fd, file, on, &runtime->fasync);
3239 out:
3240         unlock_kernel();
3241         return err;
3242 }
3243
3244 /*
3245  * ioctl32 compat
3246  */
3247 #ifdef CONFIG_COMPAT
3248 #include "pcm_compat.c"
3249 #else
3250 #define snd_pcm_ioctl_compat    NULL
3251 #endif
3252
3253 /*
3254  *  To be removed helpers to keep binary compatibility
3255  */
3256
3257 #ifdef CONFIG_SND_SUPPORT_OLD_API
3258 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3259 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3260
3261 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3262                                                struct snd_pcm_hw_params_old *oparams)
3263 {
3264         unsigned int i;
3265
3266         memset(params, 0, sizeof(*params));
3267         params->flags = oparams->flags;
3268         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3269                 params->masks[i].bits[0] = oparams->masks[i];
3270         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3271         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3272         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3273         params->info = oparams->info;
3274         params->msbits = oparams->msbits;
3275         params->rate_num = oparams->rate_num;
3276         params->rate_den = oparams->rate_den;
3277         params->fifo_size = oparams->fifo_size;
3278 }
3279
3280 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3281                                              struct snd_pcm_hw_params *params)
3282 {
3283         unsigned int i;
3284
3285         memset(oparams, 0, sizeof(*oparams));
3286         oparams->flags = params->flags;
3287         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3288                 oparams->masks[i] = params->masks[i].bits[0];
3289         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3290         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3291         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3292         oparams->info = params->info;
3293         oparams->msbits = params->msbits;
3294         oparams->rate_num = params->rate_num;
3295         oparams->rate_den = params->rate_den;
3296         oparams->fifo_size = params->fifo_size;
3297 }
3298
3299 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3300                                       struct snd_pcm_hw_params_old __user * _oparams)
3301 {
3302         struct snd_pcm_hw_params *params;
3303         struct snd_pcm_hw_params_old *oparams = NULL;
3304         int err;
3305
3306         params = kmalloc(sizeof(*params), GFP_KERNEL);
3307         if (!params)
3308                 return -ENOMEM;
3309
3310         oparams = memdup_user(_oparams, sizeof(*oparams));
3311         if (IS_ERR(oparams)) {
3312                 err = PTR_ERR(oparams);
3313                 goto out;
3314         }
3315         snd_pcm_hw_convert_from_old_params(params, oparams);
3316         err = snd_pcm_hw_refine(substream, params);
3317         snd_pcm_hw_convert_to_old_params(oparams, params);
3318         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3319                 if (!err)
3320                         err = -EFAULT;
3321         }
3322
3323         kfree(oparams);
3324 out:
3325         kfree(params);
3326         return err;
3327 }
3328
3329 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3330                                       struct snd_pcm_hw_params_old __user * _oparams)
3331 {
3332         struct snd_pcm_hw_params *params;
3333         struct snd_pcm_hw_params_old *oparams = NULL;
3334         int err;
3335
3336         params = kmalloc(sizeof(*params), GFP_KERNEL);
3337         if (!params)
3338                 return -ENOMEM;
3339
3340         oparams = memdup_user(_oparams, sizeof(*oparams));
3341         if (IS_ERR(oparams)) {
3342                 err = PTR_ERR(oparams);
3343                 goto out;
3344         }
3345         snd_pcm_hw_convert_from_old_params(params, oparams);
3346         err = snd_pcm_hw_params(substream, params);
3347         snd_pcm_hw_convert_to_old_params(oparams, params);
3348         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3349                 if (!err)
3350                         err = -EFAULT;
3351         }
3352
3353         kfree(oparams);
3354 out:
3355         kfree(params);
3356         return err;
3357 }
3358 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3359
3360 #ifndef CONFIG_MMU
3361 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3362                                       unsigned long len, unsigned long pgoff,
3363                                       unsigned long flags)
3364 {
3365         return 0;
3366 }
3367 #else
3368 # define dummy_get_unmapped_area NULL
3369 #endif
3370
3371 /*
3372  *  Register section
3373  */
3374
3375 const struct file_operations snd_pcm_f_ops[2] = {
3376         {
3377                 .owner =                THIS_MODULE,
3378                 .write =                snd_pcm_write,
3379                 .aio_write =            snd_pcm_aio_write,
3380                 .open =                 snd_pcm_playback_open,
3381                 .release =              snd_pcm_release,
3382                 .poll =                 snd_pcm_playback_poll,
3383                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3384                 .compat_ioctl =         snd_pcm_ioctl_compat,
3385                 .mmap =                 snd_pcm_mmap,
3386                 .fasync =               snd_pcm_fasync,
3387                 .get_unmapped_area =    dummy_get_unmapped_area,
3388         },
3389         {
3390                 .owner =                THIS_MODULE,
3391                 .read =                 snd_pcm_read,
3392                 .aio_read =             snd_pcm_aio_read,
3393                 .open =                 snd_pcm_capture_open,
3394                 .release =              snd_pcm_release,
3395                 .poll =                 snd_pcm_capture_poll,
3396                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3397                 .compat_ioctl =         snd_pcm_ioctl_compat,
3398                 .mmap =                 snd_pcm_mmap,
3399                 .fasync =               snd_pcm_fasync,
3400                 .get_unmapped_area =    dummy_get_unmapped_area,
3401         }
3402 };