sound/core/pcm_native.c

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