git.oblomov.eu Git - linux-2.6/blob - 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("%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("%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("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 = kmalloc(sizeof(*params), GFP_KERNEL);
 331         if (!params) {
 332                 err = -ENOMEM;
 333                 goto out;
 334         }
 335         if (copy_from_user(params, _params, sizeof(*params))) {
 336                 err = -EFAULT;
 337                 goto out;
 338         }
 339         err = snd_pcm_hw_refine(substream, params);
 340         if (copy_to_user(_params, params, sizeof(*params))) {
 341                 if (!err)
 342                         err = -EFAULT;
 343         }
 344 out:
 345         kfree(params);
 346         return err;
 347 }
 348
 349 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 350 {
 351         int usecs;
 352
 353         if (! runtime->rate)
 354                 return -1; /* invalid */
 355
 356         /* take 75% of period time as the deadline */
 357         usecs = (750000 / runtime->rate) * runtime->period_size;
 358         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 359                 runtime->rate;
 360
 361         return usecs;
 362 }
 363
 364 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 365                              struct snd_pcm_hw_params *params)
 366 {
 367         struct snd_pcm_runtime *runtime;
 368         int err, usecs;
 369         unsigned int bits;
 370         snd_pcm_uframes_t frames;
 371
 372         if (PCM_RUNTIME_CHECK(substream))
 373                 return -ENXIO;
 374         runtime = substream->runtime;
 375         snd_pcm_stream_lock_irq(substream);
 376         switch (runtime->status->state) {
 377         case SNDRV_PCM_STATE_OPEN:
 378         case SNDRV_PCM_STATE_SETUP:
 379         case SNDRV_PCM_STATE_PREPARED:
 380                 break;
 381         default:
 382                 snd_pcm_stream_unlock_irq(substream);
 383                 return -EBADFD;
 384         }
 385         snd_pcm_stream_unlock_irq(substream);
 386 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 387         if (!substream->oss.oss)
 388 #endif
 389                 if (atomic_read(&substream->mmap_count))
 390                         return -EBADFD;
 391
 392         params->rmask = ~0U;
 393         err = snd_pcm_hw_refine(substream, params);
 394         if (err < 0)
 395                 goto _error;
 396
 397         err = snd_pcm_hw_params_choose(substream, params);
 398         if (err < 0)
 399                 goto _error;
 400
 401         if (substream->ops->hw_params != NULL) {
 402                 err = substream->ops->hw_params(substream, params);
 403                 if (err < 0)
 404                         goto _error;
 405         }
 406
 407         runtime->access = params_access(params);
 408         runtime->format = params_format(params);
 409         runtime->subformat = params_subformat(params);
 410         runtime->channels = params_channels(params);
 411         runtime->rate = params_rate(params);
 412         runtime->period_size = params_period_size(params);
 413         runtime->periods = params_periods(params);
 414         runtime->buffer_size = params_buffer_size(params);
 415         runtime->info = params->info;
 416         runtime->rate_num = params->rate_num;
 417         runtime->rate_den = params->rate_den;
 418
 419         bits = snd_pcm_format_physical_width(runtime->format);
 420         runtime->sample_bits = bits;
 421         bits *= runtime->channels;
 422         runtime->frame_bits = bits;
 423         frames = 1;
 424         while (bits % 8 != 0) {
 425                 bits *= 2;
 426                 frames *= 2;
 427         }
 428         runtime->byte_align = bits / 8;
 429         runtime->min_align = frames;
 430
 431         /* Default sw params */
 432         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 433         runtime->period_step = 1;
 434         runtime->control->avail_min = runtime->period_size;
 435         runtime->start_threshold = 1;
 436         runtime->stop_threshold = runtime->buffer_size;
 437         runtime->silence_threshold = 0;
 438         runtime->silence_size = 0;
 439         runtime->boundary = runtime->buffer_size;
 440         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 441                 runtime->boundary *= 2;
 442
 443         snd_pcm_timer_resolution_change(substream);
 444         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 445
 446         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 447                                 substream->latency_id);
 448         if ((usecs = period_to_usecs(runtime)) >= 0)
 449                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
 450                                         substream->latency_id, usecs);
 451         return 0;
 452  _error:
 453         /* hardware might be unuseable from this time,
 454            so we force application to retry to set
 455            the correct hardware parameter settings */
 456         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 457         if (substream->ops->hw_free != NULL)
 458                 substream->ops->hw_free(substream);
 459         return err;
 460 }
 461
 462 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 463                                   struct snd_pcm_hw_params __user * _params)
 464 {
 465         struct snd_pcm_hw_params *params;
 466         int err;
 467
 468         params = kmalloc(sizeof(*params), GFP_KERNEL);
 469         if (!params) {
 470                 err = -ENOMEM;
 471                 goto out;
 472         }
 473         if (copy_from_user(params, _params, sizeof(*params))) {
 474                 err = -EFAULT;
 475                 goto out;
 476         }
 477         err = snd_pcm_hw_params(substream, params);
 478         if (copy_to_user(_params, params, sizeof(*params))) {
 479                 if (!err)
 480                         err = -EFAULT;
 481         }
 482 out:
 483         kfree(params);
 484         return err;
 485 }
 486
 487 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 488 {
 489         struct snd_pcm_runtime *runtime;
 490         int result = 0;
 491
 492         if (PCM_RUNTIME_CHECK(substream))
 493                 return -ENXIO;
 494         runtime = substream->runtime;
 495         snd_pcm_stream_lock_irq(substream);
 496         switch (runtime->status->state) {
 497         case SNDRV_PCM_STATE_SETUP:
 498         case SNDRV_PCM_STATE_PREPARED:
 499                 break;
 500         default:
 501                 snd_pcm_stream_unlock_irq(substream);
 502                 return -EBADFD;
 503         }
 504         snd_pcm_stream_unlock_irq(substream);
 505         if (atomic_read(&substream->mmap_count))
 506                 return -EBADFD;
 507         if (substream->ops->hw_free)
 508                 result = substream->ops->hw_free(substream);
 509         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 510         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 511                 substream->latency_id);
 512         return result;
 513 }
 514
 515 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 516                              struct snd_pcm_sw_params *params)
 517 {
 518         struct snd_pcm_runtime *runtime;
 519
 520         if (PCM_RUNTIME_CHECK(substream))
 521                 return -ENXIO;
 522         runtime = substream->runtime;
 523         snd_pcm_stream_lock_irq(substream);
 524         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 525                 snd_pcm_stream_unlock_irq(substream);
 526                 return -EBADFD;
 527         }
 528         snd_pcm_stream_unlock_irq(substream);
 529
 530         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 531                 return -EINVAL;
 532         if (params->avail_min == 0)
 533                 return -EINVAL;
 534         if (params->silence_size >= runtime->boundary) {
 535                 if (params->silence_threshold != 0)
 536                         return -EINVAL;
 537         } else {
 538                 if (params->silence_size > params->silence_threshold)
 539                         return -EINVAL;
 540                 if (params->silence_threshold > runtime->buffer_size)
 541                         return -EINVAL;
 542         }
 543         snd_pcm_stream_lock_irq(substream);
 544         runtime->tstamp_mode = params->tstamp_mode;
 545         runtime->period_step = params->period_step;
 546         runtime->control->avail_min = params->avail_min;
 547         runtime->start_threshold = params->start_threshold;
 548         runtime->stop_threshold = params->stop_threshold;
 549         runtime->silence_threshold = params->silence_threshold;
 550         runtime->silence_size = params->silence_size;
 551         params->boundary = runtime->boundary;
 552         if (snd_pcm_running(substream)) {
 553                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 554                     runtime->silence_size > 0)
 555                         snd_pcm_playback_silence(substream, ULONG_MAX);
 556                 wake_up(&runtime->sleep);
 557         }
 558         snd_pcm_stream_unlock_irq(substream);
 559         return 0;
 560 }
 561
 562 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 563                                   struct snd_pcm_sw_params __user * _params)
 564 {
 565         struct snd_pcm_sw_params params;
 566         int err;
 567         if (copy_from_user(&params, _params, sizeof(params)))
 568                 return -EFAULT;
 569         err = snd_pcm_sw_params(substream, &params);
 570         if (copy_to_user(_params, &params, sizeof(params)))
 571                 return -EFAULT;
 572         return err;
 573 }
 574
 575 int snd_pcm_status(struct snd_pcm_substream *substream,
 576                    struct snd_pcm_status *status)
 577 {
 578         struct snd_pcm_runtime *runtime = substream->runtime;
 579
 580         snd_pcm_stream_lock_irq(substream);
 581         status->state = runtime->status->state;
 582         status->suspended_state = runtime->status->suspended_state;
 583         if (status->state == SNDRV_PCM_STATE_OPEN)
 584                 goto _end;
 585         status->trigger_tstamp = runtime->trigger_tstamp;
 586         if (snd_pcm_running(substream)) {
 587                 snd_pcm_update_hw_ptr(substream);
 588                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 589                         status->tstamp = runtime->status->tstamp;
 590                         goto _tstamp_end;
 591                 }
 592         }
 593         snd_pcm_gettime(runtime, &status->tstamp);
 594  _tstamp_end:
 595         status->appl_ptr = runtime->control->appl_ptr;
 596         status->hw_ptr = runtime->status->hw_ptr;
 597         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 598                 status->avail = snd_pcm_playback_avail(runtime);
 599                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 600                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 601                         status->delay = runtime->buffer_size - status->avail;
 602                 else
 603                         status->delay = 0;
 604         } else {
 605                 status->avail = snd_pcm_capture_avail(runtime);
 606                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 607                         status->delay = status->avail;
 608                 else
 609                         status->delay = 0;
 610         }
 611         status->avail_max = runtime->avail_max;
 612         status->overrange = runtime->overrange;
 613         runtime->avail_max = 0;
 614         runtime->overrange = 0;
 615  _end:
 616         snd_pcm_stream_unlock_irq(substream);
 617         return 0;
 618 }
 619
 620 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 621                                struct snd_pcm_status __user * _status)
 622 {
 623         struct snd_pcm_status status;
 624         int res;
 625
 626         memset(&status, 0, sizeof(status));
 627         res = snd_pcm_status(substream, &status);
 628         if (res < 0)
 629                 return res;
 630         if (copy_to_user(_status, &status, sizeof(status)))
 631                 return -EFAULT;
 632         return 0;
 633 }
 634
 635 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 636                                 struct snd_pcm_channel_info * info)
 637 {
 638         struct snd_pcm_runtime *runtime;
 639         unsigned int channel;
 640
 641         channel = info->channel;
 642         runtime = substream->runtime;
 643         snd_pcm_stream_lock_irq(substream);
 644         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 645                 snd_pcm_stream_unlock_irq(substream);
 646                 return -EBADFD;
 647         }
 648         snd_pcm_stream_unlock_irq(substream);
 649         if (channel >= runtime->channels)
 650                 return -EINVAL;
 651         memset(info, 0, sizeof(*info));
 652         info->channel = channel;
 653         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 654 }
 655
 656 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 657                                      struct snd_pcm_channel_info __user * _info)
 658 {
 659         struct snd_pcm_channel_info info;
 660         int res;
 661
 662         if (copy_from_user(&info, _info, sizeof(info)))
 663                 return -EFAULT;
 664         res = snd_pcm_channel_info(substream, &info);
 665         if (res < 0)
 666                 return res;
 667         if (copy_to_user(_info, &info, sizeof(info)))
 668                 return -EFAULT;
 669         return 0;
 670 }
 671
 672 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 673 {
 674         struct snd_pcm_runtime *runtime = substream->runtime;
 675         if (runtime->trigger_master == NULL)
 676                 return;
 677         if (runtime->trigger_master == substream) {
 678                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 679         } else {
 680                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 681                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 682         }
 683         runtime->trigger_master = NULL;
 684 }
 685
 686 struct action_ops {
 687         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 688         int (*do_action)(struct snd_pcm_substream *substream, int state);
 689         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 690         void (*post_action)(struct snd_pcm_substream *substream, int state);
 691 };
 692
 693 /*
 694  *  this functions is core for handling of linked stream
 695  *  Note: the stream state might be changed also on failure
 696  *  Note2: call with calling stream lock + link lock
 697  */
 698 static int snd_pcm_action_group(struct action_ops *ops,
 699                                 struct snd_pcm_substream *substream,
 700                                 int state, int do_lock)
 701 {
 702         struct snd_pcm_substream *s = NULL;
 703         struct snd_pcm_substream *s1;
 704         int res = 0;
 705
 706         snd_pcm_group_for_each_entry(s, substream) {
 707                 if (do_lock && s != substream)
 708                         spin_lock_nested(&s->self_group.lock,
 709                                          SINGLE_DEPTH_NESTING);
 710                 res = ops->pre_action(s, state);
 711                 if (res < 0)
 712                         goto _unlock;
 713         }
 714         snd_pcm_group_for_each_entry(s, substream) {
 715                 res = ops->do_action(s, state);
 716                 if (res < 0) {
 717                         if (ops->undo_action) {
 718                                 snd_pcm_group_for_each_entry(s1, substream) {
 719                                         if (s1 == s) /* failed stream */
 720                                                 break;
 721                                         ops->undo_action(s1, state);
 722                                 }
 723                         }
 724                         s = NULL; /* unlock all */
 725                         goto _unlock;
 726                 }
 727         }
 728         snd_pcm_group_for_each_entry(s, substream) {
 729                 ops->post_action(s, state);
 730         }
 731  _unlock:
 732         if (do_lock) {
 733                 /* unlock streams */
 734                 snd_pcm_group_for_each_entry(s1, substream) {
 735                         if (s1 != substream)
 736                                 spin_unlock(&s1->self_group.lock);
 737                         if (s1 == s)    /* end */
 738                                 break;
 739                 }
 740         }
 741         return res;
 742 }
 743
 744 /*
 745  *  Note: call with stream lock
 746  */
 747 static int snd_pcm_action_single(struct action_ops *ops,
 748                                  struct snd_pcm_substream *substream,
 749                                  int state)
 750 {
 751         int res;
 752
 753         res = ops->pre_action(substream, state);
 754         if (res < 0)
 755                 return res;
 756         res = ops->do_action(substream, state);
 757         if (res == 0)
 758                 ops->post_action(substream, state);
 759         else if (ops->undo_action)
 760                 ops->undo_action(substream, state);
 761         return res;
 762 }
 763
 764 /*
 765  *  Note: call with stream lock
 766  */
 767 static int snd_pcm_action(struct action_ops *ops,
 768                           struct snd_pcm_substream *substream,
 769                           int state)
 770 {
 771         int res;
 772
 773         if (snd_pcm_stream_linked(substream)) {
 774                 if (!spin_trylock(&substream->group->lock)) {
 775                         spin_unlock(&substream->self_group.lock);
 776                         spin_lock(&substream->group->lock);
 777                         spin_lock(&substream->self_group.lock);
 778                 }
 779                 res = snd_pcm_action_group(ops, substream, state, 1);
 780                 spin_unlock(&substream->group->lock);
 781         } else {
 782                 res = snd_pcm_action_single(ops, substream, state);
 783         }
 784         return res;
 785 }
 786
 787 /*
 788  *  Note: don't use any locks before
 789  */
 790 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 791                                    struct snd_pcm_substream *substream,
 792                                    int state)
 793 {
 794         int res;
 795
 796         read_lock_irq(&snd_pcm_link_rwlock);
 797         if (snd_pcm_stream_linked(substream)) {
 798                 spin_lock(&substream->group->lock);
 799                 spin_lock(&substream->self_group.lock);
 800                 res = snd_pcm_action_group(ops, substream, state, 1);
 801                 spin_unlock(&substream->self_group.lock);
 802                 spin_unlock(&substream->group->lock);
 803         } else {
 804                 spin_lock(&substream->self_group.lock);
 805                 res = snd_pcm_action_single(ops, substream, state);
 806                 spin_unlock(&substream->self_group.lock);
 807         }
 808         read_unlock_irq(&snd_pcm_link_rwlock);
 809         return res;
 810 }
 811
 812 /*
 813  */
 814 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 815                                     struct snd_pcm_substream *substream,
 816                                     int state)
 817 {
 818         int res;
 819
 820         down_read(&snd_pcm_link_rwsem);
 821         if (snd_pcm_stream_linked(substream))
 822                 res = snd_pcm_action_group(ops, substream, state, 0);
 823         else
 824                 res = snd_pcm_action_single(ops, substream, state);
 825         up_read(&snd_pcm_link_rwsem);
 826         return res;
 827 }
 828
 829 /*
 830  * start callbacks
 831  */
 832 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 833 {
 834         struct snd_pcm_runtime *runtime = substream->runtime;
 835         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 836                 return -EBADFD;
 837         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 838             !snd_pcm_playback_data(substream))
 839                 return -EPIPE;
 840         runtime->trigger_master = substream;
 841         return 0;
 842 }
 843
 844 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 845 {
 846         if (substream->runtime->trigger_master != substream)
 847                 return 0;
 848         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 849 }
 850
 851 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 852 {
 853         if (substream->runtime->trigger_master == substream)
 854                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 855 }
 856
 857 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 858 {
 859         struct snd_pcm_runtime *runtime = substream->runtime;
 860         snd_pcm_trigger_tstamp(substream);
 861         runtime->status->state = state;
 862         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 863             runtime->silence_size > 0)
 864                 snd_pcm_playback_silence(substream, ULONG_MAX);
 865         if (substream->timer)
 866                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 867                                  &runtime->trigger_tstamp);
 868 }
 869
 870 static struct action_ops snd_pcm_action_start = {
 871         .pre_action = snd_pcm_pre_start,
 872         .do_action = snd_pcm_do_start,
 873         .undo_action = snd_pcm_undo_start,
 874         .post_action = snd_pcm_post_start
 875 };
 876
 877 /**
 878  * snd_pcm_start
 879  * @substream: the PCM substream instance
 880  *
 881  * Start all linked streams.
 882  */
 883 int snd_pcm_start(struct snd_pcm_substream *substream)
 884 {
 885         return snd_pcm_action(&snd_pcm_action_start, substream,
 886                               SNDRV_PCM_STATE_RUNNING);
 887 }
 888
 889 /*
 890  * stop callbacks
 891  */
 892 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 893 {
 894         struct snd_pcm_runtime *runtime = substream->runtime;
 895         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 896                 return -EBADFD;
 897         runtime->trigger_master = substream;
 898         return 0;
 899 }
 900
 901 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 902 {
 903         if (substream->runtime->trigger_master == substream &&
 904             snd_pcm_running(substream))
 905                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 906         return 0; /* unconditonally stop all substreams */
 907 }
 908
 909 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 910 {
 911         struct snd_pcm_runtime *runtime = substream->runtime;
 912         if (runtime->status->state != state) {
 913                 snd_pcm_trigger_tstamp(substream);
 914                 if (substream->timer)
 915                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 916                                          &runtime->trigger_tstamp);
 917                 runtime->status->state = state;
 918         }
 919         wake_up(&runtime->sleep);
 920 }
 921
 922 static struct action_ops snd_pcm_action_stop = {
 923         .pre_action = snd_pcm_pre_stop,
 924         .do_action = snd_pcm_do_stop,
 925         .post_action = snd_pcm_post_stop
 926 };
 927
 928 /**
 929  * snd_pcm_stop
 930  * @substream: the PCM substream instance
 931  * @state: PCM state after stopping the stream
 932  *
 933  * Try to stop all running streams in the substream group.
 934  * The state of each stream is changed to the given value after that unconditionally.
 935  */
 936 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 937 {
 938         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 939 }
 940
 941 EXPORT_SYMBOL(snd_pcm_stop);
 942
 943 /**
 944  * snd_pcm_drain_done
 945  * @substream: the PCM substream
 946  *
 947  * Stop the DMA only when the given stream is playback.
 948  * The state is changed to SETUP.
 949  * Unlike snd_pcm_stop(), this affects only the given stream.
 950  */
 951 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 952 {
 953         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 954                                      SNDRV_PCM_STATE_SETUP);
 955 }
 956
 957 /*
 958  * pause callbacks
 959  */
 960 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 961 {
 962         struct snd_pcm_runtime *runtime = substream->runtime;
 963         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 964                 return -ENOSYS;
 965         if (push) {
 966                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 967                         return -EBADFD;
 968         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 969                 return -EBADFD;
 970         runtime->trigger_master = substream;
 971         return 0;
 972 }
 973
 974 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 975 {
 976         if (substream->runtime->trigger_master != substream)
 977                 return 0;
 978         return substream->ops->trigger(substream,
 979                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 980                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 981 }
 982
 983 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 984 {
 985         if (substream->runtime->trigger_master == substream)
 986                 substream->ops->trigger(substream,
 987                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
 988                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 989 }
 990
 991 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
 992 {
 993         struct snd_pcm_runtime *runtime = substream->runtime;
 994         snd_pcm_trigger_tstamp(substream);
 995         if (push) {
 996                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
 997                 if (substream->timer)
 998                         snd_timer_notify(substream->timer,
 999                                          SNDRV_TIMER_EVENT_MPAUSE,
1000                                          &runtime->trigger_tstamp);
1001                 wake_up(&runtime->sleep);
1002         } else {
1003                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1004                 if (substream->timer)
1005                         snd_timer_notify(substream->timer,
1006                                          SNDRV_TIMER_EVENT_MCONTINUE,
1007                                          &runtime->trigger_tstamp);
1008         }
1009 }
1010
1011 static struct action_ops snd_pcm_action_pause = {
1012         .pre_action = snd_pcm_pre_pause,
1013         .do_action = snd_pcm_do_pause,
1014         .undo_action = snd_pcm_undo_pause,
1015         .post_action = snd_pcm_post_pause
1016 };
1017
1018 /*
1019  * Push/release the pause for all linked streams.
1020  */
1021 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1022 {
1023         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1024 }
1025
1026 #ifdef CONFIG_PM
1027 /* suspend */
1028
1029 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1030 {
1031         struct snd_pcm_runtime *runtime = substream->runtime;
1032         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1033                 return -EBUSY;
1034         runtime->trigger_master = substream;
1035         return 0;
1036 }
1037
1038 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1039 {
1040         struct snd_pcm_runtime *runtime = substream->runtime;
1041         if (runtime->trigger_master != substream)
1042                 return 0;
1043         if (! snd_pcm_running(substream))
1044                 return 0;
1045         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1046         return 0; /* suspend unconditionally */
1047 }
1048
1049 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1050 {
1051         struct snd_pcm_runtime *runtime = substream->runtime;
1052         snd_pcm_trigger_tstamp(substream);
1053         if (substream->timer)
1054                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1055                                  &runtime->trigger_tstamp);
1056         runtime->status->suspended_state = runtime->status->state;
1057         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1058         wake_up(&runtime->sleep);
1059 }
1060
1061 static struct action_ops snd_pcm_action_suspend = {
1062         .pre_action = snd_pcm_pre_suspend,
1063         .do_action = snd_pcm_do_suspend,
1064         .post_action = snd_pcm_post_suspend
1065 };
1066
1067 /**
1068  * snd_pcm_suspend
1069  * @substream: the PCM substream
1070  *
1071  * Trigger SUSPEND to all linked streams.
1072  * After this call, all streams are changed to SUSPENDED state.
1073  */
1074 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1075 {
1076         int err;
1077         unsigned long flags;
1078
1079         if (! substream)
1080                 return 0;
1081
1082         snd_pcm_stream_lock_irqsave(substream, flags);
1083         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1084         snd_pcm_stream_unlock_irqrestore(substream, flags);
1085         return err;
1086 }
1087
1088 EXPORT_SYMBOL(snd_pcm_suspend);
1089
1090 /**
1091  * snd_pcm_suspend_all
1092  * @pcm: the PCM instance
1093  *
1094  * Trigger SUSPEND to all substreams in the given pcm.
1095  * After this call, all streams are changed to SUSPENDED state.
1096  */
1097 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1098 {
1099         struct snd_pcm_substream *substream;
1100         int stream, err = 0;
1101
1102         if (! pcm)
1103                 return 0;
1104
1105         for (stream = 0; stream < 2; stream++) {
1106                 for (substream = pcm->streams[stream].substream;
1107                      substream; substream = substream->next) {
1108                         /* FIXME: the open/close code should lock this as well */
1109                         if (substream->runtime == NULL)
1110                                 continue;
1111                         err = snd_pcm_suspend(substream);
1112                         if (err < 0 && err != -EBUSY)
1113                                 return err;
1114                 }
1115         }
1116         return 0;
1117 }
1118
1119 EXPORT_SYMBOL(snd_pcm_suspend_all);
1120
1121 /* resume */
1122
1123 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1124 {
1125         struct snd_pcm_runtime *runtime = substream->runtime;
1126         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1127                 return -ENOSYS;
1128         runtime->trigger_master = substream;
1129         return 0;
1130 }
1131
1132 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1133 {
1134         struct snd_pcm_runtime *runtime = substream->runtime;
1135         if (runtime->trigger_master != substream)
1136                 return 0;
1137         /* DMA not running previously? */
1138         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1139             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1140              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1141                 return 0;
1142         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1143 }
1144
1145 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1146 {
1147         if (substream->runtime->trigger_master == substream &&
1148             snd_pcm_running(substream))
1149                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1150 }
1151
1152 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1153 {
1154         struct snd_pcm_runtime *runtime = substream->runtime;
1155         snd_pcm_trigger_tstamp(substream);
1156         if (substream->timer)
1157                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1158                                  &runtime->trigger_tstamp);
1159         runtime->status->state = runtime->status->suspended_state;
1160 }
1161
1162 static struct action_ops snd_pcm_action_resume = {
1163         .pre_action = snd_pcm_pre_resume,
1164         .do_action = snd_pcm_do_resume,
1165         .undo_action = snd_pcm_undo_resume,
1166         .post_action = snd_pcm_post_resume
1167 };
1168
1169 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1170 {
1171         struct snd_card *card = substream->pcm->card;
1172         int res;
1173
1174         snd_power_lock(card);
1175         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1176                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1177         snd_power_unlock(card);
1178         return res;
1179 }
1180
1181 #else
1182
1183 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1184 {
1185         return -ENOSYS;
1186 }
1187
1188 #endif /* CONFIG_PM */
1189
1190 /*
1191  * xrun ioctl
1192  *
1193  * Change the RUNNING stream(s) to XRUN state.
1194  */
1195 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1196 {
1197         struct snd_card *card = substream->pcm->card;
1198         struct snd_pcm_runtime *runtime = substream->runtime;
1199         int result;
1200
1201         snd_power_lock(card);
1202         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1203                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1204                 if (result < 0)
1205                         goto _unlock;
1206         }
1207
1208         snd_pcm_stream_lock_irq(substream);
1209         switch (runtime->status->state) {
1210         case SNDRV_PCM_STATE_XRUN:
1211                 result = 0;     /* already there */
1212                 break;
1213         case SNDRV_PCM_STATE_RUNNING:
1214                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1215                 break;
1216         default:
1217                 result = -EBADFD;
1218         }
1219         snd_pcm_stream_unlock_irq(substream);
1220  _unlock:
1221         snd_power_unlock(card);
1222         return result;
1223 }
1224
1225 /*
1226  * reset ioctl
1227  */
1228 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1229 {
1230         struct snd_pcm_runtime *runtime = substream->runtime;
1231         switch (runtime->status->state) {
1232         case SNDRV_PCM_STATE_RUNNING:
1233         case SNDRV_PCM_STATE_PREPARED:
1234         case SNDRV_PCM_STATE_PAUSED:
1235         case SNDRV_PCM_STATE_SUSPENDED:
1236                 return 0;
1237         default:
1238                 return -EBADFD;
1239         }
1240 }
1241
1242 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1243 {
1244         struct snd_pcm_runtime *runtime = substream->runtime;
1245         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1246         if (err < 0)
1247                 return err;
1248         runtime->hw_ptr_base = 0;
1249         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1250                 runtime->status->hw_ptr % runtime->period_size;
1251         runtime->silence_start = runtime->status->hw_ptr;
1252         runtime->silence_filled = 0;
1253         return 0;
1254 }
1255
1256 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1257 {
1258         struct snd_pcm_runtime *runtime = substream->runtime;
1259         runtime->control->appl_ptr = runtime->status->hw_ptr;
1260         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1261             runtime->silence_size > 0)
1262                 snd_pcm_playback_silence(substream, ULONG_MAX);
1263 }
1264
1265 static struct action_ops snd_pcm_action_reset = {
1266         .pre_action = snd_pcm_pre_reset,
1267         .do_action = snd_pcm_do_reset,
1268         .post_action = snd_pcm_post_reset
1269 };
1270
1271 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1272 {
1273         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1274 }
1275
1276 /*
1277  * prepare ioctl
1278  */
1279 /* we use the second argument for updating f_flags */
1280 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1281                                int f_flags)
1282 {
1283         struct snd_pcm_runtime *runtime = substream->runtime;
1284         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1285             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1286                 return -EBADFD;
1287         if (snd_pcm_running(substream))
1288                 return -EBUSY;
1289         substream->f_flags = f_flags;
1290         return 0;
1291 }
1292
1293 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1294 {
1295         int err;
1296         err = substream->ops->prepare(substream);
1297         if (err < 0)
1298                 return err;
1299         return snd_pcm_do_reset(substream, 0);
1300 }
1301
1302 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1303 {
1304         struct snd_pcm_runtime *runtime = substream->runtime;
1305         runtime->control->appl_ptr = runtime->status->hw_ptr;
1306         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1307 }
1308
1309 static struct action_ops snd_pcm_action_prepare = {
1310         .pre_action = snd_pcm_pre_prepare,
1311         .do_action = snd_pcm_do_prepare,
1312         .post_action = snd_pcm_post_prepare
1313 };
1314
1315 /**
1316  * snd_pcm_prepare
1317  * @substream: the PCM substream instance
1318  * @file: file to refer f_flags
1319  *
1320  * Prepare the PCM substream to be triggerable.
1321  */
1322 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1323                            struct file *file)
1324 {
1325         int res;
1326         struct snd_card *card = substream->pcm->card;
1327         int f_flags;
1328
1329         if (file)
1330                 f_flags = file->f_flags;
1331         else
1332                 f_flags = substream->f_flags;
1333
1334         snd_power_lock(card);
1335         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1336                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1337                                                substream, f_flags);
1338         snd_power_unlock(card);
1339         return res;
1340 }
1341
1342 /*
1343  * drain ioctl
1344  */
1345
1346 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1347 {
1348         if (substream->f_flags & O_NONBLOCK)
1349                 return -EAGAIN;
1350         substream->runtime->trigger_master = substream;
1351         return 0;
1352 }
1353
1354 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1355 {
1356         struct snd_pcm_runtime *runtime = substream->runtime;
1357         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1358                 switch (runtime->status->state) {
1359                 case SNDRV_PCM_STATE_PREPARED:
1360                         /* start playback stream if possible */
1361                         if (! snd_pcm_playback_empty(substream)) {
1362                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1363                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1364                         }
1365                         break;
1366                 case SNDRV_PCM_STATE_RUNNING:
1367                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1368                         break;
1369                 default:
1370                         break;
1371                 }
1372         } else {
1373                 /* stop running stream */
1374                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1375                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1376                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1377                         snd_pcm_do_stop(substream, new_state);
1378                         snd_pcm_post_stop(substream, new_state);
1379                 }
1380         }
1381         return 0;
1382 }
1383
1384 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1385 {
1386 }
1387
1388 static struct action_ops snd_pcm_action_drain_init = {
1389         .pre_action = snd_pcm_pre_drain_init,
1390         .do_action = snd_pcm_do_drain_init,
1391         .post_action = snd_pcm_post_drain_init
1392 };
1393
1394 struct drain_rec {
1395         struct snd_pcm_substream *substream;
1396         wait_queue_t wait;
1397         snd_pcm_uframes_t stop_threshold;
1398 };
1399
1400 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1401
1402 /*
1403  * Drain the stream(s).
1404  * When the substream is linked, sync until the draining of all playback streams
1405  * is finished.
1406  * After this call, all streams are supposed to be either SETUP or DRAINING
1407  * (capture only) state.
1408  */
1409 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1410 {
1411         struct snd_card *card;
1412         struct snd_pcm_runtime *runtime;
1413         struct snd_pcm_substream *s;
1414         int result = 0;
1415         int i, num_drecs;
1416         struct drain_rec *drec, drec_tmp, *d;
1417
1418         card = substream->pcm->card;
1419         runtime = substream->runtime;
1420
1421         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1422                 return -EBADFD;
1423
1424         snd_power_lock(card);
1425         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1426                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1427                 if (result < 0) {
1428                         snd_power_unlock(card);
1429                         return result;
1430                 }
1431         }
1432
1433         /* allocate temporary record for drain sync */
1434         down_read(&snd_pcm_link_rwsem);
1435         if (snd_pcm_stream_linked(substream)) {
1436                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1437                 if (! drec) {
1438                         up_read(&snd_pcm_link_rwsem);
1439                         snd_power_unlock(card);
1440                         return -ENOMEM;
1441                 }
1442         } else
1443                 drec = &drec_tmp;
1444
1445         /* count only playback streams */
1446         num_drecs = 0;
1447         snd_pcm_group_for_each_entry(s, substream) {
1448                 runtime = s->runtime;
1449                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1450                         d = &drec[num_drecs++];
1451                         d->substream = s;
1452                         init_waitqueue_entry(&d->wait, current);
1453                         add_wait_queue(&runtime->sleep, &d->wait);
1454                         /* stop_threshold fixup to avoid endless loop when
1455                          * stop_threshold > buffer_size
1456                          */
1457                         d->stop_threshold = runtime->stop_threshold;
1458                         if (runtime->stop_threshold > runtime->buffer_size)
1459                                 runtime->stop_threshold = runtime->buffer_size;
1460                 }
1461         }
1462         up_read(&snd_pcm_link_rwsem);
1463
1464         snd_pcm_stream_lock_irq(substream);
1465         /* resume pause */
1466         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1467                 snd_pcm_pause(substream, 0);
1468
1469         /* pre-start/stop - all running streams are changed to DRAINING state */
1470         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1471         if (result < 0) {
1472                 snd_pcm_stream_unlock_irq(substream);
1473                 goto _error;
1474         }
1475
1476         for (;;) {
1477                 long tout;
1478                 if (signal_pending(current)) {
1479                         result = -ERESTARTSYS;
1480                         break;
1481                 }
1482                 /* all finished? */
1483                 for (i = 0; i < num_drecs; i++) {
1484                         runtime = drec[i].substream->runtime;
1485                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1486                                 break;
1487                 }
1488                 if (i == num_drecs)
1489                         break; /* yes, all drained */
1490
1491                 set_current_state(TASK_INTERRUPTIBLE);
1492                 snd_pcm_stream_unlock_irq(substream);
1493                 snd_power_unlock(card);
1494                 tout = schedule_timeout(10 * HZ);
1495                 snd_power_lock(card);
1496                 snd_pcm_stream_lock_irq(substream);
1497                 if (tout == 0) {
1498                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1499                                 result = -ESTRPIPE;
1500                         else {
1501                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1502                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1503                                 result = -EIO;
1504                         }
1505                         break;
1506                 }
1507         }
1508
1509         snd_pcm_stream_unlock_irq(substream);
1510
1511  _error:
1512         for (i = 0; i < num_drecs; i++) {
1513                 d = &drec[i];
1514                 runtime = d->substream->runtime;
1515                 remove_wait_queue(&runtime->sleep, &d->wait);
1516                 runtime->stop_threshold = d->stop_threshold;
1517         }
1518
1519         if (drec != &drec_tmp)
1520                 kfree(drec);
1521         snd_power_unlock(card);
1522
1523         return result;
1524 }
1525
1526 /*
1527  * drop ioctl
1528  *
1529  * Immediately put all linked substreams into SETUP state.
1530  */
1531 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1532 {
1533         struct snd_pcm_runtime *runtime;
1534         struct snd_card *card;
1535         int result = 0;
1536
1537         if (PCM_RUNTIME_CHECK(substream))
1538                 return -ENXIO;
1539         runtime = substream->runtime;
1540         card = substream->pcm->card;
1541
1542         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1543             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1544             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1545                 return -EBADFD;
1546
1547         snd_pcm_stream_lock_irq(substream);
1548         /* resume pause */
1549         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1550                 snd_pcm_pause(substream, 0);
1551
1552         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1553         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1554         snd_pcm_stream_unlock_irq(substream);
1555
1556         return result;
1557 }
1558
1559
1560 /* WARNING: Don't forget to fput back the file */
1561 static struct file *snd_pcm_file_fd(int fd)
1562 {
1563         struct file *file;
1564         struct inode *inode;
1565         unsigned int minor;
1566
1567         file = fget(fd);
1568         if (!file)
1569                 return NULL;
1570         inode = file->f_path.dentry->d_inode;
1571         if (!S_ISCHR(inode->i_mode) ||
1572             imajor(inode) != snd_major) {
1573                 fput(file);
1574                 return NULL;
1575         }
1576         minor = iminor(inode);
1577         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1578             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1579                 fput(file);
1580                 return NULL;
1581         }
1582         return file;
1583 }
1584
1585 /*
1586  * PCM link handling
1587  */
1588 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1589 {
1590         int res = 0;
1591         struct file *file;
1592         struct snd_pcm_file *pcm_file;
1593         struct snd_pcm_substream *substream1;
1594
1595         file = snd_pcm_file_fd(fd);
1596         if (!file)
1597                 return -EBADFD;
1598         pcm_file = file->private_data;
1599         substream1 = pcm_file->substream;
1600         down_write(&snd_pcm_link_rwsem);
1601         write_lock_irq(&snd_pcm_link_rwlock);
1602         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1603             substream->runtime->status->state != substream1->runtime->status->state) {
1604                 res = -EBADFD;
1605                 goto _end;
1606         }
1607         if (snd_pcm_stream_linked(substream1)) {
1608                 res = -EALREADY;
1609                 goto _end;
1610         }
1611         if (!snd_pcm_stream_linked(substream)) {
1612                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1613                 if (substream->group == NULL) {
1614                         res = -ENOMEM;
1615                         goto _end;
1616                 }
1617                 spin_lock_init(&substream->group->lock);
1618                 INIT_LIST_HEAD(&substream->group->substreams);
1619                 list_add_tail(&substream->link_list, &substream->group->substreams);
1620                 substream->group->count = 1;
1621         }
1622         list_add_tail(&substream1->link_list, &substream->group->substreams);
1623         substream->group->count++;
1624         substream1->group = substream->group;
1625  _end:
1626         write_unlock_irq(&snd_pcm_link_rwlock);
1627         up_write(&snd_pcm_link_rwsem);
1628         fput(file);
1629         return res;
1630 }
1631
1632 static void relink_to_local(struct snd_pcm_substream *substream)
1633 {
1634         substream->group = &substream->self_group;
1635         INIT_LIST_HEAD(&substream->self_group.substreams);
1636         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1637 }
1638
1639 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1640 {
1641         struct snd_pcm_substream *s;
1642         int res = 0;
1643
1644         down_write(&snd_pcm_link_rwsem);
1645         write_lock_irq(&snd_pcm_link_rwlock);
1646         if (!snd_pcm_stream_linked(substream)) {
1647                 res = -EALREADY;
1648                 goto _end;
1649         }
1650         list_del(&substream->link_list);
1651         substream->group->count--;
1652         if (substream->group->count == 1) {     /* detach the last stream, too */
1653                 snd_pcm_group_for_each_entry(s, substream) {
1654                         relink_to_local(s);
1655                         break;
1656                 }
1657                 kfree(substream->group);
1658         }
1659         relink_to_local(substream);
1660        _end:
1661         write_unlock_irq(&snd_pcm_link_rwlock);
1662         up_write(&snd_pcm_link_rwsem);
1663         return res;
1664 }
1665
1666 /*
1667  * hw configurator
1668  */
1669 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1670                                struct snd_pcm_hw_rule *rule)
1671 {
1672         struct snd_interval t;
1673         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1674                      hw_param_interval_c(params, rule->deps[1]), &t);
1675         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1676 }
1677
1678 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1679                                struct snd_pcm_hw_rule *rule)
1680 {
1681         struct snd_interval t;
1682         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1683                      hw_param_interval_c(params, rule->deps[1]), &t);
1684         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1685 }
1686
1687 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1688                                    struct snd_pcm_hw_rule *rule)
1689 {
1690         struct snd_interval t;
1691         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1692                          hw_param_interval_c(params, rule->deps[1]),
1693                          (unsigned long) rule->private, &t);
1694         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1695 }
1696
1697 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1698                                    struct snd_pcm_hw_rule *rule)
1699 {
1700         struct snd_interval t;
1701         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1702                          (unsigned long) rule->private,
1703                          hw_param_interval_c(params, rule->deps[1]), &t);
1704         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1705 }
1706
1707 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1708                                   struct snd_pcm_hw_rule *rule)
1709 {
1710         unsigned int k;
1711         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1712         struct snd_mask m;
1713         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1714         snd_mask_any(&m);
1715         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1716                 int bits;
1717                 if (! snd_mask_test(mask, k))
1718                         continue;
1719                 bits = snd_pcm_format_physical_width(k);
1720                 if (bits <= 0)
1721                         continue; /* ignore invalid formats */
1722                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1723                         snd_mask_reset(&m, k);
1724         }
1725         return snd_mask_refine(mask, &m);
1726 }
1727
1728 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1729                                        struct snd_pcm_hw_rule *rule)
1730 {
1731         struct snd_interval t;
1732         unsigned int k;
1733         t.min = UINT_MAX;
1734         t.max = 0;
1735         t.openmin = 0;
1736         t.openmax = 0;
1737         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1738                 int bits;
1739                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1740                         continue;
1741                 bits = snd_pcm_format_physical_width(k);
1742                 if (bits <= 0)
1743                         continue; /* ignore invalid formats */
1744                 if (t.min > (unsigned)bits)
1745                         t.min = bits;
1746                 if (t.max < (unsigned)bits)
1747                         t.max = bits;
1748         }
1749         t.integer = 1;
1750         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1751 }
1752
1753 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1754 #error "Change this table"
1755 #endif
1756
1757 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1758                                  48000, 64000, 88200, 96000, 176400, 192000 };
1759
1760 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1761         .count = ARRAY_SIZE(rates),
1762         .list = rates,
1763 };
1764
1765 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1766                                 struct snd_pcm_hw_rule *rule)
1767 {
1768         struct snd_pcm_hardware *hw = rule->private;
1769         return snd_interval_list(hw_param_interval(params, rule->var),
1770                                  snd_pcm_known_rates.count,
1771                                  snd_pcm_known_rates.list, hw->rates);
1772 }
1773
1774 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1775                                             struct snd_pcm_hw_rule *rule)
1776 {
1777         struct snd_interval t;
1778         struct snd_pcm_substream *substream = rule->private;
1779         t.min = 0;
1780         t.max = substream->buffer_bytes_max;
1781         t.openmin = 0;
1782         t.openmax = 0;
1783         t.integer = 1;
1784         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1785 }
1786
1787 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1788 {
1789         struct snd_pcm_runtime *runtime = substream->runtime;
1790         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1791         int k, err;
1792
1793         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1794                 snd_mask_any(constrs_mask(constrs, k));
1795         }
1796
1797         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1798                 snd_interval_any(constrs_interval(constrs, k));
1799         }
1800
1801         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1802         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1803         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1804         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1805         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1806
1807         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1808                                    snd_pcm_hw_rule_format, NULL,
1809                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1810         if (err < 0)
1811                 return err;
1812         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1813                                   snd_pcm_hw_rule_sample_bits, NULL,
1814                                   SNDRV_PCM_HW_PARAM_FORMAT,
1815                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1816         if (err < 0)
1817                 return err;
1818         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1819                                   snd_pcm_hw_rule_div, NULL,
1820                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1821         if (err < 0)
1822                 return err;
1823         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1824                                   snd_pcm_hw_rule_mul, NULL,
1825                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1826         if (err < 0)
1827                 return err;
1828         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1829                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1830                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1831         if (err < 0)
1832                 return err;
1833         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1834                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1835                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1836         if (err < 0)
1837                 return err;
1838         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1839                                   snd_pcm_hw_rule_div, NULL,
1840                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1841         if (err < 0)
1842                 return err;
1843         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1844                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1845                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1849                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1850                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1854                                   snd_pcm_hw_rule_div, NULL,
1855                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1859                                   snd_pcm_hw_rule_div, NULL,
1860                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1864                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1865                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1869                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1870                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1874                                   snd_pcm_hw_rule_mul, NULL,
1875                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1879                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1880                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1884                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1885                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1889                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1890                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1891         if (err < 0)
1892                 return err;
1893         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1894                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1895                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1899                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1900                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1904                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1905                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1906         if (err < 0)
1907                 return err;
1908         return 0;
1909 }
1910
1911 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1912 {
1913         struct snd_pcm_runtime *runtime = substream->runtime;
1914         struct snd_pcm_hardware *hw = &runtime->hw;
1915         int err;
1916         unsigned int mask = 0;
1917
1918         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1919                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1920         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1921                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1922         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1923                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1924                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1925                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1926                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1927                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1928                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1929         }
1930         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1931         if (err < 0)
1932                 return err;
1933
1934         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1935         if (err < 0)
1936                 return err;
1937
1938         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1939         if (err < 0)
1940                 return err;
1941
1942         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1943                                            hw->channels_min, hw->channels_max);
1944         if (err < 0)
1945                 return err;
1946
1947         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1948                                            hw->rate_min, hw->rate_max);
1949          if (err < 0)
1950                  return err;
1951
1952         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1953                                            hw->period_bytes_min, hw->period_bytes_max);
1954          if (err < 0)
1955                  return err;
1956
1957         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1958                                            hw->periods_min, hw->periods_max);
1959         if (err < 0)
1960                 return err;
1961
1962         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1963                                            hw->period_bytes_min, hw->buffer_bytes_max);
1964         if (err < 0)
1965                 return err;
1966
1967         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1968                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1969                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1970         if (err < 0)
1971                 return err;
1972
1973         /* FIXME: remove */
1974         if (runtime->dma_bytes) {
1975                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1976                 if (err < 0)
1977                         return -EINVAL;
1978         }
1979
1980         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1981                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1982                                           snd_pcm_hw_rule_rate, hw,
1983                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1984                 if (err < 0)
1985                         return err;
1986         }
1987
1988         /* FIXME: this belong to lowlevel */
1989         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1990
1991         return 0;
1992 }
1993
1994 static void pcm_release_private(struct snd_pcm_substream *substream)
1995 {
1996         snd_pcm_unlink(substream);
1997 }
1998
1999 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2000 {
2001         substream->ref_count--;
2002         if (substream->ref_count > 0)
2003                 return;
2004
2005         snd_pcm_drop(substream);
2006         if (substream->hw_opened) {
2007                 if (substream->ops->hw_free != NULL)
2008                         substream->ops->hw_free(substream);
2009                 substream->ops->close(substream);
2010                 substream->hw_opened = 0;
2011         }
2012         if (substream->pcm_release) {
2013                 substream->pcm_release(substream);
2014                 substream->pcm_release = NULL;
2015         }
2016         snd_pcm_detach_substream(substream);
2017 }
2018
2019 EXPORT_SYMBOL(snd_pcm_release_substream);
2020
2021 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2022                            struct file *file,
2023                            struct snd_pcm_substream **rsubstream)
2024 {
2025         struct snd_pcm_substream *substream;
2026         int err;
2027
2028         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2029         if (err < 0)
2030                 return err;
2031         if (substream->ref_count > 1) {
2032                 *rsubstream = substream;
2033                 return 0;
2034         }
2035
2036         err = snd_pcm_hw_constraints_init(substream);
2037         if (err < 0) {
2038                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2039                 goto error;
2040         }
2041
2042         if ((err = substream->ops->open(substream)) < 0)
2043                 goto error;
2044
2045         substream->hw_opened = 1;
2046
2047         err = snd_pcm_hw_constraints_complete(substream);
2048         if (err < 0) {
2049                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2050                 goto error;
2051         }
2052
2053         *rsubstream = substream;
2054         return 0;
2055
2056  error:
2057         snd_pcm_release_substream(substream);
2058         return err;
2059 }
2060
2061 EXPORT_SYMBOL(snd_pcm_open_substream);
2062
2063 static int snd_pcm_open_file(struct file *file,
2064                              struct snd_pcm *pcm,
2065                              int stream,
2066                              struct snd_pcm_file **rpcm_file)
2067 {
2068         struct snd_pcm_file *pcm_file;
2069         struct snd_pcm_substream *substream;
2070         struct snd_pcm_str *str;
2071         int err;
2072
2073         if (rpcm_file)
2074                 *rpcm_file = NULL;
2075
2076         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2077         if (err < 0)
2078                 return err;
2079
2080         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2081         if (pcm_file == NULL) {
2082                 snd_pcm_release_substream(substream);
2083                 return -ENOMEM;
2084         }
2085         pcm_file->substream = substream;
2086         if (substream->ref_count == 1) {
2087                 str = substream->pstr;
2088                 substream->file = pcm_file;
2089                 substream->pcm_release = pcm_release_private;
2090         }
2091         file->private_data = pcm_file;
2092         if (rpcm_file)
2093                 *rpcm_file = pcm_file;
2094         return 0;
2095 }
2096
2097 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2098 {
2099         struct snd_pcm *pcm;
2100
2101         pcm = snd_lookup_minor_data(iminor(inode),
2102                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2103         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2104 }
2105
2106 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2107 {
2108         struct snd_pcm *pcm;
2109
2110         pcm = snd_lookup_minor_data(iminor(inode),
2111                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2112         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2113 }
2114
2115 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2116 {
2117         int err;
2118         struct snd_pcm_file *pcm_file;
2119         wait_queue_t wait;
2120
2121         if (pcm == NULL) {
2122                 err = -ENODEV;
2123                 goto __error1;
2124         }
2125         err = snd_card_file_add(pcm->card, file);
2126         if (err < 0)
2127                 goto __error1;
2128         if (!try_module_get(pcm->card->module)) {
2129                 err = -EFAULT;
2130                 goto __error2;
2131         }
2132         init_waitqueue_entry(&wait, current);
2133         add_wait_queue(&pcm->open_wait, &wait);
2134         mutex_lock(&pcm->open_mutex);
2135         while (1) {
2136                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2137                 if (err >= 0)
2138                         break;
2139                 if (err == -EAGAIN) {
2140                         if (file->f_flags & O_NONBLOCK) {
2141                                 err = -EBUSY;
2142                                 break;
2143                         }
2144                 } else
2145                         break;
2146                 set_current_state(TASK_INTERRUPTIBLE);
2147                 mutex_unlock(&pcm->open_mutex);
2148                 schedule();
2149                 mutex_lock(&pcm->open_mutex);
2150                 if (signal_pending(current)) {
2151                         err = -ERESTARTSYS;
2152                         break;
2153                 }
2154         }
2155         remove_wait_queue(&pcm->open_wait, &wait);
2156         mutex_unlock(&pcm->open_mutex);
2157         if (err < 0)
2158                 goto __error;
2159         return err;
2160
2161       __error:
2162         module_put(pcm->card->module);
2163       __error2:
2164         snd_card_file_remove(pcm->card, file);
2165       __error1:
2166         return err;
2167 }
2168
2169 static int snd_pcm_release(struct inode *inode, struct file *file)
2170 {
2171         struct snd_pcm *pcm;
2172         struct snd_pcm_substream *substream;
2173         struct snd_pcm_file *pcm_file;
2174
2175         pcm_file = file->private_data;
2176         substream = pcm_file->substream;
2177         if (snd_BUG_ON(!substream))
2178                 return -ENXIO;
2179         pcm = substream->pcm;
2180         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2181         mutex_lock(&pcm->open_mutex);
2182         snd_pcm_release_substream(substream);
2183         kfree(pcm_file);
2184         mutex_unlock(&pcm->open_mutex);
2185         wake_up(&pcm->open_wait);
2186         module_put(pcm->card->module);
2187         snd_card_file_remove(pcm->card, file);
2188         return 0;
2189 }
2190
2191 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2192                                                  snd_pcm_uframes_t frames)
2193 {
2194         struct snd_pcm_runtime *runtime = substream->runtime;
2195         snd_pcm_sframes_t appl_ptr;
2196         snd_pcm_sframes_t ret;
2197         snd_pcm_sframes_t hw_avail;
2198
2199         if (frames == 0)
2200                 return 0;
2201
2202         snd_pcm_stream_lock_irq(substream);
2203         switch (runtime->status->state) {
2204         case SNDRV_PCM_STATE_PREPARED:
2205                 break;
2206         case SNDRV_PCM_STATE_DRAINING:
2207         case SNDRV_PCM_STATE_RUNNING:
2208                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2209                         break;
2210                 /* Fall through */
2211         case SNDRV_PCM_STATE_XRUN:
2212                 ret = -EPIPE;
2213                 goto __end;
2214         default:
2215                 ret = -EBADFD;
2216                 goto __end;
2217         }
2218
2219         hw_avail = snd_pcm_playback_hw_avail(runtime);
2220         if (hw_avail <= 0) {
2221                 ret = 0;
2222                 goto __end;
2223         }
2224         if (frames > (snd_pcm_uframes_t)hw_avail)
2225                 frames = hw_avail;
2226         appl_ptr = runtime->control->appl_ptr - frames;
2227         if (appl_ptr < 0)
2228                 appl_ptr += runtime->boundary;
2229         runtime->control->appl_ptr = appl_ptr;
2230         ret = frames;
2231  __end:
2232         snd_pcm_stream_unlock_irq(substream);
2233         return ret;
2234 }
2235
2236 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2237                                                 snd_pcm_uframes_t frames)
2238 {
2239         struct snd_pcm_runtime *runtime = substream->runtime;
2240         snd_pcm_sframes_t appl_ptr;
2241         snd_pcm_sframes_t ret;
2242         snd_pcm_sframes_t hw_avail;
2243
2244         if (frames == 0)
2245                 return 0;
2246
2247         snd_pcm_stream_lock_irq(substream);
2248         switch (runtime->status->state) {
2249         case SNDRV_PCM_STATE_PREPARED:
2250         case SNDRV_PCM_STATE_DRAINING:
2251                 break;
2252         case SNDRV_PCM_STATE_RUNNING:
2253                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2254                         break;
2255                 /* Fall through */
2256         case SNDRV_PCM_STATE_XRUN:
2257                 ret = -EPIPE;
2258                 goto __end;
2259         default:
2260                 ret = -EBADFD;
2261                 goto __end;
2262         }
2263
2264         hw_avail = snd_pcm_capture_hw_avail(runtime);
2265         if (hw_avail <= 0) {
2266                 ret = 0;
2267                 goto __end;
2268         }
2269         if (frames > (snd_pcm_uframes_t)hw_avail)
2270                 frames = hw_avail;
2271         appl_ptr = runtime->control->appl_ptr - frames;
2272         if (appl_ptr < 0)
2273                 appl_ptr += runtime->boundary;
2274         runtime->control->appl_ptr = appl_ptr;
2275         ret = frames;
2276  __end:
2277         snd_pcm_stream_unlock_irq(substream);
2278         return ret;
2279 }
2280
2281 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2282                                                   snd_pcm_uframes_t frames)
2283 {
2284         struct snd_pcm_runtime *runtime = substream->runtime;
2285         snd_pcm_sframes_t appl_ptr;
2286         snd_pcm_sframes_t ret;
2287         snd_pcm_sframes_t avail;
2288
2289         if (frames == 0)
2290                 return 0;
2291
2292         snd_pcm_stream_lock_irq(substream);
2293         switch (runtime->status->state) {
2294         case SNDRV_PCM_STATE_PREPARED:
2295         case SNDRV_PCM_STATE_PAUSED:
2296                 break;
2297         case SNDRV_PCM_STATE_DRAINING:
2298         case SNDRV_PCM_STATE_RUNNING:
2299                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2300                         break;
2301                 /* Fall through */
2302         case SNDRV_PCM_STATE_XRUN:
2303                 ret = -EPIPE;
2304                 goto __end;
2305         default:
2306                 ret = -EBADFD;
2307                 goto __end;
2308         }
2309
2310         avail = snd_pcm_playback_avail(runtime);
2311         if (avail <= 0) {
2312                 ret = 0;
2313                 goto __end;
2314         }
2315         if (frames > (snd_pcm_uframes_t)avail)
2316                 frames = avail;
2317         appl_ptr = runtime->control->appl_ptr + frames;
2318         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2319                 appl_ptr -= runtime->boundary;
2320         runtime->control->appl_ptr = appl_ptr;
2321         ret = frames;
2322  __end:
2323         snd_pcm_stream_unlock_irq(substream);
2324         return ret;
2325 }
2326
2327 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2328                                                  snd_pcm_uframes_t frames)
2329 {
2330         struct snd_pcm_runtime *runtime = substream->runtime;
2331         snd_pcm_sframes_t appl_ptr;
2332         snd_pcm_sframes_t ret;
2333         snd_pcm_sframes_t avail;
2334
2335         if (frames == 0)
2336                 return 0;
2337
2338         snd_pcm_stream_lock_irq(substream);
2339         switch (runtime->status->state) {
2340         case SNDRV_PCM_STATE_PREPARED:
2341         case SNDRV_PCM_STATE_DRAINING:
2342         case SNDRV_PCM_STATE_PAUSED:
2343                 break;
2344         case SNDRV_PCM_STATE_RUNNING:
2345                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2346                         break;
2347                 /* Fall through */
2348         case SNDRV_PCM_STATE_XRUN:
2349                 ret = -EPIPE;
2350                 goto __end;
2351         default:
2352                 ret = -EBADFD;
2353                 goto __end;
2354         }
2355
2356         avail = snd_pcm_capture_avail(runtime);
2357         if (avail <= 0) {
2358                 ret = 0;
2359                 goto __end;
2360         }
2361         if (frames > (snd_pcm_uframes_t)avail)
2362                 frames = avail;
2363         appl_ptr = runtime->control->appl_ptr + frames;
2364         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2365                 appl_ptr -= runtime->boundary;
2366         runtime->control->appl_ptr = appl_ptr;
2367         ret = frames;
2368  __end:
2369         snd_pcm_stream_unlock_irq(substream);
2370         return ret;
2371 }
2372
2373 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2374 {
2375         struct snd_pcm_runtime *runtime = substream->runtime;
2376         int err;
2377
2378         snd_pcm_stream_lock_irq(substream);
2379         switch (runtime->status->state) {
2380         case SNDRV_PCM_STATE_DRAINING:
2381                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2382                         goto __badfd;
2383         case SNDRV_PCM_STATE_RUNNING:
2384                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2385                         break;
2386                 /* Fall through */
2387         case SNDRV_PCM_STATE_PREPARED:
2388         case SNDRV_PCM_STATE_SUSPENDED:
2389                 err = 0;
2390                 break;
2391         case SNDRV_PCM_STATE_XRUN:
2392                 err = -EPIPE;
2393                 break;
2394         default:
2395               __badfd:
2396                 err = -EBADFD;
2397                 break;
2398         }
2399         snd_pcm_stream_unlock_irq(substream);
2400         return err;
2401 }
2402
2403 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2404                          snd_pcm_sframes_t __user *res)
2405 {
2406         struct snd_pcm_runtime *runtime = substream->runtime;
2407         int err;
2408         snd_pcm_sframes_t n = 0;
2409
2410         snd_pcm_stream_lock_irq(substream);
2411         switch (runtime->status->state) {
2412         case SNDRV_PCM_STATE_DRAINING:
2413                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2414                         goto __badfd;
2415         case SNDRV_PCM_STATE_RUNNING:
2416                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2417                         break;
2418                 /* Fall through */
2419         case SNDRV_PCM_STATE_PREPARED:
2420         case SNDRV_PCM_STATE_SUSPENDED:
2421                 err = 0;
2422                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2423                         n = snd_pcm_playback_hw_avail(runtime);
2424                 else
2425                         n = snd_pcm_capture_avail(runtime);
2426                 break;
2427         case SNDRV_PCM_STATE_XRUN:
2428                 err = -EPIPE;
2429                 break;
2430         default:
2431               __badfd:
2432                 err = -EBADFD;
2433                 break;
2434         }
2435         snd_pcm_stream_unlock_irq(substream);
2436         if (!err)
2437                 if (put_user(n, res))
2438                         err = -EFAULT;
2439         return err;
2440 }
2441
2442 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2443                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2444 {
2445         struct snd_pcm_runtime *runtime = substream->runtime;
2446         struct snd_pcm_sync_ptr sync_ptr;
2447         volatile struct snd_pcm_mmap_status *status;
2448         volatile struct snd_pcm_mmap_control *control;
2449         int err;
2450
2451         memset(&sync_ptr, 0, sizeof(sync_ptr));
2452         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2453                 return -EFAULT;
2454         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2455                 return -EFAULT;
2456         status = runtime->status;
2457         control = runtime->control;
2458         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2459                 err = snd_pcm_hwsync(substream);
2460                 if (err < 0)
2461                         return err;
2462         }
2463         snd_pcm_stream_lock_irq(substream);
2464         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2465                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2466         else
2467                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2468         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2469                 control->avail_min = sync_ptr.c.control.avail_min;
2470         else
2471                 sync_ptr.c.control.avail_min = control->avail_min;
2472         sync_ptr.s.status.state = status->state;
2473         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2474         sync_ptr.s.status.tstamp = status->tstamp;
2475         sync_ptr.s.status.suspended_state = status->suspended_state;
2476         snd_pcm_stream_unlock_irq(substream);
2477         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2478                 return -EFAULT;
2479         return 0;
2480 }
2481
2482 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2483 {
2484         struct snd_pcm_runtime *runtime = substream->runtime;
2485         int arg;
2486
2487         if (get_user(arg, _arg))
2488                 return -EFAULT;
2489         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2490                 return -EINVAL;
2491         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2492         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2493                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2494         return 0;
2495 }
2496
2497 static int snd_pcm_common_ioctl1(struct file *file,
2498                                  struct snd_pcm_substream *substream,
2499                                  unsigned int cmd, void __user *arg)
2500 {
2501         switch (cmd) {
2502         case SNDRV_PCM_IOCTL_PVERSION:
2503                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2504         case SNDRV_PCM_IOCTL_INFO:
2505                 return snd_pcm_info_user(substream, arg);
2506         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2507                 return 0;
2508         case SNDRV_PCM_IOCTL_TTSTAMP:
2509                 return snd_pcm_tstamp(substream, arg);
2510         case SNDRV_PCM_IOCTL_HW_REFINE:
2511                 return snd_pcm_hw_refine_user(substream, arg);
2512         case SNDRV_PCM_IOCTL_HW_PARAMS:
2513                 return snd_pcm_hw_params_user(substream, arg);
2514         case SNDRV_PCM_IOCTL_HW_FREE:
2515                 return snd_pcm_hw_free(substream);
2516         case SNDRV_PCM_IOCTL_SW_PARAMS:
2517                 return snd_pcm_sw_params_user(substream, arg);
2518         case SNDRV_PCM_IOCTL_STATUS:
2519                 return snd_pcm_status_user(substream, arg);
2520         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2521                 return snd_pcm_channel_info_user(substream, arg);
2522         case SNDRV_PCM_IOCTL_PREPARE:
2523                 return snd_pcm_prepare(substream, file);
2524         case SNDRV_PCM_IOCTL_RESET:
2525                 return snd_pcm_reset(substream);
2526         case SNDRV_PCM_IOCTL_START:
2527                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2528         case SNDRV_PCM_IOCTL_LINK:
2529                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2530         case SNDRV_PCM_IOCTL_UNLINK:
2531                 return snd_pcm_unlink(substream);
2532         case SNDRV_PCM_IOCTL_RESUME:
2533                 return snd_pcm_resume(substream);
2534         case SNDRV_PCM_IOCTL_XRUN:
2535                 return snd_pcm_xrun(substream);
2536         case SNDRV_PCM_IOCTL_HWSYNC:
2537                 return snd_pcm_hwsync(substream);
2538         case SNDRV_PCM_IOCTL_DELAY:
2539                 return snd_pcm_delay(substream, arg);
2540         case SNDRV_PCM_IOCTL_SYNC_PTR:
2541                 return snd_pcm_sync_ptr(substream, arg);
2542 #ifdef CONFIG_SND_SUPPORT_OLD_API
2543         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2544                 return snd_pcm_hw_refine_old_user(substream, arg);
2545         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2546                 return snd_pcm_hw_params_old_user(substream, arg);
2547 #endif
2548         case SNDRV_PCM_IOCTL_DRAIN:
2549                 return snd_pcm_drain(substream);
2550         case SNDRV_PCM_IOCTL_DROP:
2551                 return snd_pcm_drop(substream);
2552         case SNDRV_PCM_IOCTL_PAUSE:
2553         {
2554                 int res;
2555                 snd_pcm_stream_lock_irq(substream);
2556                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2557                 snd_pcm_stream_unlock_irq(substream);
2558                 return res;
2559         }
2560         }
2561         snd_printd("unknown ioctl = 0x%x\n", cmd);
2562         return -ENOTTY;
2563 }
2564
2565 static int snd_pcm_playback_ioctl1(struct file *file,
2566                                    struct snd_pcm_substream *substream,
2567                                    unsigned int cmd, void __user *arg)
2568 {
2569         if (snd_BUG_ON(!substream))
2570                 return -ENXIO;
2571         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2572                 return -EINVAL;
2573         switch (cmd) {
2574         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2575         {
2576                 struct snd_xferi xferi;
2577                 struct snd_xferi __user *_xferi = arg;
2578                 struct snd_pcm_runtime *runtime = substream->runtime;
2579                 snd_pcm_sframes_t result;
2580                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2581                         return -EBADFD;
2582                 if (put_user(0, &_xferi->result))
2583                         return -EFAULT;
2584                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2585                         return -EFAULT;
2586                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2587                 __put_user(result, &_xferi->result);
2588                 return result < 0 ? result : 0;
2589         }
2590         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2591         {
2592                 struct snd_xfern xfern;
2593                 struct snd_xfern __user *_xfern = arg;
2594                 struct snd_pcm_runtime *runtime = substream->runtime;
2595                 void __user **bufs;
2596                 snd_pcm_sframes_t result;
2597                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2598                         return -EBADFD;
2599                 if (runtime->channels > 128)
2600                         return -EINVAL;
2601                 if (put_user(0, &_xfern->result))
2602                         return -EFAULT;
2603                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2604                         return -EFAULT;
2605                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2606                 if (bufs == NULL)
2607                         return -ENOMEM;
2608                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2609                         kfree(bufs);
2610                         return -EFAULT;
2611                 }
2612                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2613                 kfree(bufs);
2614                 __put_user(result, &_xfern->result);
2615                 return result < 0 ? result : 0;
2616         }
2617         case SNDRV_PCM_IOCTL_REWIND:
2618         {
2619                 snd_pcm_uframes_t frames;
2620                 snd_pcm_uframes_t __user *_frames = arg;
2621                 snd_pcm_sframes_t result;
2622                 if (get_user(frames, _frames))
2623                         return -EFAULT;
2624                 if (put_user(0, _frames))
2625                         return -EFAULT;
2626                 result = snd_pcm_playback_rewind(substream, frames);
2627                 __put_user(result, _frames);
2628                 return result < 0 ? result : 0;
2629         }
2630         case SNDRV_PCM_IOCTL_FORWARD:
2631         {
2632                 snd_pcm_uframes_t frames;
2633                 snd_pcm_uframes_t __user *_frames = arg;
2634                 snd_pcm_sframes_t result;
2635                 if (get_user(frames, _frames))
2636                         return -EFAULT;
2637                 if (put_user(0, _frames))
2638                         return -EFAULT;
2639                 result = snd_pcm_playback_forward(substream, frames);
2640                 __put_user(result, _frames);
2641                 return result < 0 ? result : 0;
2642         }
2643         }
2644         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2645 }
2646
2647 static int snd_pcm_capture_ioctl1(struct file *file,
2648                                   struct snd_pcm_substream *substream,
2649                                   unsigned int cmd, void __user *arg)
2650 {
2651         if (snd_BUG_ON(!substream))
2652                 return -ENXIO;
2653         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2654                 return -EINVAL;
2655         switch (cmd) {
2656         case SNDRV_PCM_IOCTL_READI_FRAMES:
2657         {
2658                 struct snd_xferi xferi;
2659                 struct snd_xferi __user *_xferi = arg;
2660                 struct snd_pcm_runtime *runtime = substream->runtime;
2661                 snd_pcm_sframes_t result;
2662                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2663                         return -EBADFD;
2664                 if (put_user(0, &_xferi->result))
2665                         return -EFAULT;
2666                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2667                         return -EFAULT;
2668                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2669                 __put_user(result, &_xferi->result);
2670                 return result < 0 ? result : 0;
2671         }
2672         case SNDRV_PCM_IOCTL_READN_FRAMES:
2673         {
2674                 struct snd_xfern xfern;
2675                 struct snd_xfern __user *_xfern = arg;
2676                 struct snd_pcm_runtime *runtime = substream->runtime;
2677                 void *bufs;
2678                 snd_pcm_sframes_t result;
2679                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2680                         return -EBADFD;
2681                 if (runtime->channels > 128)
2682                         return -EINVAL;
2683                 if (put_user(0, &_xfern->result))
2684                         return -EFAULT;
2685                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2686                         return -EFAULT;
2687                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2688                 if (bufs == NULL)
2689                         return -ENOMEM;
2690                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2691                         kfree(bufs);
2692                         return -EFAULT;
2693                 }
2694                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2695                 kfree(bufs);
2696                 __put_user(result, &_xfern->result);
2697                 return result < 0 ? result : 0;
2698         }
2699         case SNDRV_PCM_IOCTL_REWIND:
2700         {
2701                 snd_pcm_uframes_t frames;
2702                 snd_pcm_uframes_t __user *_frames = arg;
2703                 snd_pcm_sframes_t result;
2704                 if (get_user(frames, _frames))
2705                         return -EFAULT;
2706                 if (put_user(0, _frames))
2707                         return -EFAULT;
2708                 result = snd_pcm_capture_rewind(substream, frames);
2709                 __put_user(result, _frames);
2710                 return result < 0 ? result : 0;
2711         }
2712         case SNDRV_PCM_IOCTL_FORWARD:
2713         {
2714                 snd_pcm_uframes_t frames;
2715                 snd_pcm_uframes_t __user *_frames = arg;
2716                 snd_pcm_sframes_t result;
2717                 if (get_user(frames, _frames))
2718                         return -EFAULT;
2719                 if (put_user(0, _frames))
2720                         return -EFAULT;
2721                 result = snd_pcm_capture_forward(substream, frames);
2722                 __put_user(result, _frames);
2723                 return result < 0 ? result : 0;
2724         }
2725         }
2726         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2727 }
2728
2729 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2730                                    unsigned long arg)
2731 {
2732         struct snd_pcm_file *pcm_file;
2733
2734         pcm_file = file->private_data;
2735
2736         if (((cmd >> 8) & 0xff) != 'A')
2737                 return -ENOTTY;
2738
2739         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2740                                        (void __user *)arg);
2741 }
2742
2743 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2744                                   unsigned long arg)
2745 {
2746         struct snd_pcm_file *pcm_file;
2747
2748         pcm_file = file->private_data;
2749
2750         if (((cmd >> 8) & 0xff) != 'A')
2751                 return -ENOTTY;
2752
2753         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2754                                       (void __user *)arg);
2755 }
2756
2757 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2758                          unsigned int cmd, void *arg)
2759 {
2760         mm_segment_t fs;
2761         int result;
2762
2763         fs = snd_enter_user();
2764         switch (substream->stream) {
2765         case SNDRV_PCM_STREAM_PLAYBACK:
2766                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2767                                                  (void __user *)arg);
2768                 break;
2769         case SNDRV_PCM_STREAM_CAPTURE:
2770                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2771                                                 (void __user *)arg);
2772                 break;
2773         default:
2774                 result = -EINVAL;
2775                 break;
2776         }
2777         snd_leave_user(fs);
2778         return result;
2779 }
2780
2781 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2782
2783 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2784                             loff_t * offset)
2785 {
2786         struct snd_pcm_file *pcm_file;
2787         struct snd_pcm_substream *substream;
2788         struct snd_pcm_runtime *runtime;
2789         snd_pcm_sframes_t result;
2790
2791         pcm_file = file->private_data;
2792         substream = pcm_file->substream;
2793         if (PCM_RUNTIME_CHECK(substream))
2794                 return -ENXIO;
2795         runtime = substream->runtime;
2796         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2797                 return -EBADFD;
2798         if (!frame_aligned(runtime, count))
2799                 return -EINVAL;
2800         count = bytes_to_frames(runtime, count);
2801         result = snd_pcm_lib_read(substream, buf, count);
2802         if (result > 0)
2803                 result = frames_to_bytes(runtime, result);
2804         return result;
2805 }
2806
2807 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2808                              size_t count, loff_t * offset)
2809 {
2810         struct snd_pcm_file *pcm_file;
2811         struct snd_pcm_substream *substream;
2812         struct snd_pcm_runtime *runtime;
2813         snd_pcm_sframes_t result;
2814
2815         pcm_file = file->private_data;
2816         substream = pcm_file->substream;
2817         if (PCM_RUNTIME_CHECK(substream))
2818                 return -ENXIO;
2819         runtime = substream->runtime;
2820         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2821                 return -EBADFD;
2822         if (!frame_aligned(runtime, count))
2823                 return -EINVAL;
2824         count = bytes_to_frames(runtime, count);
2825         result = snd_pcm_lib_write(substream, buf, count);
2826         if (result > 0)
2827                 result = frames_to_bytes(runtime, result);
2828         return result;
2829 }
2830
2831 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2832                              unsigned long nr_segs, loff_t pos)
2833
2834 {
2835         struct snd_pcm_file *pcm_file;
2836         struct snd_pcm_substream *substream;
2837         struct snd_pcm_runtime *runtime;
2838         snd_pcm_sframes_t result;
2839         unsigned long i;
2840         void __user **bufs;
2841         snd_pcm_uframes_t frames;
2842
2843         pcm_file = iocb->ki_filp->private_data;
2844         substream = pcm_file->substream;
2845         if (PCM_RUNTIME_CHECK(substream))
2846                 return -ENXIO;
2847         runtime = substream->runtime;
2848         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2849                 return -EBADFD;
2850         if (nr_segs > 1024 || nr_segs != runtime->channels)
2851                 return -EINVAL;
2852         if (!frame_aligned(runtime, iov->iov_len))
2853                 return -EINVAL;
2854         frames = bytes_to_samples(runtime, iov->iov_len);
2855         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2856         if (bufs == NULL)
2857                 return -ENOMEM;
2858         for (i = 0; i < nr_segs; ++i)
2859                 bufs[i] = iov[i].iov_base;
2860         result = snd_pcm_lib_readv(substream, bufs, frames);
2861         if (result > 0)
2862                 result = frames_to_bytes(runtime, result);
2863         kfree(bufs);
2864         return result;
2865 }
2866
2867 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2868                               unsigned long nr_segs, loff_t pos)
2869 {
2870         struct snd_pcm_file *pcm_file;
2871         struct snd_pcm_substream *substream;
2872         struct snd_pcm_runtime *runtime;
2873         snd_pcm_sframes_t result;
2874         unsigned long i;
2875         void __user **bufs;
2876         snd_pcm_uframes_t frames;
2877
2878         pcm_file = iocb->ki_filp->private_data;
2879         substream = pcm_file->substream;
2880         if (PCM_RUNTIME_CHECK(substream))
2881                 return -ENXIO;
2882         runtime = substream->runtime;
2883         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2884                 return -EBADFD;
2885         if (nr_segs > 128 || nr_segs != runtime->channels ||
2886             !frame_aligned(runtime, iov->iov_len))
2887                 return -EINVAL;
2888         frames = bytes_to_samples(runtime, iov->iov_len);
2889         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2890         if (bufs == NULL)
2891                 return -ENOMEM;
2892         for (i = 0; i < nr_segs; ++i)
2893                 bufs[i] = iov[i].iov_base;
2894         result = snd_pcm_lib_writev(substream, bufs, frames);
2895         if (result > 0)
2896                 result = frames_to_bytes(runtime, result);
2897         kfree(bufs);
2898         return result;
2899 }
2900
2901 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2902 {
2903         struct snd_pcm_file *pcm_file;
2904         struct snd_pcm_substream *substream;
2905         struct snd_pcm_runtime *runtime;
2906         unsigned int mask;
2907         snd_pcm_uframes_t avail;
2908
2909         pcm_file = file->private_data;
2910
2911         substream = pcm_file->substream;
2912         if (PCM_RUNTIME_CHECK(substream))
2913                 return -ENXIO;
2914         runtime = substream->runtime;
2915
2916         poll_wait(file, &runtime->sleep, wait);
2917
2918         snd_pcm_stream_lock_irq(substream);
2919         avail = snd_pcm_playback_avail(runtime);
2920         switch (runtime->status->state) {
2921         case SNDRV_PCM_STATE_RUNNING:
2922         case SNDRV_PCM_STATE_PREPARED:
2923         case SNDRV_PCM_STATE_PAUSED:
2924                 if (avail >= runtime->control->avail_min) {
2925                         mask = POLLOUT | POLLWRNORM;
2926                         break;
2927                 }
2928                 /* Fall through */
2929         case SNDRV_PCM_STATE_DRAINING:
2930                 mask = 0;
2931                 break;
2932         default:
2933                 mask = POLLOUT | POLLWRNORM | POLLERR;
2934                 break;
2935         }
2936         snd_pcm_stream_unlock_irq(substream);
2937         return mask;
2938 }
2939
2940 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2941 {
2942         struct snd_pcm_file *pcm_file;
2943         struct snd_pcm_substream *substream;
2944         struct snd_pcm_runtime *runtime;
2945         unsigned int mask;
2946         snd_pcm_uframes_t avail;
2947
2948         pcm_file = file->private_data;
2949
2950         substream = pcm_file->substream;
2951         if (PCM_RUNTIME_CHECK(substream))
2952                 return -ENXIO;
2953         runtime = substream->runtime;
2954
2955         poll_wait(file, &runtime->sleep, wait);
2956
2957         snd_pcm_stream_lock_irq(substream);
2958         avail = snd_pcm_capture_avail(runtime);
2959         switch (runtime->status->state) {
2960         case SNDRV_PCM_STATE_RUNNING:
2961         case SNDRV_PCM_STATE_PREPARED:
2962         case SNDRV_PCM_STATE_PAUSED:
2963                 if (avail >= runtime->control->avail_min) {
2964                         mask = POLLIN | POLLRDNORM;
2965                         break;
2966                 }
2967                 mask = 0;
2968                 break;
2969         case SNDRV_PCM_STATE_DRAINING:
2970                 if (avail > 0) {
2971                         mask = POLLIN | POLLRDNORM;
2972                         break;
2973                 }
2974                 /* Fall through */
2975         default:
2976                 mask = POLLIN | POLLRDNORM | POLLERR;
2977                 break;
2978         }
2979         snd_pcm_stream_unlock_irq(substream);
2980         return mask;
2981 }
2982
2983 /*
2984  * mmap support
2985  */
2986
2987 /*
2988  * Only on coherent architectures, we can mmap the status and the control records
2989  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2990  */
2991 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2992 /*
2993  * mmap status record
2994  */
2995 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2996                                                 struct vm_fault *vmf)
2997 {
2998         struct snd_pcm_substream *substream = area->vm_private_data;
2999         struct snd_pcm_runtime *runtime;
3000
3001         if (substream == NULL)
3002                 return VM_FAULT_SIGBUS;
3003         runtime = substream->runtime;
3004         vmf->page = virt_to_page(runtime->status);
3005         get_page(vmf->page);
3006         return 0;
3007 }
3008
3009 static struct vm_operations_struct snd_pcm_vm_ops_status =
3010 {
3011         .fault =        snd_pcm_mmap_status_fault,
3012 };
3013
3014 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3015                                struct vm_area_struct *area)
3016 {
3017         struct snd_pcm_runtime *runtime;
3018         long size;
3019         if (!(area->vm_flags & VM_READ))
3020                 return -EINVAL;
3021         runtime = substream->runtime;
3022         size = area->vm_end - area->vm_start;
3023         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3024                 return -EINVAL;
3025         area->vm_ops = &snd_pcm_vm_ops_status;
3026         area->vm_private_data = substream;
3027         area->vm_flags |= VM_RESERVED;
3028         return 0;
3029 }
3030
3031 /*
3032  * mmap control record
3033  */
3034 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3035                                                 struct vm_fault *vmf)
3036 {
3037         struct snd_pcm_substream *substream = area->vm_private_data;
3038         struct snd_pcm_runtime *runtime;
3039
3040         if (substream == NULL)
3041                 return VM_FAULT_SIGBUS;
3042         runtime = substream->runtime;
3043         vmf->page = virt_to_page(runtime->control);
3044         get_page(vmf->page);
3045         return 0;
3046 }
3047
3048 static struct vm_operations_struct snd_pcm_vm_ops_control =
3049 {
3050         .fault =        snd_pcm_mmap_control_fault,
3051 };
3052
3053 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3054                                 struct vm_area_struct *area)
3055 {
3056         struct snd_pcm_runtime *runtime;
3057         long size;
3058         if (!(area->vm_flags & VM_READ))
3059                 return -EINVAL;
3060         runtime = substream->runtime;
3061         size = area->vm_end - area->vm_start;
3062         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3063                 return -EINVAL;
3064         area->vm_ops = &snd_pcm_vm_ops_control;
3065         area->vm_private_data = substream;
3066         area->vm_flags |= VM_RESERVED;
3067         return 0;
3068 }
3069 #else /* ! coherent mmap */
3070 /*
3071  * don't support mmap for status and control records.
3072  */
3073 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3074                                struct vm_area_struct *area)
3075 {
3076         return -ENXIO;
3077 }
3078 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3079                                 struct vm_area_struct *area)
3080 {
3081         return -ENXIO;
3082 }
3083 #endif /* coherent mmap */
3084
3085 /*
3086  * fault callback for mmapping a RAM page
3087  */
3088 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3089                                                 struct vm_fault *vmf)
3090 {
3091         struct snd_pcm_substream *substream = area->vm_private_data;
3092         struct snd_pcm_runtime *runtime;
3093         unsigned long offset;
3094         struct page * page;
3095         void *vaddr;
3096         size_t dma_bytes;
3097
3098         if (substream == NULL)
3099                 return VM_FAULT_SIGBUS;
3100         runtime = substream->runtime;
3101         offset = vmf->pgoff << PAGE_SHIFT;
3102         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3103         if (offset > dma_bytes - PAGE_SIZE)
3104                 return VM_FAULT_SIGBUS;
3105         if (substream->ops->page) {
3106                 page = substream->ops->page(substream, offset);
3107                 if (!page)
3108                         return VM_FAULT_SIGBUS;
3109         } else {
3110                 vaddr = runtime->dma_area + offset;
3111                 page = virt_to_page(vaddr);
3112         }
3113         get_page(page);
3114         vmf->page = page;
3115         return 0;
3116 }
3117
3118 static struct vm_operations_struct snd_pcm_vm_ops_data =
3119 {
3120         .open =         snd_pcm_mmap_data_open,
3121         .close =        snd_pcm_mmap_data_close,
3122         .fault =        snd_pcm_mmap_data_fault,
3123 };
3124
3125 /*
3126  * mmap the DMA buffer on RAM
3127  */
3128 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3129                                 struct vm_area_struct *area)
3130 {
3131         area->vm_ops = &snd_pcm_vm_ops_data;
3132         area->vm_private_data = substream;
3133         area->vm_flags |= VM_RESERVED;
3134         atomic_inc(&substream->mmap_count);
3135         return 0;
3136 }
3137
3138 /*
3139  * mmap the DMA buffer on I/O memory area
3140  */
3141 #if SNDRV_PCM_INFO_MMAP_IOMEM
3142 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3143 {
3144         .open =         snd_pcm_mmap_data_open,
3145         .close =        snd_pcm_mmap_data_close,
3146 };
3147
3148 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3149                            struct vm_area_struct *area)
3150 {
3151         long size;
3152         unsigned long offset;
3153
3154 #ifdef pgprot_noncached
3155         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3156 #endif
3157         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3158         area->vm_private_data = substream;
3159         area->vm_flags |= VM_IO;
3160         size = area->vm_end - area->vm_start;
3161         offset = area->vm_pgoff << PAGE_SHIFT;
3162         if (io_remap_pfn_range(area, area->vm_start,
3163                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3164                                 size, area->vm_page_prot))
3165                 return -EAGAIN;
3166         atomic_inc(&substream->mmap_count);
3167         return 0;
3168 }
3169
3170 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3171 #endif /* SNDRV_PCM_INFO_MMAP */
3172
3173 /*
3174  * mmap DMA buffer
3175  */
3176 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3177                       struct vm_area_struct *area)
3178 {
3179         struct snd_pcm_runtime *runtime;
3180         long size;
3181         unsigned long offset;
3182         size_t dma_bytes;
3183
3184         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3185                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3186                         return -EINVAL;
3187         } else {
3188                 if (!(area->vm_flags & VM_READ))
3189                         return -EINVAL;
3190         }
3191         runtime = substream->runtime;
3192         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3193                 return -EBADFD;
3194         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3195                 return -ENXIO;
3196         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3197             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3198                 return -EINVAL;
3199         size = area->vm_end - area->vm_start;
3200         offset = area->vm_pgoff << PAGE_SHIFT;
3201         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3202         if ((size_t)size > dma_bytes)
3203                 return -EINVAL;
3204         if (offset > dma_bytes - size)
3205                 return -EINVAL;
3206
3207         if (substream->ops->mmap)
3208                 return substream->ops->mmap(substream, area);
3209         else
3210                 return snd_pcm_default_mmap(substream, area);
3211 }
3212
3213 EXPORT_SYMBOL(snd_pcm_mmap_data);
3214
3215 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3216 {
3217         struct snd_pcm_file * pcm_file;
3218         struct snd_pcm_substream *substream;
3219         unsigned long offset;
3220
3221         pcm_file = file->private_data;
3222         substream = pcm_file->substream;
3223         if (PCM_RUNTIME_CHECK(substream))
3224                 return -ENXIO;
3225
3226         offset = area->vm_pgoff << PAGE_SHIFT;
3227         switch (offset) {
3228         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3229                 if (pcm_file->no_compat_mmap)
3230                         return -ENXIO;
3231                 return snd_pcm_mmap_status(substream, file, area);
3232         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3233                 if (pcm_file->no_compat_mmap)
3234                         return -ENXIO;
3235                 return snd_pcm_mmap_control(substream, file, area);
3236         default:
3237                 return snd_pcm_mmap_data(substream, file, area);
3238         }
3239         return 0;
3240 }
3241
3242 static int snd_pcm_fasync(int fd, struct file * file, int on)
3243 {
3244         struct snd_pcm_file * pcm_file;
3245         struct snd_pcm_substream *substream;
3246         struct snd_pcm_runtime *runtime;
3247         int err = -ENXIO;
3248
3249         lock_kernel();
3250         pcm_file = file->private_data;
3251         substream = pcm_file->substream;
3252         if (PCM_RUNTIME_CHECK(substream))
3253                 goto out;
3254         runtime = substream->runtime;
3255         err = fasync_helper(fd, file, on, &runtime->fasync);
3256 out:
3257         unlock_kernel();
3258         if (err < 0)
3259                 return err;
3260         return 0;
3261 }
3262
3263 /*
3264  * ioctl32 compat
3265  */
3266 #ifdef CONFIG_COMPAT
3267 #include "pcm_compat.c"
3268 #else
3269 #define snd_pcm_ioctl_compat    NULL
3270 #endif
3271
3272 /*
3273  *  To be removed helpers to keep binary compatibility
3274  */
3275
3276 #ifdef CONFIG_SND_SUPPORT_OLD_API
3277 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3278 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3279
3280 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3281                                                struct snd_pcm_hw_params_old *oparams)
3282 {
3283         unsigned int i;
3284
3285         memset(params, 0, sizeof(*params));
3286         params->flags = oparams->flags;
3287         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3288                 params->masks[i].bits[0] = oparams->masks[i];
3289         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3290         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3291         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3292         params->info = oparams->info;
3293         params->msbits = oparams->msbits;
3294         params->rate_num = oparams->rate_num;
3295         params->rate_den = oparams->rate_den;
3296         params->fifo_size = oparams->fifo_size;
3297 }
3298
3299 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3300                                              struct snd_pcm_hw_params *params)
3301 {
3302         unsigned int i;
3303
3304         memset(oparams, 0, sizeof(*oparams));
3305         oparams->flags = params->flags;
3306         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3307                 oparams->masks[i] = params->masks[i].bits[0];
3308         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3309         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3310         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3311         oparams->info = params->info;
3312         oparams->msbits = params->msbits;
3313         oparams->rate_num = params->rate_num;
3314         oparams->rate_den = params->rate_den;
3315         oparams->fifo_size = params->fifo_size;
3316 }
3317
3318 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3319                                       struct snd_pcm_hw_params_old __user * _oparams)
3320 {
3321         struct snd_pcm_hw_params *params;
3322         struct snd_pcm_hw_params_old *oparams = NULL;
3323         int err;
3324
3325         params = kmalloc(sizeof(*params), GFP_KERNEL);
3326         if (!params) {
3327                 err = -ENOMEM;
3328                 goto out;
3329         }
3330         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3331         if (!oparams) {
3332                 err = -ENOMEM;
3333                 goto out;
3334         }
3335
3336         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3337                 err = -EFAULT;
3338                 goto out;
3339         }
3340         snd_pcm_hw_convert_from_old_params(params, oparams);
3341         err = snd_pcm_hw_refine(substream, params);
3342         snd_pcm_hw_convert_to_old_params(oparams, params);
3343         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3344                 if (!err)
3345                         err = -EFAULT;
3346         }
3347 out:
3348         kfree(params);
3349         kfree(oparams);
3350         return err;
3351 }
3352
3353 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3354                                       struct snd_pcm_hw_params_old __user * _oparams)
3355 {
3356         struct snd_pcm_hw_params *params;
3357         struct snd_pcm_hw_params_old *oparams = NULL;
3358         int err;
3359
3360         params = kmalloc(sizeof(*params), GFP_KERNEL);
3361         if (!params) {
3362                 err = -ENOMEM;
3363                 goto out;
3364         }
3365         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3366         if (!oparams) {
3367                 err = -ENOMEM;
3368                 goto out;
3369         }
3370         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3371                 err = -EFAULT;
3372                 goto out;
3373         }
3374         snd_pcm_hw_convert_from_old_params(params, oparams);
3375         err = snd_pcm_hw_params(substream, params);
3376         snd_pcm_hw_convert_to_old_params(oparams, params);
3377         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3378                 if (!err)
3379                         err = -EFAULT;
3380         }
3381 out:
3382         kfree(params);
3383         kfree(oparams);
3384         return err;
3385 }
3386 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3387
3388 #ifndef CONFIG_MMU
3389 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3390                                       unsigned long len, unsigned long pgoff,
3391                                       unsigned long flags)
3392 {
3393         return 0;
3394 }
3395 #else
3396 # define dummy_get_unmapped_area NULL
3397 #endif
3398
3399 /*
3400  *  Register section
3401  */
3402
3403 const struct file_operations snd_pcm_f_ops[2] = {
3404         {
3405                 .owner =                THIS_MODULE,
3406                 .write =                snd_pcm_write,
3407                 .aio_write =            snd_pcm_aio_write,
3408                 .open =                 snd_pcm_playback_open,
3409                 .release =              snd_pcm_release,
3410                 .poll =                 snd_pcm_playback_poll,
3411                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3412                 .compat_ioctl =         snd_pcm_ioctl_compat,
3413                 .mmap =                 snd_pcm_mmap,
3414                 .fasync =               snd_pcm_fasync,
3415                 .get_unmapped_area =    dummy_get_unmapped_area,
3416         },
3417         {
3418                 .owner =                THIS_MODULE,
3419                 .read =                 snd_pcm_read,
3420                 .aio_read =             snd_pcm_aio_read,
3421                 .open =                 snd_pcm_capture_open,
3422                 .release =              snd_pcm_release,
3423                 .poll =                 snd_pcm_capture_poll,
3424                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3425                 .compat_ioctl =         snd_pcm_ioctl_compat,
3426                 .mmap =                 snd_pcm_mmap,
3427                 .fasync =               snd_pcm_fasync,
3428                 .get_unmapped_area =    dummy_get_unmapped_area,
3429         }
3430 };