sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos_params.h>
  28 #include <linux/uio.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/math64.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/timer.h>
  37 #include <sound/minors.h>
  38 #include <asm/io.h>
  39 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  40 #include <dma-coherence.h>
  41 #endif
  42
  43 /*
  44  *  Compatibility
  45  */
  46
  47 struct snd_pcm_hw_params_old {
  48         unsigned int flags;
  49         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  50                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  51         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  52                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  53         unsigned int rmask;
  54         unsigned int cmask;
  55         unsigned int info;
  56         unsigned int msbits;
  57         unsigned int rate_num;
  58         unsigned int rate_den;
  59         snd_pcm_uframes_t fifo_size;
  60         unsigned char reserved[64];
  61 };
  62
  63 #ifdef CONFIG_SND_SUPPORT_OLD_API
  64 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  65 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  66
  67 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  68                                       struct snd_pcm_hw_params_old __user * _oparams);
  69 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  70                                       struct snd_pcm_hw_params_old __user * _oparams);
  71 #endif
  72 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  73
  74 /*
  75  *
  76  */
  77
  78 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  79 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  80
  81 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  82
  83 static inline mm_segment_t snd_enter_user(void)
  84 {
  85         mm_segment_t fs = get_fs();
  86         set_fs(get_ds());
  87         return fs;
  88 }
  89
  90 static inline void snd_leave_user(mm_segment_t fs)
  91 {
  92         set_fs(fs);
  93 }
  94
  95
  96
  97 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  98 {
  99         struct snd_pcm_runtime *runtime;
 100         struct snd_pcm *pcm = substream->pcm;
 101         struct snd_pcm_str *pstr = substream->pstr;
 102
 103         memset(info, 0, sizeof(*info));
 104         info->card = pcm->card->number;
 105         info->device = pcm->device;
 106         info->stream = substream->stream;
 107         info->subdevice = substream->number;
 108         strlcpy(info->id, pcm->id, sizeof(info->id));
 109         strlcpy(info->name, pcm->name, sizeof(info->name));
 110         info->dev_class = pcm->dev_class;
 111         info->dev_subclass = pcm->dev_subclass;
 112         info->subdevices_count = pstr->substream_count;
 113         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 114         strlcpy(info->subname, substream->name, sizeof(info->subname));
 115         runtime = substream->runtime;
 116         /* AB: FIXME!!! This is definitely nonsense */
 117         if (runtime) {
 118                 info->sync = runtime->sync;
 119                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 120         }
 121         return 0;
 122 }
 123
 124 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 125                       struct snd_pcm_info __user * _info)
 126 {
 127         struct snd_pcm_info *info;
 128         int err;
 129
 130         info = kmalloc(sizeof(*info), GFP_KERNEL);
 131         if (! info)
 132                 return -ENOMEM;
 133         err = snd_pcm_info(substream, info);
 134         if (err >= 0) {
 135                 if (copy_to_user(_info, info, sizeof(*info)))
 136                         err = -EFAULT;
 137         }
 138         kfree(info);
 139         return err;
 140 }
 141
 142 #undef RULES_DEBUG
 143
 144 #ifdef RULES_DEBUG
 145 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 146 char *snd_pcm_hw_param_names[] = {
 147         HW_PARAM(ACCESS),
 148         HW_PARAM(FORMAT),
 149         HW_PARAM(SUBFORMAT),
 150         HW_PARAM(SAMPLE_BITS),
 151         HW_PARAM(FRAME_BITS),
 152         HW_PARAM(CHANNELS),
 153         HW_PARAM(RATE),
 154         HW_PARAM(PERIOD_TIME),
 155         HW_PARAM(PERIOD_SIZE),
 156         HW_PARAM(PERIOD_BYTES),
 157         HW_PARAM(PERIODS),
 158         HW_PARAM(BUFFER_TIME),
 159         HW_PARAM(BUFFER_SIZE),
 160         HW_PARAM(BUFFER_BYTES),
 161         HW_PARAM(TICK_TIME),
 162 };
 163 #endif
 164
 165 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 166                       struct snd_pcm_hw_params *params)
 167 {
 168         unsigned int k;
 169         struct snd_pcm_hardware *hw;
 170         struct snd_interval *i = NULL;
 171         struct snd_mask *m = NULL;
 172         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 173         unsigned int rstamps[constrs->rules_num];
 174         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 175         unsigned int stamp = 2;
 176         int changed, again;
 177
 178         params->info = 0;
 179         params->fifo_size = 0;
 180         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 181                 params->msbits = 0;
 182         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 183                 params->rate_num = 0;
 184                 params->rate_den = 0;
 185         }
 186
 187         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 188                 m = hw_param_mask(params, k);
 189                 if (snd_mask_empty(m))
 190                         return -EINVAL;
 191                 if (!(params->rmask & (1 << k)))
 192                         continue;
 193 #ifdef RULES_DEBUG
 194                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 195                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 196 #endif
 197                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 198 #ifdef RULES_DEBUG
 199                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 200 #endif
 201                 if (changed)
 202                         params->cmask |= 1 << k;
 203                 if (changed < 0)
 204                         return changed;
 205         }
 206
 207         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 208                 i = hw_param_interval(params, k);
 209                 if (snd_interval_empty(i))
 210                         return -EINVAL;
 211                 if (!(params->rmask & (1 << k)))
 212                         continue;
 213 #ifdef RULES_DEBUG
 214                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 215                 if (i->empty)
 216                         printk("empty");
 217                 else
 218                         printk("%c%u %u%c",
 219                                i->openmin ? '(' : '[', i->min,
 220                                i->max, i->openmax ? ')' : ']');
 221                 printk(" -> ");
 222 #endif
 223                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 224 #ifdef RULES_DEBUG
 225                 if (i->empty)
 226                         printk("empty\n");
 227                 else
 228                         printk("%c%u %u%c\n",
 229                                i->openmin ? '(' : '[', i->min,
 230                                i->max, i->openmax ? ')' : ']');
 231 #endif
 232                 if (changed)
 233                         params->cmask |= 1 << k;
 234                 if (changed < 0)
 235                         return changed;
 236         }
 237
 238         for (k = 0; k < constrs->rules_num; k++)
 239                 rstamps[k] = 0;
 240         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 241                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 242         do {
 243                 again = 0;
 244                 for (k = 0; k < constrs->rules_num; k++) {
 245                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 246                         unsigned int d;
 247                         int doit = 0;
 248                         if (r->cond && !(r->cond & params->flags))
 249                                 continue;
 250                         for (d = 0; r->deps[d] >= 0; d++) {
 251                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 252                                         doit = 1;
 253                                         break;
 254                                 }
 255                         }
 256                         if (!doit)
 257                                 continue;
 258 #ifdef RULES_DEBUG
 259                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 260                         if (r->var >= 0) {
 261                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 262                                 if (hw_is_mask(r->var)) {
 263                                         m = hw_param_mask(params, r->var);
 264                                         printk("%x", *m->bits);
 265                                 } else {
 266                                         i = hw_param_interval(params, r->var);
 267                                         if (i->empty)
 268                                                 printk("empty");
 269                                         else
 270                                                 printk("%c%u %u%c",
 271                                                        i->openmin ? '(' : '[', i->min,
 272                                                        i->max, i->openmax ? ')' : ']');
 273                                 }
 274                         }
 275 #endif
 276                         changed = r->func(params, r);
 277 #ifdef RULES_DEBUG
 278                         if (r->var >= 0) {
 279                                 printk(" -> ");
 280                                 if (hw_is_mask(r->var))
 281                                         printk("%x", *m->bits);
 282                                 else {
 283                                         if (i->empty)
 284                                                 printk("empty");
 285                                         else
 286                                                 printk("%c%u %u%c",
 287                                                        i->openmin ? '(' : '[', i->min,
 288                                                        i->max, i->openmax ? ')' : ']');
 289                                 }
 290                         }
 291                         printk("\n");
 292 #endif
 293                         rstamps[k] = stamp;
 294                         if (changed && r->var >= 0) {
 295                                 params->cmask |= (1 << r->var);
 296                                 vstamps[r->var] = stamp;
 297                                 again = 1;
 298                         }
 299                         if (changed < 0)
 300                                 return changed;
 301                         stamp++;
 302                 }
 303         } while (again);
 304         if (!params->msbits) {
 305                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 306                 if (snd_interval_single(i))
 307                         params->msbits = snd_interval_value(i);
 308         }
 309
 310         if (!params->rate_den) {
 311                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 312                 if (snd_interval_single(i)) {
 313                         params->rate_num = snd_interval_value(i);
 314                         params->rate_den = 1;
 315                 }
 316         }
 317
 318         hw = &substream->runtime->hw;
 319         if (!params->info)
 320                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 321         if (!params->fifo_size) {
 322                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 323                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 324                 if (snd_mask_min(m) == snd_mask_max(m) &&
 325                     snd_interval_min(i) == snd_interval_max(i)) {
 326                         changed = substream->ops->ioctl(substream,
 327                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 328                         if (changed < 0)
 329                                 return changed;
 330                 }
 331         }
 332         params->rmask = 0;
 333         return 0;
 334 }
 335
 336 EXPORT_SYMBOL(snd_pcm_hw_refine);
 337
 338 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 339                                   struct snd_pcm_hw_params __user * _params)
 340 {
 341         struct snd_pcm_hw_params *params;
 342         int err;
 343
 344         params = memdup_user(_params, sizeof(*params));
 345         if (IS_ERR(params))
 346                 return PTR_ERR(params);
 347
 348         err = snd_pcm_hw_refine(substream, params);
 349         if (copy_to_user(_params, params, sizeof(*params))) {
 350                 if (!err)
 351                         err = -EFAULT;
 352         }
 353
 354         kfree(params);
 355         return err;
 356 }
 357
 358 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 359 {
 360         int usecs;
 361
 362         if (! runtime->rate)
 363                 return -1; /* invalid */
 364
 365         /* take 75% of period time as the deadline */
 366         usecs = (750000 / runtime->rate) * runtime->period_size;
 367         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 368                 runtime->rate;
 369
 370         return usecs;
 371 }
 372
 373 static int calc_boundary(struct snd_pcm_runtime *runtime)
 374 {
 375         u_int64_t boundary;
 376
 377         boundary = (u_int64_t)runtime->buffer_size *
 378                    (u_int64_t)runtime->period_size;
 379 #if BITS_PER_LONG < 64
 380         /* try to find lowest common multiple for buffer and period */
 381         if (boundary > LONG_MAX - runtime->buffer_size) {
 382                 u_int32_t remainder = -1;
 383                 u_int32_t divident = runtime->buffer_size;
 384                 u_int32_t divisor = runtime->period_size;
 385                 while (remainder) {
 386                         remainder = divident % divisor;
 387                         if (remainder) {
 388                                 divident = divisor;
 389                                 divisor = remainder;
 390                         }
 391                 }
 392                 boundary = div_u64(boundary, divisor);
 393                 if (boundary > LONG_MAX - runtime->buffer_size)
 394                         return -ERANGE;
 395         }
 396 #endif
 397         if (boundary == 0)
 398                 return -ERANGE;
 399         runtime->boundary = boundary;
 400         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 401                 runtime->boundary *= 2;
 402         return 0;
 403 }
 404
 405 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 406                              struct snd_pcm_hw_params *params)
 407 {
 408         struct snd_pcm_runtime *runtime;
 409         int err, usecs;
 410         unsigned int bits;
 411         snd_pcm_uframes_t frames;
 412
 413         if (PCM_RUNTIME_CHECK(substream))
 414                 return -ENXIO;
 415         runtime = substream->runtime;
 416         snd_pcm_stream_lock_irq(substream);
 417         switch (runtime->status->state) {
 418         case SNDRV_PCM_STATE_OPEN:
 419         case SNDRV_PCM_STATE_SETUP:
 420         case SNDRV_PCM_STATE_PREPARED:
 421                 break;
 422         default:
 423                 snd_pcm_stream_unlock_irq(substream);
 424                 return -EBADFD;
 425         }
 426         snd_pcm_stream_unlock_irq(substream);
 427 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 428         if (!substream->oss.oss)
 429 #endif
 430                 if (atomic_read(&substream->mmap_count))
 431                         return -EBADFD;
 432
 433         params->rmask = ~0U;
 434         err = snd_pcm_hw_refine(substream, params);
 435         if (err < 0)
 436                 goto _error;
 437
 438         err = snd_pcm_hw_params_choose(substream, params);
 439         if (err < 0)
 440                 goto _error;
 441
 442         if (substream->ops->hw_params != NULL) {
 443                 err = substream->ops->hw_params(substream, params);
 444                 if (err < 0)
 445                         goto _error;
 446         }
 447
 448         runtime->access = params_access(params);
 449         runtime->format = params_format(params);
 450         runtime->subformat = params_subformat(params);
 451         runtime->channels = params_channels(params);
 452         runtime->rate = params_rate(params);
 453         runtime->period_size = params_period_size(params);
 454         runtime->periods = params_periods(params);
 455         runtime->buffer_size = params_buffer_size(params);
 456         runtime->info = params->info;
 457         runtime->rate_num = params->rate_num;
 458         runtime->rate_den = params->rate_den;
 459
 460         bits = snd_pcm_format_physical_width(runtime->format);
 461         runtime->sample_bits = bits;
 462         bits *= runtime->channels;
 463         runtime->frame_bits = bits;
 464         frames = 1;
 465         while (bits % 8 != 0) {
 466                 bits *= 2;
 467                 frames *= 2;
 468         }
 469         runtime->byte_align = bits / 8;
 470         runtime->min_align = frames;
 471
 472         /* Default sw params */
 473         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 474         runtime->period_step = 1;
 475         runtime->control->avail_min = runtime->period_size;
 476         runtime->start_threshold = 1;
 477         runtime->stop_threshold = runtime->buffer_size;
 478         runtime->silence_threshold = 0;
 479         runtime->silence_size = 0;
 480         err = calc_boundary(runtime);
 481         if (err < 0)
 482                 goto _error;
 483
 484         snd_pcm_timer_resolution_change(substream);
 485         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 486
 487         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 488                                 substream->latency_id);
 489         if ((usecs = period_to_usecs(runtime)) >= 0)
 490                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
 491                                         substream->latency_id, usecs);
 492         return 0;
 493  _error:
 494         /* hardware might be unuseable from this time,
 495            so we force application to retry to set
 496            the correct hardware parameter settings */
 497         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 498         if (substream->ops->hw_free != NULL)
 499                 substream->ops->hw_free(substream);
 500         return err;
 501 }
 502
 503 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 504                                   struct snd_pcm_hw_params __user * _params)
 505 {
 506         struct snd_pcm_hw_params *params;
 507         int err;
 508
 509         params = memdup_user(_params, sizeof(*params));
 510         if (IS_ERR(params))
 511                 return PTR_ERR(params);
 512
 513         err = snd_pcm_hw_params(substream, params);
 514         if (copy_to_user(_params, params, sizeof(*params))) {
 515                 if (!err)
 516                         err = -EFAULT;
 517         }
 518
 519         kfree(params);
 520         return err;
 521 }
 522
 523 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 524 {
 525         struct snd_pcm_runtime *runtime;
 526         int result = 0;
 527
 528         if (PCM_RUNTIME_CHECK(substream))
 529                 return -ENXIO;
 530         runtime = substream->runtime;
 531         snd_pcm_stream_lock_irq(substream);
 532         switch (runtime->status->state) {
 533         case SNDRV_PCM_STATE_SETUP:
 534         case SNDRV_PCM_STATE_PREPARED:
 535                 break;
 536         default:
 537                 snd_pcm_stream_unlock_irq(substream);
 538                 return -EBADFD;
 539         }
 540         snd_pcm_stream_unlock_irq(substream);
 541         if (atomic_read(&substream->mmap_count))
 542                 return -EBADFD;
 543         if (substream->ops->hw_free)
 544                 result = substream->ops->hw_free(substream);
 545         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 546         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 547                 substream->latency_id);
 548         return result;
 549 }
 550
 551 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 552                              struct snd_pcm_sw_params *params)
 553 {
 554         struct snd_pcm_runtime *runtime;
 555         int err;
 556
 557         if (PCM_RUNTIME_CHECK(substream))
 558                 return -ENXIO;
 559         runtime = substream->runtime;
 560         snd_pcm_stream_lock_irq(substream);
 561         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 562                 snd_pcm_stream_unlock_irq(substream);
 563                 return -EBADFD;
 564         }
 565         snd_pcm_stream_unlock_irq(substream);
 566
 567         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 568                 return -EINVAL;
 569         if (params->avail_min == 0)
 570                 return -EINVAL;
 571         if (params->silence_size >= runtime->boundary) {
 572                 if (params->silence_threshold != 0)
 573                         return -EINVAL;
 574         } else {
 575                 if (params->silence_size > params->silence_threshold)
 576                         return -EINVAL;
 577                 if (params->silence_threshold > runtime->buffer_size)
 578                         return -EINVAL;
 579         }
 580         err = 0;
 581         snd_pcm_stream_lock_irq(substream);
 582         runtime->tstamp_mode = params->tstamp_mode;
 583         runtime->period_step = params->period_step;
 584         runtime->control->avail_min = params->avail_min;
 585         runtime->start_threshold = params->start_threshold;
 586         runtime->stop_threshold = params->stop_threshold;
 587         runtime->silence_threshold = params->silence_threshold;
 588         runtime->silence_size = params->silence_size;
 589         params->boundary = runtime->boundary;
 590         if (snd_pcm_running(substream)) {
 591                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 592                     runtime->silence_size > 0)
 593                         snd_pcm_playback_silence(substream, ULONG_MAX);
 594                 err = snd_pcm_update_state(substream, runtime);
 595         }
 596         snd_pcm_stream_unlock_irq(substream);
 597         return err;
 598 }
 599
 600 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 601                                   struct snd_pcm_sw_params __user * _params)
 602 {
 603         struct snd_pcm_sw_params params;
 604         int err;
 605         if (copy_from_user(&params, _params, sizeof(params)))
 606                 return -EFAULT;
 607         err = snd_pcm_sw_params(substream, &params);
 608         if (copy_to_user(_params, &params, sizeof(params)))
 609                 return -EFAULT;
 610         return err;
 611 }
 612
 613 int snd_pcm_status(struct snd_pcm_substream *substream,
 614                    struct snd_pcm_status *status)
 615 {
 616         struct snd_pcm_runtime *runtime = substream->runtime;
 617
 618         snd_pcm_stream_lock_irq(substream);
 619         status->state = runtime->status->state;
 620         status->suspended_state = runtime->status->suspended_state;
 621         if (status->state == SNDRV_PCM_STATE_OPEN)
 622                 goto _end;
 623         status->trigger_tstamp = runtime->trigger_tstamp;
 624         if (snd_pcm_running(substream)) {
 625                 snd_pcm_update_hw_ptr(substream);
 626                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 627                         status->tstamp = runtime->status->tstamp;
 628                         goto _tstamp_end;
 629                 }
 630         }
 631         snd_pcm_gettime(runtime, &status->tstamp);
 632  _tstamp_end:
 633         status->appl_ptr = runtime->control->appl_ptr;
 634         status->hw_ptr = runtime->status->hw_ptr;
 635         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 636                 status->avail = snd_pcm_playback_avail(runtime);
 637                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 638                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 639                         status->delay = runtime->buffer_size - status->avail;
 640                         status->delay += runtime->delay;
 641                 } else
 642                         status->delay = 0;
 643         } else {
 644                 status->avail = snd_pcm_capture_avail(runtime);
 645                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 646                         status->delay = status->avail + runtime->delay;
 647                 else
 648                         status->delay = 0;
 649         }
 650         status->avail_max = runtime->avail_max;
 651         status->overrange = runtime->overrange;
 652         runtime->avail_max = 0;
 653         runtime->overrange = 0;
 654  _end:
 655         snd_pcm_stream_unlock_irq(substream);
 656         return 0;
 657 }
 658
 659 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 660                                struct snd_pcm_status __user * _status)
 661 {
 662         struct snd_pcm_status status;
 663         int res;
 664
 665         memset(&status, 0, sizeof(status));
 666         res = snd_pcm_status(substream, &status);
 667         if (res < 0)
 668                 return res;
 669         if (copy_to_user(_status, &status, sizeof(status)))
 670                 return -EFAULT;
 671         return 0;
 672 }
 673
 674 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 675                                 struct snd_pcm_channel_info * info)
 676 {
 677         struct snd_pcm_runtime *runtime;
 678         unsigned int channel;
 679
 680         channel = info->channel;
 681         runtime = substream->runtime;
 682         snd_pcm_stream_lock_irq(substream);
 683         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 684                 snd_pcm_stream_unlock_irq(substream);
 685                 return -EBADFD;
 686         }
 687         snd_pcm_stream_unlock_irq(substream);
 688         if (channel >= runtime->channels)
 689                 return -EINVAL;
 690         memset(info, 0, sizeof(*info));
 691         info->channel = channel;
 692         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 693 }
 694
 695 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 696                                      struct snd_pcm_channel_info __user * _info)
 697 {
 698         struct snd_pcm_channel_info info;
 699         int res;
 700
 701         if (copy_from_user(&info, _info, sizeof(info)))
 702                 return -EFAULT;
 703         res = snd_pcm_channel_info(substream, &info);
 704         if (res < 0)
 705                 return res;
 706         if (copy_to_user(_info, &info, sizeof(info)))
 707                 return -EFAULT;
 708         return 0;
 709 }
 710
 711 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 712 {
 713         struct snd_pcm_runtime *runtime = substream->runtime;
 714         if (runtime->trigger_master == NULL)
 715                 return;
 716         if (runtime->trigger_master == substream) {
 717                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 718         } else {
 719                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 720                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 721         }
 722         runtime->trigger_master = NULL;
 723 }
 724
 725 struct action_ops {
 726         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 727         int (*do_action)(struct snd_pcm_substream *substream, int state);
 728         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 729         void (*post_action)(struct snd_pcm_substream *substream, int state);
 730 };
 731
 732 /*
 733  *  this functions is core for handling of linked stream
 734  *  Note: the stream state might be changed also on failure
 735  *  Note2: call with calling stream lock + link lock
 736  */
 737 static int snd_pcm_action_group(struct action_ops *ops,
 738                                 struct snd_pcm_substream *substream,
 739                                 int state, int do_lock)
 740 {
 741         struct snd_pcm_substream *s = NULL;
 742         struct snd_pcm_substream *s1;
 743         int res = 0;
 744
 745         snd_pcm_group_for_each_entry(s, substream) {
 746                 if (do_lock && s != substream)
 747                         spin_lock_nested(&s->self_group.lock,
 748                                          SINGLE_DEPTH_NESTING);
 749                 res = ops->pre_action(s, state);
 750                 if (res < 0)
 751                         goto _unlock;
 752         }
 753         snd_pcm_group_for_each_entry(s, substream) {
 754                 res = ops->do_action(s, state);
 755                 if (res < 0) {
 756                         if (ops->undo_action) {
 757                                 snd_pcm_group_for_each_entry(s1, substream) {
 758                                         if (s1 == s) /* failed stream */
 759                                                 break;
 760                                         ops->undo_action(s1, state);
 761                                 }
 762                         }
 763                         s = NULL; /* unlock all */
 764                         goto _unlock;
 765                 }
 766         }
 767         snd_pcm_group_for_each_entry(s, substream) {
 768                 ops->post_action(s, state);
 769         }
 770  _unlock:
 771         if (do_lock) {
 772                 /* unlock streams */
 773                 snd_pcm_group_for_each_entry(s1, substream) {
 774                         if (s1 != substream)
 775                                 spin_unlock(&s1->self_group.lock);
 776                         if (s1 == s)    /* end */
 777                                 break;
 778                 }
 779         }
 780         return res;
 781 }
 782
 783 /*
 784  *  Note: call with stream lock
 785  */
 786 static int snd_pcm_action_single(struct action_ops *ops,
 787                                  struct snd_pcm_substream *substream,
 788                                  int state)
 789 {
 790         int res;
 791
 792         res = ops->pre_action(substream, state);
 793         if (res < 0)
 794                 return res;
 795         res = ops->do_action(substream, state);
 796         if (res == 0)
 797                 ops->post_action(substream, state);
 798         else if (ops->undo_action)
 799                 ops->undo_action(substream, state);
 800         return res;
 801 }
 802
 803 /*
 804  *  Note: call with stream lock
 805  */
 806 static int snd_pcm_action(struct action_ops *ops,
 807                           struct snd_pcm_substream *substream,
 808                           int state)
 809 {
 810         int res;
 811
 812         if (snd_pcm_stream_linked(substream)) {
 813                 if (!spin_trylock(&substream->group->lock)) {
 814                         spin_unlock(&substream->self_group.lock);
 815                         spin_lock(&substream->group->lock);
 816                         spin_lock(&substream->self_group.lock);
 817                 }
 818                 res = snd_pcm_action_group(ops, substream, state, 1);
 819                 spin_unlock(&substream->group->lock);
 820         } else {
 821                 res = snd_pcm_action_single(ops, substream, state);
 822         }
 823         return res;
 824 }
 825
 826 /*
 827  *  Note: don't use any locks before
 828  */
 829 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 830                                    struct snd_pcm_substream *substream,
 831                                    int state)
 832 {
 833         int res;
 834
 835         read_lock_irq(&snd_pcm_link_rwlock);
 836         if (snd_pcm_stream_linked(substream)) {
 837                 spin_lock(&substream->group->lock);
 838                 spin_lock(&substream->self_group.lock);
 839                 res = snd_pcm_action_group(ops, substream, state, 1);
 840                 spin_unlock(&substream->self_group.lock);
 841                 spin_unlock(&substream->group->lock);
 842         } else {
 843                 spin_lock(&substream->self_group.lock);
 844                 res = snd_pcm_action_single(ops, substream, state);
 845                 spin_unlock(&substream->self_group.lock);
 846         }
 847         read_unlock_irq(&snd_pcm_link_rwlock);
 848         return res;
 849 }
 850
 851 /*
 852  */
 853 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 854                                     struct snd_pcm_substream *substream,
 855                                     int state)
 856 {
 857         int res;
 858
 859         down_read(&snd_pcm_link_rwsem);
 860         if (snd_pcm_stream_linked(substream))
 861                 res = snd_pcm_action_group(ops, substream, state, 0);
 862         else
 863                 res = snd_pcm_action_single(ops, substream, state);
 864         up_read(&snd_pcm_link_rwsem);
 865         return res;
 866 }
 867
 868 /*
 869  * start callbacks
 870  */
 871 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 872 {
 873         struct snd_pcm_runtime *runtime = substream->runtime;
 874         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 875                 return -EBADFD;
 876         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 877             !snd_pcm_playback_data(substream))
 878                 return -EPIPE;
 879         runtime->trigger_master = substream;
 880         return 0;
 881 }
 882
 883 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 884 {
 885         if (substream->runtime->trigger_master != substream)
 886                 return 0;
 887         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 888 }
 889
 890 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 891 {
 892         if (substream->runtime->trigger_master == substream)
 893                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 894 }
 895
 896 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 897 {
 898         struct snd_pcm_runtime *runtime = substream->runtime;
 899         snd_pcm_trigger_tstamp(substream);
 900         runtime->hw_ptr_jiffies = jiffies;
 901         runtime->status->state = state;
 902         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 903             runtime->silence_size > 0)
 904                 snd_pcm_playback_silence(substream, ULONG_MAX);
 905         if (substream->timer)
 906                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 907                                  &runtime->trigger_tstamp);
 908 }
 909
 910 static struct action_ops snd_pcm_action_start = {
 911         .pre_action = snd_pcm_pre_start,
 912         .do_action = snd_pcm_do_start,
 913         .undo_action = snd_pcm_undo_start,
 914         .post_action = snd_pcm_post_start
 915 };
 916
 917 /**
 918  * snd_pcm_start - start all linked streams
 919  * @substream: the PCM substream instance
 920  */
 921 int snd_pcm_start(struct snd_pcm_substream *substream)
 922 {
 923         return snd_pcm_action(&snd_pcm_action_start, substream,
 924                               SNDRV_PCM_STATE_RUNNING);
 925 }
 926
 927 /*
 928  * stop callbacks
 929  */
 930 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 931 {
 932         struct snd_pcm_runtime *runtime = substream->runtime;
 933         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 934                 return -EBADFD;
 935         runtime->trigger_master = substream;
 936         return 0;
 937 }
 938
 939 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 940 {
 941         if (substream->runtime->trigger_master == substream &&
 942             snd_pcm_running(substream))
 943                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 944         return 0; /* unconditonally stop all substreams */
 945 }
 946
 947 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 948 {
 949         struct snd_pcm_runtime *runtime = substream->runtime;
 950         if (runtime->status->state != state) {
 951                 snd_pcm_trigger_tstamp(substream);
 952                 if (substream->timer)
 953                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 954                                          &runtime->trigger_tstamp);
 955                 runtime->status->state = state;
 956         }
 957         wake_up(&runtime->sleep);
 958         wake_up(&runtime->tsleep);
 959 }
 960
 961 static struct action_ops snd_pcm_action_stop = {
 962         .pre_action = snd_pcm_pre_stop,
 963         .do_action = snd_pcm_do_stop,
 964         .post_action = snd_pcm_post_stop
 965 };
 966
 967 /**
 968  * snd_pcm_stop - try to stop all running streams in the substream group
 969  * @substream: the PCM substream instance
 970  * @state: PCM state after stopping the stream
 971  *
 972  * The state of each stream is then changed to the given state unconditionally.
 973  */
 974 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 975 {
 976         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 977 }
 978
 979 EXPORT_SYMBOL(snd_pcm_stop);
 980
 981 /**
 982  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 983  * @substream: the PCM substream
 984  *
 985  * After stopping, the state is changed to SETUP.
 986  * Unlike snd_pcm_stop(), this affects only the given stream.
 987  */
 988 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 989 {
 990         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 991                                      SNDRV_PCM_STATE_SETUP);
 992 }
 993
 994 /*
 995  * pause callbacks
 996  */
 997 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 998 {
 999         struct snd_pcm_runtime *runtime = substream->runtime;
1000         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1001                 return -ENOSYS;
1002         if (push) {
1003                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1004                         return -EBADFD;
1005         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1006                 return -EBADFD;
1007         runtime->trigger_master = substream;
1008         return 0;
1009 }
1010
1011 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1012 {
1013         if (substream->runtime->trigger_master != substream)
1014                 return 0;
1015         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1016          * a delta betwen the current jiffies, this gives a large enough
1017          * delta, effectively to skip the check once.
1018          */
1019         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1020         return substream->ops->trigger(substream,
1021                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1022                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1023 }
1024
1025 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1026 {
1027         if (substream->runtime->trigger_master == substream)
1028                 substream->ops->trigger(substream,
1029                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1030                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1031 }
1032
1033 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1034 {
1035         struct snd_pcm_runtime *runtime = substream->runtime;
1036         snd_pcm_trigger_tstamp(substream);
1037         if (push) {
1038                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1039                 if (substream->timer)
1040                         snd_timer_notify(substream->timer,
1041                                          SNDRV_TIMER_EVENT_MPAUSE,
1042                                          &runtime->trigger_tstamp);
1043                 wake_up(&runtime->sleep);
1044                 wake_up(&runtime->tsleep);
1045         } else {
1046                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1047                 if (substream->timer)
1048                         snd_timer_notify(substream->timer,
1049                                          SNDRV_TIMER_EVENT_MCONTINUE,
1050                                          &runtime->trigger_tstamp);
1051         }
1052 }
1053
1054 static struct action_ops snd_pcm_action_pause = {
1055         .pre_action = snd_pcm_pre_pause,
1056         .do_action = snd_pcm_do_pause,
1057         .undo_action = snd_pcm_undo_pause,
1058         .post_action = snd_pcm_post_pause
1059 };
1060
1061 /*
1062  * Push/release the pause for all linked streams.
1063  */
1064 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1065 {
1066         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1067 }
1068
1069 #ifdef CONFIG_PM
1070 /* suspend */
1071
1072 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1073 {
1074         struct snd_pcm_runtime *runtime = substream->runtime;
1075         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1076                 return -EBUSY;
1077         runtime->trigger_master = substream;
1078         return 0;
1079 }
1080
1081 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1082 {
1083         struct snd_pcm_runtime *runtime = substream->runtime;
1084         if (runtime->trigger_master != substream)
1085                 return 0;
1086         if (! snd_pcm_running(substream))
1087                 return 0;
1088         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1089         return 0; /* suspend unconditionally */
1090 }
1091
1092 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1093 {
1094         struct snd_pcm_runtime *runtime = substream->runtime;
1095         snd_pcm_trigger_tstamp(substream);
1096         if (substream->timer)
1097                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1098                                  &runtime->trigger_tstamp);
1099         runtime->status->suspended_state = runtime->status->state;
1100         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1101         wake_up(&runtime->sleep);
1102         wake_up(&runtime->tsleep);
1103 }
1104
1105 static struct action_ops snd_pcm_action_suspend = {
1106         .pre_action = snd_pcm_pre_suspend,
1107         .do_action = snd_pcm_do_suspend,
1108         .post_action = snd_pcm_post_suspend
1109 };
1110
1111 /**
1112  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1113  * @substream: the PCM substream
1114  *
1115  * After this call, all streams are changed to SUSPENDED state.
1116  */
1117 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1118 {
1119         int err;
1120         unsigned long flags;
1121
1122         if (! substream)
1123                 return 0;
1124
1125         snd_pcm_stream_lock_irqsave(substream, flags);
1126         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1127         snd_pcm_stream_unlock_irqrestore(substream, flags);
1128         return err;
1129 }
1130
1131 EXPORT_SYMBOL(snd_pcm_suspend);
1132
1133 /**
1134  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1135  * @pcm: the PCM instance
1136  *
1137  * After this call, all streams are changed to SUSPENDED state.
1138  */
1139 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1140 {
1141         struct snd_pcm_substream *substream;
1142         int stream, err = 0;
1143
1144         if (! pcm)
1145                 return 0;
1146
1147         for (stream = 0; stream < 2; stream++) {
1148                 for (substream = pcm->streams[stream].substream;
1149                      substream; substream = substream->next) {
1150                         /* FIXME: the open/close code should lock this as well */
1151                         if (substream->runtime == NULL)
1152                                 continue;
1153                         err = snd_pcm_suspend(substream);
1154                         if (err < 0 && err != -EBUSY)
1155                                 return err;
1156                 }
1157         }
1158         return 0;
1159 }
1160
1161 EXPORT_SYMBOL(snd_pcm_suspend_all);
1162
1163 /* resume */
1164
1165 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1166 {
1167         struct snd_pcm_runtime *runtime = substream->runtime;
1168         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1169                 return -ENOSYS;
1170         runtime->trigger_master = substream;
1171         return 0;
1172 }
1173
1174 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1175 {
1176         struct snd_pcm_runtime *runtime = substream->runtime;
1177         if (runtime->trigger_master != substream)
1178                 return 0;
1179         /* DMA not running previously? */
1180         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1181             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1182              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1183                 return 0;
1184         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1185 }
1186
1187 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1188 {
1189         if (substream->runtime->trigger_master == substream &&
1190             snd_pcm_running(substream))
1191                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1192 }
1193
1194 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1195 {
1196         struct snd_pcm_runtime *runtime = substream->runtime;
1197         snd_pcm_trigger_tstamp(substream);
1198         if (substream->timer)
1199                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1200                                  &runtime->trigger_tstamp);
1201         runtime->status->state = runtime->status->suspended_state;
1202 }
1203
1204 static struct action_ops snd_pcm_action_resume = {
1205         .pre_action = snd_pcm_pre_resume,
1206         .do_action = snd_pcm_do_resume,
1207         .undo_action = snd_pcm_undo_resume,
1208         .post_action = snd_pcm_post_resume
1209 };
1210
1211 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1212 {
1213         struct snd_card *card = substream->pcm->card;
1214         int res;
1215
1216         snd_power_lock(card);
1217         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1218                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1219         snd_power_unlock(card);
1220         return res;
1221 }
1222
1223 #else
1224
1225 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1226 {
1227         return -ENOSYS;
1228 }
1229
1230 #endif /* CONFIG_PM */
1231
1232 /*
1233  * xrun ioctl
1234  *
1235  * Change the RUNNING stream(s) to XRUN state.
1236  */
1237 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1238 {
1239         struct snd_card *card = substream->pcm->card;
1240         struct snd_pcm_runtime *runtime = substream->runtime;
1241         int result;
1242
1243         snd_power_lock(card);
1244         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1245                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1246                 if (result < 0)
1247                         goto _unlock;
1248         }
1249
1250         snd_pcm_stream_lock_irq(substream);
1251         switch (runtime->status->state) {
1252         case SNDRV_PCM_STATE_XRUN:
1253                 result = 0;     /* already there */
1254                 break;
1255         case SNDRV_PCM_STATE_RUNNING:
1256                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1257                 break;
1258         default:
1259                 result = -EBADFD;
1260         }
1261         snd_pcm_stream_unlock_irq(substream);
1262  _unlock:
1263         snd_power_unlock(card);
1264         return result;
1265 }
1266
1267 /*
1268  * reset ioctl
1269  */
1270 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1271 {
1272         struct snd_pcm_runtime *runtime = substream->runtime;
1273         switch (runtime->status->state) {
1274         case SNDRV_PCM_STATE_RUNNING:
1275         case SNDRV_PCM_STATE_PREPARED:
1276         case SNDRV_PCM_STATE_PAUSED:
1277         case SNDRV_PCM_STATE_SUSPENDED:
1278                 return 0;
1279         default:
1280                 return -EBADFD;
1281         }
1282 }
1283
1284 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1285 {
1286         struct snd_pcm_runtime *runtime = substream->runtime;
1287         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1288         if (err < 0)
1289                 return err;
1290         runtime->hw_ptr_base = 0;
1291         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1292                 runtime->status->hw_ptr % runtime->period_size;
1293         runtime->silence_start = runtime->status->hw_ptr;
1294         runtime->silence_filled = 0;
1295         return 0;
1296 }
1297
1298 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1299 {
1300         struct snd_pcm_runtime *runtime = substream->runtime;
1301         runtime->control->appl_ptr = runtime->status->hw_ptr;
1302         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1303             runtime->silence_size > 0)
1304                 snd_pcm_playback_silence(substream, ULONG_MAX);
1305 }
1306
1307 static struct action_ops snd_pcm_action_reset = {
1308         .pre_action = snd_pcm_pre_reset,
1309         .do_action = snd_pcm_do_reset,
1310         .post_action = snd_pcm_post_reset
1311 };
1312
1313 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1314 {
1315         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1316 }
1317
1318 /*
1319  * prepare ioctl
1320  */
1321 /* we use the second argument for updating f_flags */
1322 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1323                                int f_flags)
1324 {
1325         struct snd_pcm_runtime *runtime = substream->runtime;
1326         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1327             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1328                 return -EBADFD;
1329         if (snd_pcm_running(substream))
1330                 return -EBUSY;
1331         substream->f_flags = f_flags;
1332         return 0;
1333 }
1334
1335 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1336 {
1337         int err;
1338         err = substream->ops->prepare(substream);
1339         if (err < 0)
1340                 return err;
1341         return snd_pcm_do_reset(substream, 0);
1342 }
1343
1344 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1345 {
1346         struct snd_pcm_runtime *runtime = substream->runtime;
1347         runtime->control->appl_ptr = runtime->status->hw_ptr;
1348         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1349 }
1350
1351 static struct action_ops snd_pcm_action_prepare = {
1352         .pre_action = snd_pcm_pre_prepare,
1353         .do_action = snd_pcm_do_prepare,
1354         .post_action = snd_pcm_post_prepare
1355 };
1356
1357 /**
1358  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1359  * @substream: the PCM substream instance
1360  * @file: file to refer f_flags
1361  */
1362 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1363                            struct file *file)
1364 {
1365         int res;
1366         struct snd_card *card = substream->pcm->card;
1367         int f_flags;
1368
1369         if (file)
1370                 f_flags = file->f_flags;
1371         else
1372                 f_flags = substream->f_flags;
1373
1374         snd_power_lock(card);
1375         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1376                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1377                                                substream, f_flags);
1378         snd_power_unlock(card);
1379         return res;
1380 }
1381
1382 /*
1383  * drain ioctl
1384  */
1385
1386 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1387 {
1388         substream->runtime->trigger_master = substream;
1389         return 0;
1390 }
1391
1392 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1393 {
1394         struct snd_pcm_runtime *runtime = substream->runtime;
1395         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1396                 switch (runtime->status->state) {
1397                 case SNDRV_PCM_STATE_PREPARED:
1398                         /* start playback stream if possible */
1399                         if (! snd_pcm_playback_empty(substream)) {
1400                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1401                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1402                         }
1403                         break;
1404                 case SNDRV_PCM_STATE_RUNNING:
1405                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1406                         break;
1407                 default:
1408                         break;
1409                 }
1410         } else {
1411                 /* stop running stream */
1412                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1413                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1414                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1415                         snd_pcm_do_stop(substream, new_state);
1416                         snd_pcm_post_stop(substream, new_state);
1417                 }
1418         }
1419         return 0;
1420 }
1421
1422 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1423 {
1424 }
1425
1426 static struct action_ops snd_pcm_action_drain_init = {
1427         .pre_action = snd_pcm_pre_drain_init,
1428         .do_action = snd_pcm_do_drain_init,
1429         .post_action = snd_pcm_post_drain_init
1430 };
1431
1432 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1433
1434 /*
1435  * Drain the stream(s).
1436  * When the substream is linked, sync until the draining of all playback streams
1437  * is finished.
1438  * After this call, all streams are supposed to be either SETUP or DRAINING
1439  * (capture only) state.
1440  */
1441 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1442                          struct file *file)
1443 {
1444         struct snd_card *card;
1445         struct snd_pcm_runtime *runtime;
1446         struct snd_pcm_substream *s;
1447         wait_queue_t wait;
1448         int result = 0;
1449         int nonblock = 0;
1450
1451         card = substream->pcm->card;
1452         runtime = substream->runtime;
1453
1454         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1455                 return -EBADFD;
1456
1457         snd_power_lock(card);
1458         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1459                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1460                 if (result < 0) {
1461                         snd_power_unlock(card);
1462                         return result;
1463                 }
1464         }
1465
1466         if (file) {
1467                 if (file->f_flags & O_NONBLOCK)
1468                         nonblock = 1;
1469         } else if (substream->f_flags & O_NONBLOCK)
1470                 nonblock = 1;
1471
1472         down_read(&snd_pcm_link_rwsem);
1473         snd_pcm_stream_lock_irq(substream);
1474         /* resume pause */
1475         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1476                 snd_pcm_pause(substream, 0);
1477
1478         /* pre-start/stop - all running streams are changed to DRAINING state */
1479         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1480         if (result < 0)
1481                 goto unlock;
1482         /* in non-blocking, we don't wait in ioctl but let caller poll */
1483         if (nonblock) {
1484                 result = -EAGAIN;
1485                 goto unlock;
1486         }
1487
1488         for (;;) {
1489                 long tout;
1490                 struct snd_pcm_runtime *to_check;
1491                 if (signal_pending(current)) {
1492                         result = -ERESTARTSYS;
1493                         break;
1494                 }
1495                 /* find a substream to drain */
1496                 to_check = NULL;
1497                 snd_pcm_group_for_each_entry(s, substream) {
1498                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1499                                 continue;
1500                         runtime = s->runtime;
1501                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1502                                 to_check = runtime;
1503                                 break;
1504                         }
1505                 }
1506                 if (!to_check)
1507                         break; /* all drained */
1508                 init_waitqueue_entry(&wait, current);
1509                 add_wait_queue(&to_check->sleep, &wait);
1510                 set_current_state(TASK_INTERRUPTIBLE);
1511                 snd_pcm_stream_unlock_irq(substream);
1512                 up_read(&snd_pcm_link_rwsem);
1513                 snd_power_unlock(card);
1514                 tout = schedule_timeout(10 * HZ);
1515                 snd_power_lock(card);
1516                 down_read(&snd_pcm_link_rwsem);
1517                 snd_pcm_stream_lock_irq(substream);
1518                 remove_wait_queue(&to_check->sleep, &wait);
1519                 if (tout == 0) {
1520                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1521                                 result = -ESTRPIPE;
1522                         else {
1523                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1524                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1525                                 result = -EIO;
1526                         }
1527                         break;
1528                 }
1529         }
1530
1531  unlock:
1532         snd_pcm_stream_unlock_irq(substream);
1533         up_read(&snd_pcm_link_rwsem);
1534         snd_power_unlock(card);
1535
1536         return result;
1537 }
1538
1539 /*
1540  * drop ioctl
1541  *
1542  * Immediately put all linked substreams into SETUP state.
1543  */
1544 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1545 {
1546         struct snd_pcm_runtime *runtime;
1547         struct snd_card *card;
1548         int result = 0;
1549
1550         if (PCM_RUNTIME_CHECK(substream))
1551                 return -ENXIO;
1552         runtime = substream->runtime;
1553         card = substream->pcm->card;
1554
1555         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1556             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1557             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1558                 return -EBADFD;
1559
1560         snd_pcm_stream_lock_irq(substream);
1561         /* resume pause */
1562         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1563                 snd_pcm_pause(substream, 0);
1564
1565         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1566         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1567         snd_pcm_stream_unlock_irq(substream);
1568
1569         return result;
1570 }
1571
1572
1573 /* WARNING: Don't forget to fput back the file */
1574 static struct file *snd_pcm_file_fd(int fd)
1575 {
1576         struct file *file;
1577         struct inode *inode;
1578         unsigned int minor;
1579
1580         file = fget(fd);
1581         if (!file)
1582                 return NULL;
1583         inode = file->f_path.dentry->d_inode;
1584         if (!S_ISCHR(inode->i_mode) ||
1585             imajor(inode) != snd_major) {
1586                 fput(file);
1587                 return NULL;
1588         }
1589         minor = iminor(inode);
1590         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1591             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1592                 fput(file);
1593                 return NULL;
1594         }
1595         return file;
1596 }
1597
1598 /*
1599  * PCM link handling
1600  */
1601 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1602 {
1603         int res = 0;
1604         struct file *file;
1605         struct snd_pcm_file *pcm_file;
1606         struct snd_pcm_substream *substream1;
1607
1608         file = snd_pcm_file_fd(fd);
1609         if (!file)
1610                 return -EBADFD;
1611         pcm_file = file->private_data;
1612         substream1 = pcm_file->substream;
1613         down_write(&snd_pcm_link_rwsem);
1614         write_lock_irq(&snd_pcm_link_rwlock);
1615         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1616             substream->runtime->status->state != substream1->runtime->status->state) {
1617                 res = -EBADFD;
1618                 goto _end;
1619         }
1620         if (snd_pcm_stream_linked(substream1)) {
1621                 res = -EALREADY;
1622                 goto _end;
1623         }
1624         if (!snd_pcm_stream_linked(substream)) {
1625                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1626                 if (substream->group == NULL) {
1627                         res = -ENOMEM;
1628                         goto _end;
1629                 }
1630                 spin_lock_init(&substream->group->lock);
1631                 INIT_LIST_HEAD(&substream->group->substreams);
1632                 list_add_tail(&substream->link_list, &substream->group->substreams);
1633                 substream->group->count = 1;
1634         }
1635         list_add_tail(&substream1->link_list, &substream->group->substreams);
1636         substream->group->count++;
1637         substream1->group = substream->group;
1638  _end:
1639         write_unlock_irq(&snd_pcm_link_rwlock);
1640         up_write(&snd_pcm_link_rwsem);
1641         fput(file);
1642         return res;
1643 }
1644
1645 static void relink_to_local(struct snd_pcm_substream *substream)
1646 {
1647         substream->group = &substream->self_group;
1648         INIT_LIST_HEAD(&substream->self_group.substreams);
1649         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1650 }
1651
1652 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1653 {
1654         struct snd_pcm_substream *s;
1655         int res = 0;
1656
1657         down_write(&snd_pcm_link_rwsem);
1658         write_lock_irq(&snd_pcm_link_rwlock);
1659         if (!snd_pcm_stream_linked(substream)) {
1660                 res = -EALREADY;
1661                 goto _end;
1662         }
1663         list_del(&substream->link_list);
1664         substream->group->count--;
1665         if (substream->group->count == 1) {     /* detach the last stream, too */
1666                 snd_pcm_group_for_each_entry(s, substream) {
1667                         relink_to_local(s);
1668                         break;
1669                 }
1670                 kfree(substream->group);
1671         }
1672         relink_to_local(substream);
1673        _end:
1674         write_unlock_irq(&snd_pcm_link_rwlock);
1675         up_write(&snd_pcm_link_rwsem);
1676         return res;
1677 }
1678
1679 /*
1680  * hw configurator
1681  */
1682 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1683                                struct snd_pcm_hw_rule *rule)
1684 {
1685         struct snd_interval t;
1686         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1687                      hw_param_interval_c(params, rule->deps[1]), &t);
1688         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1689 }
1690
1691 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1692                                struct snd_pcm_hw_rule *rule)
1693 {
1694         struct snd_interval t;
1695         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1696                      hw_param_interval_c(params, rule->deps[1]), &t);
1697         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1698 }
1699
1700 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1701                                    struct snd_pcm_hw_rule *rule)
1702 {
1703         struct snd_interval t;
1704         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1705                          hw_param_interval_c(params, rule->deps[1]),
1706                          (unsigned long) rule->private, &t);
1707         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1708 }
1709
1710 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1711                                    struct snd_pcm_hw_rule *rule)
1712 {
1713         struct snd_interval t;
1714         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1715                          (unsigned long) rule->private,
1716                          hw_param_interval_c(params, rule->deps[1]), &t);
1717         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1718 }
1719
1720 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1721                                   struct snd_pcm_hw_rule *rule)
1722 {
1723         unsigned int k;
1724         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1725         struct snd_mask m;
1726         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1727         snd_mask_any(&m);
1728         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1729                 int bits;
1730                 if (! snd_mask_test(mask, k))
1731                         continue;
1732                 bits = snd_pcm_format_physical_width(k);
1733                 if (bits <= 0)
1734                         continue; /* ignore invalid formats */
1735                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1736                         snd_mask_reset(&m, k);
1737         }
1738         return snd_mask_refine(mask, &m);
1739 }
1740
1741 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1742                                        struct snd_pcm_hw_rule *rule)
1743 {
1744         struct snd_interval t;
1745         unsigned int k;
1746         t.min = UINT_MAX;
1747         t.max = 0;
1748         t.openmin = 0;
1749         t.openmax = 0;
1750         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1751                 int bits;
1752                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1753                         continue;
1754                 bits = snd_pcm_format_physical_width(k);
1755                 if (bits <= 0)
1756                         continue; /* ignore invalid formats */
1757                 if (t.min > (unsigned)bits)
1758                         t.min = bits;
1759                 if (t.max < (unsigned)bits)
1760                         t.max = bits;
1761         }
1762         t.integer = 1;
1763         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1764 }
1765
1766 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1767 #error "Change this table"
1768 #endif
1769
1770 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1771                                  48000, 64000, 88200, 96000, 176400, 192000 };
1772
1773 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1774         .count = ARRAY_SIZE(rates),
1775         .list = rates,
1776 };
1777
1778 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1779                                 struct snd_pcm_hw_rule *rule)
1780 {
1781         struct snd_pcm_hardware *hw = rule->private;
1782         return snd_interval_list(hw_param_interval(params, rule->var),
1783                                  snd_pcm_known_rates.count,
1784                                  snd_pcm_known_rates.list, hw->rates);
1785 }
1786
1787 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1788                                             struct snd_pcm_hw_rule *rule)
1789 {
1790         struct snd_interval t;
1791         struct snd_pcm_substream *substream = rule->private;
1792         t.min = 0;
1793         t.max = substream->buffer_bytes_max;
1794         t.openmin = 0;
1795         t.openmax = 0;
1796         t.integer = 1;
1797         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1798 }
1799
1800 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1801 {
1802         struct snd_pcm_runtime *runtime = substream->runtime;
1803         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1804         int k, err;
1805
1806         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1807                 snd_mask_any(constrs_mask(constrs, k));
1808         }
1809
1810         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1811                 snd_interval_any(constrs_interval(constrs, k));
1812         }
1813
1814         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1815         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1816         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1817         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1818         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1819
1820         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1821                                    snd_pcm_hw_rule_format, NULL,
1822                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1823         if (err < 0)
1824                 return err;
1825         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1826                                   snd_pcm_hw_rule_sample_bits, NULL,
1827                                   SNDRV_PCM_HW_PARAM_FORMAT,
1828                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1829         if (err < 0)
1830                 return err;
1831         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1832                                   snd_pcm_hw_rule_div, NULL,
1833                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1834         if (err < 0)
1835                 return err;
1836         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1837                                   snd_pcm_hw_rule_mul, NULL,
1838                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1839         if (err < 0)
1840                 return err;
1841         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1842                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1843                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1844         if (err < 0)
1845                 return err;
1846         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1847                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1848                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1849         if (err < 0)
1850                 return err;
1851         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1852                                   snd_pcm_hw_rule_div, NULL,
1853                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1854         if (err < 0)
1855                 return err;
1856         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1857                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1858                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1859         if (err < 0)
1860                 return err;
1861         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1862                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1863                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1864         if (err < 0)
1865                 return err;
1866         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1867                                   snd_pcm_hw_rule_div, NULL,
1868                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1869         if (err < 0)
1870                 return err;
1871         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1872                                   snd_pcm_hw_rule_div, NULL,
1873                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1874         if (err < 0)
1875                 return err;
1876         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1877                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1878                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1879         if (err < 0)
1880                 return err;
1881         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1882                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1883                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1884         if (err < 0)
1885                 return err;
1886         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1887                                   snd_pcm_hw_rule_mul, NULL,
1888                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1889         if (err < 0)
1890                 return err;
1891         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1892                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1893                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1894         if (err < 0)
1895                 return err;
1896         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1897                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1898                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1899         if (err < 0)
1900                 return err;
1901         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1902                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1903                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1904         if (err < 0)
1905                 return err;
1906         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1907                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1908                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1909         if (err < 0)
1910                 return err;
1911         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1912                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1913                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1914         if (err < 0)
1915                 return err;
1916         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1917                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1918                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1919         if (err < 0)
1920                 return err;
1921         return 0;
1922 }
1923
1924 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1925 {
1926         struct snd_pcm_runtime *runtime = substream->runtime;
1927         struct snd_pcm_hardware *hw = &runtime->hw;
1928         int err;
1929         unsigned int mask = 0;
1930
1931         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1932                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1933         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1934                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1935         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1936                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1937                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1938                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1939                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1940                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1941                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1942         }
1943         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1944         if (err < 0)
1945                 return err;
1946
1947         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1948         if (err < 0)
1949                 return err;
1950
1951         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1952         if (err < 0)
1953                 return err;
1954
1955         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1956                                            hw->channels_min, hw->channels_max);
1957         if (err < 0)
1958                 return err;
1959
1960         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1961                                            hw->rate_min, hw->rate_max);
1962         if (err < 0)
1963                 return err;
1964
1965         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1966                                            hw->period_bytes_min, hw->period_bytes_max);
1967         if (err < 0)
1968                 return err;
1969
1970         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1971                                            hw->periods_min, hw->periods_max);
1972         if (err < 0)
1973                 return err;
1974
1975         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1976                                            hw->period_bytes_min, hw->buffer_bytes_max);
1977         if (err < 0)
1978                 return err;
1979
1980         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1981                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1982                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1983         if (err < 0)
1984                 return err;
1985
1986         /* FIXME: remove */
1987         if (runtime->dma_bytes) {
1988                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1989                 if (err < 0)
1990                         return -EINVAL;
1991         }
1992
1993         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1994                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1995                                           snd_pcm_hw_rule_rate, hw,
1996                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1997                 if (err < 0)
1998                         return err;
1999         }
2000
2001         /* FIXME: this belong to lowlevel */
2002         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2003
2004         return 0;
2005 }
2006
2007 static void pcm_release_private(struct snd_pcm_substream *substream)
2008 {
2009         snd_pcm_unlink(substream);
2010 }
2011
2012 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2013 {
2014         substream->ref_count--;
2015         if (substream->ref_count > 0)
2016                 return;
2017
2018         snd_pcm_drop(substream);
2019         if (substream->hw_opened) {
2020                 if (substream->ops->hw_free != NULL)
2021                         substream->ops->hw_free(substream);
2022                 substream->ops->close(substream);
2023                 substream->hw_opened = 0;
2024         }
2025         if (substream->pcm_release) {
2026                 substream->pcm_release(substream);
2027                 substream->pcm_release = NULL;
2028         }
2029         snd_pcm_detach_substream(substream);
2030 }
2031
2032 EXPORT_SYMBOL(snd_pcm_release_substream);
2033
2034 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2035                            struct file *file,
2036                            struct snd_pcm_substream **rsubstream)
2037 {
2038         struct snd_pcm_substream *substream;
2039         int err;
2040
2041         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2042         if (err < 0)
2043                 return err;
2044         if (substream->ref_count > 1) {
2045                 *rsubstream = substream;
2046                 return 0;
2047         }
2048
2049         err = snd_pcm_hw_constraints_init(substream);
2050         if (err < 0) {
2051                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2052                 goto error;
2053         }
2054
2055         if ((err = substream->ops->open(substream)) < 0)
2056                 goto error;
2057
2058         substream->hw_opened = 1;
2059
2060         err = snd_pcm_hw_constraints_complete(substream);
2061         if (err < 0) {
2062                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2063                 goto error;
2064         }
2065
2066         *rsubstream = substream;
2067         return 0;
2068
2069  error:
2070         snd_pcm_release_substream(substream);
2071         return err;
2072 }
2073
2074 EXPORT_SYMBOL(snd_pcm_open_substream);
2075
2076 static int snd_pcm_open_file(struct file *file,
2077                              struct snd_pcm *pcm,
2078                              int stream,
2079                              struct snd_pcm_file **rpcm_file)
2080 {
2081         struct snd_pcm_file *pcm_file;
2082         struct snd_pcm_substream *substream;
2083         struct snd_pcm_str *str;
2084         int err;
2085
2086         if (rpcm_file)
2087                 *rpcm_file = NULL;
2088
2089         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2090         if (err < 0)
2091                 return err;
2092
2093         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2094         if (pcm_file == NULL) {
2095                 snd_pcm_release_substream(substream);
2096                 return -ENOMEM;
2097         }
2098         pcm_file->substream = substream;
2099         if (substream->ref_count == 1) {
2100                 str = substream->pstr;
2101                 substream->file = pcm_file;
2102                 substream->pcm_release = pcm_release_private;
2103         }
2104         file->private_data = pcm_file;
2105         if (rpcm_file)
2106                 *rpcm_file = pcm_file;
2107         return 0;
2108 }
2109
2110 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2111 {
2112         struct snd_pcm *pcm;
2113
2114         pcm = snd_lookup_minor_data(iminor(inode),
2115                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2116         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2117 }
2118
2119 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2120 {
2121         struct snd_pcm *pcm;
2122
2123         pcm = snd_lookup_minor_data(iminor(inode),
2124                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2125         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2126 }
2127
2128 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2129 {
2130         int err;
2131         struct snd_pcm_file *pcm_file;
2132         wait_queue_t wait;
2133
2134         if (pcm == NULL) {
2135                 err = -ENODEV;
2136                 goto __error1;
2137         }
2138         err = snd_card_file_add(pcm->card, file);
2139         if (err < 0)
2140                 goto __error1;
2141         if (!try_module_get(pcm->card->module)) {
2142                 err = -EFAULT;
2143                 goto __error2;
2144         }
2145         init_waitqueue_entry(&wait, current);
2146         add_wait_queue(&pcm->open_wait, &wait);
2147         mutex_lock(&pcm->open_mutex);
2148         while (1) {
2149                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2150                 if (err >= 0)
2151                         break;
2152                 if (err == -EAGAIN) {
2153                         if (file->f_flags & O_NONBLOCK) {
2154                                 err = -EBUSY;
2155                                 break;
2156                         }
2157                 } else
2158                         break;
2159                 set_current_state(TASK_INTERRUPTIBLE);
2160                 mutex_unlock(&pcm->open_mutex);
2161                 schedule();
2162                 mutex_lock(&pcm->open_mutex);
2163                 if (signal_pending(current)) {
2164                         err = -ERESTARTSYS;
2165                         break;
2166                 }
2167         }
2168         remove_wait_queue(&pcm->open_wait, &wait);
2169         mutex_unlock(&pcm->open_mutex);
2170         if (err < 0)
2171                 goto __error;
2172         return err;
2173
2174       __error:
2175         module_put(pcm->card->module);
2176       __error2:
2177         snd_card_file_remove(pcm->card, file);
2178       __error1:
2179         return err;
2180 }
2181
2182 static int snd_pcm_release(struct inode *inode, struct file *file)
2183 {
2184         struct snd_pcm *pcm;
2185         struct snd_pcm_substream *substream;
2186         struct snd_pcm_file *pcm_file;
2187
2188         pcm_file = file->private_data;
2189         substream = pcm_file->substream;
2190         if (snd_BUG_ON(!substream))
2191                 return -ENXIO;
2192         pcm = substream->pcm;
2193         mutex_lock(&pcm->open_mutex);
2194         snd_pcm_release_substream(substream);
2195         kfree(pcm_file);
2196         mutex_unlock(&pcm->open_mutex);
2197         wake_up(&pcm->open_wait);
2198         module_put(pcm->card->module);
2199         snd_card_file_remove(pcm->card, file);
2200         return 0;
2201 }
2202
2203 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2204                                                  snd_pcm_uframes_t frames)
2205 {
2206         struct snd_pcm_runtime *runtime = substream->runtime;
2207         snd_pcm_sframes_t appl_ptr;
2208         snd_pcm_sframes_t ret;
2209         snd_pcm_sframes_t hw_avail;
2210
2211         if (frames == 0)
2212                 return 0;
2213
2214         snd_pcm_stream_lock_irq(substream);
2215         switch (runtime->status->state) {
2216         case SNDRV_PCM_STATE_PREPARED:
2217                 break;
2218         case SNDRV_PCM_STATE_DRAINING:
2219         case SNDRV_PCM_STATE_RUNNING:
2220                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2221                         break;
2222                 /* Fall through */
2223         case SNDRV_PCM_STATE_XRUN:
2224                 ret = -EPIPE;
2225                 goto __end;
2226         case SNDRV_PCM_STATE_SUSPENDED:
2227                 ret = -ESTRPIPE;
2228                 goto __end;
2229         default:
2230                 ret = -EBADFD;
2231                 goto __end;
2232         }
2233
2234         hw_avail = snd_pcm_playback_hw_avail(runtime);
2235         if (hw_avail <= 0) {
2236                 ret = 0;
2237                 goto __end;
2238         }
2239         if (frames > (snd_pcm_uframes_t)hw_avail)
2240                 frames = hw_avail;
2241         appl_ptr = runtime->control->appl_ptr - frames;
2242         if (appl_ptr < 0)
2243                 appl_ptr += runtime->boundary;
2244         runtime->control->appl_ptr = appl_ptr;
2245         ret = frames;
2246  __end:
2247         snd_pcm_stream_unlock_irq(substream);
2248         return ret;
2249 }
2250
2251 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2252                                                 snd_pcm_uframes_t frames)
2253 {
2254         struct snd_pcm_runtime *runtime = substream->runtime;
2255         snd_pcm_sframes_t appl_ptr;
2256         snd_pcm_sframes_t ret;
2257         snd_pcm_sframes_t hw_avail;
2258
2259         if (frames == 0)
2260                 return 0;
2261
2262         snd_pcm_stream_lock_irq(substream);
2263         switch (runtime->status->state) {
2264         case SNDRV_PCM_STATE_PREPARED:
2265         case SNDRV_PCM_STATE_DRAINING:
2266                 break;
2267         case SNDRV_PCM_STATE_RUNNING:
2268                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2269                         break;
2270                 /* Fall through */
2271         case SNDRV_PCM_STATE_XRUN:
2272                 ret = -EPIPE;
2273                 goto __end;
2274         case SNDRV_PCM_STATE_SUSPENDED:
2275                 ret = -ESTRPIPE;
2276                 goto __end;
2277         default:
2278                 ret = -EBADFD;
2279                 goto __end;
2280         }
2281
2282         hw_avail = snd_pcm_capture_hw_avail(runtime);
2283         if (hw_avail <= 0) {
2284                 ret = 0;
2285                 goto __end;
2286         }
2287         if (frames > (snd_pcm_uframes_t)hw_avail)
2288                 frames = hw_avail;
2289         appl_ptr = runtime->control->appl_ptr - frames;
2290         if (appl_ptr < 0)
2291                 appl_ptr += runtime->boundary;
2292         runtime->control->appl_ptr = appl_ptr;
2293         ret = frames;
2294  __end:
2295         snd_pcm_stream_unlock_irq(substream);
2296         return ret;
2297 }
2298
2299 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2300                                                   snd_pcm_uframes_t frames)
2301 {
2302         struct snd_pcm_runtime *runtime = substream->runtime;
2303         snd_pcm_sframes_t appl_ptr;
2304         snd_pcm_sframes_t ret;
2305         snd_pcm_sframes_t avail;
2306
2307         if (frames == 0)
2308                 return 0;
2309
2310         snd_pcm_stream_lock_irq(substream);
2311         switch (runtime->status->state) {
2312         case SNDRV_PCM_STATE_PREPARED:
2313         case SNDRV_PCM_STATE_PAUSED:
2314                 break;
2315         case SNDRV_PCM_STATE_DRAINING:
2316         case SNDRV_PCM_STATE_RUNNING:
2317                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2318                         break;
2319                 /* Fall through */
2320         case SNDRV_PCM_STATE_XRUN:
2321                 ret = -EPIPE;
2322                 goto __end;
2323         case SNDRV_PCM_STATE_SUSPENDED:
2324                 ret = -ESTRPIPE;
2325                 goto __end;
2326         default:
2327                 ret = -EBADFD;
2328                 goto __end;
2329         }
2330
2331         avail = snd_pcm_playback_avail(runtime);
2332         if (avail <= 0) {
2333                 ret = 0;
2334                 goto __end;
2335         }
2336         if (frames > (snd_pcm_uframes_t)avail)
2337                 frames = avail;
2338         appl_ptr = runtime->control->appl_ptr + frames;
2339         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2340                 appl_ptr -= runtime->boundary;
2341         runtime->control->appl_ptr = appl_ptr;
2342         ret = frames;
2343  __end:
2344         snd_pcm_stream_unlock_irq(substream);
2345         return ret;
2346 }
2347
2348 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2349                                                  snd_pcm_uframes_t frames)
2350 {
2351         struct snd_pcm_runtime *runtime = substream->runtime;
2352         snd_pcm_sframes_t appl_ptr;
2353         snd_pcm_sframes_t ret;
2354         snd_pcm_sframes_t avail;
2355
2356         if (frames == 0)
2357                 return 0;
2358
2359         snd_pcm_stream_lock_irq(substream);
2360         switch (runtime->status->state) {
2361         case SNDRV_PCM_STATE_PREPARED:
2362         case SNDRV_PCM_STATE_DRAINING:
2363         case SNDRV_PCM_STATE_PAUSED:
2364                 break;
2365         case SNDRV_PCM_STATE_RUNNING:
2366                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2367                         break;
2368                 /* Fall through */
2369         case SNDRV_PCM_STATE_XRUN:
2370                 ret = -EPIPE;
2371                 goto __end;
2372         case SNDRV_PCM_STATE_SUSPENDED:
2373                 ret = -ESTRPIPE;
2374                 goto __end;
2375         default:
2376                 ret = -EBADFD;
2377                 goto __end;
2378         }
2379
2380         avail = snd_pcm_capture_avail(runtime);
2381         if (avail <= 0) {
2382                 ret = 0;
2383                 goto __end;
2384         }
2385         if (frames > (snd_pcm_uframes_t)avail)
2386                 frames = avail;
2387         appl_ptr = runtime->control->appl_ptr + frames;
2388         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2389                 appl_ptr -= runtime->boundary;
2390         runtime->control->appl_ptr = appl_ptr;
2391         ret = frames;
2392  __end:
2393         snd_pcm_stream_unlock_irq(substream);
2394         return ret;
2395 }
2396
2397 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2398 {
2399         struct snd_pcm_runtime *runtime = substream->runtime;
2400         int err;
2401
2402         snd_pcm_stream_lock_irq(substream);
2403         switch (runtime->status->state) {
2404         case SNDRV_PCM_STATE_DRAINING:
2405                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2406                         goto __badfd;
2407         case SNDRV_PCM_STATE_RUNNING:
2408                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2409                         break;
2410                 /* Fall through */
2411         case SNDRV_PCM_STATE_PREPARED:
2412         case SNDRV_PCM_STATE_SUSPENDED:
2413                 err = 0;
2414                 break;
2415         case SNDRV_PCM_STATE_XRUN:
2416                 err = -EPIPE;
2417                 break;
2418         default:
2419               __badfd:
2420                 err = -EBADFD;
2421                 break;
2422         }
2423         snd_pcm_stream_unlock_irq(substream);
2424         return err;
2425 }
2426
2427 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2428                          snd_pcm_sframes_t __user *res)
2429 {
2430         struct snd_pcm_runtime *runtime = substream->runtime;
2431         int err;
2432         snd_pcm_sframes_t n = 0;
2433
2434         snd_pcm_stream_lock_irq(substream);
2435         switch (runtime->status->state) {
2436         case SNDRV_PCM_STATE_DRAINING:
2437                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2438                         goto __badfd;
2439         case SNDRV_PCM_STATE_RUNNING:
2440                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2441                         break;
2442                 /* Fall through */
2443         case SNDRV_PCM_STATE_PREPARED:
2444         case SNDRV_PCM_STATE_SUSPENDED:
2445                 err = 0;
2446                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2447                         n = snd_pcm_playback_hw_avail(runtime);
2448                 else
2449                         n = snd_pcm_capture_avail(runtime);
2450                 n += runtime->delay;
2451                 break;
2452         case SNDRV_PCM_STATE_XRUN:
2453                 err = -EPIPE;
2454                 break;
2455         default:
2456               __badfd:
2457                 err = -EBADFD;
2458                 break;
2459         }
2460         snd_pcm_stream_unlock_irq(substream);
2461         if (!err)
2462                 if (put_user(n, res))
2463                         err = -EFAULT;
2464         return err;
2465 }
2466
2467 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2468                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2469 {
2470         struct snd_pcm_runtime *runtime = substream->runtime;
2471         struct snd_pcm_sync_ptr sync_ptr;
2472         volatile struct snd_pcm_mmap_status *status;
2473         volatile struct snd_pcm_mmap_control *control;
2474         int err;
2475
2476         memset(&sync_ptr, 0, sizeof(sync_ptr));
2477         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2478                 return -EFAULT;
2479         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2480                 return -EFAULT;
2481         status = runtime->status;
2482         control = runtime->control;
2483         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2484                 err = snd_pcm_hwsync(substream);
2485                 if (err < 0)
2486                         return err;
2487         }
2488         snd_pcm_stream_lock_irq(substream);
2489         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2490                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2491         else
2492                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2493         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2494                 control->avail_min = sync_ptr.c.control.avail_min;
2495         else
2496                 sync_ptr.c.control.avail_min = control->avail_min;
2497         sync_ptr.s.status.state = status->state;
2498         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2499         sync_ptr.s.status.tstamp = status->tstamp;
2500         sync_ptr.s.status.suspended_state = status->suspended_state;
2501         snd_pcm_stream_unlock_irq(substream);
2502         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2503                 return -EFAULT;
2504         return 0;
2505 }
2506
2507 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2508 {
2509         struct snd_pcm_runtime *runtime = substream->runtime;
2510         int arg;
2511
2512         if (get_user(arg, _arg))
2513                 return -EFAULT;
2514         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2515                 return -EINVAL;
2516         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2517         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2518                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
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         switch (cmd) {
2527         case SNDRV_PCM_IOCTL_PVERSION:
2528                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2529         case SNDRV_PCM_IOCTL_INFO:
2530                 return snd_pcm_info_user(substream, arg);
2531         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2532                 return 0;
2533         case SNDRV_PCM_IOCTL_TTSTAMP:
2534                 return snd_pcm_tstamp(substream, arg);
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, file);
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         if (snd_BUG_ON(!substream))
2595                 return -ENXIO;
2596         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2597                 return -EINVAL;
2598         switch (cmd) {
2599         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2600         {
2601                 struct snd_xferi xferi;
2602                 struct snd_xferi __user *_xferi = arg;
2603                 struct snd_pcm_runtime *runtime = substream->runtime;
2604                 snd_pcm_sframes_t result;
2605                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2606                         return -EBADFD;
2607                 if (put_user(0, &_xferi->result))
2608                         return -EFAULT;
2609                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2610                         return -EFAULT;
2611                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2612                 __put_user(result, &_xferi->result);
2613                 return result < 0 ? result : 0;
2614         }
2615         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2616         {
2617                 struct snd_xfern xfern;
2618                 struct snd_xfern __user *_xfern = arg;
2619                 struct snd_pcm_runtime *runtime = substream->runtime;
2620                 void __user **bufs;
2621                 snd_pcm_sframes_t result;
2622                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2623                         return -EBADFD;
2624                 if (runtime->channels > 128)
2625                         return -EINVAL;
2626                 if (put_user(0, &_xfern->result))
2627                         return -EFAULT;
2628                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2629                         return -EFAULT;
2630
2631                 bufs = memdup_user(xfern.bufs,
2632                                    sizeof(void *) * runtime->channels);
2633                 if (IS_ERR(bufs))
2634                         return PTR_ERR(bufs);
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         if (snd_BUG_ON(!substream))
2675                 return -ENXIO;
2676         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2677                 return -EINVAL;
2678         switch (cmd) {
2679         case SNDRV_PCM_IOCTL_READI_FRAMES:
2680         {
2681                 struct snd_xferi xferi;
2682                 struct snd_xferi __user *_xferi = arg;
2683                 struct snd_pcm_runtime *runtime = substream->runtime;
2684                 snd_pcm_sframes_t result;
2685                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2686                         return -EBADFD;
2687                 if (put_user(0, &_xferi->result))
2688                         return -EFAULT;
2689                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2690                         return -EFAULT;
2691                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2692                 __put_user(result, &_xferi->result);
2693                 return result < 0 ? result : 0;
2694         }
2695         case SNDRV_PCM_IOCTL_READN_FRAMES:
2696         {
2697                 struct snd_xfern xfern;
2698                 struct snd_xfern __user *_xfern = arg;
2699                 struct snd_pcm_runtime *runtime = substream->runtime;
2700                 void *bufs;
2701                 snd_pcm_sframes_t result;
2702                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2703                         return -EBADFD;
2704                 if (runtime->channels > 128)
2705                         return -EINVAL;
2706                 if (put_user(0, &_xfern->result))
2707                         return -EFAULT;
2708                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2709                         return -EFAULT;
2710
2711                 bufs = memdup_user(xfern.bufs,
2712                                    sizeof(void *) * runtime->channels);
2713                 if (IS_ERR(bufs))
2714                         return PTR_ERR(bufs);
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         if (PCM_RUNTIME_CHECK(substream))
2815                 return -ENXIO;
2816         runtime = substream->runtime;
2817         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2818                 return -EBADFD;
2819         if (!frame_aligned(runtime, count))
2820                 return -EINVAL;
2821         count = bytes_to_frames(runtime, count);
2822         result = snd_pcm_lib_read(substream, buf, count);
2823         if (result > 0)
2824                 result = frames_to_bytes(runtime, result);
2825         return result;
2826 }
2827
2828 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2829                              size_t count, loff_t * offset)
2830 {
2831         struct snd_pcm_file *pcm_file;
2832         struct snd_pcm_substream *substream;
2833         struct snd_pcm_runtime *runtime;
2834         snd_pcm_sframes_t result;
2835
2836         pcm_file = file->private_data;
2837         substream = pcm_file->substream;
2838         if (PCM_RUNTIME_CHECK(substream))
2839                 return -ENXIO;
2840         runtime = substream->runtime;
2841         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2842                 return -EBADFD;
2843         if (!frame_aligned(runtime, count))
2844                 return -EINVAL;
2845         count = bytes_to_frames(runtime, count);
2846         result = snd_pcm_lib_write(substream, buf, count);
2847         if (result > 0)
2848                 result = frames_to_bytes(runtime, result);
2849         return result;
2850 }
2851
2852 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2853                              unsigned long nr_segs, loff_t pos)
2854
2855 {
2856         struct snd_pcm_file *pcm_file;
2857         struct snd_pcm_substream *substream;
2858         struct snd_pcm_runtime *runtime;
2859         snd_pcm_sframes_t result;
2860         unsigned long i;
2861         void __user **bufs;
2862         snd_pcm_uframes_t frames;
2863
2864         pcm_file = iocb->ki_filp->private_data;
2865         substream = pcm_file->substream;
2866         if (PCM_RUNTIME_CHECK(substream))
2867                 return -ENXIO;
2868         runtime = substream->runtime;
2869         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2870                 return -EBADFD;
2871         if (nr_segs > 1024 || nr_segs != runtime->channels)
2872                 return -EINVAL;
2873         if (!frame_aligned(runtime, iov->iov_len))
2874                 return -EINVAL;
2875         frames = bytes_to_samples(runtime, iov->iov_len);
2876         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2877         if (bufs == NULL)
2878                 return -ENOMEM;
2879         for (i = 0; i < nr_segs; ++i)
2880                 bufs[i] = iov[i].iov_base;
2881         result = snd_pcm_lib_readv(substream, bufs, frames);
2882         if (result > 0)
2883                 result = frames_to_bytes(runtime, result);
2884         kfree(bufs);
2885         return result;
2886 }
2887
2888 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2889                               unsigned long nr_segs, loff_t pos)
2890 {
2891         struct snd_pcm_file *pcm_file;
2892         struct snd_pcm_substream *substream;
2893         struct snd_pcm_runtime *runtime;
2894         snd_pcm_sframes_t result;
2895         unsigned long i;
2896         void __user **bufs;
2897         snd_pcm_uframes_t frames;
2898
2899         pcm_file = iocb->ki_filp->private_data;
2900         substream = pcm_file->substream;
2901         if (PCM_RUNTIME_CHECK(substream))
2902                 return -ENXIO;
2903         runtime = substream->runtime;
2904         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2905                 return -EBADFD;
2906         if (nr_segs > 128 || nr_segs != runtime->channels ||
2907             !frame_aligned(runtime, iov->iov_len))
2908                 return -EINVAL;
2909         frames = bytes_to_samples(runtime, iov->iov_len);
2910         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2911         if (bufs == NULL)
2912                 return -ENOMEM;
2913         for (i = 0; i < nr_segs; ++i)
2914                 bufs[i] = iov[i].iov_base;
2915         result = snd_pcm_lib_writev(substream, bufs, frames);
2916         if (result > 0)
2917                 result = frames_to_bytes(runtime, result);
2918         kfree(bufs);
2919         return result;
2920 }
2921
2922 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2923 {
2924         struct snd_pcm_file *pcm_file;
2925         struct snd_pcm_substream *substream;
2926         struct snd_pcm_runtime *runtime;
2927         unsigned int mask;
2928         snd_pcm_uframes_t avail;
2929
2930         pcm_file = file->private_data;
2931
2932         substream = pcm_file->substream;
2933         if (PCM_RUNTIME_CHECK(substream))
2934                 return -ENXIO;
2935         runtime = substream->runtime;
2936
2937         poll_wait(file, &runtime->sleep, wait);
2938
2939         snd_pcm_stream_lock_irq(substream);
2940         avail = snd_pcm_playback_avail(runtime);
2941         switch (runtime->status->state) {
2942         case SNDRV_PCM_STATE_RUNNING:
2943         case SNDRV_PCM_STATE_PREPARED:
2944         case SNDRV_PCM_STATE_PAUSED:
2945                 if (avail >= runtime->control->avail_min) {
2946                         mask = POLLOUT | POLLWRNORM;
2947                         break;
2948                 }
2949                 /* Fall through */
2950         case SNDRV_PCM_STATE_DRAINING:
2951                 mask = 0;
2952                 break;
2953         default:
2954                 mask = POLLOUT | POLLWRNORM | POLLERR;
2955                 break;
2956         }
2957         snd_pcm_stream_unlock_irq(substream);
2958         return mask;
2959 }
2960
2961 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2962 {
2963         struct snd_pcm_file *pcm_file;
2964         struct snd_pcm_substream *substream;
2965         struct snd_pcm_runtime *runtime;
2966         unsigned int mask;
2967         snd_pcm_uframes_t avail;
2968
2969         pcm_file = file->private_data;
2970
2971         substream = pcm_file->substream;
2972         if (PCM_RUNTIME_CHECK(substream))
2973                 return -ENXIO;
2974         runtime = substream->runtime;
2975
2976         poll_wait(file, &runtime->sleep, wait);
2977
2978         snd_pcm_stream_lock_irq(substream);
2979         avail = snd_pcm_capture_avail(runtime);
2980         switch (runtime->status->state) {
2981         case SNDRV_PCM_STATE_RUNNING:
2982         case SNDRV_PCM_STATE_PREPARED:
2983         case SNDRV_PCM_STATE_PAUSED:
2984                 if (avail >= runtime->control->avail_min) {
2985                         mask = POLLIN | POLLRDNORM;
2986                         break;
2987                 }
2988                 mask = 0;
2989                 break;
2990         case SNDRV_PCM_STATE_DRAINING:
2991                 if (avail > 0) {
2992                         mask = POLLIN | POLLRDNORM;
2993                         break;
2994                 }
2995                 /* Fall through */
2996         default:
2997                 mask = POLLIN | POLLRDNORM | POLLERR;
2998                 break;
2999         }
3000         snd_pcm_stream_unlock_irq(substream);
3001         return mask;
3002 }
3003
3004 /*
3005  * mmap support
3006  */
3007
3008 /*
3009  * Only on coherent architectures, we can mmap the status and the control records
3010  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3011  */
3012 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3013 /*
3014  * mmap status record
3015  */
3016 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3017                                                 struct vm_fault *vmf)
3018 {
3019         struct snd_pcm_substream *substream = area->vm_private_data;
3020         struct snd_pcm_runtime *runtime;
3021
3022         if (substream == NULL)
3023                 return VM_FAULT_SIGBUS;
3024         runtime = substream->runtime;
3025         vmf->page = virt_to_page(runtime->status);
3026         get_page(vmf->page);
3027         return 0;
3028 }
3029
3030 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3031 {
3032         .fault =        snd_pcm_mmap_status_fault,
3033 };
3034
3035 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3036                                struct vm_area_struct *area)
3037 {
3038         struct snd_pcm_runtime *runtime;
3039         long size;
3040         if (!(area->vm_flags & VM_READ))
3041                 return -EINVAL;
3042         runtime = substream->runtime;
3043         size = area->vm_end - area->vm_start;
3044         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3045                 return -EINVAL;
3046         area->vm_ops = &snd_pcm_vm_ops_status;
3047         area->vm_private_data = substream;
3048         area->vm_flags |= VM_RESERVED;
3049         return 0;
3050 }
3051
3052 /*
3053  * mmap control record
3054  */
3055 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3056                                                 struct vm_fault *vmf)
3057 {
3058         struct snd_pcm_substream *substream = area->vm_private_data;
3059         struct snd_pcm_runtime *runtime;
3060
3061         if (substream == NULL)
3062                 return VM_FAULT_SIGBUS;
3063         runtime = substream->runtime;
3064         vmf->page = virt_to_page(runtime->control);
3065         get_page(vmf->page);
3066         return 0;
3067 }
3068
3069 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3070 {
3071         .fault =        snd_pcm_mmap_control_fault,
3072 };
3073
3074 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3075                                 struct vm_area_struct *area)
3076 {
3077         struct snd_pcm_runtime *runtime;
3078         long size;
3079         if (!(area->vm_flags & VM_READ))
3080                 return -EINVAL;
3081         runtime = substream->runtime;
3082         size = area->vm_end - area->vm_start;
3083         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3084                 return -EINVAL;
3085         area->vm_ops = &snd_pcm_vm_ops_control;
3086         area->vm_private_data = substream;
3087         area->vm_flags |= VM_RESERVED;
3088         return 0;
3089 }
3090 #else /* ! coherent mmap */
3091 /*
3092  * don't support mmap for status and control records.
3093  */
3094 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3095                                struct vm_area_struct *area)
3096 {
3097         return -ENXIO;
3098 }
3099 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3100                                 struct vm_area_struct *area)
3101 {
3102         return -ENXIO;
3103 }
3104 #endif /* coherent mmap */
3105
3106 static inline struct page *
3107 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3108 {
3109         void *vaddr = substream->runtime->dma_area + ofs;
3110 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3111         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3112                 return virt_to_page(CAC_ADDR(vaddr));
3113 #endif
3114 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3115         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3116                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3117                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3118                 /* assume dma_handle set via pfn_to_phys() in
3119                  * mm/dma-noncoherent.c
3120                  */
3121                 return pfn_to_page(addr >> PAGE_SHIFT);
3122         }
3123 #endif
3124         return virt_to_page(vaddr);
3125 }
3126
3127 /*
3128  * fault callback for mmapping a RAM page
3129  */
3130 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3131                                                 struct vm_fault *vmf)
3132 {
3133         struct snd_pcm_substream *substream = area->vm_private_data;
3134         struct snd_pcm_runtime *runtime;
3135         unsigned long offset;
3136         struct page * page;
3137         size_t dma_bytes;
3138
3139         if (substream == NULL)
3140                 return VM_FAULT_SIGBUS;
3141         runtime = substream->runtime;
3142         offset = vmf->pgoff << PAGE_SHIFT;
3143         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3144         if (offset > dma_bytes - PAGE_SIZE)
3145                 return VM_FAULT_SIGBUS;
3146         if (substream->ops->page)
3147                 page = substream->ops->page(substream, offset);
3148         else
3149                 page = snd_pcm_default_page_ops(substream, offset);
3150         if (!page)
3151                 return VM_FAULT_SIGBUS;
3152         get_page(page);
3153         vmf->page = page;
3154         return 0;
3155 }
3156
3157 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3158         .open =         snd_pcm_mmap_data_open,
3159         .close =        snd_pcm_mmap_data_close,
3160 };
3161
3162 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3163         .open =         snd_pcm_mmap_data_open,
3164         .close =        snd_pcm_mmap_data_close,
3165         .fault =        snd_pcm_mmap_data_fault,
3166 };
3167
3168 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3169 /* This should be defined / handled globally! */
3170 #ifdef CONFIG_ARM
3171 #define ARCH_HAS_DMA_MMAP_COHERENT
3172 #endif
3173 #endif
3174
3175 /*
3176  * mmap the DMA buffer on RAM
3177  */
3178 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3179                                 struct vm_area_struct *area)
3180 {
3181         area->vm_flags |= VM_RESERVED;
3182 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3183         if (!substream->ops->page &&
3184             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3185                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3186                                          area,
3187                                          substream->runtime->dma_area,
3188                                          substream->runtime->dma_addr,
3189                                          area->vm_end - area->vm_start);
3190 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3191         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3192             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3193                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3194 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3195         /* mmap with fault handler */
3196         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3197         return 0;
3198 }
3199
3200 /*
3201  * mmap the DMA buffer on I/O memory area
3202  */
3203 #if SNDRV_PCM_INFO_MMAP_IOMEM
3204 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3205                            struct vm_area_struct *area)
3206 {
3207         long size;
3208         unsigned long offset;
3209
3210         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3211         area->vm_flags |= VM_IO;
3212         size = area->vm_end - area->vm_start;
3213         offset = area->vm_pgoff << PAGE_SHIFT;
3214         if (io_remap_pfn_range(area, area->vm_start,
3215                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3216                                 size, area->vm_page_prot))
3217                 return -EAGAIN;
3218         return 0;
3219 }
3220
3221 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3222 #endif /* SNDRV_PCM_INFO_MMAP */
3223
3224 /* mmap callback with pgprot_noncached */
3225 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3226                                struct vm_area_struct *area)
3227 {
3228         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3229         return snd_pcm_default_mmap(substream, area);
3230 }
3231 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3232
3233 /*
3234  * mmap DMA buffer
3235  */
3236 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3237                       struct vm_area_struct *area)
3238 {
3239         struct snd_pcm_runtime *runtime;
3240         long size;
3241         unsigned long offset;
3242         size_t dma_bytes;
3243         int err;
3244
3245         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3246                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3247                         return -EINVAL;
3248         } else {
3249                 if (!(area->vm_flags & VM_READ))
3250                         return -EINVAL;
3251         }
3252         runtime = substream->runtime;
3253         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3254                 return -EBADFD;
3255         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3256                 return -ENXIO;
3257         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3258             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3259                 return -EINVAL;
3260         size = area->vm_end - area->vm_start;
3261         offset = area->vm_pgoff << PAGE_SHIFT;
3262         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3263         if ((size_t)size > dma_bytes)
3264                 return -EINVAL;
3265         if (offset > dma_bytes - size)
3266                 return -EINVAL;
3267
3268         area->vm_ops = &snd_pcm_vm_ops_data;
3269         area->vm_private_data = substream;
3270         if (substream->ops->mmap)
3271                 err = substream->ops->mmap(substream, area);
3272         else
3273                 err = snd_pcm_default_mmap(substream, area);
3274         if (!err)
3275                 atomic_inc(&substream->mmap_count);
3276         return err;
3277 }
3278
3279 EXPORT_SYMBOL(snd_pcm_mmap_data);
3280
3281 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3282 {
3283         struct snd_pcm_file * pcm_file;
3284         struct snd_pcm_substream *substream;
3285         unsigned long offset;
3286
3287         pcm_file = file->private_data;
3288         substream = pcm_file->substream;
3289         if (PCM_RUNTIME_CHECK(substream))
3290                 return -ENXIO;
3291
3292         offset = area->vm_pgoff << PAGE_SHIFT;
3293         switch (offset) {
3294         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3295                 if (pcm_file->no_compat_mmap)
3296                         return -ENXIO;
3297                 return snd_pcm_mmap_status(substream, file, area);
3298         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3299                 if (pcm_file->no_compat_mmap)
3300                         return -ENXIO;
3301                 return snd_pcm_mmap_control(substream, file, area);
3302         default:
3303                 return snd_pcm_mmap_data(substream, file, area);
3304         }
3305         return 0;
3306 }
3307
3308 static int snd_pcm_fasync(int fd, struct file * file, int on)
3309 {
3310         struct snd_pcm_file * pcm_file;
3311         struct snd_pcm_substream *substream;
3312         struct snd_pcm_runtime *runtime;
3313         int err = -ENXIO;
3314
3315         lock_kernel();
3316         pcm_file = file->private_data;
3317         substream = pcm_file->substream;
3318         if (PCM_RUNTIME_CHECK(substream))
3319                 goto out;
3320         runtime = substream->runtime;
3321         err = fasync_helper(fd, file, on, &runtime->fasync);
3322 out:
3323         unlock_kernel();
3324         return err;
3325 }
3326
3327 /*
3328  * ioctl32 compat
3329  */
3330 #ifdef CONFIG_COMPAT
3331 #include "pcm_compat.c"
3332 #else
3333 #define snd_pcm_ioctl_compat    NULL
3334 #endif
3335
3336 /*
3337  *  To be removed helpers to keep binary compatibility
3338  */
3339
3340 #ifdef CONFIG_SND_SUPPORT_OLD_API
3341 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3342 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3343
3344 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3345                                                struct snd_pcm_hw_params_old *oparams)
3346 {
3347         unsigned int i;
3348
3349         memset(params, 0, sizeof(*params));
3350         params->flags = oparams->flags;
3351         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3352                 params->masks[i].bits[0] = oparams->masks[i];
3353         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3354         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3355         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3356         params->info = oparams->info;
3357         params->msbits = oparams->msbits;
3358         params->rate_num = oparams->rate_num;
3359         params->rate_den = oparams->rate_den;
3360         params->fifo_size = oparams->fifo_size;
3361 }
3362
3363 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3364                                              struct snd_pcm_hw_params *params)
3365 {
3366         unsigned int i;
3367
3368         memset(oparams, 0, sizeof(*oparams));
3369         oparams->flags = params->flags;
3370         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3371                 oparams->masks[i] = params->masks[i].bits[0];
3372         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3373         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3374         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3375         oparams->info = params->info;
3376         oparams->msbits = params->msbits;
3377         oparams->rate_num = params->rate_num;
3378         oparams->rate_den = params->rate_den;
3379         oparams->fifo_size = params->fifo_size;
3380 }
3381
3382 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3383                                       struct snd_pcm_hw_params_old __user * _oparams)
3384 {
3385         struct snd_pcm_hw_params *params;
3386         struct snd_pcm_hw_params_old *oparams = NULL;
3387         int err;
3388
3389         params = kmalloc(sizeof(*params), GFP_KERNEL);
3390         if (!params)
3391                 return -ENOMEM;
3392
3393         oparams = memdup_user(_oparams, sizeof(*oparams));
3394         if (IS_ERR(oparams)) {
3395                 err = PTR_ERR(oparams);
3396                 goto out;
3397         }
3398         snd_pcm_hw_convert_from_old_params(params, oparams);
3399         err = snd_pcm_hw_refine(substream, params);
3400         snd_pcm_hw_convert_to_old_params(oparams, params);
3401         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3402                 if (!err)
3403                         err = -EFAULT;
3404         }
3405
3406         kfree(oparams);
3407 out:
3408         kfree(params);
3409         return err;
3410 }
3411
3412 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3413                                       struct snd_pcm_hw_params_old __user * _oparams)
3414 {
3415         struct snd_pcm_hw_params *params;
3416         struct snd_pcm_hw_params_old *oparams = NULL;
3417         int err;
3418
3419         params = kmalloc(sizeof(*params), GFP_KERNEL);
3420         if (!params)
3421                 return -ENOMEM;
3422
3423         oparams = memdup_user(_oparams, sizeof(*oparams));
3424         if (IS_ERR(oparams)) {
3425                 err = PTR_ERR(oparams);
3426                 goto out;
3427         }
3428         snd_pcm_hw_convert_from_old_params(params, oparams);
3429         err = snd_pcm_hw_params(substream, params);
3430         snd_pcm_hw_convert_to_old_params(oparams, params);
3431         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3432                 if (!err)
3433                         err = -EFAULT;
3434         }
3435
3436         kfree(oparams);
3437 out:
3438         kfree(params);
3439         return err;
3440 }
3441 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3442
3443 #ifndef CONFIG_MMU
3444 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3445                                       unsigned long len, unsigned long pgoff,
3446                                       unsigned long flags)
3447 {
3448         return 0;
3449 }
3450 #else
3451 # define dummy_get_unmapped_area NULL
3452 #endif
3453
3454 /*
3455  *  Register section
3456  */
3457
3458 const struct file_operations snd_pcm_f_ops[2] = {
3459         {
3460                 .owner =                THIS_MODULE,
3461                 .write =                snd_pcm_write,
3462                 .aio_write =            snd_pcm_aio_write,
3463                 .open =                 snd_pcm_playback_open,
3464                 .release =              snd_pcm_release,
3465                 .poll =                 snd_pcm_playback_poll,
3466                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3467                 .compat_ioctl =         snd_pcm_ioctl_compat,
3468                 .mmap =                 snd_pcm_mmap,
3469                 .fasync =               snd_pcm_fasync,
3470                 .get_unmapped_area =    dummy_get_unmapped_area,
3471         },
3472         {
3473                 .owner =                THIS_MODULE,
3474                 .read =                 snd_pcm_read,
3475                 .aio_read =             snd_pcm_aio_read,
3476                 .open =                 snd_pcm_capture_open,
3477                 .release =              snd_pcm_release,
3478                 .poll =                 snd_pcm_capture_poll,
3479                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3480                 .compat_ioctl =         snd_pcm_ioctl_compat,
3481                 .mmap =                 snd_pcm_mmap,
3482                 .fasync =               snd_pcm_fasync,
3483                 .get_unmapped_area =    dummy_get_unmapped_area,
3484         }
3485 };