git.oblomov.eu Git - linux-2.6/blob - sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <linux/latency.h>
  27 #include <linux/uio.h>
  28 #include <sound/core.h>
  29 #include <sound/control.h>
  30 #include <sound/info.h>
  31 #include <sound/pcm.h>
  32 #include <sound/pcm_params.h>
  33 #include <sound/timer.h>
  34 #include <sound/minors.h>
  35 #include <asm/io.h>
  36
  37 /*
  38  *  Compatibility
  39  */
  40
  41 struct snd_pcm_hw_params_old {
  42         unsigned int flags;
  43         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  44                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  45         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  46                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  47         unsigned int rmask;
  48         unsigned int cmask;
  49         unsigned int info;
  50         unsigned int msbits;
  51         unsigned int rate_num;
  52         unsigned int rate_den;
  53         snd_pcm_uframes_t fifo_size;
  54         unsigned char reserved[64];
  55 };
  56
  57 #ifdef CONFIG_SND_SUPPORT_OLD_API
  58 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  59 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  60
  61 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  62                                       struct snd_pcm_hw_params_old __user * _oparams);
  63 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  64                                       struct snd_pcm_hw_params_old __user * _oparams);
  65 #endif
  66 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  67
  68 /*
  69  *
  70  */
  71
  72 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  73 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  74
  75 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  76
  77 static inline mm_segment_t snd_enter_user(void)
  78 {
  79         mm_segment_t fs = get_fs();
  80         set_fs(get_ds());
  81         return fs;
  82 }
  83
  84 static inline void snd_leave_user(mm_segment_t fs)
  85 {
  86         set_fs(fs);
  87 }
  88
  89
  90
  91 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  92 {
  93         struct snd_pcm_runtime *runtime;
  94         struct snd_pcm *pcm = substream->pcm;
  95         struct snd_pcm_str *pstr = substream->pstr;
  96
  97         snd_assert(substream != NULL, return -ENXIO);
  98         memset(info, 0, sizeof(*info));
  99         info->card = pcm->card->number;
 100         info->device = pcm->device;
 101         info->stream = substream->stream;
 102         info->subdevice = substream->number;
 103         strlcpy(info->id, pcm->id, sizeof(info->id));
 104         strlcpy(info->name, pcm->name, sizeof(info->name));
 105         info->dev_class = pcm->dev_class;
 106         info->dev_subclass = pcm->dev_subclass;
 107         info->subdevices_count = pstr->substream_count;
 108         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 109         strlcpy(info->subname, substream->name, sizeof(info->subname));
 110         runtime = substream->runtime;
 111         /* AB: FIXME!!! This is definitely nonsense */
 112         if (runtime) {
 113                 info->sync = runtime->sync;
 114                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 115         }
 116         return 0;
 117 }
 118
 119 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 120                       struct snd_pcm_info __user * _info)
 121 {
 122         struct snd_pcm_info *info;
 123         int err;
 124
 125         info = kmalloc(sizeof(*info), GFP_KERNEL);
 126         if (! info)
 127                 return -ENOMEM;
 128         err = snd_pcm_info(substream, info);
 129         if (err >= 0) {
 130                 if (copy_to_user(_info, info, sizeof(*info)))
 131                         err = -EFAULT;
 132         }
 133         kfree(info);
 134         return err;
 135 }
 136
 137 #undef RULES_DEBUG
 138
 139 #ifdef RULES_DEBUG
 140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 141 char *snd_pcm_hw_param_names[] = {
 142         HW_PARAM(ACCESS),
 143         HW_PARAM(FORMAT),
 144         HW_PARAM(SUBFORMAT),
 145         HW_PARAM(SAMPLE_BITS),
 146         HW_PARAM(FRAME_BITS),
 147         HW_PARAM(CHANNELS),
 148         HW_PARAM(RATE),
 149         HW_PARAM(PERIOD_TIME),
 150         HW_PARAM(PERIOD_SIZE),
 151         HW_PARAM(PERIOD_BYTES),
 152         HW_PARAM(PERIODS),
 153         HW_PARAM(BUFFER_TIME),
 154         HW_PARAM(BUFFER_SIZE),
 155         HW_PARAM(BUFFER_BYTES),
 156         HW_PARAM(TICK_TIME),
 157 };
 158 #endif
 159
 160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 161                       struct snd_pcm_hw_params *params)
 162 {
 163         unsigned int k;
 164         struct snd_pcm_hardware *hw;
 165         struct snd_interval *i = NULL;
 166         struct snd_mask *m = NULL;
 167         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 168         unsigned int rstamps[constrs->rules_num];
 169         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 170         unsigned int stamp = 2;
 171         int changed, again;
 172
 173         params->info = 0;
 174         params->fifo_size = 0;
 175         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 176                 params->msbits = 0;
 177         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 178                 params->rate_num = 0;
 179                 params->rate_den = 0;
 180         }
 181
 182         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 183                 m = hw_param_mask(params, k);
 184                 if (snd_mask_empty(m))
 185                         return -EINVAL;
 186                 if (!(params->rmask & (1 << k)))
 187                         continue;
 188 #ifdef RULES_DEBUG
 189                 printk("%s = ", snd_pcm_hw_param_names[k]);
 190                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 191 #endif
 192                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 193 #ifdef RULES_DEBUG
 194                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 195 #endif
 196                 if (changed)
 197                         params->cmask |= 1 << k;
 198                 if (changed < 0)
 199                         return changed;
 200         }
 201
 202         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 203                 i = hw_param_interval(params, k);
 204                 if (snd_interval_empty(i))
 205                         return -EINVAL;
 206                 if (!(params->rmask & (1 << k)))
 207                         continue;
 208 #ifdef RULES_DEBUG
 209                 printk("%s = ", snd_pcm_hw_param_names[k]);
 210                 if (i->empty)
 211                         printk("empty");
 212                 else
 213                         printk("%c%u %u%c",
 214                                i->openmin ? '(' : '[', i->min,
 215                                i->max, i->openmax ? ')' : ']');
 216                 printk(" -> ");
 217 #endif
 218                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 219 #ifdef RULES_DEBUG
 220                 if (i->empty)
 221                         printk("empty\n");
 222                 else
 223                         printk("%c%u %u%c\n",
 224                                i->openmin ? '(' : '[', i->min,
 225                                i->max, i->openmax ? ')' : ']');
 226 #endif
 227                 if (changed)
 228                         params->cmask |= 1 << k;
 229                 if (changed < 0)
 230                         return changed;
 231         }
 232
 233         for (k = 0; k < constrs->rules_num; k++)
 234                 rstamps[k] = 0;
 235         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 236                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 237         do {
 238                 again = 0;
 239                 for (k = 0; k < constrs->rules_num; k++) {
 240                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 241                         unsigned int d;
 242                         int doit = 0;
 243                         if (r->cond && !(r->cond & params->flags))
 244                                 continue;
 245                         for (d = 0; r->deps[d] >= 0; d++) {
 246                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 247                                         doit = 1;
 248                                         break;
 249                                 }
 250                         }
 251                         if (!doit)
 252                                 continue;
 253 #ifdef RULES_DEBUG
 254                         printk("Rule %d [%p]: ", k, r->func);
 255                         if (r->var >= 0) {
 256                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 257                                 if (hw_is_mask(r->var)) {
 258                                         m = hw_param_mask(params, r->var);
 259                                         printk("%x", *m->bits);
 260                                 } else {
 261                                         i = hw_param_interval(params, r->var);
 262                                         if (i->empty)
 263                                                 printk("empty");
 264                                         else
 265                                                 printk("%c%u %u%c",
 266                                                        i->openmin ? '(' : '[', i->min,
 267                                                        i->max, i->openmax ? ')' : ']');
 268                                 }
 269                         }
 270 #endif
 271                         changed = r->func(params, r);
 272 #ifdef RULES_DEBUG
 273                         if (r->var >= 0) {
 274                                 printk(" -> ");
 275                                 if (hw_is_mask(r->var))
 276                                         printk("%x", *m->bits);
 277                                 else {
 278                                         if (i->empty)
 279                                                 printk("empty");
 280                                         else
 281                                                 printk("%c%u %u%c",
 282                                                        i->openmin ? '(' : '[', i->min,
 283                                                        i->max, i->openmax ? ')' : ']');
 284                                 }
 285                         }
 286                         printk("\n");
 287 #endif
 288                         rstamps[k] = stamp;
 289                         if (changed && r->var >= 0) {
 290                                 params->cmask |= (1 << r->var);
 291                                 vstamps[r->var] = stamp;
 292                                 again = 1;
 293                         }
 294                         if (changed < 0)
 295                                 return changed;
 296                         stamp++;
 297                 }
 298         } while (again);
 299         if (!params->msbits) {
 300                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 301                 if (snd_interval_single(i))
 302                         params->msbits = snd_interval_value(i);
 303         }
 304
 305         if (!params->rate_den) {
 306                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 307                 if (snd_interval_single(i)) {
 308                         params->rate_num = snd_interval_value(i);
 309                         params->rate_den = 1;
 310                 }
 311         }
 312
 313         hw = &substream->runtime->hw;
 314         if (!params->info)
 315                 params->info = hw->info;
 316         if (!params->fifo_size)
 317                 params->fifo_size = hw->fifo_size;
 318         params->rmask = 0;
 319         return 0;
 320 }
 321
 322 EXPORT_SYMBOL(snd_pcm_hw_refine);
 323
 324 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 325                                   struct snd_pcm_hw_params __user * _params)
 326 {
 327         struct snd_pcm_hw_params *params;
 328         int err;
 329
 330         params = kmalloc(sizeof(*params), GFP_KERNEL);
 331         if (!params) {
 332                 err = -ENOMEM;
 333                 goto out;
 334         }
 335         if (copy_from_user(params, _params, sizeof(*params))) {
 336                 err = -EFAULT;
 337                 goto out;
 338         }
 339         err = snd_pcm_hw_refine(substream, params);
 340         if (copy_to_user(_params, params, sizeof(*params))) {
 341                 if (!err)
 342                         err = -EFAULT;
 343         }
 344 out:
 345         kfree(params);
 346         return err;
 347 }
 348
 349 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 350 {
 351         int usecs;
 352
 353         if (! runtime->rate)
 354                 return -1; /* invalid */
 355
 356         /* take 75% of period time as the deadline */
 357         usecs = (750000 / runtime->rate) * runtime->period_size;
 358         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 359                 runtime->rate;
 360
 361         return usecs;
 362 }
 363
 364 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 365                              struct snd_pcm_hw_params *params)
 366 {
 367         struct snd_pcm_runtime *runtime;
 368         int err, usecs;
 369         unsigned int bits;
 370         snd_pcm_uframes_t frames;
 371
 372         snd_assert(substream != NULL, return -ENXIO);
 373         runtime = substream->runtime;
 374         snd_assert(runtime != NULL, return -ENXIO);
 375         snd_pcm_stream_lock_irq(substream);
 376         switch (runtime->status->state) {
 377         case SNDRV_PCM_STATE_OPEN:
 378         case SNDRV_PCM_STATE_SETUP:
 379         case SNDRV_PCM_STATE_PREPARED:
 380                 break;
 381         default:
 382                 snd_pcm_stream_unlock_irq(substream);
 383                 return -EBADFD;
 384         }
 385         snd_pcm_stream_unlock_irq(substream);
 386 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 387         if (!substream->oss.oss)
 388 #endif
 389                 if (atomic_read(&substream->mmap_count))
 390                         return -EBADFD;
 391
 392         params->rmask = ~0U;
 393         err = snd_pcm_hw_refine(substream, params);
 394         if (err < 0)
 395                 goto _error;
 396
 397         err = snd_pcm_hw_params_choose(substream, params);
 398         if (err < 0)
 399                 goto _error;
 400
 401         if (substream->ops->hw_params != NULL) {
 402                 err = substream->ops->hw_params(substream, params);
 403                 if (err < 0)
 404                         goto _error;
 405         }
 406
 407         runtime->access = params_access(params);
 408         runtime->format = params_format(params);
 409         runtime->subformat = params_subformat(params);
 410         runtime->channels = params_channels(params);
 411         runtime->rate = params_rate(params);
 412         runtime->period_size = params_period_size(params);
 413         runtime->periods = params_periods(params);
 414         runtime->buffer_size = params_buffer_size(params);
 415         runtime->info = params->info;
 416         runtime->rate_num = params->rate_num;
 417         runtime->rate_den = params->rate_den;
 418
 419         bits = snd_pcm_format_physical_width(runtime->format);
 420         runtime->sample_bits = bits;
 421         bits *= runtime->channels;
 422         runtime->frame_bits = bits;
 423         frames = 1;
 424         while (bits % 8 != 0) {
 425                 bits *= 2;
 426                 frames *= 2;
 427         }
 428         runtime->byte_align = bits / 8;
 429         runtime->min_align = frames;
 430
 431         /* Default sw params */
 432         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 433         runtime->period_step = 1;
 434         runtime->control->avail_min = runtime->period_size;
 435         runtime->start_threshold = 1;
 436         runtime->stop_threshold = runtime->buffer_size;
 437         runtime->silence_threshold = 0;
 438         runtime->silence_size = 0;
 439         runtime->boundary = runtime->buffer_size;
 440         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 441                 runtime->boundary *= 2;
 442
 443         snd_pcm_timer_resolution_change(substream);
 444         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 445
 446         remove_acceptable_latency(substream->latency_id);
 447         if ((usecs = period_to_usecs(runtime)) >= 0)
 448                 set_acceptable_latency(substream->latency_id, usecs);
 449         return 0;
 450  _error:
 451         /* hardware might be unuseable from this time,
 452            so we force application to retry to set
 453            the correct hardware parameter settings */
 454         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 455         if (substream->ops->hw_free != NULL)
 456                 substream->ops->hw_free(substream);
 457         return err;
 458 }
 459
 460 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 461                                   struct snd_pcm_hw_params __user * _params)
 462 {
 463         struct snd_pcm_hw_params *params;
 464         int err;
 465
 466         params = kmalloc(sizeof(*params), GFP_KERNEL);
 467         if (!params) {
 468                 err = -ENOMEM;
 469                 goto out;
 470         }
 471         if (copy_from_user(params, _params, sizeof(*params))) {
 472                 err = -EFAULT;
 473                 goto out;
 474         }
 475         err = snd_pcm_hw_params(substream, params);
 476         if (copy_to_user(_params, params, sizeof(*params))) {
 477                 if (!err)
 478                         err = -EFAULT;
 479         }
 480 out:
 481         kfree(params);
 482         return err;
 483 }
 484
 485 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 486 {
 487         struct snd_pcm_runtime *runtime;
 488         int result = 0;
 489
 490         snd_assert(substream != NULL, return -ENXIO);
 491         runtime = substream->runtime;
 492         snd_assert(runtime != NULL, return -ENXIO);
 493         snd_pcm_stream_lock_irq(substream);
 494         switch (runtime->status->state) {
 495         case SNDRV_PCM_STATE_SETUP:
 496         case SNDRV_PCM_STATE_PREPARED:
 497                 break;
 498         default:
 499                 snd_pcm_stream_unlock_irq(substream);
 500                 return -EBADFD;
 501         }
 502         snd_pcm_stream_unlock_irq(substream);
 503         if (atomic_read(&substream->mmap_count))
 504                 return -EBADFD;
 505         if (substream->ops->hw_free)
 506                 result = substream->ops->hw_free(substream);
 507         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 508         remove_acceptable_latency(substream->latency_id);
 509         return result;
 510 }
 511
 512 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 513                              struct snd_pcm_sw_params *params)
 514 {
 515         struct snd_pcm_runtime *runtime;
 516
 517         snd_assert(substream != NULL, return -ENXIO);
 518         runtime = substream->runtime;
 519         snd_assert(runtime != NULL, return -ENXIO);
 520         snd_pcm_stream_lock_irq(substream);
 521         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 522                 snd_pcm_stream_unlock_irq(substream);
 523                 return -EBADFD;
 524         }
 525         snd_pcm_stream_unlock_irq(substream);
 526
 527         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 528                 return -EINVAL;
 529         if (params->avail_min == 0)
 530                 return -EINVAL;
 531         if (params->silence_size >= runtime->boundary) {
 532                 if (params->silence_threshold != 0)
 533                         return -EINVAL;
 534         } else {
 535                 if (params->silence_size > params->silence_threshold)
 536                         return -EINVAL;
 537                 if (params->silence_threshold > runtime->buffer_size)
 538                         return -EINVAL;
 539         }
 540         snd_pcm_stream_lock_irq(substream);
 541         runtime->tstamp_mode = params->tstamp_mode;
 542         runtime->period_step = params->period_step;
 543         runtime->control->avail_min = params->avail_min;
 544         runtime->start_threshold = params->start_threshold;
 545         runtime->stop_threshold = params->stop_threshold;
 546         runtime->silence_threshold = params->silence_threshold;
 547         runtime->silence_size = params->silence_size;
 548         params->boundary = runtime->boundary;
 549         if (snd_pcm_running(substream)) {
 550                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 551                     runtime->silence_size > 0)
 552                         snd_pcm_playback_silence(substream, ULONG_MAX);
 553                 wake_up(&runtime->sleep);
 554         }
 555         snd_pcm_stream_unlock_irq(substream);
 556         return 0;
 557 }
 558
 559 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 560                                   struct snd_pcm_sw_params __user * _params)
 561 {
 562         struct snd_pcm_sw_params params;
 563         int err;
 564         if (copy_from_user(&params, _params, sizeof(params)))
 565                 return -EFAULT;
 566         err = snd_pcm_sw_params(substream, &params);
 567         if (copy_to_user(_params, &params, sizeof(params)))
 568                 return -EFAULT;
 569         return err;
 570 }
 571
 572 int snd_pcm_status(struct snd_pcm_substream *substream,
 573                    struct snd_pcm_status *status)
 574 {
 575         struct snd_pcm_runtime *runtime = substream->runtime;
 576
 577         snd_pcm_stream_lock_irq(substream);
 578         status->state = runtime->status->state;
 579         status->suspended_state = runtime->status->suspended_state;
 580         if (status->state == SNDRV_PCM_STATE_OPEN)
 581                 goto _end;
 582         status->trigger_tstamp = runtime->trigger_tstamp;
 583         if (snd_pcm_running(substream)) {
 584                 snd_pcm_update_hw_ptr(substream);
 585                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 586                         status->tstamp = runtime->status->tstamp;
 587                         goto _tstamp_end;
 588                 }
 589         }
 590         snd_pcm_gettime(runtime, &status->tstamp);
 591  _tstamp_end:
 592         status->appl_ptr = runtime->control->appl_ptr;
 593         status->hw_ptr = runtime->status->hw_ptr;
 594         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 595                 status->avail = snd_pcm_playback_avail(runtime);
 596                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 597                     runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 598                         status->delay = runtime->buffer_size - status->avail;
 599                 else
 600                         status->delay = 0;
 601         } else {
 602                 status->avail = snd_pcm_capture_avail(runtime);
 603                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 604                         status->delay = status->avail;
 605                 else
 606                         status->delay = 0;
 607         }
 608         status->avail_max = runtime->avail_max;
 609         status->overrange = runtime->overrange;
 610         runtime->avail_max = 0;
 611         runtime->overrange = 0;
 612  _end:
 613         snd_pcm_stream_unlock_irq(substream);
 614         return 0;
 615 }
 616
 617 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 618                                struct snd_pcm_status __user * _status)
 619 {
 620         struct snd_pcm_status status;
 621         struct snd_pcm_runtime *runtime;
 622         int res;
 623
 624         snd_assert(substream != NULL, return -ENXIO);
 625         runtime = substream->runtime;
 626         memset(&status, 0, sizeof(status));
 627         res = snd_pcm_status(substream, &status);
 628         if (res < 0)
 629                 return res;
 630         if (copy_to_user(_status, &status, sizeof(status)))
 631                 return -EFAULT;
 632         return 0;
 633 }
 634
 635 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 636                                 struct snd_pcm_channel_info * info)
 637 {
 638         struct snd_pcm_runtime *runtime;
 639         unsigned int channel;
 640
 641         snd_assert(substream != NULL, return -ENXIO);
 642         channel = info->channel;
 643         runtime = substream->runtime;
 644         snd_pcm_stream_lock_irq(substream);
 645         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 646                 snd_pcm_stream_unlock_irq(substream);
 647                 return -EBADFD;
 648         }
 649         snd_pcm_stream_unlock_irq(substream);
 650         if (channel >= runtime->channels)
 651                 return -EINVAL;
 652         memset(info, 0, sizeof(*info));
 653         info->channel = channel;
 654         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 655 }
 656
 657 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 658                                      struct snd_pcm_channel_info __user * _info)
 659 {
 660         struct snd_pcm_channel_info info;
 661         int res;
 662
 663         if (copy_from_user(&info, _info, sizeof(info)))
 664                 return -EFAULT;
 665         res = snd_pcm_channel_info(substream, &info);
 666         if (res < 0)
 667                 return res;
 668         if (copy_to_user(_info, &info, sizeof(info)))
 669                 return -EFAULT;
 670         return 0;
 671 }
 672
 673 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 674 {
 675         struct snd_pcm_runtime *runtime = substream->runtime;
 676         if (runtime->trigger_master == NULL)
 677                 return;
 678         if (runtime->trigger_master == substream) {
 679                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 680         } else {
 681                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 682                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 683         }
 684         runtime->trigger_master = NULL;
 685 }
 686
 687 struct action_ops {
 688         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 689         int (*do_action)(struct snd_pcm_substream *substream, int state);
 690         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 691         void (*post_action)(struct snd_pcm_substream *substream, int state);
 692 };
 693
 694 /*
 695  *  this functions is core for handling of linked stream
 696  *  Note: the stream state might be changed also on failure
 697  *  Note2: call with calling stream lock + link lock
 698  */
 699 static int snd_pcm_action_group(struct action_ops *ops,
 700                                 struct snd_pcm_substream *substream,
 701                                 int state, int do_lock)
 702 {
 703         struct snd_pcm_substream *s = NULL;
 704         struct snd_pcm_substream *s1;
 705         int res = 0;
 706
 707         snd_pcm_group_for_each_entry(s, substream) {
 708                 if (do_lock && s != substream)
 709                         spin_lock_nested(&s->self_group.lock,
 710                                          SINGLE_DEPTH_NESTING);
 711                 res = ops->pre_action(s, state);
 712                 if (res < 0)
 713                         goto _unlock;
 714         }
 715         snd_pcm_group_for_each_entry(s, substream) {
 716                 res = ops->do_action(s, state);
 717                 if (res < 0) {
 718                         if (ops->undo_action) {
 719                                 snd_pcm_group_for_each_entry(s1, substream) {
 720                                         if (s1 == s) /* failed stream */
 721                                                 break;
 722                                         ops->undo_action(s1, state);
 723                                 }
 724                         }
 725                         s = NULL; /* unlock all */
 726                         goto _unlock;
 727                 }
 728         }
 729         snd_pcm_group_for_each_entry(s, substream) {
 730                 ops->post_action(s, state);
 731         }
 732  _unlock:
 733         if (do_lock) {
 734                 /* unlock streams */
 735                 snd_pcm_group_for_each_entry(s1, substream) {
 736                         if (s1 != substream)
 737                                 spin_unlock(&s1->self_group.lock);
 738                         if (s1 == s)    /* end */
 739                                 break;
 740                 }
 741         }
 742         return res;
 743 }
 744
 745 /*
 746  *  Note: call with stream lock
 747  */
 748 static int snd_pcm_action_single(struct action_ops *ops,
 749                                  struct snd_pcm_substream *substream,
 750                                  int state)
 751 {
 752         int res;
 753
 754         res = ops->pre_action(substream, state);
 755         if (res < 0)
 756                 return res;
 757         res = ops->do_action(substream, state);
 758         if (res == 0)
 759                 ops->post_action(substream, state);
 760         else if (ops->undo_action)
 761                 ops->undo_action(substream, state);
 762         return res;
 763 }
 764
 765 /*
 766  *  Note: call with stream lock
 767  */
 768 static int snd_pcm_action(struct action_ops *ops,
 769                           struct snd_pcm_substream *substream,
 770                           int state)
 771 {
 772         int res;
 773
 774         if (snd_pcm_stream_linked(substream)) {
 775                 if (!spin_trylock(&substream->group->lock)) {
 776                         spin_unlock(&substream->self_group.lock);
 777                         spin_lock(&substream->group->lock);
 778                         spin_lock(&substream->self_group.lock);
 779                 }
 780                 res = snd_pcm_action_group(ops, substream, state, 1);
 781                 spin_unlock(&substream->group->lock);
 782         } else {
 783                 res = snd_pcm_action_single(ops, substream, state);
 784         }
 785         return res;
 786 }
 787
 788 /*
 789  *  Note: don't use any locks before
 790  */
 791 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 792                                    struct snd_pcm_substream *substream,
 793                                    int state)
 794 {
 795         int res;
 796
 797         read_lock_irq(&snd_pcm_link_rwlock);
 798         if (snd_pcm_stream_linked(substream)) {
 799                 spin_lock(&substream->group->lock);
 800                 spin_lock(&substream->self_group.lock);
 801                 res = snd_pcm_action_group(ops, substream, state, 1);
 802                 spin_unlock(&substream->self_group.lock);
 803                 spin_unlock(&substream->group->lock);
 804         } else {
 805                 spin_lock(&substream->self_group.lock);
 806                 res = snd_pcm_action_single(ops, substream, state);
 807                 spin_unlock(&substream->self_group.lock);
 808         }
 809         read_unlock_irq(&snd_pcm_link_rwlock);
 810         return res;
 811 }
 812
 813 /*
 814  */
 815 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 816                                     struct snd_pcm_substream *substream,
 817                                     int state)
 818 {
 819         int res;
 820
 821         down_read(&snd_pcm_link_rwsem);
 822         if (snd_pcm_stream_linked(substream))
 823                 res = snd_pcm_action_group(ops, substream, state, 0);
 824         else
 825                 res = snd_pcm_action_single(ops, substream, state);
 826         up_read(&snd_pcm_link_rwsem);
 827         return res;
 828 }
 829
 830 /*
 831  * start callbacks
 832  */
 833 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 834 {
 835         struct snd_pcm_runtime *runtime = substream->runtime;
 836         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 837                 return -EBADFD;
 838         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 839             !snd_pcm_playback_data(substream))
 840                 return -EPIPE;
 841         runtime->trigger_master = substream;
 842         return 0;
 843 }
 844
 845 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 846 {
 847         if (substream->runtime->trigger_master != substream)
 848                 return 0;
 849         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 850 }
 851
 852 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 853 {
 854         if (substream->runtime->trigger_master == substream)
 855                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 856 }
 857
 858 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 859 {
 860         struct snd_pcm_runtime *runtime = substream->runtime;
 861         snd_pcm_trigger_tstamp(substream);
 862         runtime->status->state = state;
 863         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 864             runtime->silence_size > 0)
 865                 snd_pcm_playback_silence(substream, ULONG_MAX);
 866         if (substream->timer)
 867                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 868                                  &runtime->trigger_tstamp);
 869 }
 870
 871 static struct action_ops snd_pcm_action_start = {
 872         .pre_action = snd_pcm_pre_start,
 873         .do_action = snd_pcm_do_start,
 874         .undo_action = snd_pcm_undo_start,
 875         .post_action = snd_pcm_post_start
 876 };
 877
 878 /**
 879  * snd_pcm_start
 880  * @substream: the PCM substream instance
 881  *
 882  * Start all linked streams.
 883  */
 884 int snd_pcm_start(struct snd_pcm_substream *substream)
 885 {
 886         return snd_pcm_action(&snd_pcm_action_start, substream,
 887                               SNDRV_PCM_STATE_RUNNING);
 888 }
 889
 890 /*
 891  * stop callbacks
 892  */
 893 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 894 {
 895         struct snd_pcm_runtime *runtime = substream->runtime;
 896         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 897                 return -EBADFD;
 898         runtime->trigger_master = substream;
 899         return 0;
 900 }
 901
 902 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 903 {
 904         if (substream->runtime->trigger_master == substream &&
 905             snd_pcm_running(substream))
 906                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 907         return 0; /* unconditonally stop all substreams */
 908 }
 909
 910 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 911 {
 912         struct snd_pcm_runtime *runtime = substream->runtime;
 913         if (runtime->status->state != state) {
 914                 snd_pcm_trigger_tstamp(substream);
 915                 if (substream->timer)
 916                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 917                                          &runtime->trigger_tstamp);
 918                 runtime->status->state = state;
 919         }
 920         wake_up(&runtime->sleep);
 921 }
 922
 923 static struct action_ops snd_pcm_action_stop = {
 924         .pre_action = snd_pcm_pre_stop,
 925         .do_action = snd_pcm_do_stop,
 926         .post_action = snd_pcm_post_stop
 927 };
 928
 929 /**
 930  * snd_pcm_stop
 931  * @substream: the PCM substream instance
 932  * @state: PCM state after stopping the stream
 933  *
 934  * Try to stop all running streams in the substream group.
 935  * The state of each stream is changed to the given value after that unconditionally.
 936  */
 937 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 938 {
 939         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 940 }
 941
 942 EXPORT_SYMBOL(snd_pcm_stop);
 943
 944 /**
 945  * snd_pcm_drain_done
 946  * @substream: the PCM substream
 947  *
 948  * Stop the DMA only when the given stream is playback.
 949  * The state is changed to SETUP.
 950  * Unlike snd_pcm_stop(), this affects only the given stream.
 951  */
 952 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 953 {
 954         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 955                                      SNDRV_PCM_STATE_SETUP);
 956 }
 957
 958 /*
 959  * pause callbacks
 960  */
 961 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 962 {
 963         struct snd_pcm_runtime *runtime = substream->runtime;
 964         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 965                 return -ENOSYS;
 966         if (push) {
 967                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
 968                         return -EBADFD;
 969         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
 970                 return -EBADFD;
 971         runtime->trigger_master = substream;
 972         return 0;
 973 }
 974
 975 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
 976 {
 977         if (substream->runtime->trigger_master != substream)
 978                 return 0;
 979         return substream->ops->trigger(substream,
 980                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
 981                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
 982 }
 983
 984 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
 985 {
 986         if (substream->runtime->trigger_master == substream)
 987                 substream->ops->trigger(substream,
 988                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
 989                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
 990 }
 991
 992 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
 993 {
 994         struct snd_pcm_runtime *runtime = substream->runtime;
 995         snd_pcm_trigger_tstamp(substream);
 996         if (push) {
 997                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
 998                 if (substream->timer)
 999                         snd_timer_notify(substream->timer,
1000                                          SNDRV_TIMER_EVENT_MPAUSE,
1001                                          &runtime->trigger_tstamp);
1002                 wake_up(&runtime->sleep);
1003         } else {
1004                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1005                 if (substream->timer)
1006                         snd_timer_notify(substream->timer,
1007                                          SNDRV_TIMER_EVENT_MCONTINUE,
1008                                          &runtime->trigger_tstamp);
1009         }
1010 }
1011
1012 static struct action_ops snd_pcm_action_pause = {
1013         .pre_action = snd_pcm_pre_pause,
1014         .do_action = snd_pcm_do_pause,
1015         .undo_action = snd_pcm_undo_pause,
1016         .post_action = snd_pcm_post_pause
1017 };
1018
1019 /*
1020  * Push/release the pause for all linked streams.
1021  */
1022 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1023 {
1024         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1025 }
1026
1027 #ifdef CONFIG_PM
1028 /* suspend */
1029
1030 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1031 {
1032         struct snd_pcm_runtime *runtime = substream->runtime;
1033         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1034                 return -EBUSY;
1035         runtime->trigger_master = substream;
1036         return 0;
1037 }
1038
1039 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1040 {
1041         struct snd_pcm_runtime *runtime = substream->runtime;
1042         if (runtime->trigger_master != substream)
1043                 return 0;
1044         if (! snd_pcm_running(substream))
1045                 return 0;
1046         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1047         return 0; /* suspend unconditionally */
1048 }
1049
1050 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1051 {
1052         struct snd_pcm_runtime *runtime = substream->runtime;
1053         snd_pcm_trigger_tstamp(substream);
1054         if (substream->timer)
1055                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1056                                  &runtime->trigger_tstamp);
1057         runtime->status->suspended_state = runtime->status->state;
1058         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1059         wake_up(&runtime->sleep);
1060 }
1061
1062 static struct action_ops snd_pcm_action_suspend = {
1063         .pre_action = snd_pcm_pre_suspend,
1064         .do_action = snd_pcm_do_suspend,
1065         .post_action = snd_pcm_post_suspend
1066 };
1067
1068 /**
1069  * snd_pcm_suspend
1070  * @substream: the PCM substream
1071  *
1072  * Trigger SUSPEND to all linked streams.
1073  * After this call, all streams are changed to SUSPENDED state.
1074  */
1075 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1076 {
1077         int err;
1078         unsigned long flags;
1079
1080         if (! substream)
1081                 return 0;
1082
1083         snd_pcm_stream_lock_irqsave(substream, flags);
1084         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1085         snd_pcm_stream_unlock_irqrestore(substream, flags);
1086         return err;
1087 }
1088
1089 EXPORT_SYMBOL(snd_pcm_suspend);
1090
1091 /**
1092  * snd_pcm_suspend_all
1093  * @pcm: the PCM instance
1094  *
1095  * Trigger SUSPEND to all substreams in the given pcm.
1096  * After this call, all streams are changed to SUSPENDED state.
1097  */
1098 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1099 {
1100         struct snd_pcm_substream *substream;
1101         int stream, err = 0;
1102
1103         if (! pcm)
1104                 return 0;
1105
1106         for (stream = 0; stream < 2; stream++) {
1107                 for (substream = pcm->streams[stream].substream;
1108                      substream; substream = substream->next) {
1109                         /* FIXME: the open/close code should lock this as well */
1110                         if (substream->runtime == NULL)
1111                                 continue;
1112                         err = snd_pcm_suspend(substream);
1113                         if (err < 0 && err != -EBUSY)
1114                                 return err;
1115                 }
1116         }
1117         return 0;
1118 }
1119
1120 EXPORT_SYMBOL(snd_pcm_suspend_all);
1121
1122 /* resume */
1123
1124 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1125 {
1126         struct snd_pcm_runtime *runtime = substream->runtime;
1127         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1128                 return -ENOSYS;
1129         runtime->trigger_master = substream;
1130         return 0;
1131 }
1132
1133 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1134 {
1135         struct snd_pcm_runtime *runtime = substream->runtime;
1136         if (runtime->trigger_master != substream)
1137                 return 0;
1138         /* DMA not running previously? */
1139         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1140             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1141              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1142                 return 0;
1143         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1144 }
1145
1146 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1147 {
1148         if (substream->runtime->trigger_master == substream &&
1149             snd_pcm_running(substream))
1150                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1151 }
1152
1153 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1154 {
1155         struct snd_pcm_runtime *runtime = substream->runtime;
1156         snd_pcm_trigger_tstamp(substream);
1157         if (substream->timer)
1158                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1159                                  &runtime->trigger_tstamp);
1160         runtime->status->state = runtime->status->suspended_state;
1161 }
1162
1163 static struct action_ops snd_pcm_action_resume = {
1164         .pre_action = snd_pcm_pre_resume,
1165         .do_action = snd_pcm_do_resume,
1166         .undo_action = snd_pcm_undo_resume,
1167         .post_action = snd_pcm_post_resume
1168 };
1169
1170 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1171 {
1172         struct snd_card *card = substream->pcm->card;
1173         int res;
1174
1175         snd_power_lock(card);
1176         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1177                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1178         snd_power_unlock(card);
1179         return res;
1180 }
1181
1182 #else
1183
1184 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1185 {
1186         return -ENOSYS;
1187 }
1188
1189 #endif /* CONFIG_PM */
1190
1191 /*
1192  * xrun ioctl
1193  *
1194  * Change the RUNNING stream(s) to XRUN state.
1195  */
1196 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1197 {
1198         struct snd_card *card = substream->pcm->card;
1199         struct snd_pcm_runtime *runtime = substream->runtime;
1200         int result;
1201
1202         snd_power_lock(card);
1203         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1204                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1205                 if (result < 0)
1206                         goto _unlock;
1207         }
1208
1209         snd_pcm_stream_lock_irq(substream);
1210         switch (runtime->status->state) {
1211         case SNDRV_PCM_STATE_XRUN:
1212                 result = 0;     /* already there */
1213                 break;
1214         case SNDRV_PCM_STATE_RUNNING:
1215                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1216                 break;
1217         default:
1218                 result = -EBADFD;
1219         }
1220         snd_pcm_stream_unlock_irq(substream);
1221  _unlock:
1222         snd_power_unlock(card);
1223         return result;
1224 }
1225
1226 /*
1227  * reset ioctl
1228  */
1229 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1230 {
1231         struct snd_pcm_runtime *runtime = substream->runtime;
1232         switch (runtime->status->state) {
1233         case SNDRV_PCM_STATE_RUNNING:
1234         case SNDRV_PCM_STATE_PREPARED:
1235         case SNDRV_PCM_STATE_PAUSED:
1236         case SNDRV_PCM_STATE_SUSPENDED:
1237                 return 0;
1238         default:
1239                 return -EBADFD;
1240         }
1241 }
1242
1243 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1244 {
1245         struct snd_pcm_runtime *runtime = substream->runtime;
1246         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1247         if (err < 0)
1248                 return err;
1249         // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, );
1250         runtime->hw_ptr_base = 0;
1251         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1252                 runtime->status->hw_ptr % runtime->period_size;
1253         runtime->silence_start = runtime->status->hw_ptr;
1254         runtime->silence_filled = 0;
1255         return 0;
1256 }
1257
1258 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1259 {
1260         struct snd_pcm_runtime *runtime = substream->runtime;
1261         runtime->control->appl_ptr = runtime->status->hw_ptr;
1262         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1263             runtime->silence_size > 0)
1264                 snd_pcm_playback_silence(substream, ULONG_MAX);
1265 }
1266
1267 static struct action_ops snd_pcm_action_reset = {
1268         .pre_action = snd_pcm_pre_reset,
1269         .do_action = snd_pcm_do_reset,
1270         .post_action = snd_pcm_post_reset
1271 };
1272
1273 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1274 {
1275         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1276 }
1277
1278 /*
1279  * prepare ioctl
1280  */
1281 /* we use the second argument for updating f_flags */
1282 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1283                                int f_flags)
1284 {
1285         struct snd_pcm_runtime *runtime = substream->runtime;
1286         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1287             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1288                 return -EBADFD;
1289         if (snd_pcm_running(substream))
1290                 return -EBUSY;
1291         substream->f_flags = f_flags;
1292         return 0;
1293 }
1294
1295 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1296 {
1297         int err;
1298         err = substream->ops->prepare(substream);
1299         if (err < 0)
1300                 return err;
1301         return snd_pcm_do_reset(substream, 0);
1302 }
1303
1304 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1305 {
1306         struct snd_pcm_runtime *runtime = substream->runtime;
1307         runtime->control->appl_ptr = runtime->status->hw_ptr;
1308         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1309 }
1310
1311 static struct action_ops snd_pcm_action_prepare = {
1312         .pre_action = snd_pcm_pre_prepare,
1313         .do_action = snd_pcm_do_prepare,
1314         .post_action = snd_pcm_post_prepare
1315 };
1316
1317 /**
1318  * snd_pcm_prepare
1319  * @substream: the PCM substream instance
1320  * @file: file to refer f_flags
1321  *
1322  * Prepare the PCM substream to be triggerable.
1323  */
1324 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1325                            struct file *file)
1326 {
1327         int res;
1328         struct snd_card *card = substream->pcm->card;
1329         int f_flags;
1330
1331         if (file)
1332                 f_flags = file->f_flags;
1333         else
1334                 f_flags = substream->f_flags;
1335
1336         snd_power_lock(card);
1337         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1338                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1339                                                substream, f_flags);
1340         snd_power_unlock(card);
1341         return res;
1342 }
1343
1344 /*
1345  * drain ioctl
1346  */
1347
1348 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1349 {
1350         if (substream->f_flags & O_NONBLOCK)
1351                 return -EAGAIN;
1352         substream->runtime->trigger_master = substream;
1353         return 0;
1354 }
1355
1356 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1357 {
1358         struct snd_pcm_runtime *runtime = substream->runtime;
1359         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1360                 switch (runtime->status->state) {
1361                 case SNDRV_PCM_STATE_PREPARED:
1362                         /* start playback stream if possible */
1363                         if (! snd_pcm_playback_empty(substream)) {
1364                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1365                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1366                         }
1367                         break;
1368                 case SNDRV_PCM_STATE_RUNNING:
1369                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1370                         break;
1371                 default:
1372                         break;
1373                 }
1374         } else {
1375                 /* stop running stream */
1376                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1377                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1378                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1379                         snd_pcm_do_stop(substream, new_state);
1380                         snd_pcm_post_stop(substream, new_state);
1381                 }
1382         }
1383         return 0;
1384 }
1385
1386 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1387 {
1388 }
1389
1390 static struct action_ops snd_pcm_action_drain_init = {
1391         .pre_action = snd_pcm_pre_drain_init,
1392         .do_action = snd_pcm_do_drain_init,
1393         .post_action = snd_pcm_post_drain_init
1394 };
1395
1396 struct drain_rec {
1397         struct snd_pcm_substream *substream;
1398         wait_queue_t wait;
1399         snd_pcm_uframes_t stop_threshold;
1400 };
1401
1402 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1403
1404 /*
1405  * Drain the stream(s).
1406  * When the substream is linked, sync until the draining of all playback streams
1407  * is finished.
1408  * After this call, all streams are supposed to be either SETUP or DRAINING
1409  * (capture only) state.
1410  */
1411 static int snd_pcm_drain(struct snd_pcm_substream *substream)
1412 {
1413         struct snd_card *card;
1414         struct snd_pcm_runtime *runtime;
1415         struct snd_pcm_substream *s;
1416         int result = 0;
1417         int i, num_drecs;
1418         struct drain_rec *drec, drec_tmp, *d;
1419
1420         snd_assert(substream != NULL, return -ENXIO);
1421         card = substream->pcm->card;
1422         runtime = substream->runtime;
1423
1424         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1425                 return -EBADFD;
1426
1427         snd_power_lock(card);
1428         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1429                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1430                 if (result < 0) {
1431                         snd_power_unlock(card);
1432                         return result;
1433                 }
1434         }
1435
1436         /* allocate temporary record for drain sync */
1437         down_read(&snd_pcm_link_rwsem);
1438         if (snd_pcm_stream_linked(substream)) {
1439                 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL);
1440                 if (! drec) {
1441                         up_read(&snd_pcm_link_rwsem);
1442                         snd_power_unlock(card);
1443                         return -ENOMEM;
1444                 }
1445         } else
1446                 drec = &drec_tmp;
1447
1448         /* count only playback streams */
1449         num_drecs = 0;
1450         snd_pcm_group_for_each_entry(s, substream) {
1451                 runtime = s->runtime;
1452                 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1453                         d = &drec[num_drecs++];
1454                         d->substream = s;
1455                         init_waitqueue_entry(&d->wait, current);
1456                         add_wait_queue(&runtime->sleep, &d->wait);
1457                         /* stop_threshold fixup to avoid endless loop when
1458                          * stop_threshold > buffer_size
1459                          */
1460                         d->stop_threshold = runtime->stop_threshold;
1461                         if (runtime->stop_threshold > runtime->buffer_size)
1462                                 runtime->stop_threshold = runtime->buffer_size;
1463                 }
1464         }
1465         up_read(&snd_pcm_link_rwsem);
1466
1467         snd_pcm_stream_lock_irq(substream);
1468         /* resume pause */
1469         if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1470                 snd_pcm_pause(substream, 0);
1471
1472         /* pre-start/stop - all running streams are changed to DRAINING state */
1473         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1474         if (result < 0) {
1475                 snd_pcm_stream_unlock_irq(substream);
1476                 goto _error;
1477         }
1478
1479         for (;;) {
1480                 long tout;
1481                 if (signal_pending(current)) {
1482                         result = -ERESTARTSYS;
1483                         break;
1484                 }
1485                 /* all finished? */
1486                 for (i = 0; i < num_drecs; i++) {
1487                         runtime = drec[i].substream->runtime;
1488                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING)
1489                                 break;
1490                 }
1491                 if (i == num_drecs)
1492                         break; /* yes, all drained */
1493
1494                 set_current_state(TASK_INTERRUPTIBLE);
1495                 snd_pcm_stream_unlock_irq(substream);
1496                 snd_power_unlock(card);
1497                 tout = schedule_timeout(10 * HZ);
1498                 snd_power_lock(card);
1499                 snd_pcm_stream_lock_irq(substream);
1500                 if (tout == 0) {
1501                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1502                                 result = -ESTRPIPE;
1503                         else {
1504                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1505                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1506                                 result = -EIO;
1507                         }
1508                         break;
1509                 }
1510         }
1511
1512         snd_pcm_stream_unlock_irq(substream);
1513
1514  _error:
1515         for (i = 0; i < num_drecs; i++) {
1516                 d = &drec[i];
1517                 runtime = d->substream->runtime;
1518                 remove_wait_queue(&runtime->sleep, &d->wait);
1519                 runtime->stop_threshold = d->stop_threshold;
1520         }
1521
1522         if (drec != &drec_tmp)
1523                 kfree(drec);
1524         snd_power_unlock(card);
1525
1526         return result;
1527 }
1528
1529 /*
1530  * drop ioctl
1531  *
1532  * Immediately put all linked substreams into SETUP state.
1533  */
1534 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1535 {
1536         struct snd_pcm_runtime *runtime;
1537         struct snd_card *card;
1538         int result = 0;
1539
1540         snd_assert(substream != NULL, return -ENXIO);
1541         runtime = substream->runtime;
1542         card = substream->pcm->card;
1543
1544         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1545             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1546                 return -EBADFD;
1547
1548         snd_power_lock(card);
1549         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1550                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1551                 if (result < 0)
1552                         goto _unlock;
1553         }
1554
1555         snd_pcm_stream_lock_irq(substream);
1556         /* resume pause */
1557         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1558                 snd_pcm_pause(substream, 0);
1559
1560         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1561         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1562         snd_pcm_stream_unlock_irq(substream);
1563  _unlock:
1564         snd_power_unlock(card);
1565         return result;
1566 }
1567
1568
1569 /* WARNING: Don't forget to fput back the file */
1570 static struct file *snd_pcm_file_fd(int fd)
1571 {
1572         struct file *file;
1573         struct inode *inode;
1574         unsigned int minor;
1575
1576         file = fget(fd);
1577         if (!file)
1578                 return NULL;
1579         inode = file->f_path.dentry->d_inode;
1580         if (!S_ISCHR(inode->i_mode) ||
1581             imajor(inode) != snd_major) {
1582                 fput(file);
1583                 return NULL;
1584         }
1585         minor = iminor(inode);
1586         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1587             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1588                 fput(file);
1589                 return NULL;
1590         }
1591         return file;
1592 }
1593
1594 /*
1595  * PCM link handling
1596  */
1597 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1598 {
1599         int res = 0;
1600         struct file *file;
1601         struct snd_pcm_file *pcm_file;
1602         struct snd_pcm_substream *substream1;
1603
1604         file = snd_pcm_file_fd(fd);
1605         if (!file)
1606                 return -EBADFD;
1607         pcm_file = file->private_data;
1608         substream1 = pcm_file->substream;
1609         down_write(&snd_pcm_link_rwsem);
1610         write_lock_irq(&snd_pcm_link_rwlock);
1611         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1612             substream->runtime->status->state != substream1->runtime->status->state) {
1613                 res = -EBADFD;
1614                 goto _end;
1615         }
1616         if (snd_pcm_stream_linked(substream1)) {
1617                 res = -EALREADY;
1618                 goto _end;
1619         }
1620         if (!snd_pcm_stream_linked(substream)) {
1621                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1622                 if (substream->group == NULL) {
1623                         res = -ENOMEM;
1624                         goto _end;
1625                 }
1626                 spin_lock_init(&substream->group->lock);
1627                 INIT_LIST_HEAD(&substream->group->substreams);
1628                 list_add_tail(&substream->link_list, &substream->group->substreams);
1629                 substream->group->count = 1;
1630         }
1631         list_add_tail(&substream1->link_list, &substream->group->substreams);
1632         substream->group->count++;
1633         substream1->group = substream->group;
1634  _end:
1635         write_unlock_irq(&snd_pcm_link_rwlock);
1636         up_write(&snd_pcm_link_rwsem);
1637         fput(file);
1638         return res;
1639 }
1640
1641 static void relink_to_local(struct snd_pcm_substream *substream)
1642 {
1643         substream->group = &substream->self_group;
1644         INIT_LIST_HEAD(&substream->self_group.substreams);
1645         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1646 }
1647
1648 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1649 {
1650         struct snd_pcm_substream *s;
1651         int res = 0;
1652
1653         down_write(&snd_pcm_link_rwsem);
1654         write_lock_irq(&snd_pcm_link_rwlock);
1655         if (!snd_pcm_stream_linked(substream)) {
1656                 res = -EALREADY;
1657                 goto _end;
1658         }
1659         list_del(&substream->link_list);
1660         substream->group->count--;
1661         if (substream->group->count == 1) {     /* detach the last stream, too */
1662                 snd_pcm_group_for_each_entry(s, substream) {
1663                         relink_to_local(s);
1664                         break;
1665                 }
1666                 kfree(substream->group);
1667         }
1668         relink_to_local(substream);
1669        _end:
1670         write_unlock_irq(&snd_pcm_link_rwlock);
1671         up_write(&snd_pcm_link_rwsem);
1672         return res;
1673 }
1674
1675 /*
1676  * hw configurator
1677  */
1678 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1679                                struct snd_pcm_hw_rule *rule)
1680 {
1681         struct snd_interval t;
1682         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1683                      hw_param_interval_c(params, rule->deps[1]), &t);
1684         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1685 }
1686
1687 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1688                                struct snd_pcm_hw_rule *rule)
1689 {
1690         struct snd_interval t;
1691         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1692                      hw_param_interval_c(params, rule->deps[1]), &t);
1693         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1694 }
1695
1696 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1697                                    struct snd_pcm_hw_rule *rule)
1698 {
1699         struct snd_interval t;
1700         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1701                          hw_param_interval_c(params, rule->deps[1]),
1702                          (unsigned long) rule->private, &t);
1703         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1704 }
1705
1706 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1707                                    struct snd_pcm_hw_rule *rule)
1708 {
1709         struct snd_interval t;
1710         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1711                          (unsigned long) rule->private,
1712                          hw_param_interval_c(params, rule->deps[1]), &t);
1713         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1714 }
1715
1716 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1717                                   struct snd_pcm_hw_rule *rule)
1718 {
1719         unsigned int k;
1720         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1721         struct snd_mask m;
1722         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1723         snd_mask_any(&m);
1724         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1725                 int bits;
1726                 if (! snd_mask_test(mask, k))
1727                         continue;
1728                 bits = snd_pcm_format_physical_width(k);
1729                 if (bits <= 0)
1730                         continue; /* ignore invalid formats */
1731                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1732                         snd_mask_reset(&m, k);
1733         }
1734         return snd_mask_refine(mask, &m);
1735 }
1736
1737 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1738                                        struct snd_pcm_hw_rule *rule)
1739 {
1740         struct snd_interval t;
1741         unsigned int k;
1742         t.min = UINT_MAX;
1743         t.max = 0;
1744         t.openmin = 0;
1745         t.openmax = 0;
1746         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1747                 int bits;
1748                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1749                         continue;
1750                 bits = snd_pcm_format_physical_width(k);
1751                 if (bits <= 0)
1752                         continue; /* ignore invalid formats */
1753                 if (t.min > (unsigned)bits)
1754                         t.min = bits;
1755                 if (t.max < (unsigned)bits)
1756                         t.max = bits;
1757         }
1758         t.integer = 1;
1759         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1760 }
1761
1762 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1763 #error "Change this table"
1764 #endif
1765
1766 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1767                                  48000, 64000, 88200, 96000, 176400, 192000 };
1768
1769 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1770         .count = ARRAY_SIZE(rates),
1771         .list = rates,
1772 };
1773
1774 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1775                                 struct snd_pcm_hw_rule *rule)
1776 {
1777         struct snd_pcm_hardware *hw = rule->private;
1778         return snd_interval_list(hw_param_interval(params, rule->var),
1779                                  snd_pcm_known_rates.count,
1780                                  snd_pcm_known_rates.list, hw->rates);
1781 }
1782
1783 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1784                                             struct snd_pcm_hw_rule *rule)
1785 {
1786         struct snd_interval t;
1787         struct snd_pcm_substream *substream = rule->private;
1788         t.min = 0;
1789         t.max = substream->buffer_bytes_max;
1790         t.openmin = 0;
1791         t.openmax = 0;
1792         t.integer = 1;
1793         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1794 }
1795
1796 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1797 {
1798         struct snd_pcm_runtime *runtime = substream->runtime;
1799         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1800         int k, err;
1801
1802         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1803                 snd_mask_any(constrs_mask(constrs, k));
1804         }
1805
1806         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1807                 snd_interval_any(constrs_interval(constrs, k));
1808         }
1809
1810         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1811         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1812         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1813         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1814         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1815
1816         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1817                                    snd_pcm_hw_rule_format, NULL,
1818                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1819         if (err < 0)
1820                 return err;
1821         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1822                                   snd_pcm_hw_rule_sample_bits, NULL,
1823                                   SNDRV_PCM_HW_PARAM_FORMAT,
1824                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1825         if (err < 0)
1826                 return err;
1827         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1828                                   snd_pcm_hw_rule_div, NULL,
1829                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1830         if (err < 0)
1831                 return err;
1832         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1833                                   snd_pcm_hw_rule_mul, NULL,
1834                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1835         if (err < 0)
1836                 return err;
1837         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1838                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1839                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1840         if (err < 0)
1841                 return err;
1842         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1843                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1844                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1845         if (err < 0)
1846                 return err;
1847         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1848                                   snd_pcm_hw_rule_div, NULL,
1849                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1850         if (err < 0)
1851                 return err;
1852         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1853                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1854                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1855         if (err < 0)
1856                 return err;
1857         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1858                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1859                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1860         if (err < 0)
1861                 return err;
1862         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1863                                   snd_pcm_hw_rule_div, NULL,
1864                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1865         if (err < 0)
1866                 return err;
1867         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1868                                   snd_pcm_hw_rule_div, NULL,
1869                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1870         if (err < 0)
1871                 return err;
1872         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1873                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1874                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1875         if (err < 0)
1876                 return err;
1877         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1878                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1879                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1880         if (err < 0)
1881                 return err;
1882         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1883                                   snd_pcm_hw_rule_mul, NULL,
1884                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1885         if (err < 0)
1886                 return err;
1887         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1888                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1889                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1890         if (err < 0)
1891                 return err;
1892         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1893                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1894                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1895         if (err < 0)
1896                 return err;
1897         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1898                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1899                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1900         if (err < 0)
1901                 return err;
1902         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1903                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1904                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1905         if (err < 0)
1906                 return err;
1907         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1908                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1909                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1910         if (err < 0)
1911                 return err;
1912         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1913                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1914                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1915         if (err < 0)
1916                 return err;
1917         return 0;
1918 }
1919
1920 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1921 {
1922         struct snd_pcm_runtime *runtime = substream->runtime;
1923         struct snd_pcm_hardware *hw = &runtime->hw;
1924         int err;
1925         unsigned int mask = 0;
1926
1927         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1928                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1929         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1930                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1931         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1932                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1933                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1934                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1935                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1936                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1937                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1938         }
1939         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1940         snd_assert(err >= 0, return -EINVAL);
1941
1942         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1943         snd_assert(err >= 0, return -EINVAL);
1944
1945         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1946         snd_assert(err >= 0, return -EINVAL);
1947
1948         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1949                                            hw->channels_min, hw->channels_max);
1950         snd_assert(err >= 0, return -EINVAL);
1951
1952         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1953                                            hw->rate_min, hw->rate_max);
1954         snd_assert(err >= 0, return -EINVAL);
1955
1956         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1957                                            hw->period_bytes_min, hw->period_bytes_max);
1958         snd_assert(err >= 0, return -EINVAL);
1959
1960         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1961                                            hw->periods_min, hw->periods_max);
1962         snd_assert(err >= 0, return -EINVAL);
1963
1964         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1965                                            hw->period_bytes_min, hw->buffer_bytes_max);
1966         snd_assert(err >= 0, return -EINVAL);
1967
1968         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1969                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1970                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1971         if (err < 0)
1972                 return err;
1973
1974         /* FIXME: remove */
1975         if (runtime->dma_bytes) {
1976                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1977                 snd_assert(err >= 0, return -EINVAL);
1978         }
1979
1980         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1981                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1982                                           snd_pcm_hw_rule_rate, hw,
1983                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1984                 if (err < 0)
1985                         return err;
1986         }
1987
1988         /* FIXME: this belong to lowlevel */
1989         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
1990
1991         return 0;
1992 }
1993
1994 static void pcm_release_private(struct snd_pcm_substream *substream)
1995 {
1996         snd_pcm_unlink(substream);
1997 }
1998
1999 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2000 {
2001         substream->ref_count--;
2002         if (substream->ref_count > 0)
2003                 return;
2004
2005         snd_pcm_drop(substream);
2006         if (substream->hw_opened) {
2007                 if (substream->ops->hw_free != NULL)
2008                         substream->ops->hw_free(substream);
2009                 substream->ops->close(substream);
2010                 substream->hw_opened = 0;
2011         }
2012         if (substream->pcm_release) {
2013                 substream->pcm_release(substream);
2014                 substream->pcm_release = NULL;
2015         }
2016         snd_pcm_detach_substream(substream);
2017 }
2018
2019 EXPORT_SYMBOL(snd_pcm_release_substream);
2020
2021 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2022                            struct file *file,
2023                            struct snd_pcm_substream **rsubstream)
2024 {
2025         struct snd_pcm_substream *substream;
2026         int err;
2027
2028         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2029         if (err < 0)
2030                 return err;
2031         if (substream->ref_count > 1) {
2032                 *rsubstream = substream;
2033                 return 0;
2034         }
2035
2036         err = snd_pcm_hw_constraints_init(substream);
2037         if (err < 0) {
2038                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2039                 goto error;
2040         }
2041
2042         if ((err = substream->ops->open(substream)) < 0)
2043                 goto error;
2044
2045         substream->hw_opened = 1;
2046
2047         err = snd_pcm_hw_constraints_complete(substream);
2048         if (err < 0) {
2049                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2050                 goto error;
2051         }
2052
2053         *rsubstream = substream;
2054         return 0;
2055
2056  error:
2057         snd_pcm_release_substream(substream);
2058         return err;
2059 }
2060
2061 EXPORT_SYMBOL(snd_pcm_open_substream);
2062
2063 static int snd_pcm_open_file(struct file *file,
2064                              struct snd_pcm *pcm,
2065                              int stream,
2066                              struct snd_pcm_file **rpcm_file)
2067 {
2068         struct snd_pcm_file *pcm_file;
2069         struct snd_pcm_substream *substream;
2070         struct snd_pcm_str *str;
2071         int err;
2072
2073         snd_assert(rpcm_file != NULL, return -EINVAL);
2074         *rpcm_file = NULL;
2075
2076         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2077         if (err < 0)
2078                 return err;
2079
2080         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2081         if (pcm_file == NULL) {
2082                 snd_pcm_release_substream(substream);
2083                 return -ENOMEM;
2084         }
2085         pcm_file->substream = substream;
2086         if (substream->ref_count == 1) {
2087                 str = substream->pstr;
2088                 substream->file = pcm_file;
2089                 substream->pcm_release = pcm_release_private;
2090         }
2091         file->private_data = pcm_file;
2092         *rpcm_file = pcm_file;
2093         return 0;
2094 }
2095
2096 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2097 {
2098         struct snd_pcm *pcm;
2099
2100         pcm = snd_lookup_minor_data(iminor(inode),
2101                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2102         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2103 }
2104
2105 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2106 {
2107         struct snd_pcm *pcm;
2108
2109         pcm = snd_lookup_minor_data(iminor(inode),
2110                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2111         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2112 }
2113
2114 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2115 {
2116         int err;
2117         struct snd_pcm_file *pcm_file;
2118         wait_queue_t wait;
2119
2120         if (pcm == NULL) {
2121                 err = -ENODEV;
2122                 goto __error1;
2123         }
2124         err = snd_card_file_add(pcm->card, file);
2125         if (err < 0)
2126                 goto __error1;
2127         if (!try_module_get(pcm->card->module)) {
2128                 err = -EFAULT;
2129                 goto __error2;
2130         }
2131         init_waitqueue_entry(&wait, current);
2132         add_wait_queue(&pcm->open_wait, &wait);
2133         mutex_lock(&pcm->open_mutex);
2134         while (1) {
2135                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2136                 if (err >= 0)
2137                         break;
2138                 if (err == -EAGAIN) {
2139                         if (file->f_flags & O_NONBLOCK) {
2140                                 err = -EBUSY;
2141                                 break;
2142                         }
2143                 } else
2144                         break;
2145                 set_current_state(TASK_INTERRUPTIBLE);
2146                 mutex_unlock(&pcm->open_mutex);
2147                 schedule();
2148                 mutex_lock(&pcm->open_mutex);
2149                 if (signal_pending(current)) {
2150                         err = -ERESTARTSYS;
2151                         break;
2152                 }
2153         }
2154         remove_wait_queue(&pcm->open_wait, &wait);
2155         mutex_unlock(&pcm->open_mutex);
2156         if (err < 0)
2157                 goto __error;
2158         return err;
2159
2160       __error:
2161         module_put(pcm->card->module);
2162       __error2:
2163         snd_card_file_remove(pcm->card, file);
2164       __error1:
2165         return err;
2166 }
2167
2168 static int snd_pcm_release(struct inode *inode, struct file *file)
2169 {
2170         struct snd_pcm *pcm;
2171         struct snd_pcm_substream *substream;
2172         struct snd_pcm_file *pcm_file;
2173
2174         pcm_file = file->private_data;
2175         substream = pcm_file->substream;
2176         snd_assert(substream != NULL, return -ENXIO);
2177         pcm = substream->pcm;
2178         fasync_helper(-1, file, 0, &substream->runtime->fasync);
2179         mutex_lock(&pcm->open_mutex);
2180         snd_pcm_release_substream(substream);
2181         kfree(pcm_file);
2182         mutex_unlock(&pcm->open_mutex);
2183         wake_up(&pcm->open_wait);
2184         module_put(pcm->card->module);
2185         snd_card_file_remove(pcm->card, file);
2186         return 0;
2187 }
2188
2189 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2190                                                  snd_pcm_uframes_t frames)
2191 {
2192         struct snd_pcm_runtime *runtime = substream->runtime;
2193         snd_pcm_sframes_t appl_ptr;
2194         snd_pcm_sframes_t ret;
2195         snd_pcm_sframes_t hw_avail;
2196
2197         if (frames == 0)
2198                 return 0;
2199
2200         snd_pcm_stream_lock_irq(substream);
2201         switch (runtime->status->state) {
2202         case SNDRV_PCM_STATE_PREPARED:
2203                 break;
2204         case SNDRV_PCM_STATE_DRAINING:
2205         case SNDRV_PCM_STATE_RUNNING:
2206                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2207                         break;
2208                 /* Fall through */
2209         case SNDRV_PCM_STATE_XRUN:
2210                 ret = -EPIPE;
2211                 goto __end;
2212         default:
2213                 ret = -EBADFD;
2214                 goto __end;
2215         }
2216
2217         hw_avail = snd_pcm_playback_hw_avail(runtime);
2218         if (hw_avail <= 0) {
2219                 ret = 0;
2220                 goto __end;
2221         }
2222         if (frames > (snd_pcm_uframes_t)hw_avail)
2223                 frames = hw_avail;
2224         appl_ptr = runtime->control->appl_ptr - frames;
2225         if (appl_ptr < 0)
2226                 appl_ptr += runtime->boundary;
2227         runtime->control->appl_ptr = appl_ptr;
2228         ret = frames;
2229  __end:
2230         snd_pcm_stream_unlock_irq(substream);
2231         return ret;
2232 }
2233
2234 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2235                                                 snd_pcm_uframes_t frames)
2236 {
2237         struct snd_pcm_runtime *runtime = substream->runtime;
2238         snd_pcm_sframes_t appl_ptr;
2239         snd_pcm_sframes_t ret;
2240         snd_pcm_sframes_t hw_avail;
2241
2242         if (frames == 0)
2243                 return 0;
2244
2245         snd_pcm_stream_lock_irq(substream);
2246         switch (runtime->status->state) {
2247         case SNDRV_PCM_STATE_PREPARED:
2248         case SNDRV_PCM_STATE_DRAINING:
2249                 break;
2250         case SNDRV_PCM_STATE_RUNNING:
2251                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2252                         break;
2253                 /* Fall through */
2254         case SNDRV_PCM_STATE_XRUN:
2255                 ret = -EPIPE;
2256                 goto __end;
2257         default:
2258                 ret = -EBADFD;
2259                 goto __end;
2260         }
2261
2262         hw_avail = snd_pcm_capture_hw_avail(runtime);
2263         if (hw_avail <= 0) {
2264                 ret = 0;
2265                 goto __end;
2266         }
2267         if (frames > (snd_pcm_uframes_t)hw_avail)
2268                 frames = hw_avail;
2269         appl_ptr = runtime->control->appl_ptr - frames;
2270         if (appl_ptr < 0)
2271                 appl_ptr += runtime->boundary;
2272         runtime->control->appl_ptr = appl_ptr;
2273         ret = frames;
2274  __end:
2275         snd_pcm_stream_unlock_irq(substream);
2276         return ret;
2277 }
2278
2279 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2280                                                   snd_pcm_uframes_t frames)
2281 {
2282         struct snd_pcm_runtime *runtime = substream->runtime;
2283         snd_pcm_sframes_t appl_ptr;
2284         snd_pcm_sframes_t ret;
2285         snd_pcm_sframes_t avail;
2286
2287         if (frames == 0)
2288                 return 0;
2289
2290         snd_pcm_stream_lock_irq(substream);
2291         switch (runtime->status->state) {
2292         case SNDRV_PCM_STATE_PREPARED:
2293         case SNDRV_PCM_STATE_PAUSED:
2294                 break;
2295         case SNDRV_PCM_STATE_DRAINING:
2296         case SNDRV_PCM_STATE_RUNNING:
2297                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2298                         break;
2299                 /* Fall through */
2300         case SNDRV_PCM_STATE_XRUN:
2301                 ret = -EPIPE;
2302                 goto __end;
2303         default:
2304                 ret = -EBADFD;
2305                 goto __end;
2306         }
2307
2308         avail = snd_pcm_playback_avail(runtime);
2309         if (avail <= 0) {
2310                 ret = 0;
2311                 goto __end;
2312         }
2313         if (frames > (snd_pcm_uframes_t)avail)
2314                 frames = avail;
2315         appl_ptr = runtime->control->appl_ptr + frames;
2316         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2317                 appl_ptr -= runtime->boundary;
2318         runtime->control->appl_ptr = appl_ptr;
2319         ret = frames;
2320  __end:
2321         snd_pcm_stream_unlock_irq(substream);
2322         return ret;
2323 }
2324
2325 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2326                                                  snd_pcm_uframes_t frames)
2327 {
2328         struct snd_pcm_runtime *runtime = substream->runtime;
2329         snd_pcm_sframes_t appl_ptr;
2330         snd_pcm_sframes_t ret;
2331         snd_pcm_sframes_t avail;
2332
2333         if (frames == 0)
2334                 return 0;
2335
2336         snd_pcm_stream_lock_irq(substream);
2337         switch (runtime->status->state) {
2338         case SNDRV_PCM_STATE_PREPARED:
2339         case SNDRV_PCM_STATE_DRAINING:
2340         case SNDRV_PCM_STATE_PAUSED:
2341                 break;
2342         case SNDRV_PCM_STATE_RUNNING:
2343                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2344                         break;
2345                 /* Fall through */
2346         case SNDRV_PCM_STATE_XRUN:
2347                 ret = -EPIPE;
2348                 goto __end;
2349         default:
2350                 ret = -EBADFD;
2351                 goto __end;
2352         }
2353
2354         avail = snd_pcm_capture_avail(runtime);
2355         if (avail <= 0) {
2356                 ret = 0;
2357                 goto __end;
2358         }
2359         if (frames > (snd_pcm_uframes_t)avail)
2360                 frames = avail;
2361         appl_ptr = runtime->control->appl_ptr + frames;
2362         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2363                 appl_ptr -= runtime->boundary;
2364         runtime->control->appl_ptr = appl_ptr;
2365         ret = frames;
2366  __end:
2367         snd_pcm_stream_unlock_irq(substream);
2368         return ret;
2369 }
2370
2371 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2372 {
2373         struct snd_pcm_runtime *runtime = substream->runtime;
2374         int err;
2375
2376         snd_pcm_stream_lock_irq(substream);
2377         switch (runtime->status->state) {
2378         case SNDRV_PCM_STATE_DRAINING:
2379                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2380                         goto __badfd;
2381         case SNDRV_PCM_STATE_RUNNING:
2382                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2383                         break;
2384                 /* Fall through */
2385         case SNDRV_PCM_STATE_PREPARED:
2386         case SNDRV_PCM_STATE_SUSPENDED:
2387                 err = 0;
2388                 break;
2389         case SNDRV_PCM_STATE_XRUN:
2390                 err = -EPIPE;
2391                 break;
2392         default:
2393               __badfd:
2394                 err = -EBADFD;
2395                 break;
2396         }
2397         snd_pcm_stream_unlock_irq(substream);
2398         return err;
2399 }
2400
2401 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2402                          snd_pcm_sframes_t __user *res)
2403 {
2404         struct snd_pcm_runtime *runtime = substream->runtime;
2405         int err;
2406         snd_pcm_sframes_t n = 0;
2407
2408         snd_pcm_stream_lock_irq(substream);
2409         switch (runtime->status->state) {
2410         case SNDRV_PCM_STATE_DRAINING:
2411                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2412                         goto __badfd;
2413         case SNDRV_PCM_STATE_RUNNING:
2414                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2415                         break;
2416                 /* Fall through */
2417         case SNDRV_PCM_STATE_PREPARED:
2418         case SNDRV_PCM_STATE_SUSPENDED:
2419                 err = 0;
2420                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2421                         n = snd_pcm_playback_hw_avail(runtime);
2422                 else
2423                         n = snd_pcm_capture_avail(runtime);
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         snd_assert(substream != NULL, return -ENXIO);
2500
2501         switch (cmd) {
2502         case SNDRV_PCM_IOCTL_PVERSION:
2503                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2504         case SNDRV_PCM_IOCTL_INFO:
2505                 return snd_pcm_info_user(substream, arg);
2506         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2507                 return 0;
2508         case SNDRV_PCM_IOCTL_TTSTAMP:
2509                 return snd_pcm_tstamp(substream, arg);
2510         case SNDRV_PCM_IOCTL_HW_REFINE:
2511                 return snd_pcm_hw_refine_user(substream, arg);
2512         case SNDRV_PCM_IOCTL_HW_PARAMS:
2513                 return snd_pcm_hw_params_user(substream, arg);
2514         case SNDRV_PCM_IOCTL_HW_FREE:
2515                 return snd_pcm_hw_free(substream);
2516         case SNDRV_PCM_IOCTL_SW_PARAMS:
2517                 return snd_pcm_sw_params_user(substream, arg);
2518         case SNDRV_PCM_IOCTL_STATUS:
2519                 return snd_pcm_status_user(substream, arg);
2520         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2521                 return snd_pcm_channel_info_user(substream, arg);
2522         case SNDRV_PCM_IOCTL_PREPARE:
2523                 return snd_pcm_prepare(substream, file);
2524         case SNDRV_PCM_IOCTL_RESET:
2525                 return snd_pcm_reset(substream);
2526         case SNDRV_PCM_IOCTL_START:
2527                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2528         case SNDRV_PCM_IOCTL_LINK:
2529                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2530         case SNDRV_PCM_IOCTL_UNLINK:
2531                 return snd_pcm_unlink(substream);
2532         case SNDRV_PCM_IOCTL_RESUME:
2533                 return snd_pcm_resume(substream);
2534         case SNDRV_PCM_IOCTL_XRUN:
2535                 return snd_pcm_xrun(substream);
2536         case SNDRV_PCM_IOCTL_HWSYNC:
2537                 return snd_pcm_hwsync(substream);
2538         case SNDRV_PCM_IOCTL_DELAY:
2539                 return snd_pcm_delay(substream, arg);
2540         case SNDRV_PCM_IOCTL_SYNC_PTR:
2541                 return snd_pcm_sync_ptr(substream, arg);
2542 #ifdef CONFIG_SND_SUPPORT_OLD_API
2543         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2544                 return snd_pcm_hw_refine_old_user(substream, arg);
2545         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2546                 return snd_pcm_hw_params_old_user(substream, arg);
2547 #endif
2548         case SNDRV_PCM_IOCTL_DRAIN:
2549                 return snd_pcm_drain(substream);
2550         case SNDRV_PCM_IOCTL_DROP:
2551                 return snd_pcm_drop(substream);
2552         case SNDRV_PCM_IOCTL_PAUSE:
2553         {
2554                 int res;
2555                 snd_pcm_stream_lock_irq(substream);
2556                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2557                 snd_pcm_stream_unlock_irq(substream);
2558                 return res;
2559         }
2560         }
2561         snd_printd("unknown ioctl = 0x%x\n", cmd);
2562         return -ENOTTY;
2563 }
2564
2565 static int snd_pcm_playback_ioctl1(struct file *file,
2566                                    struct snd_pcm_substream *substream,
2567                                    unsigned int cmd, void __user *arg)
2568 {
2569         snd_assert(substream != NULL, return -ENXIO);
2570         snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, 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                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2604                 if (bufs == NULL)
2605                         return -ENOMEM;
2606                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2607                         kfree(bufs);
2608                         return -EFAULT;
2609                 }
2610                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2611                 kfree(bufs);
2612                 __put_user(result, &_xfern->result);
2613                 return result < 0 ? result : 0;
2614         }
2615         case SNDRV_PCM_IOCTL_REWIND:
2616         {
2617                 snd_pcm_uframes_t frames;
2618                 snd_pcm_uframes_t __user *_frames = arg;
2619                 snd_pcm_sframes_t result;
2620                 if (get_user(frames, _frames))
2621                         return -EFAULT;
2622                 if (put_user(0, _frames))
2623                         return -EFAULT;
2624                 result = snd_pcm_playback_rewind(substream, frames);
2625                 __put_user(result, _frames);
2626                 return result < 0 ? result : 0;
2627         }
2628         case SNDRV_PCM_IOCTL_FORWARD:
2629         {
2630                 snd_pcm_uframes_t frames;
2631                 snd_pcm_uframes_t __user *_frames = arg;
2632                 snd_pcm_sframes_t result;
2633                 if (get_user(frames, _frames))
2634                         return -EFAULT;
2635                 if (put_user(0, _frames))
2636                         return -EFAULT;
2637                 result = snd_pcm_playback_forward(substream, frames);
2638                 __put_user(result, _frames);
2639                 return result < 0 ? result : 0;
2640         }
2641         }
2642         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2643 }
2644
2645 static int snd_pcm_capture_ioctl1(struct file *file,
2646                                   struct snd_pcm_substream *substream,
2647                                   unsigned int cmd, void __user *arg)
2648 {
2649         snd_assert(substream != NULL, return -ENXIO);
2650         snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, 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                 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL);
2684                 if (bufs == NULL)
2685                         return -ENOMEM;
2686                 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) {
2687                         kfree(bufs);
2688                         return -EFAULT;
2689                 }
2690                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2691                 kfree(bufs);
2692                 __put_user(result, &_xfern->result);
2693                 return result < 0 ? result : 0;
2694         }
2695         case SNDRV_PCM_IOCTL_REWIND:
2696         {
2697                 snd_pcm_uframes_t frames;
2698                 snd_pcm_uframes_t __user *_frames = arg;
2699                 snd_pcm_sframes_t result;
2700                 if (get_user(frames, _frames))
2701                         return -EFAULT;
2702                 if (put_user(0, _frames))
2703                         return -EFAULT;
2704                 result = snd_pcm_capture_rewind(substream, frames);
2705                 __put_user(result, _frames);
2706                 return result < 0 ? result : 0;
2707         }
2708         case SNDRV_PCM_IOCTL_FORWARD:
2709         {
2710                 snd_pcm_uframes_t frames;
2711                 snd_pcm_uframes_t __user *_frames = arg;
2712                 snd_pcm_sframes_t result;
2713                 if (get_user(frames, _frames))
2714                         return -EFAULT;
2715                 if (put_user(0, _frames))
2716                         return -EFAULT;
2717                 result = snd_pcm_capture_forward(substream, frames);
2718                 __put_user(result, _frames);
2719                 return result < 0 ? result : 0;
2720         }
2721         }
2722         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2723 }
2724
2725 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2726                                    unsigned long arg)
2727 {
2728         struct snd_pcm_file *pcm_file;
2729
2730         pcm_file = file->private_data;
2731
2732         if (((cmd >> 8) & 0xff) != 'A')
2733                 return -ENOTTY;
2734
2735         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2736                                        (void __user *)arg);
2737 }
2738
2739 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2740                                   unsigned long arg)
2741 {
2742         struct snd_pcm_file *pcm_file;
2743
2744         pcm_file = file->private_data;
2745
2746         if (((cmd >> 8) & 0xff) != 'A')
2747                 return -ENOTTY;
2748
2749         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2750                                       (void __user *)arg);
2751 }
2752
2753 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2754                          unsigned int cmd, void *arg)
2755 {
2756         mm_segment_t fs;
2757         int result;
2758
2759         fs = snd_enter_user();
2760         switch (substream->stream) {
2761         case SNDRV_PCM_STREAM_PLAYBACK:
2762                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2763                                                  (void __user *)arg);
2764                 break;
2765         case SNDRV_PCM_STREAM_CAPTURE:
2766                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2767                                                 (void __user *)arg);
2768                 break;
2769         default:
2770                 result = -EINVAL;
2771                 break;
2772         }
2773         snd_leave_user(fs);
2774         return result;
2775 }
2776
2777 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2778
2779 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2780                             loff_t * offset)
2781 {
2782         struct snd_pcm_file *pcm_file;
2783         struct snd_pcm_substream *substream;
2784         struct snd_pcm_runtime *runtime;
2785         snd_pcm_sframes_t result;
2786
2787         pcm_file = file->private_data;
2788         substream = pcm_file->substream;
2789         snd_assert(substream != NULL, return -ENXIO);
2790         runtime = substream->runtime;
2791         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2792                 return -EBADFD;
2793         if (!frame_aligned(runtime, count))
2794                 return -EINVAL;
2795         count = bytes_to_frames(runtime, count);
2796         result = snd_pcm_lib_read(substream, buf, count);
2797         if (result > 0)
2798                 result = frames_to_bytes(runtime, result);
2799         return result;
2800 }
2801
2802 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2803                              size_t count, loff_t * offset)
2804 {
2805         struct snd_pcm_file *pcm_file;
2806         struct snd_pcm_substream *substream;
2807         struct snd_pcm_runtime *runtime;
2808         snd_pcm_sframes_t result;
2809
2810         pcm_file = file->private_data;
2811         substream = pcm_file->substream;
2812         snd_assert(substream != NULL, result = -ENXIO; goto end);
2813         runtime = substream->runtime;
2814         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2815                 result = -EBADFD;
2816                 goto end;
2817         }
2818         if (!frame_aligned(runtime, count)) {
2819                 result = -EINVAL;
2820                 goto end;
2821         }
2822         count = bytes_to_frames(runtime, count);
2823         result = snd_pcm_lib_write(substream, buf, count);
2824         if (result > 0)
2825                 result = frames_to_bytes(runtime, result);
2826  end:
2827         return result;
2828 }
2829
2830 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2831                              unsigned long nr_segs, loff_t pos)
2832
2833 {
2834         struct snd_pcm_file *pcm_file;
2835         struct snd_pcm_substream *substream;
2836         struct snd_pcm_runtime *runtime;
2837         snd_pcm_sframes_t result;
2838         unsigned long i;
2839         void __user **bufs;
2840         snd_pcm_uframes_t frames;
2841
2842         pcm_file = iocb->ki_filp->private_data;
2843         substream = pcm_file->substream;
2844         snd_assert(substream != NULL, return -ENXIO);
2845         runtime = substream->runtime;
2846         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2847                 return -EBADFD;
2848         if (nr_segs > 1024 || nr_segs != runtime->channels)
2849                 return -EINVAL;
2850         if (!frame_aligned(runtime, iov->iov_len))
2851                 return -EINVAL;
2852         frames = bytes_to_samples(runtime, iov->iov_len);
2853         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2854         if (bufs == NULL)
2855                 return -ENOMEM;
2856         for (i = 0; i < nr_segs; ++i)
2857                 bufs[i] = iov[i].iov_base;
2858         result = snd_pcm_lib_readv(substream, bufs, frames);
2859         if (result > 0)
2860                 result = frames_to_bytes(runtime, result);
2861         kfree(bufs);
2862         return result;
2863 }
2864
2865 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2866                               unsigned long nr_segs, loff_t pos)
2867 {
2868         struct snd_pcm_file *pcm_file;
2869         struct snd_pcm_substream *substream;
2870         struct snd_pcm_runtime *runtime;
2871         snd_pcm_sframes_t result;
2872         unsigned long i;
2873         void __user **bufs;
2874         snd_pcm_uframes_t frames;
2875
2876         pcm_file = iocb->ki_filp->private_data;
2877         substream = pcm_file->substream;
2878         snd_assert(substream != NULL, result = -ENXIO; goto end);
2879         runtime = substream->runtime;
2880         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
2881                 result = -EBADFD;
2882                 goto end;
2883         }
2884         if (nr_segs > 128 || nr_segs != runtime->channels ||
2885             !frame_aligned(runtime, iov->iov_len)) {
2886                 result = -EINVAL;
2887                 goto end;
2888         }
2889         frames = bytes_to_samples(runtime, iov->iov_len);
2890         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2891         if (bufs == NULL)
2892                 return -ENOMEM;
2893         for (i = 0; i < nr_segs; ++i)
2894                 bufs[i] = iov[i].iov_base;
2895         result = snd_pcm_lib_writev(substream, bufs, frames);
2896         if (result > 0)
2897                 result = frames_to_bytes(runtime, result);
2898         kfree(bufs);
2899  end:
2900         return result;
2901 }
2902
2903 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2904 {
2905         struct snd_pcm_file *pcm_file;
2906         struct snd_pcm_substream *substream;
2907         struct snd_pcm_runtime *runtime;
2908         unsigned int mask;
2909         snd_pcm_uframes_t avail;
2910
2911         pcm_file = file->private_data;
2912
2913         substream = pcm_file->substream;
2914         snd_assert(substream != NULL, return -ENXIO);
2915         runtime = substream->runtime;
2916
2917         poll_wait(file, &runtime->sleep, wait);
2918
2919         snd_pcm_stream_lock_irq(substream);
2920         avail = snd_pcm_playback_avail(runtime);
2921         switch (runtime->status->state) {
2922         case SNDRV_PCM_STATE_RUNNING:
2923         case SNDRV_PCM_STATE_PREPARED:
2924         case SNDRV_PCM_STATE_PAUSED:
2925                 if (avail >= runtime->control->avail_min) {
2926                         mask = POLLOUT | POLLWRNORM;
2927                         break;
2928                 }
2929                 /* Fall through */
2930         case SNDRV_PCM_STATE_DRAINING:
2931                 mask = 0;
2932                 break;
2933         default:
2934                 mask = POLLOUT | POLLWRNORM | POLLERR;
2935                 break;
2936         }
2937         snd_pcm_stream_unlock_irq(substream);
2938         return mask;
2939 }
2940
2941 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2942 {
2943         struct snd_pcm_file *pcm_file;
2944         struct snd_pcm_substream *substream;
2945         struct snd_pcm_runtime *runtime;
2946         unsigned int mask;
2947         snd_pcm_uframes_t avail;
2948
2949         pcm_file = file->private_data;
2950
2951         substream = pcm_file->substream;
2952         snd_assert(substream != NULL, return -ENXIO);
2953         runtime = substream->runtime;
2954
2955         poll_wait(file, &runtime->sleep, wait);
2956
2957         snd_pcm_stream_lock_irq(substream);
2958         avail = snd_pcm_capture_avail(runtime);
2959         switch (runtime->status->state) {
2960         case SNDRV_PCM_STATE_RUNNING:
2961         case SNDRV_PCM_STATE_PREPARED:
2962         case SNDRV_PCM_STATE_PAUSED:
2963                 if (avail >= runtime->control->avail_min) {
2964                         mask = POLLIN | POLLRDNORM;
2965                         break;
2966                 }
2967                 mask = 0;
2968                 break;
2969         case SNDRV_PCM_STATE_DRAINING:
2970                 if (avail > 0) {
2971                         mask = POLLIN | POLLRDNORM;
2972                         break;
2973                 }
2974                 /* Fall through */
2975         default:
2976                 mask = POLLIN | POLLRDNORM | POLLERR;
2977                 break;
2978         }
2979         snd_pcm_stream_unlock_irq(substream);
2980         return mask;
2981 }
2982
2983 /*
2984  * mmap support
2985  */
2986
2987 /*
2988  * Only on coherent architectures, we can mmap the status and the control records
2989  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
2990  */
2991 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
2992 /*
2993  * mmap status record
2994  */
2995 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
2996                                                 struct vm_fault *vmf)
2997 {
2998         struct snd_pcm_substream *substream = area->vm_private_data;
2999         struct snd_pcm_runtime *runtime;
3000
3001         if (substream == NULL)
3002                 return VM_FAULT_SIGBUS;
3003         runtime = substream->runtime;
3004         vmf->page = virt_to_page(runtime->status);
3005         get_page(vmf->page);
3006         return 0;
3007 }
3008
3009 static struct vm_operations_struct snd_pcm_vm_ops_status =
3010 {
3011         .fault =        snd_pcm_mmap_status_fault,
3012 };
3013
3014 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3015                                struct vm_area_struct *area)
3016 {
3017         struct snd_pcm_runtime *runtime;
3018         long size;
3019         if (!(area->vm_flags & VM_READ))
3020                 return -EINVAL;
3021         runtime = substream->runtime;
3022         snd_assert(runtime != NULL, return -EAGAIN);
3023         size = area->vm_end - area->vm_start;
3024         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3025                 return -EINVAL;
3026         area->vm_ops = &snd_pcm_vm_ops_status;
3027         area->vm_private_data = substream;
3028         area->vm_flags |= VM_RESERVED;
3029         return 0;
3030 }
3031
3032 /*
3033  * mmap control record
3034  */
3035 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3036                                                 struct vm_fault *vmf)
3037 {
3038         struct snd_pcm_substream *substream = area->vm_private_data;
3039         struct snd_pcm_runtime *runtime;
3040
3041         if (substream == NULL)
3042                 return VM_FAULT_SIGBUS;
3043         runtime = substream->runtime;
3044         vmf->page = virt_to_page(runtime->control);
3045         get_page(vmf->page);
3046         return 0;
3047 }
3048
3049 static struct vm_operations_struct snd_pcm_vm_ops_control =
3050 {
3051         .fault =        snd_pcm_mmap_control_fault,
3052 };
3053
3054 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3055                                 struct vm_area_struct *area)
3056 {
3057         struct snd_pcm_runtime *runtime;
3058         long size;
3059         if (!(area->vm_flags & VM_READ))
3060                 return -EINVAL;
3061         runtime = substream->runtime;
3062         snd_assert(runtime != NULL, return -EAGAIN);
3063         size = area->vm_end - area->vm_start;
3064         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3065                 return -EINVAL;
3066         area->vm_ops = &snd_pcm_vm_ops_control;
3067         area->vm_private_data = substream;
3068         area->vm_flags |= VM_RESERVED;
3069         return 0;
3070 }
3071 #else /* ! coherent mmap */
3072 /*
3073  * don't support mmap for status and control records.
3074  */
3075 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3076                                struct vm_area_struct *area)
3077 {
3078         return -ENXIO;
3079 }
3080 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3081                                 struct vm_area_struct *area)
3082 {
3083         return -ENXIO;
3084 }
3085 #endif /* coherent mmap */
3086
3087 /*
3088  * fault callback for mmapping a RAM page
3089  */
3090 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3091                                                 struct vm_fault *vmf)
3092 {
3093         struct snd_pcm_substream *substream = area->vm_private_data;
3094         struct snd_pcm_runtime *runtime;
3095         unsigned long offset;
3096         struct page * page;
3097         void *vaddr;
3098         size_t dma_bytes;
3099
3100         if (substream == NULL)
3101                 return VM_FAULT_SIGBUS;
3102         runtime = substream->runtime;
3103         offset = vmf->pgoff << PAGE_SHIFT;
3104         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3105         if (offset > dma_bytes - PAGE_SIZE)
3106                 return VM_FAULT_SIGBUS;
3107         if (substream->ops->page) {
3108                 page = substream->ops->page(substream, offset);
3109                 if (!page)
3110                         return VM_FAULT_SIGBUS;
3111         } else {
3112                 vaddr = runtime->dma_area + offset;
3113                 page = virt_to_page(vaddr);
3114         }
3115         get_page(page);
3116         vmf->page = page;
3117         return 0;
3118 }
3119
3120 static struct vm_operations_struct snd_pcm_vm_ops_data =
3121 {
3122         .open =         snd_pcm_mmap_data_open,
3123         .close =        snd_pcm_mmap_data_close,
3124         .fault =        snd_pcm_mmap_data_fault,
3125 };
3126
3127 /*
3128  * mmap the DMA buffer on RAM
3129  */
3130 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3131                                 struct vm_area_struct *area)
3132 {
3133         area->vm_ops = &snd_pcm_vm_ops_data;
3134         area->vm_private_data = substream;
3135         area->vm_flags |= VM_RESERVED;
3136         atomic_inc(&substream->mmap_count);
3137         return 0;
3138 }
3139
3140 /*
3141  * mmap the DMA buffer on I/O memory area
3142  */
3143 #if SNDRV_PCM_INFO_MMAP_IOMEM
3144 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
3145 {
3146         .open =         snd_pcm_mmap_data_open,
3147         .close =        snd_pcm_mmap_data_close,
3148 };
3149
3150 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3151                            struct vm_area_struct *area)
3152 {
3153         long size;
3154         unsigned long offset;
3155
3156 #ifdef pgprot_noncached
3157         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3158 #endif
3159         area->vm_ops = &snd_pcm_vm_ops_data_mmio;
3160         area->vm_private_data = substream;
3161         area->vm_flags |= VM_IO;
3162         size = area->vm_end - area->vm_start;
3163         offset = area->vm_pgoff << PAGE_SHIFT;
3164         if (io_remap_pfn_range(area, area->vm_start,
3165                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3166                                 size, area->vm_page_prot))
3167                 return -EAGAIN;
3168         atomic_inc(&substream->mmap_count);
3169         return 0;
3170 }
3171
3172 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3173 #endif /* SNDRV_PCM_INFO_MMAP */
3174
3175 /*
3176  * mmap DMA buffer
3177  */
3178 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3179                       struct vm_area_struct *area)
3180 {
3181         struct snd_pcm_runtime *runtime;
3182         long size;
3183         unsigned long offset;
3184         size_t dma_bytes;
3185
3186         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3187                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3188                         return -EINVAL;
3189         } else {
3190                 if (!(area->vm_flags & VM_READ))
3191                         return -EINVAL;
3192         }
3193         runtime = substream->runtime;
3194         snd_assert(runtime != NULL, return -EAGAIN);
3195         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3196                 return -EBADFD;
3197         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3198                 return -ENXIO;
3199         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3200             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3201                 return -EINVAL;
3202         size = area->vm_end - area->vm_start;
3203         offset = area->vm_pgoff << PAGE_SHIFT;
3204         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3205         if ((size_t)size > dma_bytes)
3206                 return -EINVAL;
3207         if (offset > dma_bytes - size)
3208                 return -EINVAL;
3209
3210         if (substream->ops->mmap)
3211                 return substream->ops->mmap(substream, area);
3212         else
3213                 return snd_pcm_default_mmap(substream, area);
3214 }
3215
3216 EXPORT_SYMBOL(snd_pcm_mmap_data);
3217
3218 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3219 {
3220         struct snd_pcm_file * pcm_file;
3221         struct snd_pcm_substream *substream;
3222         unsigned long offset;
3223
3224         pcm_file = file->private_data;
3225         substream = pcm_file->substream;
3226         snd_assert(substream != NULL, return -ENXIO);
3227
3228         offset = area->vm_pgoff << PAGE_SHIFT;
3229         switch (offset) {
3230         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3231                 if (pcm_file->no_compat_mmap)
3232                         return -ENXIO;
3233                 return snd_pcm_mmap_status(substream, file, area);
3234         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3235                 if (pcm_file->no_compat_mmap)
3236                         return -ENXIO;
3237                 return snd_pcm_mmap_control(substream, file, area);
3238         default:
3239                 return snd_pcm_mmap_data(substream, file, area);
3240         }
3241         return 0;
3242 }
3243
3244 static int snd_pcm_fasync(int fd, struct file * file, int on)
3245 {
3246         struct snd_pcm_file * pcm_file;
3247         struct snd_pcm_substream *substream;
3248         struct snd_pcm_runtime *runtime;
3249         int err;
3250
3251         pcm_file = file->private_data;
3252         substream = pcm_file->substream;
3253         snd_assert(substream != NULL, return -ENXIO);
3254         runtime = substream->runtime;
3255
3256         err = fasync_helper(fd, file, on, &runtime->fasync);
3257         if (err < 0)
3258                 return err;
3259         return 0;
3260 }
3261
3262 /*
3263  * ioctl32 compat
3264  */
3265 #ifdef CONFIG_COMPAT
3266 #include "pcm_compat.c"
3267 #else
3268 #define snd_pcm_ioctl_compat    NULL
3269 #endif
3270
3271 /*
3272  *  To be removed helpers to keep binary compatibility
3273  */
3274
3275 #ifdef CONFIG_SND_SUPPORT_OLD_API
3276 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3277 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3278
3279 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3280                                                struct snd_pcm_hw_params_old *oparams)
3281 {
3282         unsigned int i;
3283
3284         memset(params, 0, sizeof(*params));
3285         params->flags = oparams->flags;
3286         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3287                 params->masks[i].bits[0] = oparams->masks[i];
3288         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3289         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3290         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3291         params->info = oparams->info;
3292         params->msbits = oparams->msbits;
3293         params->rate_num = oparams->rate_num;
3294         params->rate_den = oparams->rate_den;
3295         params->fifo_size = oparams->fifo_size;
3296 }
3297
3298 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3299                                              struct snd_pcm_hw_params *params)
3300 {
3301         unsigned int i;
3302
3303         memset(oparams, 0, sizeof(*oparams));
3304         oparams->flags = params->flags;
3305         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3306                 oparams->masks[i] = params->masks[i].bits[0];
3307         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3308         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3309         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3310         oparams->info = params->info;
3311         oparams->msbits = params->msbits;
3312         oparams->rate_num = params->rate_num;
3313         oparams->rate_den = params->rate_den;
3314         oparams->fifo_size = params->fifo_size;
3315 }
3316
3317 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3318                                       struct snd_pcm_hw_params_old __user * _oparams)
3319 {
3320         struct snd_pcm_hw_params *params;
3321         struct snd_pcm_hw_params_old *oparams = NULL;
3322         int err;
3323
3324         params = kmalloc(sizeof(*params), GFP_KERNEL);
3325         if (!params) {
3326                 err = -ENOMEM;
3327                 goto out;
3328         }
3329         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3330         if (!oparams) {
3331                 err = -ENOMEM;
3332                 goto out;
3333         }
3334
3335         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3336                 err = -EFAULT;
3337                 goto out;
3338         }
3339         snd_pcm_hw_convert_from_old_params(params, oparams);
3340         err = snd_pcm_hw_refine(substream, params);
3341         snd_pcm_hw_convert_to_old_params(oparams, params);
3342         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3343                 if (!err)
3344                         err = -EFAULT;
3345         }
3346 out:
3347         kfree(params);
3348         kfree(oparams);
3349         return err;
3350 }
3351
3352 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3353                                       struct snd_pcm_hw_params_old __user * _oparams)
3354 {
3355         struct snd_pcm_hw_params *params;
3356         struct snd_pcm_hw_params_old *oparams = NULL;
3357         int err;
3358
3359         params = kmalloc(sizeof(*params), GFP_KERNEL);
3360         if (!params) {
3361                 err = -ENOMEM;
3362                 goto out;
3363         }
3364         oparams = kmalloc(sizeof(*oparams), GFP_KERNEL);
3365         if (!oparams) {
3366                 err = -ENOMEM;
3367                 goto out;
3368         }
3369         if (copy_from_user(oparams, _oparams, sizeof(*oparams))) {
3370                 err = -EFAULT;
3371                 goto out;
3372         }
3373         snd_pcm_hw_convert_from_old_params(params, oparams);
3374         err = snd_pcm_hw_params(substream, params);
3375         snd_pcm_hw_convert_to_old_params(oparams, params);
3376         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3377                 if (!err)
3378                         err = -EFAULT;
3379         }
3380 out:
3381         kfree(params);
3382         kfree(oparams);
3383         return err;
3384 }
3385 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3386
3387 /*
3388  *  Register section
3389  */
3390
3391 const struct file_operations snd_pcm_f_ops[2] = {
3392         {
3393                 .owner =                THIS_MODULE,
3394                 .write =                snd_pcm_write,
3395                 .aio_write =            snd_pcm_aio_write,
3396                 .open =                 snd_pcm_playback_open,
3397                 .release =              snd_pcm_release,
3398                 .poll =                 snd_pcm_playback_poll,
3399                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3400                 .compat_ioctl =         snd_pcm_ioctl_compat,
3401                 .mmap =                 snd_pcm_mmap,
3402                 .fasync =               snd_pcm_fasync,
3403         },
3404         {
3405                 .owner =                THIS_MODULE,
3406                 .read =                 snd_pcm_read,
3407                 .aio_read =             snd_pcm_aio_read,
3408                 .open =                 snd_pcm_capture_open,
3409                 .release =              snd_pcm_release,
3410                 .poll =                 snd_pcm_capture_poll,
3411                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3412                 .compat_ioctl =         snd_pcm_ioctl_compat,
3413                 .mmap =                 snd_pcm_mmap,
3414                 .fasync =               snd_pcm_fasync,
3415         }
3416 };