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