sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos_params.h>
  28 #include <linux/uio.h>
  29 #include <sound/core.h>
  30 #include <sound/control.h>
  31 #include <sound/info.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/timer.h>
  35 #include <sound/minors.h>
  36 #include <asm/io.h>
  37
  38 /*
  39  *  Compatibility
  40  */
  41
  42 struct snd_pcm_hw_params_old {
  43         unsigned int flags;
  44         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  45                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  46         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  47                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  48         unsigned int rmask;
  49         unsigned int cmask;
  50         unsigned int info;
  51         unsigned int msbits;
  52         unsigned int rate_num;
  53         unsigned int rate_den;
  54         snd_pcm_uframes_t fifo_size;
  55         unsigned char reserved[64];
  56 };
  57
  58 #ifdef CONFIG_SND_SUPPORT_OLD_API
  59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  61
  62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  63                                       struct snd_pcm_hw_params_old __user * _oparams);
  64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 #endif
  67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  68
  69 /*
  70  *
  71  */
  72
  73 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  74 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  75
  76 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  77
  78 static inline mm_segment_t snd_enter_user(void)
  79 {
  80         mm_segment_t fs = get_fs();
  81         set_fs(get_ds());
  82         return fs;
  83 }
  84
  85 static inline void snd_leave_user(mm_segment_t fs)
  86 {
  87         set_fs(fs);
  88 }
  89
  90
  91
  92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  93 {
  94         struct snd_pcm_runtime *runtime;
  95         struct snd_pcm *pcm = substream->pcm;
  96         struct snd_pcm_str *pstr = substream->pstr;
  97
  98         memset(info, 0, sizeof(*info));
  99         info->card = pcm->card->number;
 100         info->device = pcm->device;
 101         info->stream = substream->stream;
 102         info->subdevice = substream->number;
 103         strlcpy(info->id, pcm->id, sizeof(info->id));
 104         strlcpy(info->name, pcm->name, sizeof(info->name));
 105         info->dev_class = pcm->dev_class;
 106         info->dev_subclass = pcm->dev_subclass;
 107         info->subdevices_count = pstr->substream_count;
 108         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 109         strlcpy(info->subname, substream->name, sizeof(info->subname));
 110         runtime = substream->runtime;
 111         /* AB: FIXME!!! This is definitely nonsense */
 112         if (runtime) {
 113                 info->sync = runtime->sync;
 114                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 115         }
 116         return 0;
 117 }
 118
 119 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 120                       struct snd_pcm_info __user * _info)
 121 {
 122         struct snd_pcm_info *info;
 123         int err;
 124
 125         info = kmalloc(sizeof(*info), GFP_KERNEL);
 126         if (! info)
 127                 return -ENOMEM;
 128         err = snd_pcm_info(substream, info);
 129         if (err >= 0) {
 130                 if (copy_to_user(_info, info, sizeof(*info)))
 131                         err = -EFAULT;
 132         }
 133         kfree(info);
 134         return err;
 135 }
 136
 137 #undef RULES_DEBUG
 138
 139 #ifdef RULES_DEBUG
 140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 141 char *snd_pcm_hw_param_names[] = {
 142         HW_PARAM(ACCESS),
 143         HW_PARAM(FORMAT),
 144         HW_PARAM(SUBFORMAT),
 145         HW_PARAM(SAMPLE_BITS),
 146         HW_PARAM(FRAME_BITS),
 147         HW_PARAM(CHANNELS),
 148         HW_PARAM(RATE),
 149         HW_PARAM(PERIOD_TIME),
 150         HW_PARAM(PERIOD_SIZE),
 151         HW_PARAM(PERIOD_BYTES),
 152         HW_PARAM(PERIODS),
 153         HW_PARAM(BUFFER_TIME),
 154         HW_PARAM(BUFFER_SIZE),
 155         HW_PARAM(BUFFER_BYTES),
 156         HW_PARAM(TICK_TIME),
 157 };
 158 #endif
 159
 160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 161                       struct snd_pcm_hw_params *params)
 162 {
 163         unsigned int k;
 164         struct snd_pcm_hardware *hw;
 165         struct snd_interval *i = NULL;
 166         struct snd_mask *m = NULL;
 167         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 168         unsigned int rstamps[constrs->rules_num];
 169         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 170         unsigned int stamp = 2;
 171         int changed, again;
 172
 173         params->info = 0;
 174         params->fifo_size = 0;
 175         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 176                 params->msbits = 0;
 177         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 178                 params->rate_num = 0;
 179                 params->rate_den = 0;
 180         }
 181
 182         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 183                 m = hw_param_mask(params, k);
 184                 if (snd_mask_empty(m))
 185                         return -EINVAL;
 186                 if (!(params->rmask & (1 << k)))
 187                         continue;
 188 #ifdef RULES_DEBUG
 189                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 190                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 191 #endif
 192                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 193 #ifdef RULES_DEBUG
 194                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 if (changed)
 197                         params->cmask |= 1 << k;
 198                 if (changed < 0)
 199                         return changed;
 200         }
 201
 202         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 203                 i = hw_param_interval(params, k);
 204                 if (snd_interval_empty(i))
 205                         return -EINVAL;
 206                 if (!(params->rmask & (1 << k)))
 207                         continue;
 208 #ifdef RULES_DEBUG
 209                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 210                 if (i->empty)
 211                         printk("empty");
 212                 else
 213                         printk("%c%u %u%c",
 214                                i->openmin ? '(' : '[', i->min,
 215                                i->max, i->openmax ? ')' : ']');
 216                 printk(" -> ");
 217 #endif
 218                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 219 #ifdef RULES_DEBUG
 220                 if (i->empty)
 221                         printk("empty\n");
 222                 else
 223                         printk("%c%u %u%c\n",
 224                                i->openmin ? '(' : '[', i->min,
 225                                i->max, i->openmax ? ')' : ']');
 226 #endif
 227                 if (changed)
 228                         params->cmask |= 1 << k;
 229                 if (changed < 0)
 230                         return changed;
 231         }
 232
 233         for (k = 0; k < constrs->rules_num; k++)
 234                 rstamps[k] = 0;
 235         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 236                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 237         do {
 238                 again = 0;
 239                 for (k = 0; k < constrs->rules_num; k++) {
 240                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 241                         unsigned int d;
 242                         int doit = 0;
 243                         if (r->cond && !(r->cond & params->flags))
 244                                 continue;
 245                         for (d = 0; r->deps[d] >= 0; d++) {
 246                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 247                                         doit = 1;
 248                                         break;
 249                                 }
 250                         }
 251                         if (!doit)
 252                                 continue;
 253 #ifdef RULES_DEBUG
 254                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 255                         if (r->var >= 0) {
 256                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 257                                 if (hw_is_mask(r->var)) {
 258                                         m = hw_param_mask(params, r->var);
 259                                         printk("%x", *m->bits);
 260                                 } else {
 261                                         i = hw_param_interval(params, r->var);
 262                                         if (i->empty)
 263                                                 printk("empty");
 264                                         else
 265                                                 printk("%c%u %u%c",
 266                                                        i->openmin ? '(' : '[', i->min,
 267                                                        i->max, i->openmax ? ')' : ']');
 268                                 }
 269                         }
 270 #endif
 271                         changed = r->func(params, r);
 272 #ifdef RULES_DEBUG
 273                         if (r->var >= 0) {
 274                                 printk(" -> ");
 275                                 if (hw_is_mask(r->var))
 276                                         printk("%x", *m->bits);
 277                                 else {
 278                                         if (i->empty)
 279                                                 printk("empty");
 280                                         else
 281                                                 printk("%c%u %u%c",
 282                                                        i->openmin ? '(' : '[', i->min,
 283                                                        i->max, i->openmax ? ')' : ']');
 284                                 }
 285                         }
 286                         printk("\n");
 287 #endif
 288                         rstamps[k] = stamp;
 289                         if (changed && r->var >= 0) {
 290                                 params->cmask |= (1 << r->var);
 291                                 vstamps[r->var] = stamp;
 292                                 again = 1;
 293                         }
 294                         if (changed < 0)
 295                                 return changed;
 296                         stamp++;
 297                 }
 298         } while (again);
 299         if (!params->msbits) {
 300                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 301                 if (snd_interval_single(i))
 302                         params->msbits = snd_interval_value(i);
 303         }
 304
 305         if (!params->rate_den) {
 306                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 307                 if (snd_interval_single(i)) {
 308                         params->rate_num = snd_interval_value(i);
 309                         params->rate_den = 1;
 310                 }
 311         }
 312
 313         hw = &substream->runtime->hw;
 314         if (!params->info)
 315                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 316         if (!params->fifo_size) {
 317                 if (snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) ==
 318                     snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) &&
 319                     snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) ==
 320                     snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) {
 321                         changed = substream->ops->ioctl(substream,
 322                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 323                         if (changed < 0)
 324                                 return changed;
 325                 }
 326         }
 327         params->rmask = 0;
 328         return 0;
 329 }
 330
 331 EXPORT_SYMBOL(snd_pcm_hw_refine);
 332
 333 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 334                                   struct snd_pcm_hw_params __user * _params)
 335 {
 336         struct snd_pcm_hw_params *params;
 337         int err;
 338
 339         params = memdup_user(_params, sizeof(*params));
 340         if (IS_ERR(params))
 341                 return PTR_ERR(params);
 342
 343         err = snd_pcm_hw_refine(substream, params);
 344         if (copy_to_user(_params, params, sizeof(*params))) {
 345                 if (!err)
 346                         err = -EFAULT;
 347         }
 348
 349         kfree(params);
 350         return err;
 351 }
 352
 353 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 354 {
 355         int usecs;
 356
 357         if (! runtime->rate)
 358                 return -1; /* invalid */
 359
 360         /* take 75% of period time as the deadline */
 361         usecs = (750000 / runtime->rate) * runtime->period_size;
 362         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 363                 runtime->rate;
 364
 365         return usecs;
 366 }
 367
 368 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 369                              struct snd_pcm_hw_params *params)
 370 {
 371         struct snd_pcm_runtime *runtime;
 372         int err, usecs;
 373         unsigned int bits;
 374         snd_pcm_uframes_t frames;
 375
 376         if (PCM_RUNTIME_CHECK(substream))
 377                 return -ENXIO;
 378         runtime = substream->runtime;
 379         snd_pcm_stream_lock_irq(substream);
 380         switch (runtime->status->state) {
 381         case SNDRV_PCM_STATE_OPEN:
 382         case SNDRV_PCM_STATE_SETUP:
 383         case SNDRV_PCM_STATE_PREPARED:
 384                 break;
 385         default:
 386                 snd_pcm_stream_unlock_irq(substream);
 387                 return -EBADFD;
 388         }
 389         snd_pcm_stream_unlock_irq(substream);
 390 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 391         if (!substream->oss.oss)
 392 #endif
 393                 if (atomic_read(&substream->mmap_count))
 394                         return -EBADFD;
 395
 396         params->rmask = ~0U;
 397         err = snd_pcm_hw_refine(substream, params);
 398         if (err < 0)
 399                 goto _error;
 400
 401         err = snd_pcm_hw_params_choose(substream, params);
 402         if (err < 0)
 403                 goto _error;
 404
 405         if (substream->ops->hw_params != NULL) {
 406                 err = substream->ops->hw_params(substream, params);
 407                 if (err < 0)
 408                         goto _error;
 409         }
 410
 411         runtime->access = params_access(params);
 412         runtime->format = params_format(params);
 413         runtime->subformat = params_subformat(params);
 414         runtime->channels = params_channels(params);
 415         runtime->rate = params_rate(params);
 416         runtime->period_size = params_period_size(params);
 417         runtime->periods = params_periods(params);
 418         runtime->buffer_size = params_buffer_size(params);
 419         runtime->info = params->info;
 420         runtime->rate_num = params->rate_num;
 421         runtime->rate_den = params->rate_den;
 422
 423         bits = snd_pcm_format_physical_width(runtime->format);
 424         runtime->sample_bits = bits;
 425         bits *= runtime->channels;
 426         runtime->frame_bits = bits;
 427         frames = 1;
 428         while (bits % 8 != 0) {
 429                 bits *= 2;
 430                 frames *= 2;
 431         }
 432         runtime->byte_align = bits / 8;
 433         runtime->min_align = frames;
 434
 435         /* Default sw params */
 436         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 437         runtime->period_step = 1;
 438         runtime->control->avail_min = runtime->period_size;
 439         runtime->start_threshold = 1;
 440         runtime->stop_threshold = runtime->buffer_size;
 441         runtime->silence_threshold = 0;
 442         runtime->silence_size = 0;
 443         runtime->boundary = runtime->buffer_size;
 444         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 445                 runtime->boundary *= 2;
 446
 447         snd_pcm_timer_resolution_change(substream);
 448         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 449
 450         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 451                                 substream->latency_id);
 452         if ((usecs = period_to_usecs(runtime)) >= 0)
 453                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
 454                                         substream->latency_id, usecs);
 455         return 0;
 456  _error:
 457         /* hardware might be unuseable from this time,
 458            so we force application to retry to set
 459            the correct hardware parameter settings */
 460         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 461         if (substream->ops->hw_free != NULL)
 462                 substream->ops->hw_free(substream);
 463         return err;
 464 }
 465
 466 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 467                                   struct snd_pcm_hw_params __user * _params)
 468 {
 469         struct snd_pcm_hw_params *params;
 470         int err;
 471
 472         params = memdup_user(_params, sizeof(*params));
 473         if (IS_ERR(params))
 474                 return PTR_ERR(params);
 475
 476         err = snd_pcm_hw_params(substream, params);
 477         if (copy_to_user(_params, params, sizeof(*params))) {
 478                 if (!err)
 479                         err = -EFAULT;
 480         }
 481
 482         kfree(params);
 483         return err;
 484 }
 485
 486 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 487 {
 488         struct snd_pcm_runtime *runtime;
 489         int result = 0;
 490
 491         if (PCM_RUNTIME_CHECK(substream))
 492                 return -ENXIO;
 493         runtime = substream->runtime;
 494         snd_pcm_stream_lock_irq(substream);
 495         switch (runtime->status->state) {
 496         case SNDRV_PCM_STATE_SETUP:
 497         case SNDRV_PCM_STATE_PREPARED:
 498                 break;
 499         default:
 500                 snd_pcm_stream_unlock_irq(substream);
 501                 return -EBADFD;
 502         }
 503         snd_pcm_stream_unlock_irq(substream);
 504         if (atomic_read(&substream->mmap_count))
 505                 return -EBADFD;
 506         if (substream->ops->hw_free)
 507                 result = substream->ops->hw_free(substream);
 508         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 509         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 510                 substream->latency_id);
 511         return result;
 512 }
 513
 514 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 515                              struct snd_pcm_sw_params *params)
 516 {
 517         struct snd_pcm_runtime *runtime;
 518
 519         if (PCM_RUNTIME_CHECK(substream))
 520                 return -ENXIO;
 521         runtime = substream->runtime;
 522         snd_pcm_stream_lock_irq(substream);
 523         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 524                 snd_pcm_stream_unlock_irq(substream);
 525                 return -EBADFD;
 526         }
 527         snd_pcm_stream_unlock_irq(substream);
 528
 529         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 530                 return -EINVAL;
 531         if (params->avail_min == 0)
 532                 return -EINVAL;
 533         if (params->silence_size >= runtime->boundary) {
 534                 if (params->silence_threshold != 0)
 535                         return -EINVAL;
 536         } else {
 537                 if (params->silence_size > params->silence_threshold)
 538                         return -EINVAL;
 539                 if (params->silence_threshold > runtime->buffer_size)
 540                         return -EINVAL;
 541         }
 542         snd_pcm_stream_lock_irq(substream);
 543         runtime->tstamp_mode = params->tstamp_mode;
 544         runtime->period_step = params->period_step;
 545         runtime->control->avail_min = params->avail_min;
 546         runtime->start_threshold = params->start_threshold;
 547         runtime->stop_threshold = params->stop_threshold;
 548         runtime->silence_threshold = params->silence_threshold;
 549         runtime->silence_size = params->silence_size;
 550         params->boundary = runtime->boundary;
 551         if (snd_pcm_running(substream)) {
 552                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 553                     runtime->silence_size > 0)
 554                         snd_pcm_playback_silence(substream, ULONG_MAX);
 555                 wake_up(&runtime->sleep);
 556         }
 557         snd_pcm_stream_unlock_irq(substream);
 558         return 0;
 559 }
 560
 561 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 562                                   struct snd_pcm_sw_params __user * _params)
 563 {
 564         struct snd_pcm_sw_params params;
 565         int err;
 566         if (copy_from_user(&params, _params, sizeof(params)))
 567                 return -EFAULT;
 568         err = snd_pcm_sw_params(substream, &params);
 569         if (copy_to_user(_params, &params, sizeof(params)))
 570                 return -EFAULT;
 571         return err;
 572 }
 573
 574 int snd_pcm_status(struct snd_pcm_substream *substream,
 575                    struct snd_pcm_status *status)
 576 {
 577         struct snd_pcm_runtime *runtime = substream->runtime;
 578
 579         snd_pcm_stream_lock_irq(substream);
 580         status->state = runtime->status->state;
 581         status->suspended_state = runtime->status->suspended_state;
 582         if (status->state == SNDRV_PCM_STATE_OPEN)
 583                 goto _end;
 584         status->trigger_tstamp = runtime->trigger_tstamp;
 585         if (snd_pcm_running(substream)) {
 586                 snd_pcm_update_hw_ptr(substream);
 587                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 588                         status->tstamp = runtime->status->tstamp;
 589                         goto _tstamp_end;
 590                 }
 591         }
 592         snd_pcm_gettime(runtime, &status->tstamp);
 593  _tstamp_end:
 594         status->appl_ptr = runtime->control->appl_ptr;
 595         status->hw_ptr = runtime->status->hw_ptr;
 596         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 597                 status->avail = snd_pcm_playback_avail(runtime);
 598                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 599                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 600                         status->delay = runtime->buffer_size - status->avail;
 601                         status->delay += runtime->delay;
 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 + runtime->delay;
 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->hw_ptr_jiffies = jiffies;
 862         runtime->status->state = state;
 863         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 864             runtime->silence_size > 0)
 865                 snd_pcm_playback_silence(substream, ULONG_MAX);
 866         if (substream->timer)
 867                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 868                                  &runtime->trigger_tstamp);
 869 }
 870
 871 static struct action_ops snd_pcm_action_start = {
 872         .pre_action = snd_pcm_pre_start,
 873         .do_action = snd_pcm_do_start,
 874         .undo_action = snd_pcm_undo_start,
 875         .post_action = snd_pcm_post_start
 876 };
 877
 878 /**
 879  * snd_pcm_start - start all linked streams
 880  * @substream: the PCM substream instance
 881  */
 882 int snd_pcm_start(struct snd_pcm_substream *substream)
 883 {
 884         return snd_pcm_action(&snd_pcm_action_start, substream,
 885                               SNDRV_PCM_STATE_RUNNING);
 886 }
 887
 888 /*
 889  * stop callbacks
 890  */
 891 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 892 {
 893         struct snd_pcm_runtime *runtime = substream->runtime;
 894         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 895                 return -EBADFD;
 896         runtime->trigger_master = substream;
 897         return 0;
 898 }
 899
 900 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 901 {
 902         if (substream->runtime->trigger_master == substream &&
 903             snd_pcm_running(substream))
 904                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 905         return 0; /* unconditonally stop all substreams */
 906 }
 907
 908 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 909 {
 910         struct snd_pcm_runtime *runtime = substream->runtime;
 911         if (runtime->status->state != state) {
 912                 snd_pcm_trigger_tstamp(substream);
 913                 if (substream->timer)
 914                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 915                                          &runtime->trigger_tstamp);
 916                 runtime->status->state = state;
 917         }
 918         wake_up(&runtime->sleep);
 919 }
 920
 921 static struct action_ops snd_pcm_action_stop = {
 922         .pre_action = snd_pcm_pre_stop,
 923         .do_action = snd_pcm_do_stop,
 924         .post_action = snd_pcm_post_stop
 925 };
 926
 927 /**
 928  * snd_pcm_stop - try to stop all running streams in the substream group
 929  * @substream: the PCM substream instance
 930  * @state: PCM state after stopping the stream
 931  *
 932  * The state of each stream is then changed to the given state unconditionally.
 933  */
 934 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 935 {
 936         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 937 }
 938
 939 EXPORT_SYMBOL(snd_pcm_stop);
 940
 941 /**
 942  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 943  * @substream: the PCM substream
 944  *
 945  * After stopping, the state is changed to SETUP.
 946  * Unlike snd_pcm_stop(), this affects only the given stream.
 947  */
 948 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 949 {
 950         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 951                                      SNDRV_PCM_STATE_SETUP);
 952 }
 953
 954 /*
 955  * pause callbacks
 956  */
 957 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 958 {
 959         struct snd_pcm_runtime *runtime = substream->runtime;
 960         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 961                 return -ENOSYS;
 962         if (push) {
 963                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 964                         return -EBADFD;
 965         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 966                 return -EBADFD;
 967         runtime->trigger_master = substream;
 968         return 0;
 969 }
 970
 971 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 972 {
 973         if (substream->runtime->trigger_master != substream)
 974                 return 0;
 975         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
 976          * a delta betwen the current jiffies, this gives a large enough
 977          * delta, effectively to skip the check once.
 978          */
 979         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
 980         return substream->ops->trigger(substream,
 981                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 982                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 983 }
 984
 985 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 986 {
 987         if (substream->runtime->trigger_master == substream)
 988                 substream->ops->trigger(substream,
 989                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
 990                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 991 }
 992
 993 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
 994 {
 995         struct snd_pcm_runtime *runtime = substream->runtime;
 996         snd_pcm_trigger_tstamp(substream);
 997         if (push) {
 998                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
 999                 if (substream->timer)
1000                         snd_timer_notify(substream->timer,
1001                                          SNDRV_TIMER_EVENT_MPAUSE,
1002                                          &runtime->trigger_tstamp);
1003                 wake_up(&runtime->sleep);
1004         } else {
1005                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1006                 if (substream->timer)
1007                         snd_timer_notify(substream->timer,
1008                                          SNDRV_TIMER_EVENT_MCONTINUE,
1009                                          &runtime->trigger_tstamp);
1010         }
1011 }
1012
1013 static struct action_ops snd_pcm_action_pause = {
1014         .pre_action = snd_pcm_pre_pause,
1015         .do_action = snd_pcm_do_pause,
1016         .undo_action = snd_pcm_undo_pause,
1017         .post_action = snd_pcm_post_pause
1018 };
1019
1020 /*
1021  * Push/release the pause for all linked streams.
1022  */
1023 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1024 {
1025         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1026 }
1027
1028 #ifdef CONFIG_PM
1029 /* suspend */
1030
1031 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1032 {
1033         struct snd_pcm_runtime *runtime = substream->runtime;
1034         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1035                 return -EBUSY;
1036         runtime->trigger_master = substream;
1037         return 0;
1038 }
1039
1040 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1041 {
1042         struct snd_pcm_runtime *runtime = substream->runtime;
1043         if (runtime->trigger_master != substream)
1044                 return 0;
1045         if (! snd_pcm_running(substream))
1046                 return 0;
1047         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1048         return 0; /* suspend unconditionally */
1049 }
1050
1051 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1052 {
1053         struct snd_pcm_runtime *runtime = substream->runtime;
1054         snd_pcm_trigger_tstamp(substream);
1055         if (substream->timer)
1056                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1057                                  &runtime->trigger_tstamp);
1058         runtime->status->suspended_state = runtime->status->state;
1059         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1060         wake_up(&runtime->sleep);
1061 }
1062
1063 static struct action_ops snd_pcm_action_suspend = {
1064         .pre_action = snd_pcm_pre_suspend,
1065         .do_action = snd_pcm_do_suspend,
1066         .post_action = snd_pcm_post_suspend
1067 };
1068
1069 /**
1070  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1071  * @substream: the PCM substream
1072  *
1073  * After this call, all streams are changed to SUSPENDED state.
1074  */
1075 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1076 {
1077         int err;
1078         unsigned long flags;
1079
1080         if (! substream)
1081                 return 0;
1082
1083         snd_pcm_stream_lock_irqsave(substream, flags);
1084         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1085         snd_pcm_stream_unlock_irqrestore(substream, flags);
1086         return err;
1087 }
1088
1089 EXPORT_SYMBOL(snd_pcm_suspend);
1090
1091 /**
1092  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1093  * @pcm: the PCM instance
1094  *
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 - prepare the PCM substream to be triggerable
1317  * @substream: the PCM substream instance
1318  * @file: file to refer f_flags
1319  */
1320 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1321                            struct file *file)
1322 {
1323         int res;
1324         struct snd_card *card = substream->pcm->card;
1325         int f_flags;
1326
1327         if (file)
1328                 f_flags = file->f_flags;
1329         else
1330                 f_flags = substream->f_flags;
1331
1332         snd_power_lock(card);
1333         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1334                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1335                                                substream, f_flags);
1336         snd_power_unlock(card);
1337         return res;
1338 }
1339
1340 /*
1341  * drain ioctl
1342  */
1343
1344 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1345 {
1346         substream->runtime->trigger_master = substream;
1347         return 0;
1348 }
1349
1350 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1351 {
1352         struct snd_pcm_runtime *runtime = substream->runtime;
1353         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1354                 switch (runtime->status->state) {
1355                 case SNDRV_PCM_STATE_PREPARED:
1356                         /* start playback stream if possible */
1357                         if (! snd_pcm_playback_empty(substream)) {
1358                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1359                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1360                         }
1361                         break;
1362                 case SNDRV_PCM_STATE_RUNNING:
1363                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1364                         break;
1365                 default:
1366                         break;
1367                 }
1368         } else {
1369                 /* stop running stream */
1370                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1371                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1372                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1373                         snd_pcm_do_stop(substream, new_state);
1374                         snd_pcm_post_stop(substream, new_state);
1375                 }
1376         }
1377         return 0;
1378 }
1379
1380 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1381 {
1382 }
1383
1384 static struct action_ops snd_pcm_action_drain_init = {
1385         .pre_action = snd_pcm_pre_drain_init,
1386         .do_action = snd_pcm_do_drain_init,
1387         .post_action = snd_pcm_post_drain_init
1388 };
1389
1390 struct drain_rec {
1391         struct snd_pcm_substream *substream;
1392         wait_queue_t wait;
1393 };
1394
1395 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1396
1397 /*
1398  * Drain the stream(s).
1399  * When the substream is linked, sync until the draining of all playback streams
1400  * is finished.
1401  * After this call, all streams are supposed to be either SETUP or DRAINING
1402  * (capture only) state.
1403  */
1404 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1405                          struct file *file)
1406 {
1407         struct snd_card *card;
1408         struct snd_pcm_runtime *runtime;
1409         struct snd_pcm_substream *s;
1410         int result = 0;
1411         int i, num_drecs;
1412         int nonblock = 0;
1413         struct drain_rec *drec, drec_tmp, *d;
1414
1415         card = substream->pcm->card;
1416         runtime = substream->runtime;
1417
1418         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1419                 return -EBADFD;
1420
1421         snd_power_lock(card);
1422         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1423                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1424                 if (result < 0) {
1425                         snd_power_unlock(card);
1426                         return result;
1427                 }
1428         }
1429
1430         if (file) {
1431                 if (file->f_flags & O_NONBLOCK)
1432                         nonblock = 1;
1433         } else if (substream->f_flags & O_NONBLOCK)
1434                 nonblock = 1;
1435
1436         if (nonblock)
1437                 goto lock; /* no need to allocate waitqueues */
1438
1439         /* allocate temporary record for drain sync */
1440         down_read(&snd_pcm_link_rwsem);
1441         if (snd_pcm_stream_linked(substream)) {
1442                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1443                 if (! drec) {
1444                         up_read(&snd_pcm_link_rwsem);
1445                         snd_power_unlock(card);
1446                         return -ENOMEM;
1447                 }
1448         } else
1449                 drec = &drec_tmp;
1450
1451         /* count only playback streams */
1452         num_drecs = 0;
1453         snd_pcm_group_for_each_entry(s, substream) {
1454                 runtime = s->runtime;
1455                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1456                         d = &drec[num_drecs++];
1457                         d->substream = s;
1458                         init_waitqueue_entry(&d->wait, current);
1459                         add_wait_queue(&runtime->sleep, &d->wait);
1460                 }
1461         }
1462         up_read(&snd_pcm_link_rwsem);
1463
1464  lock:
1465         snd_pcm_stream_lock_irq(substream);
1466         /* resume pause */
1467         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1468                 snd_pcm_pause(substream, 0);
1469
1470         /* pre-start/stop - all running streams are changed to DRAINING state */
1471         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1472         if (result < 0)
1473                 goto unlock;
1474         /* in non-blocking, we don't wait in ioctl but let caller poll */
1475         if (nonblock) {
1476                 result = -EAGAIN;
1477                 goto unlock;
1478         }
1479
1480         for (;;) {
1481                 long tout;
1482                 if (signal_pending(current)) {
1483                         result = -ERESTARTSYS;
1484                         break;
1485                 }
1486                 /* all finished? */
1487                 for (i = 0; i < num_drecs; i++) {
1488                         runtime = drec[i].substream->runtime;
1489                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1490                                 break;
1491                 }
1492                 if (i == num_drecs)
1493                         break; /* yes, all drained */
1494
1495                 set_current_state(TASK_INTERRUPTIBLE);
1496                 snd_pcm_stream_unlock_irq(substream);
1497                 snd_power_unlock(card);
1498                 tout = schedule_timeout(10 * HZ);
1499                 snd_power_lock(card);
1500                 snd_pcm_stream_lock_irq(substream);
1501                 if (tout == 0) {
1502                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1503                                 result = -ESTRPIPE;
1504                         else {
1505                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1506                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1507                                 result = -EIO;
1508                         }
1509                         break;
1510                 }
1511         }
1512
1513  unlock:
1514         snd_pcm_stream_unlock_irq(substream);
1515
1516         if (!nonblock) {
1517                 for (i = 0; i < num_drecs; i++) {
1518                         d = &drec[i];
1519                         runtime = d->substream->runtime;
1520                         remove_wait_queue(&runtime->sleep, &d->wait);
1521                 }
1522                 if (drec != &drec_tmp)
1523                         kfree(drec);
1524         }
1525         snd_power_unlock(card);
1526
1527         return result;
1528 }
1529
1530 /*
1531  * drop ioctl
1532  *
1533  * Immediately put all linked substreams into SETUP state.
1534  */
1535 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1536 {
1537         struct snd_pcm_runtime *runtime;
1538         struct snd_card *card;
1539         int result = 0;
1540
1541         if (PCM_RUNTIME_CHECK(substream))
1542                 return -ENXIO;
1543         runtime = substream->runtime;
1544         card = substream->pcm->card;
1545
1546         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1547             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1548             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1549                 return -EBADFD;
1550
1551         snd_pcm_stream_lock_irq(substream);
1552         /* resume pause */
1553         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1554                 snd_pcm_pause(substream, 0);
1555
1556         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1557         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1558         snd_pcm_stream_unlock_irq(substream);
1559
1560         return result;
1561 }
1562
1563
1564 /* WARNING: Don't forget to fput back the file */
1565 static struct file *snd_pcm_file_fd(int fd)
1566 {
1567         struct file *file;
1568         struct inode *inode;
1569         unsigned int minor;
1570
1571         file = fget(fd);
1572         if (!file)
1573                 return NULL;
1574         inode = file->f_path.dentry->d_inode;
1575         if (!S_ISCHR(inode->i_mode) ||
1576             imajor(inode) != snd_major) {
1577                 fput(file);
1578                 return NULL;
1579         }
1580         minor = iminor(inode);
1581         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1582             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1583                 fput(file);
1584                 return NULL;
1585         }
1586         return file;
1587 }
1588
1589 /*
1590  * PCM link handling
1591  */
1592 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1593 {
1594         int res = 0;
1595         struct file *file;
1596         struct snd_pcm_file *pcm_file;
1597         struct snd_pcm_substream *substream1;
1598
1599         file = snd_pcm_file_fd(fd);
1600         if (!file)
1601                 return -EBADFD;
1602         pcm_file = file->private_data;
1603         substream1 = pcm_file->substream;
1604         down_write(&snd_pcm_link_rwsem);
1605         write_lock_irq(&snd_pcm_link_rwlock);
1606         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1607             substream->runtime->status->state != substream1->runtime->status->state) {
1608                 res = -EBADFD;
1609                 goto _end;
1610         }
1611         if (snd_pcm_stream_linked(substream1)) {
1612                 res = -EALREADY;
1613                 goto _end;
1614         }
1615         if (!snd_pcm_stream_linked(substream)) {
1616                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1617                 if (substream->group == NULL) {
1618                         res = -ENOMEM;
1619                         goto _end;
1620                 }
1621                 spin_lock_init(&substream->group->lock);
1622                 INIT_LIST_HEAD(&substream->group->substreams);
1623                 list_add_tail(&substream->link_list, &substream->group->substreams);
1624                 substream->group->count = 1;
1625         }
1626         list_add_tail(&substream1->link_list, &substream->group->substreams);
1627         substream->group->count++;
1628         substream1->group = substream->group;
1629  _end:
1630         write_unlock_irq(&snd_pcm_link_rwlock);
1631         up_write(&snd_pcm_link_rwsem);
1632         fput(file);
1633         return res;
1634 }
1635
1636 static void relink_to_local(struct snd_pcm_substream *substream)
1637 {
1638         substream->group = &substream->self_group;
1639         INIT_LIST_HEAD(&substream->self_group.substreams);
1640         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1641 }
1642
1643 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1644 {
1645         struct snd_pcm_substream *s;
1646         int res = 0;
1647
1648         down_write(&snd_pcm_link_rwsem);
1649         write_lock_irq(&snd_pcm_link_rwlock);
1650         if (!snd_pcm_stream_linked(substream)) {
1651                 res = -EALREADY;
1652                 goto _end;
1653         }
1654         list_del(&substream->link_list);
1655         substream->group->count--;
1656         if (substream->group->count == 1) {     /* detach the last stream, too */
1657                 snd_pcm_group_for_each_entry(s, substream) {
1658                         relink_to_local(s);
1659                         break;
1660                 }
1661                 kfree(substream->group);
1662         }
1663         relink_to_local(substream);
1664        _end:
1665         write_unlock_irq(&snd_pcm_link_rwlock);
1666         up_write(&snd_pcm_link_rwsem);
1667         return res;
1668 }
1669
1670 /*
1671  * hw configurator
1672  */
1673 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1674                                struct snd_pcm_hw_rule *rule)
1675 {
1676         struct snd_interval t;
1677         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1678                      hw_param_interval_c(params, rule->deps[1]), &t);
1679         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1680 }
1681
1682 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1683                                struct snd_pcm_hw_rule *rule)
1684 {
1685         struct snd_interval t;
1686         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1687                      hw_param_interval_c(params, rule->deps[1]), &t);
1688         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689 }
1690
1691 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1692                                    struct snd_pcm_hw_rule *rule)
1693 {
1694         struct snd_interval t;
1695         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1696                          hw_param_interval_c(params, rule->deps[1]),
1697                          (unsigned long) rule->private, &t);
1698         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1699 }
1700
1701 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1702                                    struct snd_pcm_hw_rule *rule)
1703 {
1704         struct snd_interval t;
1705         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1706                          (unsigned long) rule->private,
1707                          hw_param_interval_c(params, rule->deps[1]), &t);
1708         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1709 }
1710
1711 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1712                                   struct snd_pcm_hw_rule *rule)
1713 {
1714         unsigned int k;
1715         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1716         struct snd_mask m;
1717         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1718         snd_mask_any(&m);
1719         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1720                 int bits;
1721                 if (! snd_mask_test(mask, k))
1722                         continue;
1723                 bits = snd_pcm_format_physical_width(k);
1724                 if (bits <= 0)
1725                         continue; /* ignore invalid formats */
1726                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1727                         snd_mask_reset(&m, k);
1728         }
1729         return snd_mask_refine(mask, &m);
1730 }
1731
1732 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1733                                        struct snd_pcm_hw_rule *rule)
1734 {
1735         struct snd_interval t;
1736         unsigned int k;
1737         t.min = UINT_MAX;
1738         t.max = 0;
1739         t.openmin = 0;
1740         t.openmax = 0;
1741         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1742                 int bits;
1743                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1744                         continue;
1745                 bits = snd_pcm_format_physical_width(k);
1746                 if (bits <= 0)
1747                         continue; /* ignore invalid formats */
1748                 if (t.min > (unsigned)bits)
1749                         t.min = bits;
1750                 if (t.max < (unsigned)bits)
1751                         t.max = bits;
1752         }
1753         t.integer = 1;
1754         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1755 }
1756
1757 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1758 #error "Change this table"
1759 #endif
1760
1761 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1762                                  48000, 64000, 88200, 96000, 176400, 192000 };
1763
1764 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1765         .count = ARRAY_SIZE(rates),
1766         .list = rates,
1767 };
1768
1769 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1770                                 struct snd_pcm_hw_rule *rule)
1771 {
1772         struct snd_pcm_hardware *hw = rule->private;
1773         return snd_interval_list(hw_param_interval(params, rule->var),
1774                                  snd_pcm_known_rates.count,
1775                                  snd_pcm_known_rates.list, hw->rates);
1776 }
1777
1778 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1779                                             struct snd_pcm_hw_rule *rule)
1780 {
1781         struct snd_interval t;
1782         struct snd_pcm_substream *substream = rule->private;
1783         t.min = 0;
1784         t.max = substream->buffer_bytes_max;
1785         t.openmin = 0;
1786         t.openmax = 0;
1787         t.integer = 1;
1788         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1789 }
1790
1791 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1792 {
1793         struct snd_pcm_runtime *runtime = substream->runtime;
1794         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1795         int k, err;
1796
1797         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1798                 snd_mask_any(constrs_mask(constrs, k));
1799         }
1800
1801         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1802                 snd_interval_any(constrs_interval(constrs, k));
1803         }
1804
1805         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1806         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1807         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1808         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1809         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1810
1811         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1812                                    snd_pcm_hw_rule_format, NULL,
1813                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1814         if (err < 0)
1815                 return err;
1816         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1817                                   snd_pcm_hw_rule_sample_bits, NULL,
1818                                   SNDRV_PCM_HW_PARAM_FORMAT,
1819                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1820         if (err < 0)
1821                 return err;
1822         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1823                                   snd_pcm_hw_rule_div, NULL,
1824                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1825         if (err < 0)
1826                 return err;
1827         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1828                                   snd_pcm_hw_rule_mul, NULL,
1829                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1830         if (err < 0)
1831                 return err;
1832         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1833                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1834                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1835         if (err < 0)
1836                 return err;
1837         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1838                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1839                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1840         if (err < 0)
1841                 return err;
1842         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1843                                   snd_pcm_hw_rule_div, NULL,
1844                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1845         if (err < 0)
1846                 return err;
1847         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1848                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1849                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1850         if (err < 0)
1851                 return err;
1852         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1853                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1854                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1855         if (err < 0)
1856                 return err;
1857         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1858                                   snd_pcm_hw_rule_div, NULL,
1859                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1860         if (err < 0)
1861                 return err;
1862         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1863                                   snd_pcm_hw_rule_div, NULL,
1864                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1865         if (err < 0)
1866                 return err;
1867         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1868                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1869                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1870         if (err < 0)
1871                 return err;
1872         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1873                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1874                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1875         if (err < 0)
1876                 return err;
1877         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1878                                   snd_pcm_hw_rule_mul, NULL,
1879                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1880         if (err < 0)
1881                 return err;
1882         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1883                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1884                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1885         if (err < 0)
1886                 return err;
1887         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1888                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1889                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1890         if (err < 0)
1891                 return err;
1892         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1893                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1894                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1895         if (err < 0)
1896                 return err;
1897         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1898                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1899                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1900         if (err < 0)
1901                 return err;
1902         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1903                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1904                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1905         if (err < 0)
1906                 return err;
1907         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1908                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1909                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1910         if (err < 0)
1911                 return err;
1912         return 0;
1913 }
1914
1915 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1916 {
1917         struct snd_pcm_runtime *runtime = substream->runtime;
1918         struct snd_pcm_hardware *hw = &runtime->hw;
1919         int err;
1920         unsigned int mask = 0;
1921
1922         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1923                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1924         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1925                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1926         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1927                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1928                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1929                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1930                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1931                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1932                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1933         }
1934         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1935         if (err < 0)
1936                 return err;
1937
1938         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1939         if (err < 0)
1940                 return err;
1941
1942         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1943         if (err < 0)
1944                 return err;
1945
1946         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1947                                            hw->channels_min, hw->channels_max);
1948         if (err < 0)
1949                 return err;
1950
1951         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1952                                            hw->rate_min, hw->rate_max);
1953          if (err < 0)
1954                  return err;
1955
1956         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1957                                            hw->period_bytes_min, hw->period_bytes_max);
1958          if (err < 0)
1959                  return err;
1960
1961         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1962                                            hw->periods_min, hw->periods_max);
1963         if (err < 0)
1964                 return err;
1965
1966         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1967                                            hw->period_bytes_min, hw->buffer_bytes_max);
1968         if (err < 0)
1969                 return err;
1970
1971         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1972                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1973                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1974         if (err < 0)
1975                 return err;
1976
1977         /* FIXME: remove */
1978         if (runtime->dma_bytes) {
1979                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1980                 if (err < 0)
1981                         return -EINVAL;
1982         }
1983
1984         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1985                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1986                                           snd_pcm_hw_rule_rate, hw,
1987                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1988                 if (err < 0)
1989                         return err;
1990         }
1991
1992         /* FIXME: this belong to lowlevel */
1993         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1994
1995         return 0;
1996 }
1997
1998 static void pcm_release_private(struct snd_pcm_substream *substream)
1999 {
2000         snd_pcm_unlink(substream);
2001 }
2002
2003 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2004 {
2005         substream->ref_count--;
2006         if (substream->ref_count > 0)
2007                 return;
2008
2009         snd_pcm_drop(substream);
2010         if (substream->hw_opened) {
2011                 if (substream->ops->hw_free != NULL)
2012                         substream->ops->hw_free(substream);
2013                 substream->ops->close(substream);
2014                 substream->hw_opened = 0;
2015         }
2016         if (substream->pcm_release) {
2017                 substream->pcm_release(substream);
2018                 substream->pcm_release = NULL;
2019         }
2020         snd_pcm_detach_substream(substream);
2021 }
2022
2023 EXPORT_SYMBOL(snd_pcm_release_substream);
2024
2025 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2026                            struct file *file,
2027                            struct snd_pcm_substream **rsubstream)
2028 {
2029         struct snd_pcm_substream *substream;
2030         int err;
2031
2032         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2033         if (err < 0)
2034                 return err;
2035         if (substream->ref_count > 1) {
2036                 *rsubstream = substream;
2037                 return 0;
2038         }
2039
2040         err = snd_pcm_hw_constraints_init(substream);
2041         if (err < 0) {
2042                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2043                 goto error;
2044         }
2045
2046         if ((err = substream->ops->open(substream)) < 0)
2047                 goto error;
2048
2049         substream->hw_opened = 1;
2050
2051         err = snd_pcm_hw_constraints_complete(substream);
2052         if (err < 0) {
2053                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2054                 goto error;
2055         }
2056
2057         *rsubstream = substream;
2058         return 0;
2059
2060  error:
2061         snd_pcm_release_substream(substream);
2062         return err;
2063 }
2064
2065 EXPORT_SYMBOL(snd_pcm_open_substream);
2066
2067 static int snd_pcm_open_file(struct file *file,
2068                              struct snd_pcm *pcm,
2069                              int stream,
2070                              struct snd_pcm_file **rpcm_file)
2071 {
2072         struct snd_pcm_file *pcm_file;
2073         struct snd_pcm_substream *substream;
2074         struct snd_pcm_str *str;
2075         int err;
2076
2077         if (rpcm_file)
2078                 *rpcm_file = NULL;
2079
2080         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2081         if (err < 0)
2082                 return err;
2083
2084         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2085         if (pcm_file == NULL) {
2086                 snd_pcm_release_substream(substream);
2087                 return -ENOMEM;
2088         }
2089         pcm_file->substream = substream;
2090         if (substream->ref_count == 1) {
2091                 str = substream->pstr;
2092                 substream->file = pcm_file;
2093                 substream->pcm_release = pcm_release_private;
2094         }
2095         file->private_data = pcm_file;
2096         if (rpcm_file)
2097                 *rpcm_file = pcm_file;
2098         return 0;
2099 }
2100
2101 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2102 {
2103         struct snd_pcm *pcm;
2104
2105         pcm = snd_lookup_minor_data(iminor(inode),
2106                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2107         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2108 }
2109
2110 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2111 {
2112         struct snd_pcm *pcm;
2113
2114         pcm = snd_lookup_minor_data(iminor(inode),
2115                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2116         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2117 }
2118
2119 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2120 {
2121         int err;
2122         struct snd_pcm_file *pcm_file;
2123         wait_queue_t wait;
2124
2125         if (pcm == NULL) {
2126                 err = -ENODEV;
2127                 goto __error1;
2128         }
2129         err = snd_card_file_add(pcm->card, file);
2130         if (err < 0)
2131                 goto __error1;
2132         if (!try_module_get(pcm->card->module)) {
2133                 err = -EFAULT;
2134                 goto __error2;
2135         }
2136         init_waitqueue_entry(&wait, current);
2137         add_wait_queue(&pcm->open_wait, &wait);
2138         mutex_lock(&pcm->open_mutex);
2139         while (1) {
2140                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2141                 if (err >= 0)
2142                         break;
2143                 if (err == -EAGAIN) {
2144                         if (file->f_flags & O_NONBLOCK) {
2145                                 err = -EBUSY;
2146                                 break;
2147                         }
2148                 } else
2149                         break;
2150                 set_current_state(TASK_INTERRUPTIBLE);
2151                 mutex_unlock(&pcm->open_mutex);
2152                 schedule();
2153                 mutex_lock(&pcm->open_mutex);
2154                 if (signal_pending(current)) {
2155                         err = -ERESTARTSYS;
2156                         break;
2157                 }
2158         }
2159         remove_wait_queue(&pcm->open_wait, &wait);
2160         mutex_unlock(&pcm->open_mutex);
2161         if (err < 0)
2162                 goto __error;
2163         return err;
2164
2165       __error:
2166         module_put(pcm->card->module);
2167       __error2:
2168         snd_card_file_remove(pcm->card, file);
2169       __error1:
2170         return err;
2171 }
2172
2173 static int snd_pcm_release(struct inode *inode, struct file *file)
2174 {
2175         struct snd_pcm *pcm;
2176         struct snd_pcm_substream *substream;
2177         struct snd_pcm_file *pcm_file;
2178
2179         pcm_file = file->private_data;
2180         substream = pcm_file->substream;
2181         if (snd_BUG_ON(!substream))
2182                 return -ENXIO;
2183         pcm = substream->pcm;
2184         mutex_lock(&pcm->open_mutex);
2185         snd_pcm_release_substream(substream);
2186         kfree(pcm_file);
2187         mutex_unlock(&pcm->open_mutex);
2188         wake_up(&pcm->open_wait);
2189         module_put(pcm->card->module);
2190         snd_card_file_remove(pcm->card, file);
2191         return 0;
2192 }
2193
2194 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2195                                                  snd_pcm_uframes_t frames)
2196 {
2197         struct snd_pcm_runtime *runtime = substream->runtime;
2198         snd_pcm_sframes_t appl_ptr;
2199         snd_pcm_sframes_t ret;
2200         snd_pcm_sframes_t hw_avail;
2201
2202         if (frames == 0)
2203                 return 0;
2204
2205         snd_pcm_stream_lock_irq(substream);
2206         switch (runtime->status->state) {
2207         case SNDRV_PCM_STATE_PREPARED:
2208                 break;
2209         case SNDRV_PCM_STATE_DRAINING:
2210         case SNDRV_PCM_STATE_RUNNING:
2211                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2212                         break;
2213                 /* Fall through */
2214         case SNDRV_PCM_STATE_XRUN:
2215                 ret = -EPIPE;
2216                 goto __end;
2217         default:
2218                 ret = -EBADFD;
2219                 goto __end;
2220         }
2221
2222         hw_avail = snd_pcm_playback_hw_avail(runtime);
2223         if (hw_avail <= 0) {
2224                 ret = 0;
2225                 goto __end;
2226         }
2227         if (frames > (snd_pcm_uframes_t)hw_avail)
2228                 frames = hw_avail;
2229         appl_ptr = runtime->control->appl_ptr - frames;
2230         if (appl_ptr < 0)
2231                 appl_ptr += runtime->boundary;
2232         runtime->control->appl_ptr = appl_ptr;
2233         ret = frames;
2234  __end:
2235         snd_pcm_stream_unlock_irq(substream);
2236         return ret;
2237 }
2238
2239 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2240                                                 snd_pcm_uframes_t frames)
2241 {
2242         struct snd_pcm_runtime *runtime = substream->runtime;
2243         snd_pcm_sframes_t appl_ptr;
2244         snd_pcm_sframes_t ret;
2245         snd_pcm_sframes_t hw_avail;
2246
2247         if (frames == 0)
2248                 return 0;
2249
2250         snd_pcm_stream_lock_irq(substream);
2251         switch (runtime->status->state) {
2252         case SNDRV_PCM_STATE_PREPARED:
2253         case SNDRV_PCM_STATE_DRAINING:
2254                 break;
2255         case SNDRV_PCM_STATE_RUNNING:
2256                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2257                         break;
2258                 /* Fall through */
2259         case SNDRV_PCM_STATE_XRUN:
2260                 ret = -EPIPE;
2261                 goto __end;
2262         default:
2263                 ret = -EBADFD;
2264                 goto __end;
2265         }
2266
2267         hw_avail = snd_pcm_capture_hw_avail(runtime);
2268         if (hw_avail <= 0) {
2269                 ret = 0;
2270                 goto __end;
2271         }
2272         if (frames > (snd_pcm_uframes_t)hw_avail)
2273                 frames = hw_avail;
2274         appl_ptr = runtime->control->appl_ptr - frames;
2275         if (appl_ptr < 0)
2276                 appl_ptr += runtime->boundary;
2277         runtime->control->appl_ptr = appl_ptr;
2278         ret = frames;
2279  __end:
2280         snd_pcm_stream_unlock_irq(substream);
2281         return ret;
2282 }
2283
2284 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2285                                                   snd_pcm_uframes_t frames)
2286 {
2287         struct snd_pcm_runtime *runtime = substream->runtime;
2288         snd_pcm_sframes_t appl_ptr;
2289         snd_pcm_sframes_t ret;
2290         snd_pcm_sframes_t avail;
2291
2292         if (frames == 0)
2293                 return 0;
2294
2295         snd_pcm_stream_lock_irq(substream);
2296         switch (runtime->status->state) {
2297         case SNDRV_PCM_STATE_PREPARED:
2298         case SNDRV_PCM_STATE_PAUSED:
2299                 break;
2300         case SNDRV_PCM_STATE_DRAINING:
2301         case SNDRV_PCM_STATE_RUNNING:
2302                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2303                         break;
2304                 /* Fall through */
2305         case SNDRV_PCM_STATE_XRUN:
2306                 ret = -EPIPE;
2307                 goto __end;
2308         default:
2309                 ret = -EBADFD;
2310                 goto __end;
2311         }
2312
2313         avail = snd_pcm_playback_avail(runtime);
2314         if (avail <= 0) {
2315                 ret = 0;
2316                 goto __end;
2317         }
2318         if (frames > (snd_pcm_uframes_t)avail)
2319                 frames = avail;
2320         appl_ptr = runtime->control->appl_ptr + frames;
2321         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2322                 appl_ptr -= runtime->boundary;
2323         runtime->control->appl_ptr = appl_ptr;
2324         ret = frames;
2325  __end:
2326         snd_pcm_stream_unlock_irq(substream);
2327         return ret;
2328 }
2329
2330 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2331                                                  snd_pcm_uframes_t frames)
2332 {
2333         struct snd_pcm_runtime *runtime = substream->runtime;
2334         snd_pcm_sframes_t appl_ptr;
2335         snd_pcm_sframes_t ret;
2336         snd_pcm_sframes_t avail;
2337
2338         if (frames == 0)
2339                 return 0;
2340
2341         snd_pcm_stream_lock_irq(substream);
2342         switch (runtime->status->state) {
2343         case SNDRV_PCM_STATE_PREPARED:
2344         case SNDRV_PCM_STATE_DRAINING:
2345         case SNDRV_PCM_STATE_PAUSED:
2346                 break;
2347         case SNDRV_PCM_STATE_RUNNING:
2348                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2349                         break;
2350                 /* Fall through */
2351         case SNDRV_PCM_STATE_XRUN:
2352                 ret = -EPIPE;
2353                 goto __end;
2354         default:
2355                 ret = -EBADFD;
2356                 goto __end;
2357         }
2358
2359         avail = snd_pcm_capture_avail(runtime);
2360         if (avail <= 0) {
2361                 ret = 0;
2362                 goto __end;
2363         }
2364         if (frames > (snd_pcm_uframes_t)avail)
2365                 frames = avail;
2366         appl_ptr = runtime->control->appl_ptr + frames;
2367         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2368                 appl_ptr -= runtime->boundary;
2369         runtime->control->appl_ptr = appl_ptr;
2370         ret = frames;
2371  __end:
2372         snd_pcm_stream_unlock_irq(substream);
2373         return ret;
2374 }
2375
2376 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2377 {
2378         struct snd_pcm_runtime *runtime = substream->runtime;
2379         int err;
2380
2381         snd_pcm_stream_lock_irq(substream);
2382         switch (runtime->status->state) {
2383         case SNDRV_PCM_STATE_DRAINING:
2384                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2385                         goto __badfd;
2386         case SNDRV_PCM_STATE_RUNNING:
2387                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2388                         break;
2389                 /* Fall through */
2390         case SNDRV_PCM_STATE_PREPARED:
2391         case SNDRV_PCM_STATE_SUSPENDED:
2392                 err = 0;
2393                 break;
2394         case SNDRV_PCM_STATE_XRUN:
2395                 err = -EPIPE;
2396                 break;
2397         default:
2398               __badfd:
2399                 err = -EBADFD;
2400                 break;
2401         }
2402         snd_pcm_stream_unlock_irq(substream);
2403         return err;
2404 }
2405
2406 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2407                          snd_pcm_sframes_t __user *res)
2408 {
2409         struct snd_pcm_runtime *runtime = substream->runtime;
2410         int err;
2411         snd_pcm_sframes_t n = 0;
2412
2413         snd_pcm_stream_lock_irq(substream);
2414         switch (runtime->status->state) {
2415         case SNDRV_PCM_STATE_DRAINING:
2416                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2417                         goto __badfd;
2418         case SNDRV_PCM_STATE_RUNNING:
2419                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2420                         break;
2421                 /* Fall through */
2422         case SNDRV_PCM_STATE_PREPARED:
2423         case SNDRV_PCM_STATE_SUSPENDED:
2424                 err = 0;
2425                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2426                         n = snd_pcm_playback_hw_avail(runtime);
2427                 else
2428                         n = snd_pcm_capture_avail(runtime);
2429                 n += runtime->delay;
2430                 break;
2431         case SNDRV_PCM_STATE_XRUN:
2432                 err = -EPIPE;
2433                 break;
2434         default:
2435               __badfd:
2436                 err = -EBADFD;
2437                 break;
2438         }
2439         snd_pcm_stream_unlock_irq(substream);
2440         if (!err)
2441                 if (put_user(n, res))
2442                         err = -EFAULT;
2443         return err;
2444 }
2445
2446 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2447                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2448 {
2449         struct snd_pcm_runtime *runtime = substream->runtime;
2450         struct snd_pcm_sync_ptr sync_ptr;
2451         volatile struct snd_pcm_mmap_status *status;
2452         volatile struct snd_pcm_mmap_control *control;
2453         int err;
2454
2455         memset(&sync_ptr, 0, sizeof(sync_ptr));
2456         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2457                 return -EFAULT;
2458         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2459                 return -EFAULT;
2460         status = runtime->status;
2461         control = runtime->control;
2462         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2463                 err = snd_pcm_hwsync(substream);
2464                 if (err < 0)
2465                         return err;
2466         }
2467         snd_pcm_stream_lock_irq(substream);
2468         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2469                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2470         else
2471                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2472         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2473                 control->avail_min = sync_ptr.c.control.avail_min;
2474         else
2475                 sync_ptr.c.control.avail_min = control->avail_min;
2476         sync_ptr.s.status.state = status->state;
2477         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2478         sync_ptr.s.status.tstamp = status->tstamp;
2479         sync_ptr.s.status.suspended_state = status->suspended_state;
2480         snd_pcm_stream_unlock_irq(substream);
2481         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2482                 return -EFAULT;
2483         return 0;
2484 }
2485
2486 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2487 {
2488         struct snd_pcm_runtime *runtime = substream->runtime;
2489         int arg;
2490
2491         if (get_user(arg, _arg))
2492                 return -EFAULT;
2493         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2494                 return -EINVAL;
2495         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2496         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2497                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2498         return 0;
2499 }
2500
2501 static int snd_pcm_common_ioctl1(struct file *file,
2502                                  struct snd_pcm_substream *substream,
2503                                  unsigned int cmd, void __user *arg)
2504 {
2505         switch (cmd) {
2506         case SNDRV_PCM_IOCTL_PVERSION:
2507                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2508         case SNDRV_PCM_IOCTL_INFO:
2509                 return snd_pcm_info_user(substream, arg);
2510         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2511                 return 0;
2512         case SNDRV_PCM_IOCTL_TTSTAMP:
2513                 return snd_pcm_tstamp(substream, arg);
2514         case SNDRV_PCM_IOCTL_HW_REFINE:
2515                 return snd_pcm_hw_refine_user(substream, arg);
2516         case SNDRV_PCM_IOCTL_HW_PARAMS:
2517                 return snd_pcm_hw_params_user(substream, arg);
2518         case SNDRV_PCM_IOCTL_HW_FREE:
2519                 return snd_pcm_hw_free(substream);
2520         case SNDRV_PCM_IOCTL_SW_PARAMS:
2521                 return snd_pcm_sw_params_user(substream, arg);
2522         case SNDRV_PCM_IOCTL_STATUS:
2523                 return snd_pcm_status_user(substream, arg);
2524         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2525                 return snd_pcm_channel_info_user(substream, arg);
2526         case SNDRV_PCM_IOCTL_PREPARE:
2527                 return snd_pcm_prepare(substream, file);
2528         case SNDRV_PCM_IOCTL_RESET:
2529                 return snd_pcm_reset(substream);
2530         case SNDRV_PCM_IOCTL_START:
2531                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2532         case SNDRV_PCM_IOCTL_LINK:
2533                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2534         case SNDRV_PCM_IOCTL_UNLINK:
2535                 return snd_pcm_unlink(substream);
2536         case SNDRV_PCM_IOCTL_RESUME:
2537                 return snd_pcm_resume(substream);
2538         case SNDRV_PCM_IOCTL_XRUN:
2539                 return snd_pcm_xrun(substream);
2540         case SNDRV_PCM_IOCTL_HWSYNC:
2541                 return snd_pcm_hwsync(substream);
2542         case SNDRV_PCM_IOCTL_DELAY:
2543                 return snd_pcm_delay(substream, arg);
2544         case SNDRV_PCM_IOCTL_SYNC_PTR:
2545                 return snd_pcm_sync_ptr(substream, arg);
2546 #ifdef CONFIG_SND_SUPPORT_OLD_API
2547         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2548                 return snd_pcm_hw_refine_old_user(substream, arg);
2549         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2550                 return snd_pcm_hw_params_old_user(substream, arg);
2551 #endif
2552         case SNDRV_PCM_IOCTL_DRAIN:
2553                 return snd_pcm_drain(substream, file);
2554         case SNDRV_PCM_IOCTL_DROP:
2555                 return snd_pcm_drop(substream);
2556         case SNDRV_PCM_IOCTL_PAUSE:
2557         {
2558                 int res;
2559                 snd_pcm_stream_lock_irq(substream);
2560                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2561                 snd_pcm_stream_unlock_irq(substream);
2562                 return res;
2563         }
2564         }
2565         snd_printd("unknown ioctl = 0x%x\n", cmd);
2566         return -ENOTTY;
2567 }
2568
2569 static int snd_pcm_playback_ioctl1(struct file *file,
2570                                    struct snd_pcm_substream *substream,
2571                                    unsigned int cmd, void __user *arg)
2572 {
2573         if (snd_BUG_ON(!substream))
2574                 return -ENXIO;
2575         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2576                 return -EINVAL;
2577         switch (cmd) {
2578         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2579         {
2580                 struct snd_xferi xferi;
2581                 struct snd_xferi __user *_xferi = arg;
2582                 struct snd_pcm_runtime *runtime = substream->runtime;
2583                 snd_pcm_sframes_t result;
2584                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2585                         return -EBADFD;
2586                 if (put_user(0, &_xferi->result))
2587                         return -EFAULT;
2588                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2589                         return -EFAULT;
2590                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2591                 __put_user(result, &_xferi->result);
2592                 return result < 0 ? result : 0;
2593         }
2594         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2595         {
2596                 struct snd_xfern xfern;
2597                 struct snd_xfern __user *_xfern = arg;
2598                 struct snd_pcm_runtime *runtime = substream->runtime;
2599                 void __user **bufs;
2600                 snd_pcm_sframes_t result;
2601                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2602                         return -EBADFD;
2603                 if (runtime->channels > 128)
2604                         return -EINVAL;
2605                 if (put_user(0, &_xfern->result))
2606                         return -EFAULT;
2607                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2608                         return -EFAULT;
2609
2610                 bufs = memdup_user(xfern.bufs,
2611                                    sizeof(void *) * runtime->channels);
2612                 if (IS_ERR(bufs))
2613                         return PTR_ERR(bufs);
2614                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2615                 kfree(bufs);
2616                 __put_user(result, &_xfern->result);
2617                 return result < 0 ? result : 0;
2618         }
2619         case SNDRV_PCM_IOCTL_REWIND:
2620         {
2621                 snd_pcm_uframes_t frames;
2622                 snd_pcm_uframes_t __user *_frames = arg;
2623                 snd_pcm_sframes_t result;
2624                 if (get_user(frames, _frames))
2625                         return -EFAULT;
2626                 if (put_user(0, _frames))
2627                         return -EFAULT;
2628                 result = snd_pcm_playback_rewind(substream, frames);
2629                 __put_user(result, _frames);
2630                 return result < 0 ? result : 0;
2631         }
2632         case SNDRV_PCM_IOCTL_FORWARD:
2633         {
2634                 snd_pcm_uframes_t frames;
2635                 snd_pcm_uframes_t __user *_frames = arg;
2636                 snd_pcm_sframes_t result;
2637                 if (get_user(frames, _frames))
2638                         return -EFAULT;
2639                 if (put_user(0, _frames))
2640                         return -EFAULT;
2641                 result = snd_pcm_playback_forward(substream, frames);
2642                 __put_user(result, _frames);
2643                 return result < 0 ? result : 0;
2644         }
2645         }
2646         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2647 }
2648
2649 static int snd_pcm_capture_ioctl1(struct file *file,
2650                                   struct snd_pcm_substream *substream,
2651                                   unsigned int cmd, void __user *arg)
2652 {
2653         if (snd_BUG_ON(!substream))
2654                 return -ENXIO;
2655         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2656                 return -EINVAL;
2657         switch (cmd) {
2658         case SNDRV_PCM_IOCTL_READI_FRAMES:
2659         {
2660                 struct snd_xferi xferi;
2661                 struct snd_xferi __user *_xferi = arg;
2662                 struct snd_pcm_runtime *runtime = substream->runtime;
2663                 snd_pcm_sframes_t result;
2664                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2665                         return -EBADFD;
2666                 if (put_user(0, &_xferi->result))
2667                         return -EFAULT;
2668                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2669                         return -EFAULT;
2670                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2671                 __put_user(result, &_xferi->result);
2672                 return result < 0 ? result : 0;
2673         }
2674         case SNDRV_PCM_IOCTL_READN_FRAMES:
2675         {
2676                 struct snd_xfern xfern;
2677                 struct snd_xfern __user *_xfern = arg;
2678                 struct snd_pcm_runtime *runtime = substream->runtime;
2679                 void *bufs;
2680                 snd_pcm_sframes_t result;
2681                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2682                         return -EBADFD;
2683                 if (runtime->channels > 128)
2684                         return -EINVAL;
2685                 if (put_user(0, &_xfern->result))
2686                         return -EFAULT;
2687                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2688                         return -EFAULT;
2689
2690                 bufs = memdup_user(xfern.bufs,
2691                                    sizeof(void *) * runtime->channels);
2692                 if (IS_ERR(bufs))
2693                         return PTR_ERR(bufs);
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         return err;
3259 }
3260
3261 /*
3262  * ioctl32 compat
3263  */
3264 #ifdef CONFIG_COMPAT
3265 #include "pcm_compat.c"
3266 #else
3267 #define snd_pcm_ioctl_compat    NULL
3268 #endif
3269
3270 /*
3271  *  To be removed helpers to keep binary compatibility
3272  */
3273
3274 #ifdef CONFIG_SND_SUPPORT_OLD_API
3275 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3276 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3277
3278 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3279                                                struct snd_pcm_hw_params_old *oparams)
3280 {
3281         unsigned int i;
3282
3283         memset(params, 0, sizeof(*params));
3284         params->flags = oparams->flags;
3285         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3286                 params->masks[i].bits[0] = oparams->masks[i];
3287         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3288         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3289         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3290         params->info = oparams->info;
3291         params->msbits = oparams->msbits;
3292         params->rate_num = oparams->rate_num;
3293         params->rate_den = oparams->rate_den;
3294         params->fifo_size = oparams->fifo_size;
3295 }
3296
3297 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3298                                              struct snd_pcm_hw_params *params)
3299 {
3300         unsigned int i;
3301
3302         memset(oparams, 0, sizeof(*oparams));
3303         oparams->flags = params->flags;
3304         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3305                 oparams->masks[i] = params->masks[i].bits[0];
3306         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3307         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3308         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3309         oparams->info = params->info;
3310         oparams->msbits = params->msbits;
3311         oparams->rate_num = params->rate_num;
3312         oparams->rate_den = params->rate_den;
3313         oparams->fifo_size = params->fifo_size;
3314 }
3315
3316 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3317                                       struct snd_pcm_hw_params_old __user * _oparams)
3318 {
3319         struct snd_pcm_hw_params *params;
3320         struct snd_pcm_hw_params_old *oparams = NULL;
3321         int err;
3322
3323         params = kmalloc(sizeof(*params), GFP_KERNEL);
3324         if (!params)
3325                 return -ENOMEM;
3326
3327         oparams = memdup_user(_oparams, sizeof(*oparams));
3328         if (IS_ERR(oparams)) {
3329                 err = PTR_ERR(oparams);
3330                 goto out;
3331         }
3332         snd_pcm_hw_convert_from_old_params(params, oparams);
3333         err = snd_pcm_hw_refine(substream, params);
3334         snd_pcm_hw_convert_to_old_params(oparams, params);
3335         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3336                 if (!err)
3337                         err = -EFAULT;
3338         }
3339
3340         kfree(oparams);
3341 out:
3342         kfree(params);
3343         return err;
3344 }
3345
3346 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3347                                       struct snd_pcm_hw_params_old __user * _oparams)
3348 {
3349         struct snd_pcm_hw_params *params;
3350         struct snd_pcm_hw_params_old *oparams = NULL;
3351         int err;
3352
3353         params = kmalloc(sizeof(*params), GFP_KERNEL);
3354         if (!params)
3355                 return -ENOMEM;
3356
3357         oparams = memdup_user(_oparams, sizeof(*oparams));
3358         if (IS_ERR(oparams)) {
3359                 err = PTR_ERR(oparams);
3360                 goto out;
3361         }
3362         snd_pcm_hw_convert_from_old_params(params, oparams);
3363         err = snd_pcm_hw_params(substream, params);
3364         snd_pcm_hw_convert_to_old_params(oparams, params);
3365         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3366                 if (!err)
3367                         err = -EFAULT;
3368         }
3369
3370         kfree(oparams);
3371 out:
3372         kfree(params);
3373         return err;
3374 }
3375 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3376
3377 #ifndef CONFIG_MMU
3378 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3379                                       unsigned long len, unsigned long pgoff,
3380                                       unsigned long flags)
3381 {
3382         return 0;
3383 }
3384 #else
3385 # define dummy_get_unmapped_area NULL
3386 #endif
3387
3388 /*
3389  *  Register section
3390  */
3391
3392 const struct file_operations snd_pcm_f_ops[2] = {
3393         {
3394                 .owner =                THIS_MODULE,
3395                 .write =                snd_pcm_write,
3396                 .aio_write =            snd_pcm_aio_write,
3397                 .open =                 snd_pcm_playback_open,
3398                 .release =              snd_pcm_release,
3399                 .poll =                 snd_pcm_playback_poll,
3400                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3401                 .compat_ioctl =         snd_pcm_ioctl_compat,
3402                 .mmap =                 snd_pcm_mmap,
3403                 .fasync =               snd_pcm_fasync,
3404                 .get_unmapped_area =    dummy_get_unmapped_area,
3405         },
3406         {
3407                 .owner =                THIS_MODULE,
3408                 .read =                 snd_pcm_read,
3409                 .aio_read =             snd_pcm_aio_read,
3410                 .open =                 snd_pcm_capture_open,
3411                 .release =              snd_pcm_release,
3412                 .poll =                 snd_pcm_capture_poll,
3413                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3414                 .compat_ioctl =         snd_pcm_ioctl_compat,
3415                 .mmap =                 snd_pcm_mmap,
3416                 .fasync =               snd_pcm_fasync,
3417                 .get_unmapped_area =    dummy_get_unmapped_area,
3418         }
3419 };