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
  40 /*
  41  *  Compatibility
  42  */
  43
  44 struct snd_pcm_hw_params_old {
  45         unsigned int flags;
  46         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  47                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  48         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  49                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  50         unsigned int rmask;
  51         unsigned int cmask;
  52         unsigned int info;
  53         unsigned int msbits;
  54         unsigned int rate_num;
  55         unsigned int rate_den;
  56         snd_pcm_uframes_t fifo_size;
  57         unsigned char reserved[64];
  58 };
  59
  60 #ifdef CONFIG_SND_SUPPORT_OLD_API
  61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  63
  64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 #endif
  69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  70
  71 /*
  72  *
  73  */
  74
  75 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  76 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  77
  78 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  79
  80 static inline mm_segment_t snd_enter_user(void)
  81 {
  82         mm_segment_t fs = get_fs();
  83         set_fs(get_ds());
  84         return fs;
  85 }
  86
  87 static inline void snd_leave_user(mm_segment_t fs)
  88 {
  89         set_fs(fs);
  90 }
  91
  92
  93
  94 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  95 {
  96         struct snd_pcm_runtime *runtime;
  97         struct snd_pcm *pcm = substream->pcm;
  98         struct snd_pcm_str *pstr = substream->pstr;
  99
 100         memset(info, 0, sizeof(*info));
 101         info->card = pcm->card->number;
 102         info->device = pcm->device;
 103         info->stream = substream->stream;
 104         info->subdevice = substream->number;
 105         strlcpy(info->id, pcm->id, sizeof(info->id));
 106         strlcpy(info->name, pcm->name, sizeof(info->name));
 107         info->dev_class = pcm->dev_class;
 108         info->dev_subclass = pcm->dev_subclass;
 109         info->subdevices_count = pstr->substream_count;
 110         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 111         strlcpy(info->subname, substream->name, sizeof(info->subname));
 112         runtime = substream->runtime;
 113         /* AB: FIXME!!! This is definitely nonsense */
 114         if (runtime) {
 115                 info->sync = runtime->sync;
 116                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 117         }
 118         return 0;
 119 }
 120
 121 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 122                       struct snd_pcm_info __user * _info)
 123 {
 124         struct snd_pcm_info *info;
 125         int err;
 126
 127         info = kmalloc(sizeof(*info), GFP_KERNEL);
 128         if (! info)
 129                 return -ENOMEM;
 130         err = snd_pcm_info(substream, info);
 131         if (err >= 0) {
 132                 if (copy_to_user(_info, info, sizeof(*info)))
 133                         err = -EFAULT;
 134         }
 135         kfree(info);
 136         return err;
 137 }
 138
 139 #undef RULES_DEBUG
 140
 141 #ifdef RULES_DEBUG
 142 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 143 char *snd_pcm_hw_param_names[] = {
 144         HW_PARAM(ACCESS),
 145         HW_PARAM(FORMAT),
 146         HW_PARAM(SUBFORMAT),
 147         HW_PARAM(SAMPLE_BITS),
 148         HW_PARAM(FRAME_BITS),
 149         HW_PARAM(CHANNELS),
 150         HW_PARAM(RATE),
 151         HW_PARAM(PERIOD_TIME),
 152         HW_PARAM(PERIOD_SIZE),
 153         HW_PARAM(PERIOD_BYTES),
 154         HW_PARAM(PERIODS),
 155         HW_PARAM(BUFFER_TIME),
 156         HW_PARAM(BUFFER_SIZE),
 157         HW_PARAM(BUFFER_BYTES),
 158         HW_PARAM(TICK_TIME),
 159 };
 160 #endif
 161
 162 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 163                       struct snd_pcm_hw_params *params)
 164 {
 165         unsigned int k;
 166         struct snd_pcm_hardware *hw;
 167         struct snd_interval *i = NULL;
 168         struct snd_mask *m = NULL;
 169         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 170         unsigned int rstamps[constrs->rules_num];
 171         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 172         unsigned int stamp = 2;
 173         int changed, again;
 174
 175         params->info = 0;
 176         params->fifo_size = 0;
 177         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 178                 params->msbits = 0;
 179         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 180                 params->rate_num = 0;
 181                 params->rate_den = 0;
 182         }
 183
 184         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 185                 m = hw_param_mask(params, k);
 186                 if (snd_mask_empty(m))
 187                         return -EINVAL;
 188                 if (!(params->rmask & (1 << k)))
 189                         continue;
 190 #ifdef RULES_DEBUG
 191                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 192                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 193 #endif
 194                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 195 #ifdef RULES_DEBUG
 196                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 197 #endif
 198                 if (changed)
 199                         params->cmask |= 1 << k;
 200                 if (changed < 0)
 201                         return changed;
 202         }
 203
 204         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 205                 i = hw_param_interval(params, k);
 206                 if (snd_interval_empty(i))
 207                         return -EINVAL;
 208                 if (!(params->rmask & (1 << k)))
 209                         continue;
 210 #ifdef RULES_DEBUG
 211                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 212                 if (i->empty)
 213                         printk("empty");
 214                 else
 215                         printk("%c%u %u%c",
 216                                i->openmin ? '(' : '[', i->min,
 217                                i->max, i->openmax ? ')' : ']');
 218                 printk(" -> ");
 219 #endif
 220                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 221 #ifdef RULES_DEBUG
 222                 if (i->empty)
 223                         printk("empty\n");
 224                 else
 225                         printk("%c%u %u%c\n",
 226                                i->openmin ? '(' : '[', i->min,
 227                                i->max, i->openmax ? ')' : ']');
 228 #endif
 229                 if (changed)
 230                         params->cmask |= 1 << k;
 231                 if (changed < 0)
 232                         return changed;
 233         }
 234
 235         for (k = 0; k < constrs->rules_num; k++)
 236                 rstamps[k] = 0;
 237         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 238                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 239         do {
 240                 again = 0;
 241                 for (k = 0; k < constrs->rules_num; k++) {
 242                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 243                         unsigned int d;
 244                         int doit = 0;
 245                         if (r->cond && !(r->cond & params->flags))
 246                                 continue;
 247                         for (d = 0; r->deps[d] >= 0; d++) {
 248                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 249                                         doit = 1;
 250                                         break;
 251                                 }
 252                         }
 253                         if (!doit)
 254                                 continue;
 255 #ifdef RULES_DEBUG
 256                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 257                         if (r->var >= 0) {
 258                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 259                                 if (hw_is_mask(r->var)) {
 260                                         m = hw_param_mask(params, r->var);
 261                                         printk("%x", *m->bits);
 262                                 } else {
 263                                         i = hw_param_interval(params, r->var);
 264                                         if (i->empty)
 265                                                 printk("empty");
 266                                         else
 267                                                 printk("%c%u %u%c",
 268                                                        i->openmin ? '(' : '[', i->min,
 269                                                        i->max, i->openmax ? ')' : ']');
 270                                 }
 271                         }
 272 #endif
 273                         changed = r->func(params, r);
 274 #ifdef RULES_DEBUG
 275                         if (r->var >= 0) {
 276                                 printk(" -> ");
 277                                 if (hw_is_mask(r->var))
 278                                         printk("%x", *m->bits);
 279                                 else {
 280                                         if (i->empty)
 281                                                 printk("empty");
 282                                         else
 283                                                 printk("%c%u %u%c",
 284                                                        i->openmin ? '(' : '[', i->min,
 285                                                        i->max, i->openmax ? ')' : ']');
 286                                 }
 287                         }
 288                         printk("\n");
 289 #endif
 290                         rstamps[k] = stamp;
 291                         if (changed && r->var >= 0) {
 292                                 params->cmask |= (1 << r->var);
 293                                 vstamps[r->var] = stamp;
 294                                 again = 1;
 295                         }
 296                         if (changed < 0)
 297                                 return changed;
 298                         stamp++;
 299                 }
 300         } while (again);
 301         if (!params->msbits) {
 302                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 303                 if (snd_interval_single(i))
 304                         params->msbits = snd_interval_value(i);
 305         }
 306
 307         if (!params->rate_den) {
 308                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 309                 if (snd_interval_single(i)) {
 310                         params->rate_num = snd_interval_value(i);
 311                         params->rate_den = 1;
 312                 }
 313         }
 314
 315         hw = &substream->runtime->hw;
 316         if (!params->info)
 317                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 318         if (!params->fifo_size) {
 319                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 320                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 321                 if (snd_mask_min(m) == snd_mask_max(m) &&
 322                     snd_interval_min(i) == snd_interval_max(i)) {
 323                         changed = substream->ops->ioctl(substream,
 324                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 325                         if (changed < 0)
 326                                 return changed;
 327                 }
 328         }
 329         params->rmask = 0;
 330         return 0;
 331 }
 332
 333 EXPORT_SYMBOL(snd_pcm_hw_refine);
 334
 335 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 336                                   struct snd_pcm_hw_params __user * _params)
 337 {
 338         struct snd_pcm_hw_params *params;
 339         int err;
 340
 341         params = memdup_user(_params, sizeof(*params));
 342         if (IS_ERR(params))
 343                 return PTR_ERR(params);
 344
 345         err = snd_pcm_hw_refine(substream, params);
 346         if (copy_to_user(_params, params, sizeof(*params))) {
 347                 if (!err)
 348                         err = -EFAULT;
 349         }
 350
 351         kfree(params);
 352         return err;
 353 }
 354
 355 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 356 {
 357         int usecs;
 358
 359         if (! runtime->rate)
 360                 return -1; /* invalid */
 361
 362         /* take 75% of period time as the deadline */
 363         usecs = (750000 / runtime->rate) * runtime->period_size;
 364         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 365                 runtime->rate;
 366
 367         return usecs;
 368 }
 369
 370 static int calc_boundary(struct snd_pcm_runtime *runtime)
 371 {
 372         u_int64_t boundary;
 373
 374         boundary = (u_int64_t)runtime->buffer_size *
 375                    (u_int64_t)runtime->period_size;
 376 #if BITS_PER_LONG < 64
 377         /* try to find lowest common multiple for buffer and period */
 378         if (boundary > LONG_MAX - runtime->buffer_size) {
 379                 u_int32_t remainder = -1;
 380                 u_int32_t divident = runtime->buffer_size;
 381                 u_int32_t divisor = runtime->period_size;
 382                 while (remainder) {
 383                         remainder = divident % divisor;
 384                         if (remainder) {
 385                                 divident = divisor;
 386                                 divisor = remainder;
 387                         }
 388                 }
 389                 boundary = div_u64(boundary, divisor);
 390                 if (boundary > LONG_MAX - runtime->buffer_size)
 391                         return -ERANGE;
 392         }
 393 #endif
 394         if (boundary == 0)
 395                 return -ERANGE;
 396         runtime->boundary = boundary;
 397         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 398                 runtime->boundary *= 2;
 399         return 0;
 400 }
 401
 402 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 403                              struct snd_pcm_hw_params *params)
 404 {
 405         struct snd_pcm_runtime *runtime;
 406         int err, usecs;
 407         unsigned int bits;
 408         snd_pcm_uframes_t frames;
 409
 410         if (PCM_RUNTIME_CHECK(substream))
 411                 return -ENXIO;
 412         runtime = substream->runtime;
 413         snd_pcm_stream_lock_irq(substream);
 414         switch (runtime->status->state) {
 415         case SNDRV_PCM_STATE_OPEN:
 416         case SNDRV_PCM_STATE_SETUP:
 417         case SNDRV_PCM_STATE_PREPARED:
 418                 break;
 419         default:
 420                 snd_pcm_stream_unlock_irq(substream);
 421                 return -EBADFD;
 422         }
 423         snd_pcm_stream_unlock_irq(substream);
 424 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 425         if (!substream->oss.oss)
 426 #endif
 427                 if (atomic_read(&substream->mmap_count))
 428                         return -EBADFD;
 429
 430         params->rmask = ~0U;
 431         err = snd_pcm_hw_refine(substream, params);
 432         if (err < 0)
 433                 goto _error;
 434
 435         err = snd_pcm_hw_params_choose(substream, params);
 436         if (err < 0)
 437                 goto _error;
 438
 439         if (substream->ops->hw_params != NULL) {
 440                 err = substream->ops->hw_params(substream, params);
 441                 if (err < 0)
 442                         goto _error;
 443         }
 444
 445         runtime->access = params_access(params);
 446         runtime->format = params_format(params);
 447         runtime->subformat = params_subformat(params);
 448         runtime->channels = params_channels(params);
 449         runtime->rate = params_rate(params);
 450         runtime->period_size = params_period_size(params);
 451         runtime->periods = params_periods(params);
 452         runtime->buffer_size = params_buffer_size(params);
 453         runtime->info = params->info;
 454         runtime->rate_num = params->rate_num;
 455         runtime->rate_den = params->rate_den;
 456
 457         bits = snd_pcm_format_physical_width(runtime->format);
 458         runtime->sample_bits = bits;
 459         bits *= runtime->channels;
 460         runtime->frame_bits = bits;
 461         frames = 1;
 462         while (bits % 8 != 0) {
 463                 bits *= 2;
 464                 frames *= 2;
 465         }
 466         runtime->byte_align = bits / 8;
 467         runtime->min_align = frames;
 468
 469         /* Default sw params */
 470         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 471         runtime->period_step = 1;
 472         runtime->control->avail_min = runtime->period_size;
 473         runtime->start_threshold = 1;
 474         runtime->stop_threshold = runtime->buffer_size;
 475         runtime->silence_threshold = 0;
 476         runtime->silence_size = 0;
 477         err = calc_boundary(runtime);
 478         if (err < 0)
 479                 goto _error;
 480
 481         snd_pcm_timer_resolution_change(substream);
 482         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 483
 484         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 485                                 substream->latency_id);
 486         if ((usecs = period_to_usecs(runtime)) >= 0)
 487                 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
 488                                         substream->latency_id, usecs);
 489         return 0;
 490  _error:
 491         /* hardware might be unuseable from this time,
 492            so we force application to retry to set
 493            the correct hardware parameter settings */
 494         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 495         if (substream->ops->hw_free != NULL)
 496                 substream->ops->hw_free(substream);
 497         return err;
 498 }
 499
 500 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 501                                   struct snd_pcm_hw_params __user * _params)
 502 {
 503         struct snd_pcm_hw_params *params;
 504         int err;
 505
 506         params = memdup_user(_params, sizeof(*params));
 507         if (IS_ERR(params))
 508                 return PTR_ERR(params);
 509
 510         err = snd_pcm_hw_params(substream, params);
 511         if (copy_to_user(_params, params, sizeof(*params))) {
 512                 if (!err)
 513                         err = -EFAULT;
 514         }
 515
 516         kfree(params);
 517         return err;
 518 }
 519
 520 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 521 {
 522         struct snd_pcm_runtime *runtime;
 523         int result = 0;
 524
 525         if (PCM_RUNTIME_CHECK(substream))
 526                 return -ENXIO;
 527         runtime = substream->runtime;
 528         snd_pcm_stream_lock_irq(substream);
 529         switch (runtime->status->state) {
 530         case SNDRV_PCM_STATE_SETUP:
 531         case SNDRV_PCM_STATE_PREPARED:
 532                 break;
 533         default:
 534                 snd_pcm_stream_unlock_irq(substream);
 535                 return -EBADFD;
 536         }
 537         snd_pcm_stream_unlock_irq(substream);
 538         if (atomic_read(&substream->mmap_count))
 539                 return -EBADFD;
 540         if (substream->ops->hw_free)
 541                 result = substream->ops->hw_free(substream);
 542         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 543         pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
 544                 substream->latency_id);
 545         return result;
 546 }
 547
 548 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 549                              struct snd_pcm_sw_params *params)
 550 {
 551         struct snd_pcm_runtime *runtime;
 552         int err;
 553
 554         if (PCM_RUNTIME_CHECK(substream))
 555                 return -ENXIO;
 556         runtime = substream->runtime;
 557         snd_pcm_stream_lock_irq(substream);
 558         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 559                 snd_pcm_stream_unlock_irq(substream);
 560                 return -EBADFD;
 561         }
 562         snd_pcm_stream_unlock_irq(substream);
 563
 564         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 565                 return -EINVAL;
 566         if (params->avail_min == 0)
 567                 return -EINVAL;
 568         if (params->silence_size >= runtime->boundary) {
 569                 if (params->silence_threshold != 0)
 570                         return -EINVAL;
 571         } else {
 572                 if (params->silence_size > params->silence_threshold)
 573                         return -EINVAL;
 574                 if (params->silence_threshold > runtime->buffer_size)
 575                         return -EINVAL;
 576         }
 577         err = 0;
 578         snd_pcm_stream_lock_irq(substream);
 579         runtime->tstamp_mode = params->tstamp_mode;
 580         runtime->period_step = params->period_step;
 581         runtime->control->avail_min = params->avail_min;
 582         runtime->start_threshold = params->start_threshold;
 583         runtime->stop_threshold = params->stop_threshold;
 584         runtime->silence_threshold = params->silence_threshold;
 585         runtime->silence_size = params->silence_size;
 586         params->boundary = runtime->boundary;
 587         if (snd_pcm_running(substream)) {
 588                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 589                     runtime->silence_size > 0)
 590                         snd_pcm_playback_silence(substream, ULONG_MAX);
 591                 err = snd_pcm_update_state(substream, runtime);
 592         }
 593         snd_pcm_stream_unlock_irq(substream);
 594         return err;
 595 }
 596
 597 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 598                                   struct snd_pcm_sw_params __user * _params)
 599 {
 600         struct snd_pcm_sw_params params;
 601         int err;
 602         if (copy_from_user(&params, _params, sizeof(params)))
 603                 return -EFAULT;
 604         err = snd_pcm_sw_params(substream, &params);
 605         if (copy_to_user(_params, &params, sizeof(params)))
 606                 return -EFAULT;
 607         return err;
 608 }
 609
 610 int snd_pcm_status(struct snd_pcm_substream *substream,
 611                    struct snd_pcm_status *status)
 612 {
 613         struct snd_pcm_runtime *runtime = substream->runtime;
 614
 615         snd_pcm_stream_lock_irq(substream);
 616         status->state = runtime->status->state;
 617         status->suspended_state = runtime->status->suspended_state;
 618         if (status->state == SNDRV_PCM_STATE_OPEN)
 619                 goto _end;
 620         status->trigger_tstamp = runtime->trigger_tstamp;
 621         if (snd_pcm_running(substream)) {
 622                 snd_pcm_update_hw_ptr(substream);
 623                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 624                         status->tstamp = runtime->status->tstamp;
 625                         goto _tstamp_end;
 626                 }
 627         }
 628         snd_pcm_gettime(runtime, &status->tstamp);
 629  _tstamp_end:
 630         status->appl_ptr = runtime->control->appl_ptr;
 631         status->hw_ptr = runtime->status->hw_ptr;
 632         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 633                 status->avail = snd_pcm_playback_avail(runtime);
 634                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 635                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 636                         status->delay = runtime->buffer_size - status->avail;
 637                         status->delay += runtime->delay;
 638                 } else
 639                         status->delay = 0;
 640         } else {
 641                 status->avail = snd_pcm_capture_avail(runtime);
 642                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 643                         status->delay = status->avail + runtime->delay;
 644                 else
 645                         status->delay = 0;
 646         }
 647         status->avail_max = runtime->avail_max;
 648         status->overrange = runtime->overrange;
 649         runtime->avail_max = 0;
 650         runtime->overrange = 0;
 651  _end:
 652         snd_pcm_stream_unlock_irq(substream);
 653         return 0;
 654 }
 655
 656 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 657                                struct snd_pcm_status __user * _status)
 658 {
 659         struct snd_pcm_status status;
 660         int res;
 661
 662         memset(&status, 0, sizeof(status));
 663         res = snd_pcm_status(substream, &status);
 664         if (res < 0)
 665                 return res;
 666         if (copy_to_user(_status, &status, sizeof(status)))
 667                 return -EFAULT;
 668         return 0;
 669 }
 670
 671 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 672                                 struct snd_pcm_channel_info * info)
 673 {
 674         struct snd_pcm_runtime *runtime;
 675         unsigned int channel;
 676
 677         channel = info->channel;
 678         runtime = substream->runtime;
 679         snd_pcm_stream_lock_irq(substream);
 680         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 681                 snd_pcm_stream_unlock_irq(substream);
 682                 return -EBADFD;
 683         }
 684         snd_pcm_stream_unlock_irq(substream);
 685         if (channel >= runtime->channels)
 686                 return -EINVAL;
 687         memset(info, 0, sizeof(*info));
 688         info->channel = channel;
 689         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 690 }
 691
 692 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 693                                      struct snd_pcm_channel_info __user * _info)
 694 {
 695         struct snd_pcm_channel_info info;
 696         int res;
 697
 698         if (copy_from_user(&info, _info, sizeof(info)))
 699                 return -EFAULT;
 700         res = snd_pcm_channel_info(substream, &info);
 701         if (res < 0)
 702                 return res;
 703         if (copy_to_user(_info, &info, sizeof(info)))
 704                 return -EFAULT;
 705         return 0;
 706 }
 707
 708 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 709 {
 710         struct snd_pcm_runtime *runtime = substream->runtime;
 711         if (runtime->trigger_master == NULL)
 712                 return;
 713         if (runtime->trigger_master == substream) {
 714                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 715         } else {
 716                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 717                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 718         }
 719         runtime->trigger_master = NULL;
 720 }
 721
 722 struct action_ops {
 723         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 724         int (*do_action)(struct snd_pcm_substream *substream, int state);
 725         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 726         void (*post_action)(struct snd_pcm_substream *substream, int state);
 727 };
 728
 729 /*
 730  *  this functions is core for handling of linked stream
 731  *  Note: the stream state might be changed also on failure
 732  *  Note2: call with calling stream lock + link lock
 733  */
 734 static int snd_pcm_action_group(struct action_ops *ops,
 735                                 struct snd_pcm_substream *substream,
 736                                 int state, int do_lock)
 737 {
 738         struct snd_pcm_substream *s = NULL;
 739         struct snd_pcm_substream *s1;
 740         int res = 0;
 741
 742         snd_pcm_group_for_each_entry(s, substream) {
 743                 if (do_lock && s != substream)
 744                         spin_lock_nested(&s->self_group.lock,
 745                                          SINGLE_DEPTH_NESTING);
 746                 res = ops->pre_action(s, state);
 747                 if (res < 0)
 748                         goto _unlock;
 749         }
 750         snd_pcm_group_for_each_entry(s, substream) {
 751                 res = ops->do_action(s, state);
 752                 if (res < 0) {
 753                         if (ops->undo_action) {
 754                                 snd_pcm_group_for_each_entry(s1, substream) {
 755                                         if (s1 == s) /* failed stream */
 756                                                 break;
 757                                         ops->undo_action(s1, state);
 758                                 }
 759                         }
 760                         s = NULL; /* unlock all */
 761                         goto _unlock;
 762                 }
 763         }
 764         snd_pcm_group_for_each_entry(s, substream) {
 765                 ops->post_action(s, state);
 766         }
 767  _unlock:
 768         if (do_lock) {
 769                 /* unlock streams */
 770                 snd_pcm_group_for_each_entry(s1, substream) {
 771                         if (s1 != substream)
 772                                 spin_unlock(&s1->self_group.lock);
 773                         if (s1 == s)    /* end */
 774                                 break;
 775                 }
 776         }
 777         return res;
 778 }
 779
 780 /*
 781  *  Note: call with stream lock
 782  */
 783 static int snd_pcm_action_single(struct action_ops *ops,
 784                                  struct snd_pcm_substream *substream,
 785                                  int state)
 786 {
 787         int res;
 788
 789         res = ops->pre_action(substream, state);
 790         if (res < 0)
 791                 return res;
 792         res = ops->do_action(substream, state);
 793         if (res == 0)
 794                 ops->post_action(substream, state);
 795         else if (ops->undo_action)
 796                 ops->undo_action(substream, state);
 797         return res;
 798 }
 799
 800 /*
 801  *  Note: call with stream lock
 802  */
 803 static int snd_pcm_action(struct action_ops *ops,
 804                           struct snd_pcm_substream *substream,
 805                           int state)
 806 {
 807         int res;
 808
 809         if (snd_pcm_stream_linked(substream)) {
 810                 if (!spin_trylock(&substream->group->lock)) {
 811                         spin_unlock(&substream->self_group.lock);
 812                         spin_lock(&substream->group->lock);
 813                         spin_lock(&substream->self_group.lock);
 814                 }
 815                 res = snd_pcm_action_group(ops, substream, state, 1);
 816                 spin_unlock(&substream->group->lock);
 817         } else {
 818                 res = snd_pcm_action_single(ops, substream, state);
 819         }
 820         return res;
 821 }
 822
 823 /*
 824  *  Note: don't use any locks before
 825  */
 826 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 827                                    struct snd_pcm_substream *substream,
 828                                    int state)
 829 {
 830         int res;
 831
 832         read_lock_irq(&snd_pcm_link_rwlock);
 833         if (snd_pcm_stream_linked(substream)) {
 834                 spin_lock(&substream->group->lock);
 835                 spin_lock(&substream->self_group.lock);
 836                 res = snd_pcm_action_group(ops, substream, state, 1);
 837                 spin_unlock(&substream->self_group.lock);
 838                 spin_unlock(&substream->group->lock);
 839         } else {
 840                 spin_lock(&substream->self_group.lock);
 841                 res = snd_pcm_action_single(ops, substream, state);
 842                 spin_unlock(&substream->self_group.lock);
 843         }
 844         read_unlock_irq(&snd_pcm_link_rwlock);
 845         return res;
 846 }
 847
 848 /*
 849  */
 850 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 851                                     struct snd_pcm_substream *substream,
 852                                     int state)
 853 {
 854         int res;
 855
 856         down_read(&snd_pcm_link_rwsem);
 857         if (snd_pcm_stream_linked(substream))
 858                 res = snd_pcm_action_group(ops, substream, state, 0);
 859         else
 860                 res = snd_pcm_action_single(ops, substream, state);
 861         up_read(&snd_pcm_link_rwsem);
 862         return res;
 863 }
 864
 865 /*
 866  * start callbacks
 867  */
 868 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 869 {
 870         struct snd_pcm_runtime *runtime = substream->runtime;
 871         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 872                 return -EBADFD;
 873         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 874             !snd_pcm_playback_data(substream))
 875                 return -EPIPE;
 876         runtime->trigger_master = substream;
 877         return 0;
 878 }
 879
 880 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 881 {
 882         if (substream->runtime->trigger_master != substream)
 883                 return 0;
 884         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 885 }
 886
 887 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 888 {
 889         if (substream->runtime->trigger_master == substream)
 890                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 891 }
 892
 893 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 894 {
 895         struct snd_pcm_runtime *runtime = substream->runtime;
 896         snd_pcm_trigger_tstamp(substream);
 897         runtime->hw_ptr_jiffies = jiffies;
 898         runtime->status->state = state;
 899         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 900             runtime->silence_size > 0)
 901                 snd_pcm_playback_silence(substream, ULONG_MAX);
 902         if (substream->timer)
 903                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 904                                  &runtime->trigger_tstamp);
 905 }
 906
 907 static struct action_ops snd_pcm_action_start = {
 908         .pre_action = snd_pcm_pre_start,
 909         .do_action = snd_pcm_do_start,
 910         .undo_action = snd_pcm_undo_start,
 911         .post_action = snd_pcm_post_start
 912 };
 913
 914 /**
 915  * snd_pcm_start - start all linked streams
 916  * @substream: the PCM substream instance
 917  */
 918 int snd_pcm_start(struct snd_pcm_substream *substream)
 919 {
 920         return snd_pcm_action(&snd_pcm_action_start, substream,
 921                               SNDRV_PCM_STATE_RUNNING);
 922 }
 923
 924 /*
 925  * stop callbacks
 926  */
 927 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 928 {
 929         struct snd_pcm_runtime *runtime = substream->runtime;
 930         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 931                 return -EBADFD;
 932         runtime->trigger_master = substream;
 933         return 0;
 934 }
 935
 936 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 937 {
 938         if (substream->runtime->trigger_master == substream &&
 939             snd_pcm_running(substream))
 940                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 941         return 0; /* unconditonally stop all substreams */
 942 }
 943
 944 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 945 {
 946         struct snd_pcm_runtime *runtime = substream->runtime;
 947         if (runtime->status->state != state) {
 948                 snd_pcm_trigger_tstamp(substream);
 949                 if (substream->timer)
 950                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 951                                          &runtime->trigger_tstamp);
 952                 runtime->status->state = state;
 953         }
 954         wake_up(&runtime->sleep);
 955         wake_up(&runtime->tsleep);
 956 }
 957
 958 static struct action_ops snd_pcm_action_stop = {
 959         .pre_action = snd_pcm_pre_stop,
 960         .do_action = snd_pcm_do_stop,
 961         .post_action = snd_pcm_post_stop
 962 };
 963
 964 /**
 965  * snd_pcm_stop - try to stop all running streams in the substream group
 966  * @substream: the PCM substream instance
 967  * @state: PCM state after stopping the stream
 968  *
 969  * The state of each stream is then changed to the given state unconditionally.
 970  */
 971 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 972 {
 973         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 974 }
 975
 976 EXPORT_SYMBOL(snd_pcm_stop);
 977
 978 /**
 979  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 980  * @substream: the PCM substream
 981  *
 982  * After stopping, the state is changed to SETUP.
 983  * Unlike snd_pcm_stop(), this affects only the given stream.
 984  */
 985 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 986 {
 987         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 988                                      SNDRV_PCM_STATE_SETUP);
 989 }
 990
 991 /*
 992  * pause callbacks
 993  */
 994 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 995 {
 996         struct snd_pcm_runtime *runtime = substream->runtime;
 997         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
 998                 return -ENOSYS;
 999         if (push) {
1000                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1001                         return -EBADFD;
1002         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1003                 return -EBADFD;
1004         runtime->trigger_master = substream;
1005         return 0;
1006 }
1007
1008 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1009 {
1010         if (substream->runtime->trigger_master != substream)
1011                 return 0;
1012         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1013          * a delta betwen the current jiffies, this gives a large enough
1014          * delta, effectively to skip the check once.
1015          */
1016         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1017         return substream->ops->trigger(substream,
1018                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1019                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1020 }
1021
1022 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1023 {
1024         if (substream->runtime->trigger_master == substream)
1025                 substream->ops->trigger(substream,
1026                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1027                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1028 }
1029
1030 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1031 {
1032         struct snd_pcm_runtime *runtime = substream->runtime;
1033         snd_pcm_trigger_tstamp(substream);
1034         if (push) {
1035                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1036                 if (substream->timer)
1037                         snd_timer_notify(substream->timer,
1038                                          SNDRV_TIMER_EVENT_MPAUSE,
1039                                          &runtime->trigger_tstamp);
1040                 wake_up(&runtime->sleep);
1041                 wake_up(&runtime->tsleep);
1042         } else {
1043                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1044                 if (substream->timer)
1045                         snd_timer_notify(substream->timer,
1046                                          SNDRV_TIMER_EVENT_MCONTINUE,
1047                                          &runtime->trigger_tstamp);
1048         }
1049 }
1050
1051 static struct action_ops snd_pcm_action_pause = {
1052         .pre_action = snd_pcm_pre_pause,
1053         .do_action = snd_pcm_do_pause,
1054         .undo_action = snd_pcm_undo_pause,
1055         .post_action = snd_pcm_post_pause
1056 };
1057
1058 /*
1059  * Push/release the pause for all linked streams.
1060  */
1061 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1062 {
1063         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1064 }
1065
1066 #ifdef CONFIG_PM
1067 /* suspend */
1068
1069 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1070 {
1071         struct snd_pcm_runtime *runtime = substream->runtime;
1072         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1073                 return -EBUSY;
1074         runtime->trigger_master = substream;
1075         return 0;
1076 }
1077
1078 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1079 {
1080         struct snd_pcm_runtime *runtime = substream->runtime;
1081         if (runtime->trigger_master != substream)
1082                 return 0;
1083         if (! snd_pcm_running(substream))
1084                 return 0;
1085         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1086         return 0; /* suspend unconditionally */
1087 }
1088
1089 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1090 {
1091         struct snd_pcm_runtime *runtime = substream->runtime;
1092         snd_pcm_trigger_tstamp(substream);
1093         if (substream->timer)
1094                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1095                                  &runtime->trigger_tstamp);
1096         runtime->status->suspended_state = runtime->status->state;
1097         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1098         wake_up(&runtime->sleep);
1099         wake_up(&runtime->tsleep);
1100 }
1101
1102 static struct action_ops snd_pcm_action_suspend = {
1103         .pre_action = snd_pcm_pre_suspend,
1104         .do_action = snd_pcm_do_suspend,
1105         .post_action = snd_pcm_post_suspend
1106 };
1107
1108 /**
1109  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1110  * @substream: the PCM substream
1111  *
1112  * After this call, all streams are changed to SUSPENDED state.
1113  */
1114 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1115 {
1116         int err;
1117         unsigned long flags;
1118
1119         if (! substream)
1120                 return 0;
1121
1122         snd_pcm_stream_lock_irqsave(substream, flags);
1123         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1124         snd_pcm_stream_unlock_irqrestore(substream, flags);
1125         return err;
1126 }
1127
1128 EXPORT_SYMBOL(snd_pcm_suspend);
1129
1130 /**
1131  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1132  * @pcm: the PCM instance
1133  *
1134  * After this call, all streams are changed to SUSPENDED state.
1135  */
1136 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1137 {
1138         struct snd_pcm_substream *substream;
1139         int stream, err = 0;
1140
1141         if (! pcm)
1142                 return 0;
1143
1144         for (stream = 0; stream < 2; stream++) {
1145                 for (substream = pcm->streams[stream].substream;
1146                      substream; substream = substream->next) {
1147                         /* FIXME: the open/close code should lock this as well */
1148                         if (substream->runtime == NULL)
1149                                 continue;
1150                         err = snd_pcm_suspend(substream);
1151                         if (err < 0 && err != -EBUSY)
1152                                 return err;
1153                 }
1154         }
1155         return 0;
1156 }
1157
1158 EXPORT_SYMBOL(snd_pcm_suspend_all);
1159
1160 /* resume */
1161
1162 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1163 {
1164         struct snd_pcm_runtime *runtime = substream->runtime;
1165         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1166                 return -ENOSYS;
1167         runtime->trigger_master = substream;
1168         return 0;
1169 }
1170
1171 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1172 {
1173         struct snd_pcm_runtime *runtime = substream->runtime;
1174         if (runtime->trigger_master != substream)
1175                 return 0;
1176         /* DMA not running previously? */
1177         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1178             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1179              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1180                 return 0;
1181         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1182 }
1183
1184 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1185 {
1186         if (substream->runtime->trigger_master == substream &&
1187             snd_pcm_running(substream))
1188                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1189 }
1190
1191 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1192 {
1193         struct snd_pcm_runtime *runtime = substream->runtime;
1194         snd_pcm_trigger_tstamp(substream);
1195         if (substream->timer)
1196                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1197                                  &runtime->trigger_tstamp);
1198         runtime->status->state = runtime->status->suspended_state;
1199 }
1200
1201 static struct action_ops snd_pcm_action_resume = {
1202         .pre_action = snd_pcm_pre_resume,
1203         .do_action = snd_pcm_do_resume,
1204         .undo_action = snd_pcm_undo_resume,
1205         .post_action = snd_pcm_post_resume
1206 };
1207
1208 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1209 {
1210         struct snd_card *card = substream->pcm->card;
1211         int res;
1212
1213         snd_power_lock(card);
1214         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1215                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1216         snd_power_unlock(card);
1217         return res;
1218 }
1219
1220 #else
1221
1222 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1223 {
1224         return -ENOSYS;
1225 }
1226
1227 #endif /* CONFIG_PM */
1228
1229 /*
1230  * xrun ioctl
1231  *
1232  * Change the RUNNING stream(s) to XRUN state.
1233  */
1234 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1235 {
1236         struct snd_card *card = substream->pcm->card;
1237         struct snd_pcm_runtime *runtime = substream->runtime;
1238         int result;
1239
1240         snd_power_lock(card);
1241         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1242                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1243                 if (result < 0)
1244                         goto _unlock;
1245         }
1246
1247         snd_pcm_stream_lock_irq(substream);
1248         switch (runtime->status->state) {
1249         case SNDRV_PCM_STATE_XRUN:
1250                 result = 0;     /* already there */
1251                 break;
1252         case SNDRV_PCM_STATE_RUNNING:
1253                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1254                 break;
1255         default:
1256                 result = -EBADFD;
1257         }
1258         snd_pcm_stream_unlock_irq(substream);
1259  _unlock:
1260         snd_power_unlock(card);
1261         return result;
1262 }
1263
1264 /*
1265  * reset ioctl
1266  */
1267 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1268 {
1269         struct snd_pcm_runtime *runtime = substream->runtime;
1270         switch (runtime->status->state) {
1271         case SNDRV_PCM_STATE_RUNNING:
1272         case SNDRV_PCM_STATE_PREPARED:
1273         case SNDRV_PCM_STATE_PAUSED:
1274         case SNDRV_PCM_STATE_SUSPENDED:
1275                 return 0;
1276         default:
1277                 return -EBADFD;
1278         }
1279 }
1280
1281 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1282 {
1283         struct snd_pcm_runtime *runtime = substream->runtime;
1284         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1285         if (err < 0)
1286                 return err;
1287         runtime->hw_ptr_base = 0;
1288         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1289                 runtime->status->hw_ptr % runtime->period_size;
1290         runtime->silence_start = runtime->status->hw_ptr;
1291         runtime->silence_filled = 0;
1292         return 0;
1293 }
1294
1295 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1296 {
1297         struct snd_pcm_runtime *runtime = substream->runtime;
1298         runtime->control->appl_ptr = runtime->status->hw_ptr;
1299         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1300             runtime->silence_size > 0)
1301                 snd_pcm_playback_silence(substream, ULONG_MAX);
1302 }
1303
1304 static struct action_ops snd_pcm_action_reset = {
1305         .pre_action = snd_pcm_pre_reset,
1306         .do_action = snd_pcm_do_reset,
1307         .post_action = snd_pcm_post_reset
1308 };
1309
1310 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1311 {
1312         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1313 }
1314
1315 /*
1316  * prepare ioctl
1317  */
1318 /* we use the second argument for updating f_flags */
1319 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1320                                int f_flags)
1321 {
1322         struct snd_pcm_runtime *runtime = substream->runtime;
1323         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1324             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1325                 return -EBADFD;
1326         if (snd_pcm_running(substream))
1327                 return -EBUSY;
1328         substream->f_flags = f_flags;
1329         return 0;
1330 }
1331
1332 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1333 {
1334         int err;
1335         err = substream->ops->prepare(substream);
1336         if (err < 0)
1337                 return err;
1338         return snd_pcm_do_reset(substream, 0);
1339 }
1340
1341 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1342 {
1343         struct snd_pcm_runtime *runtime = substream->runtime;
1344         runtime->control->appl_ptr = runtime->status->hw_ptr;
1345         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1346 }
1347
1348 static struct action_ops snd_pcm_action_prepare = {
1349         .pre_action = snd_pcm_pre_prepare,
1350         .do_action = snd_pcm_do_prepare,
1351         .post_action = snd_pcm_post_prepare
1352 };
1353
1354 /**
1355  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1356  * @substream: the PCM substream instance
1357  * @file: file to refer f_flags
1358  */
1359 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1360                            struct file *file)
1361 {
1362         int res;
1363         struct snd_card *card = substream->pcm->card;
1364         int f_flags;
1365
1366         if (file)
1367                 f_flags = file->f_flags;
1368         else
1369                 f_flags = substream->f_flags;
1370
1371         snd_power_lock(card);
1372         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1373                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1374                                                substream, f_flags);
1375         snd_power_unlock(card);
1376         return res;
1377 }
1378
1379 /*
1380  * drain ioctl
1381  */
1382
1383 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1384 {
1385         substream->runtime->trigger_master = substream;
1386         return 0;
1387 }
1388
1389 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1390 {
1391         struct snd_pcm_runtime *runtime = substream->runtime;
1392         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1393                 switch (runtime->status->state) {
1394                 case SNDRV_PCM_STATE_PREPARED:
1395                         /* start playback stream if possible */
1396                         if (! snd_pcm_playback_empty(substream)) {
1397                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1398                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1399                         }
1400                         break;
1401                 case SNDRV_PCM_STATE_RUNNING:
1402                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1403                         break;
1404                 default:
1405                         break;
1406                 }
1407         } else {
1408                 /* stop running stream */
1409                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1410                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1411                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1412                         snd_pcm_do_stop(substream, new_state);
1413                         snd_pcm_post_stop(substream, new_state);
1414                 }
1415         }
1416         return 0;
1417 }
1418
1419 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1420 {
1421 }
1422
1423 static struct action_ops snd_pcm_action_drain_init = {
1424         .pre_action = snd_pcm_pre_drain_init,
1425         .do_action = snd_pcm_do_drain_init,
1426         .post_action = snd_pcm_post_drain_init
1427 };
1428
1429 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1430
1431 /*
1432  * Drain the stream(s).
1433  * When the substream is linked, sync until the draining of all playback streams
1434  * is finished.
1435  * After this call, all streams are supposed to be either SETUP or DRAINING
1436  * (capture only) state.
1437  */
1438 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1439                          struct file *file)
1440 {
1441         struct snd_card *card;
1442         struct snd_pcm_runtime *runtime;
1443         struct snd_pcm_substream *s;
1444         wait_queue_t wait;
1445         int result = 0;
1446         int nonblock = 0;
1447
1448         card = substream->pcm->card;
1449         runtime = substream->runtime;
1450
1451         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1452                 return -EBADFD;
1453
1454         snd_power_lock(card);
1455         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1456                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1457                 if (result < 0) {
1458                         snd_power_unlock(card);
1459                         return result;
1460                 }
1461         }
1462
1463         if (file) {
1464                 if (file->f_flags & O_NONBLOCK)
1465                         nonblock = 1;
1466         } else if (substream->f_flags & O_NONBLOCK)
1467                 nonblock = 1;
1468
1469         down_read(&snd_pcm_link_rwsem);
1470         snd_pcm_stream_lock_irq(substream);
1471         /* resume pause */
1472         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1473                 snd_pcm_pause(substream, 0);
1474
1475         /* pre-start/stop - all running streams are changed to DRAINING state */
1476         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1477         if (result < 0)
1478                 goto unlock;
1479         /* in non-blocking, we don't wait in ioctl but let caller poll */
1480         if (nonblock) {
1481                 result = -EAGAIN;
1482                 goto unlock;
1483         }
1484
1485         for (;;) {
1486                 long tout;
1487                 struct snd_pcm_runtime *to_check;
1488                 if (signal_pending(current)) {
1489                         result = -ERESTARTSYS;
1490                         break;
1491                 }
1492                 /* find a substream to drain */
1493                 to_check = NULL;
1494                 snd_pcm_group_for_each_entry(s, substream) {
1495                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1496                                 continue;
1497                         runtime = s->runtime;
1498                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1499                                 to_check = runtime;
1500                                 break;
1501                         }
1502                 }
1503                 if (!to_check)
1504                         break; /* all drained */
1505                 init_waitqueue_entry(&wait, current);
1506                 add_wait_queue(&to_check->sleep, &wait);
1507                 set_current_state(TASK_INTERRUPTIBLE);
1508                 snd_pcm_stream_unlock_irq(substream);
1509                 up_read(&snd_pcm_link_rwsem);
1510                 snd_power_unlock(card);
1511                 tout = schedule_timeout(10 * HZ);
1512                 snd_power_lock(card);
1513                 down_read(&snd_pcm_link_rwsem);
1514                 snd_pcm_stream_lock_irq(substream);
1515                 remove_wait_queue(&to_check->sleep, &wait);
1516                 if (tout == 0) {
1517                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1518                                 result = -ESTRPIPE;
1519                         else {
1520                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1521                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1522                                 result = -EIO;
1523                         }
1524                         break;
1525                 }
1526         }
1527
1528  unlock:
1529         snd_pcm_stream_unlock_irq(substream);
1530         up_read(&snd_pcm_link_rwsem);
1531         snd_power_unlock(card);
1532
1533         return result;
1534 }
1535
1536 /*
1537  * drop ioctl
1538  *
1539  * Immediately put all linked substreams into SETUP state.
1540  */
1541 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1542 {
1543         struct snd_pcm_runtime *runtime;
1544         struct snd_card *card;
1545         int result = 0;
1546
1547         if (PCM_RUNTIME_CHECK(substream))
1548                 return -ENXIO;
1549         runtime = substream->runtime;
1550         card = substream->pcm->card;
1551
1552         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1553             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1554             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1555                 return -EBADFD;
1556
1557         snd_pcm_stream_lock_irq(substream);
1558         /* resume pause */
1559         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1560                 snd_pcm_pause(substream, 0);
1561
1562         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1563         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1564         snd_pcm_stream_unlock_irq(substream);
1565
1566         return result;
1567 }
1568
1569
1570 /* WARNING: Don't forget to fput back the file */
1571 static struct file *snd_pcm_file_fd(int fd)
1572 {
1573         struct file *file;
1574         struct inode *inode;
1575         unsigned int minor;
1576
1577         file = fget(fd);
1578         if (!file)
1579                 return NULL;
1580         inode = file->f_path.dentry->d_inode;
1581         if (!S_ISCHR(inode->i_mode) ||
1582             imajor(inode) != snd_major) {
1583                 fput(file);
1584                 return NULL;
1585         }
1586         minor = iminor(inode);
1587         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1588             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1589                 fput(file);
1590                 return NULL;
1591         }
1592         return file;
1593 }
1594
1595 /*
1596  * PCM link handling
1597  */
1598 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1599 {
1600         int res = 0;
1601         struct file *file;
1602         struct snd_pcm_file *pcm_file;
1603         struct snd_pcm_substream *substream1;
1604
1605         file = snd_pcm_file_fd(fd);
1606         if (!file)
1607                 return -EBADFD;
1608         pcm_file = file->private_data;
1609         substream1 = pcm_file->substream;
1610         down_write(&snd_pcm_link_rwsem);
1611         write_lock_irq(&snd_pcm_link_rwlock);
1612         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1613             substream->runtime->status->state != substream1->runtime->status->state) {
1614                 res = -EBADFD;
1615                 goto _end;
1616         }
1617         if (snd_pcm_stream_linked(substream1)) {
1618                 res = -EALREADY;
1619                 goto _end;
1620         }
1621         if (!snd_pcm_stream_linked(substream)) {
1622                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1623                 if (substream->group == NULL) {
1624                         res = -ENOMEM;
1625                         goto _end;
1626                 }
1627                 spin_lock_init(&substream->group->lock);
1628                 INIT_LIST_HEAD(&substream->group->substreams);
1629                 list_add_tail(&substream->link_list, &substream->group->substreams);
1630                 substream->group->count = 1;
1631         }
1632         list_add_tail(&substream1->link_list, &substream->group->substreams);
1633         substream->group->count++;
1634         substream1->group = substream->group;
1635  _end:
1636         write_unlock_irq(&snd_pcm_link_rwlock);
1637         up_write(&snd_pcm_link_rwsem);
1638         fput(file);
1639         return res;
1640 }
1641
1642 static void relink_to_local(struct snd_pcm_substream *substream)
1643 {
1644         substream->group = &substream->self_group;
1645         INIT_LIST_HEAD(&substream->self_group.substreams);
1646         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1647 }
1648
1649 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1650 {
1651         struct snd_pcm_substream *s;
1652         int res = 0;
1653
1654         down_write(&snd_pcm_link_rwsem);
1655         write_lock_irq(&snd_pcm_link_rwlock);
1656         if (!snd_pcm_stream_linked(substream)) {
1657                 res = -EALREADY;
1658                 goto _end;
1659         }
1660         list_del(&substream->link_list);
1661         substream->group->count--;
1662         if (substream->group->count == 1) {     /* detach the last stream, too */
1663                 snd_pcm_group_for_each_entry(s, substream) {
1664                         relink_to_local(s);
1665                         break;
1666                 }
1667                 kfree(substream->group);
1668         }
1669         relink_to_local(substream);
1670        _end:
1671         write_unlock_irq(&snd_pcm_link_rwlock);
1672         up_write(&snd_pcm_link_rwsem);
1673         return res;
1674 }
1675
1676 /*
1677  * hw configurator
1678  */
1679 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1680                                struct snd_pcm_hw_rule *rule)
1681 {
1682         struct snd_interval t;
1683         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1684                      hw_param_interval_c(params, rule->deps[1]), &t);
1685         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1686 }
1687
1688 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1689                                struct snd_pcm_hw_rule *rule)
1690 {
1691         struct snd_interval t;
1692         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1693                      hw_param_interval_c(params, rule->deps[1]), &t);
1694         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1695 }
1696
1697 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1698                                    struct snd_pcm_hw_rule *rule)
1699 {
1700         struct snd_interval t;
1701         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1702                          hw_param_interval_c(params, rule->deps[1]),
1703                          (unsigned long) rule->private, &t);
1704         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1705 }
1706
1707 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1708                                    struct snd_pcm_hw_rule *rule)
1709 {
1710         struct snd_interval t;
1711         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1712                          (unsigned long) rule->private,
1713                          hw_param_interval_c(params, rule->deps[1]), &t);
1714         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1715 }
1716
1717 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1718                                   struct snd_pcm_hw_rule *rule)
1719 {
1720         unsigned int k;
1721         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1722         struct snd_mask m;
1723         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1724         snd_mask_any(&m);
1725         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1726                 int bits;
1727                 if (! snd_mask_test(mask, k))
1728                         continue;
1729                 bits = snd_pcm_format_physical_width(k);
1730                 if (bits <= 0)
1731                         continue; /* ignore invalid formats */
1732                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1733                         snd_mask_reset(&m, k);
1734         }
1735         return snd_mask_refine(mask, &m);
1736 }
1737
1738 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1739                                        struct snd_pcm_hw_rule *rule)
1740 {
1741         struct snd_interval t;
1742         unsigned int k;
1743         t.min = UINT_MAX;
1744         t.max = 0;
1745         t.openmin = 0;
1746         t.openmax = 0;
1747         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1748                 int bits;
1749                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1750                         continue;
1751                 bits = snd_pcm_format_physical_width(k);
1752                 if (bits <= 0)
1753                         continue; /* ignore invalid formats */
1754                 if (t.min > (unsigned)bits)
1755                         t.min = bits;
1756                 if (t.max < (unsigned)bits)
1757                         t.max = bits;
1758         }
1759         t.integer = 1;
1760         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1761 }
1762
1763 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1764 #error "Change this table"
1765 #endif
1766
1767 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1768                                  48000, 64000, 88200, 96000, 176400, 192000 };
1769
1770 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1771         .count = ARRAY_SIZE(rates),
1772         .list = rates,
1773 };
1774
1775 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1776                                 struct snd_pcm_hw_rule *rule)
1777 {
1778         struct snd_pcm_hardware *hw = rule->private;
1779         return snd_interval_list(hw_param_interval(params, rule->var),
1780                                  snd_pcm_known_rates.count,
1781                                  snd_pcm_known_rates.list, hw->rates);
1782 }
1783
1784 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1785                                             struct snd_pcm_hw_rule *rule)
1786 {
1787         struct snd_interval t;
1788         struct snd_pcm_substream *substream = rule->private;
1789         t.min = 0;
1790         t.max = substream->buffer_bytes_max;
1791         t.openmin = 0;
1792         t.openmax = 0;
1793         t.integer = 1;
1794         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1795 }
1796
1797 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1798 {
1799         struct snd_pcm_runtime *runtime = substream->runtime;
1800         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1801         int k, err;
1802
1803         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1804                 snd_mask_any(constrs_mask(constrs, k));
1805         }
1806
1807         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1808                 snd_interval_any(constrs_interval(constrs, k));
1809         }
1810
1811         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1812         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1813         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1814         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1815         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1816
1817         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1818                                    snd_pcm_hw_rule_format, NULL,
1819                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1820         if (err < 0)
1821                 return err;
1822         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1823                                   snd_pcm_hw_rule_sample_bits, NULL,
1824                                   SNDRV_PCM_HW_PARAM_FORMAT,
1825                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1826         if (err < 0)
1827                 return err;
1828         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1829                                   snd_pcm_hw_rule_div, NULL,
1830                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1831         if (err < 0)
1832                 return err;
1833         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1834                                   snd_pcm_hw_rule_mul, NULL,
1835                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1836         if (err < 0)
1837                 return err;
1838         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1839                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1840                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1841         if (err < 0)
1842                 return err;
1843         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1844                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1845                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1849                                   snd_pcm_hw_rule_div, NULL,
1850                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1854                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1855                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1856         if (err < 0)
1857                 return err;
1858         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1859                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1860                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1864                                   snd_pcm_hw_rule_div, NULL,
1865                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1869                                   snd_pcm_hw_rule_div, NULL,
1870                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1871         if (err < 0)
1872                 return err;
1873         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1874                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1875                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1876         if (err < 0)
1877                 return err;
1878         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1879                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1880                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1884                                   snd_pcm_hw_rule_mul, NULL,
1885                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1886         if (err < 0)
1887                 return err;
1888         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1889                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1890                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1891         if (err < 0)
1892                 return err;
1893         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1894                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1895                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1899                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1900                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1904                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1905                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1906         if (err < 0)
1907                 return err;
1908         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1909                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1910                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1911         if (err < 0)
1912                 return err;
1913         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1914                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1915                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1916         if (err < 0)
1917                 return err;
1918         return 0;
1919 }
1920
1921 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1922 {
1923         struct snd_pcm_runtime *runtime = substream->runtime;
1924         struct snd_pcm_hardware *hw = &runtime->hw;
1925         int err;
1926         unsigned int mask = 0;
1927
1928         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1929                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1930         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1931                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1932         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1933                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1934                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1935                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1936                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1937                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1938                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1939         }
1940         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1941         if (err < 0)
1942                 return err;
1943
1944         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1945         if (err < 0)
1946                 return err;
1947
1948         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1949         if (err < 0)
1950                 return err;
1951
1952         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1953                                            hw->channels_min, hw->channels_max);
1954         if (err < 0)
1955                 return err;
1956
1957         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1958                                            hw->rate_min, hw->rate_max);
1959         if (err < 0)
1960                 return err;
1961
1962         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1963                                            hw->period_bytes_min, hw->period_bytes_max);
1964         if (err < 0)
1965                 return err;
1966
1967         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1968                                            hw->periods_min, hw->periods_max);
1969         if (err < 0)
1970                 return err;
1971
1972         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1973                                            hw->period_bytes_min, hw->buffer_bytes_max);
1974         if (err < 0)
1975                 return err;
1976
1977         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1978                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1979                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1980         if (err < 0)
1981                 return err;
1982
1983         /* FIXME: remove */
1984         if (runtime->dma_bytes) {
1985                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1986                 if (err < 0)
1987                         return -EINVAL;
1988         }
1989
1990         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1991                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1992                                           snd_pcm_hw_rule_rate, hw,
1993                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1994                 if (err < 0)
1995                         return err;
1996         }
1997
1998         /* FIXME: this belong to lowlevel */
1999         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2000
2001         return 0;
2002 }
2003
2004 static void pcm_release_private(struct snd_pcm_substream *substream)
2005 {
2006         snd_pcm_unlink(substream);
2007 }
2008
2009 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2010 {
2011         substream->ref_count--;
2012         if (substream->ref_count > 0)
2013                 return;
2014
2015         snd_pcm_drop(substream);
2016         if (substream->hw_opened) {
2017                 if (substream->ops->hw_free != NULL)
2018                         substream->ops->hw_free(substream);
2019                 substream->ops->close(substream);
2020                 substream->hw_opened = 0;
2021         }
2022         if (substream->pcm_release) {
2023                 substream->pcm_release(substream);
2024                 substream->pcm_release = NULL;
2025         }
2026         snd_pcm_detach_substream(substream);
2027 }
2028
2029 EXPORT_SYMBOL(snd_pcm_release_substream);
2030
2031 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2032                            struct file *file,
2033                            struct snd_pcm_substream **rsubstream)
2034 {
2035         struct snd_pcm_substream *substream;
2036         int err;
2037
2038         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2039         if (err < 0)
2040                 return err;
2041         if (substream->ref_count > 1) {
2042                 *rsubstream = substream;
2043                 return 0;
2044         }
2045
2046         err = snd_pcm_hw_constraints_init(substream);
2047         if (err < 0) {
2048                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2049                 goto error;
2050         }
2051
2052         if ((err = substream->ops->open(substream)) < 0)
2053                 goto error;
2054
2055         substream->hw_opened = 1;
2056
2057         err = snd_pcm_hw_constraints_complete(substream);
2058         if (err < 0) {
2059                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2060                 goto error;
2061         }
2062
2063         *rsubstream = substream;
2064         return 0;
2065
2066  error:
2067         snd_pcm_release_substream(substream);
2068         return err;
2069 }
2070
2071 EXPORT_SYMBOL(snd_pcm_open_substream);
2072
2073 static int snd_pcm_open_file(struct file *file,
2074                              struct snd_pcm *pcm,
2075                              int stream,
2076                              struct snd_pcm_file **rpcm_file)
2077 {
2078         struct snd_pcm_file *pcm_file;
2079         struct snd_pcm_substream *substream;
2080         struct snd_pcm_str *str;
2081         int err;
2082
2083         if (rpcm_file)
2084                 *rpcm_file = NULL;
2085
2086         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2087         if (err < 0)
2088                 return err;
2089
2090         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2091         if (pcm_file == NULL) {
2092                 snd_pcm_release_substream(substream);
2093                 return -ENOMEM;
2094         }
2095         pcm_file->substream = substream;
2096         if (substream->ref_count == 1) {
2097                 str = substream->pstr;
2098                 substream->file = pcm_file;
2099                 substream->pcm_release = pcm_release_private;
2100         }
2101         file->private_data = pcm_file;
2102         if (rpcm_file)
2103                 *rpcm_file = pcm_file;
2104         return 0;
2105 }
2106
2107 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2108 {
2109         struct snd_pcm *pcm;
2110
2111         pcm = snd_lookup_minor_data(iminor(inode),
2112                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2113         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2114 }
2115
2116 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2117 {
2118         struct snd_pcm *pcm;
2119
2120         pcm = snd_lookup_minor_data(iminor(inode),
2121                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2122         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2123 }
2124
2125 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2126 {
2127         int err;
2128         struct snd_pcm_file *pcm_file;
2129         wait_queue_t wait;
2130
2131         if (pcm == NULL) {
2132                 err = -ENODEV;
2133                 goto __error1;
2134         }
2135         err = snd_card_file_add(pcm->card, file);
2136         if (err < 0)
2137                 goto __error1;
2138         if (!try_module_get(pcm->card->module)) {
2139                 err = -EFAULT;
2140                 goto __error2;
2141         }
2142         init_waitqueue_entry(&wait, current);
2143         add_wait_queue(&pcm->open_wait, &wait);
2144         mutex_lock(&pcm->open_mutex);
2145         while (1) {
2146                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2147                 if (err >= 0)
2148                         break;
2149                 if (err == -EAGAIN) {
2150                         if (file->f_flags & O_NONBLOCK) {
2151                                 err = -EBUSY;
2152                                 break;
2153                         }
2154                 } else
2155                         break;
2156                 set_current_state(TASK_INTERRUPTIBLE);
2157                 mutex_unlock(&pcm->open_mutex);
2158                 schedule();
2159                 mutex_lock(&pcm->open_mutex);
2160                 if (signal_pending(current)) {
2161                         err = -ERESTARTSYS;
2162                         break;
2163                 }
2164         }
2165         remove_wait_queue(&pcm->open_wait, &wait);
2166         mutex_unlock(&pcm->open_mutex);
2167         if (err < 0)
2168                 goto __error;
2169         return err;
2170
2171       __error:
2172         module_put(pcm->card->module);
2173       __error2:
2174         snd_card_file_remove(pcm->card, file);
2175       __error1:
2176         return err;
2177 }
2178
2179 static int snd_pcm_release(struct inode *inode, struct file *file)
2180 {
2181         struct snd_pcm *pcm;
2182         struct snd_pcm_substream *substream;
2183         struct snd_pcm_file *pcm_file;
2184
2185         pcm_file = file->private_data;
2186         substream = pcm_file->substream;
2187         if (snd_BUG_ON(!substream))
2188                 return -ENXIO;
2189         pcm = substream->pcm;
2190         mutex_lock(&pcm->open_mutex);
2191         snd_pcm_release_substream(substream);
2192         kfree(pcm_file);
2193         mutex_unlock(&pcm->open_mutex);
2194         wake_up(&pcm->open_wait);
2195         module_put(pcm->card->module);
2196         snd_card_file_remove(pcm->card, file);
2197         return 0;
2198 }
2199
2200 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2201                                                  snd_pcm_uframes_t frames)
2202 {
2203         struct snd_pcm_runtime *runtime = substream->runtime;
2204         snd_pcm_sframes_t appl_ptr;
2205         snd_pcm_sframes_t ret;
2206         snd_pcm_sframes_t hw_avail;
2207
2208         if (frames == 0)
2209                 return 0;
2210
2211         snd_pcm_stream_lock_irq(substream);
2212         switch (runtime->status->state) {
2213         case SNDRV_PCM_STATE_PREPARED:
2214                 break;
2215         case SNDRV_PCM_STATE_DRAINING:
2216         case SNDRV_PCM_STATE_RUNNING:
2217                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2218                         break;
2219                 /* Fall through */
2220         case SNDRV_PCM_STATE_XRUN:
2221                 ret = -EPIPE;
2222                 goto __end;
2223         case SNDRV_PCM_STATE_SUSPENDED:
2224                 ret = -ESTRPIPE;
2225                 goto __end;
2226         default:
2227                 ret = -EBADFD;
2228                 goto __end;
2229         }
2230
2231         hw_avail = snd_pcm_playback_hw_avail(runtime);
2232         if (hw_avail <= 0) {
2233                 ret = 0;
2234                 goto __end;
2235         }
2236         if (frames > (snd_pcm_uframes_t)hw_avail)
2237                 frames = hw_avail;
2238         appl_ptr = runtime->control->appl_ptr - frames;
2239         if (appl_ptr < 0)
2240                 appl_ptr += runtime->boundary;
2241         runtime->control->appl_ptr = appl_ptr;
2242         ret = frames;
2243  __end:
2244         snd_pcm_stream_unlock_irq(substream);
2245         return ret;
2246 }
2247
2248 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2249                                                 snd_pcm_uframes_t frames)
2250 {
2251         struct snd_pcm_runtime *runtime = substream->runtime;
2252         snd_pcm_sframes_t appl_ptr;
2253         snd_pcm_sframes_t ret;
2254         snd_pcm_sframes_t hw_avail;
2255
2256         if (frames == 0)
2257                 return 0;
2258
2259         snd_pcm_stream_lock_irq(substream);
2260         switch (runtime->status->state) {
2261         case SNDRV_PCM_STATE_PREPARED:
2262         case SNDRV_PCM_STATE_DRAINING:
2263                 break;
2264         case SNDRV_PCM_STATE_RUNNING:
2265                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2266                         break;
2267                 /* Fall through */
2268         case SNDRV_PCM_STATE_XRUN:
2269                 ret = -EPIPE;
2270                 goto __end;
2271         case SNDRV_PCM_STATE_SUSPENDED:
2272                 ret = -ESTRPIPE;
2273                 goto __end;
2274         default:
2275                 ret = -EBADFD;
2276                 goto __end;
2277         }
2278
2279         hw_avail = snd_pcm_capture_hw_avail(runtime);
2280         if (hw_avail <= 0) {
2281                 ret = 0;
2282                 goto __end;
2283         }
2284         if (frames > (snd_pcm_uframes_t)hw_avail)
2285                 frames = hw_avail;
2286         appl_ptr = runtime->control->appl_ptr - frames;
2287         if (appl_ptr < 0)
2288                 appl_ptr += runtime->boundary;
2289         runtime->control->appl_ptr = appl_ptr;
2290         ret = frames;
2291  __end:
2292         snd_pcm_stream_unlock_irq(substream);
2293         return ret;
2294 }
2295
2296 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2297                                                   snd_pcm_uframes_t frames)
2298 {
2299         struct snd_pcm_runtime *runtime = substream->runtime;
2300         snd_pcm_sframes_t appl_ptr;
2301         snd_pcm_sframes_t ret;
2302         snd_pcm_sframes_t avail;
2303
2304         if (frames == 0)
2305                 return 0;
2306
2307         snd_pcm_stream_lock_irq(substream);
2308         switch (runtime->status->state) {
2309         case SNDRV_PCM_STATE_PREPARED:
2310         case SNDRV_PCM_STATE_PAUSED:
2311                 break;
2312         case SNDRV_PCM_STATE_DRAINING:
2313         case SNDRV_PCM_STATE_RUNNING:
2314                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2315                         break;
2316                 /* Fall through */
2317         case SNDRV_PCM_STATE_XRUN:
2318                 ret = -EPIPE;
2319                 goto __end;
2320         case SNDRV_PCM_STATE_SUSPENDED:
2321                 ret = -ESTRPIPE;
2322                 goto __end;
2323         default:
2324                 ret = -EBADFD;
2325                 goto __end;
2326         }
2327
2328         avail = snd_pcm_playback_avail(runtime);
2329         if (avail <= 0) {
2330                 ret = 0;
2331                 goto __end;
2332         }
2333         if (frames > (snd_pcm_uframes_t)avail)
2334                 frames = avail;
2335         appl_ptr = runtime->control->appl_ptr + frames;
2336         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2337                 appl_ptr -= runtime->boundary;
2338         runtime->control->appl_ptr = appl_ptr;
2339         ret = frames;
2340  __end:
2341         snd_pcm_stream_unlock_irq(substream);
2342         return ret;
2343 }
2344
2345 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2346                                                  snd_pcm_uframes_t frames)
2347 {
2348         struct snd_pcm_runtime *runtime = substream->runtime;
2349         snd_pcm_sframes_t appl_ptr;
2350         snd_pcm_sframes_t ret;
2351         snd_pcm_sframes_t avail;
2352
2353         if (frames == 0)
2354                 return 0;
2355
2356         snd_pcm_stream_lock_irq(substream);
2357         switch (runtime->status->state) {
2358         case SNDRV_PCM_STATE_PREPARED:
2359         case SNDRV_PCM_STATE_DRAINING:
2360         case SNDRV_PCM_STATE_PAUSED:
2361                 break;
2362         case SNDRV_PCM_STATE_RUNNING:
2363                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2364                         break;
2365                 /* Fall through */
2366         case SNDRV_PCM_STATE_XRUN:
2367                 ret = -EPIPE;
2368                 goto __end;
2369         case SNDRV_PCM_STATE_SUSPENDED:
2370                 ret = -ESTRPIPE;
2371                 goto __end;
2372         default:
2373                 ret = -EBADFD;
2374                 goto __end;
2375         }
2376
2377         avail = snd_pcm_capture_avail(runtime);
2378         if (avail <= 0) {
2379                 ret = 0;
2380                 goto __end;
2381         }
2382         if (frames > (snd_pcm_uframes_t)avail)
2383                 frames = avail;
2384         appl_ptr = runtime->control->appl_ptr + frames;
2385         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2386                 appl_ptr -= runtime->boundary;
2387         runtime->control->appl_ptr = appl_ptr;
2388         ret = frames;
2389  __end:
2390         snd_pcm_stream_unlock_irq(substream);
2391         return ret;
2392 }
2393
2394 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2395 {
2396         struct snd_pcm_runtime *runtime = substream->runtime;
2397         int err;
2398
2399         snd_pcm_stream_lock_irq(substream);
2400         switch (runtime->status->state) {
2401         case SNDRV_PCM_STATE_DRAINING:
2402                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2403                         goto __badfd;
2404         case SNDRV_PCM_STATE_RUNNING:
2405                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2406                         break;
2407                 /* Fall through */
2408         case SNDRV_PCM_STATE_PREPARED:
2409         case SNDRV_PCM_STATE_SUSPENDED:
2410                 err = 0;
2411                 break;
2412         case SNDRV_PCM_STATE_XRUN:
2413                 err = -EPIPE;
2414                 break;
2415         default:
2416               __badfd:
2417                 err = -EBADFD;
2418                 break;
2419         }
2420         snd_pcm_stream_unlock_irq(substream);
2421         return err;
2422 }
2423
2424 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2425                          snd_pcm_sframes_t __user *res)
2426 {
2427         struct snd_pcm_runtime *runtime = substream->runtime;
2428         int err;
2429         snd_pcm_sframes_t n = 0;
2430
2431         snd_pcm_stream_lock_irq(substream);
2432         switch (runtime->status->state) {
2433         case SNDRV_PCM_STATE_DRAINING:
2434                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2435                         goto __badfd;
2436         case SNDRV_PCM_STATE_RUNNING:
2437                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2438                         break;
2439                 /* Fall through */
2440         case SNDRV_PCM_STATE_PREPARED:
2441         case SNDRV_PCM_STATE_SUSPENDED:
2442                 err = 0;
2443                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2444                         n = snd_pcm_playback_hw_avail(runtime);
2445                 else
2446                         n = snd_pcm_capture_avail(runtime);
2447                 n += runtime->delay;
2448                 break;
2449         case SNDRV_PCM_STATE_XRUN:
2450                 err = -EPIPE;
2451                 break;
2452         default:
2453               __badfd:
2454                 err = -EBADFD;
2455                 break;
2456         }
2457         snd_pcm_stream_unlock_irq(substream);
2458         if (!err)
2459                 if (put_user(n, res))
2460                         err = -EFAULT;
2461         return err;
2462 }
2463
2464 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2465                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2466 {
2467         struct snd_pcm_runtime *runtime = substream->runtime;
2468         struct snd_pcm_sync_ptr sync_ptr;
2469         volatile struct snd_pcm_mmap_status *status;
2470         volatile struct snd_pcm_mmap_control *control;
2471         int err;
2472
2473         memset(&sync_ptr, 0, sizeof(sync_ptr));
2474         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2475                 return -EFAULT;
2476         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2477                 return -EFAULT;
2478         status = runtime->status;
2479         control = runtime->control;
2480         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2481                 err = snd_pcm_hwsync(substream);
2482                 if (err < 0)
2483                         return err;
2484         }
2485         snd_pcm_stream_lock_irq(substream);
2486         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2487                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2488         else
2489                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2490         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2491                 control->avail_min = sync_ptr.c.control.avail_min;
2492         else
2493                 sync_ptr.c.control.avail_min = control->avail_min;
2494         sync_ptr.s.status.state = status->state;
2495         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2496         sync_ptr.s.status.tstamp = status->tstamp;
2497         sync_ptr.s.status.suspended_state = status->suspended_state;
2498         snd_pcm_stream_unlock_irq(substream);
2499         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2500                 return -EFAULT;
2501         return 0;
2502 }
2503
2504 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2505 {
2506         struct snd_pcm_runtime *runtime = substream->runtime;
2507         int arg;
2508
2509         if (get_user(arg, _arg))
2510                 return -EFAULT;
2511         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2512                 return -EINVAL;
2513         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2514         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2515                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2516         return 0;
2517 }
2518
2519 static int snd_pcm_common_ioctl1(struct file *file,
2520                                  struct snd_pcm_substream *substream,
2521                                  unsigned int cmd, void __user *arg)
2522 {
2523         switch (cmd) {
2524         case SNDRV_PCM_IOCTL_PVERSION:
2525                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2526         case SNDRV_PCM_IOCTL_INFO:
2527                 return snd_pcm_info_user(substream, arg);
2528         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2529                 return 0;
2530         case SNDRV_PCM_IOCTL_TTSTAMP:
2531                 return snd_pcm_tstamp(substream, arg);
2532         case SNDRV_PCM_IOCTL_HW_REFINE:
2533                 return snd_pcm_hw_refine_user(substream, arg);
2534         case SNDRV_PCM_IOCTL_HW_PARAMS:
2535                 return snd_pcm_hw_params_user(substream, arg);
2536         case SNDRV_PCM_IOCTL_HW_FREE:
2537                 return snd_pcm_hw_free(substream);
2538         case SNDRV_PCM_IOCTL_SW_PARAMS:
2539                 return snd_pcm_sw_params_user(substream, arg);
2540         case SNDRV_PCM_IOCTL_STATUS:
2541                 return snd_pcm_status_user(substream, arg);
2542         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2543                 return snd_pcm_channel_info_user(substream, arg);
2544         case SNDRV_PCM_IOCTL_PREPARE:
2545                 return snd_pcm_prepare(substream, file);
2546         case SNDRV_PCM_IOCTL_RESET:
2547                 return snd_pcm_reset(substream);
2548         case SNDRV_PCM_IOCTL_START:
2549                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2550         case SNDRV_PCM_IOCTL_LINK:
2551                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2552         case SNDRV_PCM_IOCTL_UNLINK:
2553                 return snd_pcm_unlink(substream);
2554         case SNDRV_PCM_IOCTL_RESUME:
2555                 return snd_pcm_resume(substream);
2556         case SNDRV_PCM_IOCTL_XRUN:
2557                 return snd_pcm_xrun(substream);
2558         case SNDRV_PCM_IOCTL_HWSYNC:
2559                 return snd_pcm_hwsync(substream);
2560         case SNDRV_PCM_IOCTL_DELAY:
2561                 return snd_pcm_delay(substream, arg);
2562         case SNDRV_PCM_IOCTL_SYNC_PTR:
2563                 return snd_pcm_sync_ptr(substream, arg);
2564 #ifdef CONFIG_SND_SUPPORT_OLD_API
2565         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2566                 return snd_pcm_hw_refine_old_user(substream, arg);
2567         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2568                 return snd_pcm_hw_params_old_user(substream, arg);
2569 #endif
2570         case SNDRV_PCM_IOCTL_DRAIN:
2571                 return snd_pcm_drain(substream, file);
2572         case SNDRV_PCM_IOCTL_DROP:
2573                 return snd_pcm_drop(substream);
2574         case SNDRV_PCM_IOCTL_PAUSE:
2575         {
2576                 int res;
2577                 snd_pcm_stream_lock_irq(substream);
2578                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2579                 snd_pcm_stream_unlock_irq(substream);
2580                 return res;
2581         }
2582         }
2583         snd_printd("unknown ioctl = 0x%x\n", cmd);
2584         return -ENOTTY;
2585 }
2586
2587 static int snd_pcm_playback_ioctl1(struct file *file,
2588                                    struct snd_pcm_substream *substream,
2589                                    unsigned int cmd, void __user *arg)
2590 {
2591         if (snd_BUG_ON(!substream))
2592                 return -ENXIO;
2593         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2594                 return -EINVAL;
2595         switch (cmd) {
2596         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2597         {
2598                 struct snd_xferi xferi;
2599                 struct snd_xferi __user *_xferi = arg;
2600                 struct snd_pcm_runtime *runtime = substream->runtime;
2601                 snd_pcm_sframes_t result;
2602                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2603                         return -EBADFD;
2604                 if (put_user(0, &_xferi->result))
2605                         return -EFAULT;
2606                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2607                         return -EFAULT;
2608                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2609                 __put_user(result, &_xferi->result);
2610                 return result < 0 ? result : 0;
2611         }
2612         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2613         {
2614                 struct snd_xfern xfern;
2615                 struct snd_xfern __user *_xfern = arg;
2616                 struct snd_pcm_runtime *runtime = substream->runtime;
2617                 void __user **bufs;
2618                 snd_pcm_sframes_t result;
2619                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2620                         return -EBADFD;
2621                 if (runtime->channels > 128)
2622                         return -EINVAL;
2623                 if (put_user(0, &_xfern->result))
2624                         return -EFAULT;
2625                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2626                         return -EFAULT;
2627
2628                 bufs = memdup_user(xfern.bufs,
2629                                    sizeof(void *) * runtime->channels);
2630                 if (IS_ERR(bufs))
2631                         return PTR_ERR(bufs);
2632                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2633                 kfree(bufs);
2634                 __put_user(result, &_xfern->result);
2635                 return result < 0 ? result : 0;
2636         }
2637         case SNDRV_PCM_IOCTL_REWIND:
2638         {
2639                 snd_pcm_uframes_t frames;
2640                 snd_pcm_uframes_t __user *_frames = arg;
2641                 snd_pcm_sframes_t result;
2642                 if (get_user(frames, _frames))
2643                         return -EFAULT;
2644                 if (put_user(0, _frames))
2645                         return -EFAULT;
2646                 result = snd_pcm_playback_rewind(substream, frames);
2647                 __put_user(result, _frames);
2648                 return result < 0 ? result : 0;
2649         }
2650         case SNDRV_PCM_IOCTL_FORWARD:
2651         {
2652                 snd_pcm_uframes_t frames;
2653                 snd_pcm_uframes_t __user *_frames = arg;
2654                 snd_pcm_sframes_t result;
2655                 if (get_user(frames, _frames))
2656                         return -EFAULT;
2657                 if (put_user(0, _frames))
2658                         return -EFAULT;
2659                 result = snd_pcm_playback_forward(substream, frames);
2660                 __put_user(result, _frames);
2661                 return result < 0 ? result : 0;
2662         }
2663         }
2664         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2665 }
2666
2667 static int snd_pcm_capture_ioctl1(struct file *file,
2668                                   struct snd_pcm_substream *substream,
2669                                   unsigned int cmd, void __user *arg)
2670 {
2671         if (snd_BUG_ON(!substream))
2672                 return -ENXIO;
2673         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2674                 return -EINVAL;
2675         switch (cmd) {
2676         case SNDRV_PCM_IOCTL_READI_FRAMES:
2677         {
2678                 struct snd_xferi xferi;
2679                 struct snd_xferi __user *_xferi = arg;
2680                 struct snd_pcm_runtime *runtime = substream->runtime;
2681                 snd_pcm_sframes_t result;
2682                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2683                         return -EBADFD;
2684                 if (put_user(0, &_xferi->result))
2685                         return -EFAULT;
2686                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2687                         return -EFAULT;
2688                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2689                 __put_user(result, &_xferi->result);
2690                 return result < 0 ? result : 0;
2691         }
2692         case SNDRV_PCM_IOCTL_READN_FRAMES:
2693         {
2694                 struct snd_xfern xfern;
2695                 struct snd_xfern __user *_xfern = arg;
2696                 struct snd_pcm_runtime *runtime = substream->runtime;
2697                 void *bufs;
2698                 snd_pcm_sframes_t result;
2699                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2700                         return -EBADFD;
2701                 if (runtime->channels > 128)
2702                         return -EINVAL;
2703                 if (put_user(0, &_xfern->result))
2704                         return -EFAULT;
2705                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2706                         return -EFAULT;
2707
2708                 bufs = memdup_user(xfern.bufs,
2709                                    sizeof(void *) * runtime->channels);
2710                 if (IS_ERR(bufs))
2711                         return PTR_ERR(bufs);
2712                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2713                 kfree(bufs);
2714                 __put_user(result, &_xfern->result);
2715                 return result < 0 ? result : 0;
2716         }
2717         case SNDRV_PCM_IOCTL_REWIND:
2718         {
2719                 snd_pcm_uframes_t frames;
2720                 snd_pcm_uframes_t __user *_frames = arg;
2721                 snd_pcm_sframes_t result;
2722                 if (get_user(frames, _frames))
2723                         return -EFAULT;
2724                 if (put_user(0, _frames))
2725                         return -EFAULT;
2726                 result = snd_pcm_capture_rewind(substream, frames);
2727                 __put_user(result, _frames);
2728                 return result < 0 ? result : 0;
2729         }
2730         case SNDRV_PCM_IOCTL_FORWARD:
2731         {
2732                 snd_pcm_uframes_t frames;
2733                 snd_pcm_uframes_t __user *_frames = arg;
2734                 snd_pcm_sframes_t result;
2735                 if (get_user(frames, _frames))
2736                         return -EFAULT;
2737                 if (put_user(0, _frames))
2738                         return -EFAULT;
2739                 result = snd_pcm_capture_forward(substream, frames);
2740                 __put_user(result, _frames);
2741                 return result < 0 ? result : 0;
2742         }
2743         }
2744         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2745 }
2746
2747 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2748                                    unsigned long arg)
2749 {
2750         struct snd_pcm_file *pcm_file;
2751
2752         pcm_file = file->private_data;
2753
2754         if (((cmd >> 8) & 0xff) != 'A')
2755                 return -ENOTTY;
2756
2757         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2758                                        (void __user *)arg);
2759 }
2760
2761 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2762                                   unsigned long arg)
2763 {
2764         struct snd_pcm_file *pcm_file;
2765
2766         pcm_file = file->private_data;
2767
2768         if (((cmd >> 8) & 0xff) != 'A')
2769                 return -ENOTTY;
2770
2771         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2772                                       (void __user *)arg);
2773 }
2774
2775 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2776                          unsigned int cmd, void *arg)
2777 {
2778         mm_segment_t fs;
2779         int result;
2780
2781         fs = snd_enter_user();
2782         switch (substream->stream) {
2783         case SNDRV_PCM_STREAM_PLAYBACK:
2784                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2785                                                  (void __user *)arg);
2786                 break;
2787         case SNDRV_PCM_STREAM_CAPTURE:
2788                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2789                                                 (void __user *)arg);
2790                 break;
2791         default:
2792                 result = -EINVAL;
2793                 break;
2794         }
2795         snd_leave_user(fs);
2796         return result;
2797 }
2798
2799 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2800
2801 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2802                             loff_t * offset)
2803 {
2804         struct snd_pcm_file *pcm_file;
2805         struct snd_pcm_substream *substream;
2806         struct snd_pcm_runtime *runtime;
2807         snd_pcm_sframes_t result;
2808
2809         pcm_file = file->private_data;
2810         substream = pcm_file->substream;
2811         if (PCM_RUNTIME_CHECK(substream))
2812                 return -ENXIO;
2813         runtime = substream->runtime;
2814         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2815                 return -EBADFD;
2816         if (!frame_aligned(runtime, count))
2817                 return -EINVAL;
2818         count = bytes_to_frames(runtime, count);
2819         result = snd_pcm_lib_read(substream, buf, count);
2820         if (result > 0)
2821                 result = frames_to_bytes(runtime, result);
2822         return result;
2823 }
2824
2825 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2826                              size_t count, loff_t * offset)
2827 {
2828         struct snd_pcm_file *pcm_file;
2829         struct snd_pcm_substream *substream;
2830         struct snd_pcm_runtime *runtime;
2831         snd_pcm_sframes_t result;
2832
2833         pcm_file = file->private_data;
2834         substream = pcm_file->substream;
2835         if (PCM_RUNTIME_CHECK(substream))
2836                 return -ENXIO;
2837         runtime = substream->runtime;
2838         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2839                 return -EBADFD;
2840         if (!frame_aligned(runtime, count))
2841                 return -EINVAL;
2842         count = bytes_to_frames(runtime, count);
2843         result = snd_pcm_lib_write(substream, buf, count);
2844         if (result > 0)
2845                 result = frames_to_bytes(runtime, result);
2846         return result;
2847 }
2848
2849 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2850                              unsigned long nr_segs, loff_t pos)
2851
2852 {
2853         struct snd_pcm_file *pcm_file;
2854         struct snd_pcm_substream *substream;
2855         struct snd_pcm_runtime *runtime;
2856         snd_pcm_sframes_t result;
2857         unsigned long i;
2858         void __user **bufs;
2859         snd_pcm_uframes_t frames;
2860
2861         pcm_file = iocb->ki_filp->private_data;
2862         substream = pcm_file->substream;
2863         if (PCM_RUNTIME_CHECK(substream))
2864                 return -ENXIO;
2865         runtime = substream->runtime;
2866         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2867                 return -EBADFD;
2868         if (nr_segs > 1024 || nr_segs != runtime->channels)
2869                 return -EINVAL;
2870         if (!frame_aligned(runtime, iov->iov_len))
2871                 return -EINVAL;
2872         frames = bytes_to_samples(runtime, iov->iov_len);
2873         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2874         if (bufs == NULL)
2875                 return -ENOMEM;
2876         for (i = 0; i < nr_segs; ++i)
2877                 bufs[i] = iov[i].iov_base;
2878         result = snd_pcm_lib_readv(substream, bufs, frames);
2879         if (result > 0)
2880                 result = frames_to_bytes(runtime, result);
2881         kfree(bufs);
2882         return result;
2883 }
2884
2885 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2886                               unsigned long nr_segs, loff_t pos)
2887 {
2888         struct snd_pcm_file *pcm_file;
2889         struct snd_pcm_substream *substream;
2890         struct snd_pcm_runtime *runtime;
2891         snd_pcm_sframes_t result;
2892         unsigned long i;
2893         void __user **bufs;
2894         snd_pcm_uframes_t frames;
2895
2896         pcm_file = iocb->ki_filp->private_data;
2897         substream = pcm_file->substream;
2898         if (PCM_RUNTIME_CHECK(substream))
2899                 return -ENXIO;
2900         runtime = substream->runtime;
2901         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2902                 return -EBADFD;
2903         if (nr_segs > 128 || nr_segs != runtime->channels ||
2904             !frame_aligned(runtime, iov->iov_len))
2905                 return -EINVAL;
2906         frames = bytes_to_samples(runtime, iov->iov_len);
2907         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2908         if (bufs == NULL)
2909                 return -ENOMEM;
2910         for (i = 0; i < nr_segs; ++i)
2911                 bufs[i] = iov[i].iov_base;
2912         result = snd_pcm_lib_writev(substream, bufs, frames);
2913         if (result > 0)
2914                 result = frames_to_bytes(runtime, result);
2915         kfree(bufs);
2916         return result;
2917 }
2918
2919 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2920 {
2921         struct snd_pcm_file *pcm_file;
2922         struct snd_pcm_substream *substream;
2923         struct snd_pcm_runtime *runtime;
2924         unsigned int mask;
2925         snd_pcm_uframes_t avail;
2926
2927         pcm_file = file->private_data;
2928
2929         substream = pcm_file->substream;
2930         if (PCM_RUNTIME_CHECK(substream))
2931                 return -ENXIO;
2932         runtime = substream->runtime;
2933
2934         poll_wait(file, &runtime->sleep, wait);
2935
2936         snd_pcm_stream_lock_irq(substream);
2937         avail = snd_pcm_playback_avail(runtime);
2938         switch (runtime->status->state) {
2939         case SNDRV_PCM_STATE_RUNNING:
2940         case SNDRV_PCM_STATE_PREPARED:
2941         case SNDRV_PCM_STATE_PAUSED:
2942                 if (avail >= runtime->control->avail_min) {
2943                         mask = POLLOUT | POLLWRNORM;
2944                         break;
2945                 }
2946                 /* Fall through */
2947         case SNDRV_PCM_STATE_DRAINING:
2948                 mask = 0;
2949                 break;
2950         default:
2951                 mask = POLLOUT | POLLWRNORM | POLLERR;
2952                 break;
2953         }
2954         snd_pcm_stream_unlock_irq(substream);
2955         return mask;
2956 }
2957
2958 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2959 {
2960         struct snd_pcm_file *pcm_file;
2961         struct snd_pcm_substream *substream;
2962         struct snd_pcm_runtime *runtime;
2963         unsigned int mask;
2964         snd_pcm_uframes_t avail;
2965
2966         pcm_file = file->private_data;
2967
2968         substream = pcm_file->substream;
2969         if (PCM_RUNTIME_CHECK(substream))
2970                 return -ENXIO;
2971         runtime = substream->runtime;
2972
2973         poll_wait(file, &runtime->sleep, wait);
2974
2975         snd_pcm_stream_lock_irq(substream);
2976         avail = snd_pcm_capture_avail(runtime);
2977         switch (runtime->status->state) {
2978         case SNDRV_PCM_STATE_RUNNING:
2979         case SNDRV_PCM_STATE_PREPARED:
2980         case SNDRV_PCM_STATE_PAUSED:
2981                 if (avail >= runtime->control->avail_min) {
2982                         mask = POLLIN | POLLRDNORM;
2983                         break;
2984                 }
2985                 mask = 0;
2986                 break;
2987         case SNDRV_PCM_STATE_DRAINING:
2988                 if (avail > 0) {
2989                         mask = POLLIN | POLLRDNORM;
2990                         break;
2991                 }
2992                 /* Fall through */
2993         default:
2994                 mask = POLLIN | POLLRDNORM | POLLERR;
2995                 break;
2996         }
2997         snd_pcm_stream_unlock_irq(substream);
2998         return mask;
2999 }
3000
3001 /*
3002  * mmap support
3003  */
3004
3005 /*
3006  * Only on coherent architectures, we can mmap the status and the control records
3007  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3008  */
3009 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3010 /*
3011  * mmap status record
3012  */
3013 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3014                                                 struct vm_fault *vmf)
3015 {
3016         struct snd_pcm_substream *substream = area->vm_private_data;
3017         struct snd_pcm_runtime *runtime;
3018
3019         if (substream == NULL)
3020                 return VM_FAULT_SIGBUS;
3021         runtime = substream->runtime;
3022         vmf->page = virt_to_page(runtime->status);
3023         get_page(vmf->page);
3024         return 0;
3025 }
3026
3027 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3028 {
3029         .fault =        snd_pcm_mmap_status_fault,
3030 };
3031
3032 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3033                                struct vm_area_struct *area)
3034 {
3035         struct snd_pcm_runtime *runtime;
3036         long size;
3037         if (!(area->vm_flags & VM_READ))
3038                 return -EINVAL;
3039         runtime = substream->runtime;
3040         size = area->vm_end - area->vm_start;
3041         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3042                 return -EINVAL;
3043         area->vm_ops = &snd_pcm_vm_ops_status;
3044         area->vm_private_data = substream;
3045         area->vm_flags |= VM_RESERVED;
3046         return 0;
3047 }
3048
3049 /*
3050  * mmap control record
3051  */
3052 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3053                                                 struct vm_fault *vmf)
3054 {
3055         struct snd_pcm_substream *substream = area->vm_private_data;
3056         struct snd_pcm_runtime *runtime;
3057
3058         if (substream == NULL)
3059                 return VM_FAULT_SIGBUS;
3060         runtime = substream->runtime;
3061         vmf->page = virt_to_page(runtime->control);
3062         get_page(vmf->page);
3063         return 0;
3064 }
3065
3066 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3067 {
3068         .fault =        snd_pcm_mmap_control_fault,
3069 };
3070
3071 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3072                                 struct vm_area_struct *area)
3073 {
3074         struct snd_pcm_runtime *runtime;
3075         long size;
3076         if (!(area->vm_flags & VM_READ))
3077                 return -EINVAL;
3078         runtime = substream->runtime;
3079         size = area->vm_end - area->vm_start;
3080         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3081                 return -EINVAL;
3082         area->vm_ops = &snd_pcm_vm_ops_control;
3083         area->vm_private_data = substream;
3084         area->vm_flags |= VM_RESERVED;
3085         return 0;
3086 }
3087 #else /* ! coherent mmap */
3088 /*
3089  * don't support mmap for status and control records.
3090  */
3091 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3092                                struct vm_area_struct *area)
3093 {
3094         return -ENXIO;
3095 }
3096 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3097                                 struct vm_area_struct *area)
3098 {
3099         return -ENXIO;
3100 }
3101 #endif /* coherent mmap */
3102
3103 static inline struct page *
3104 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3105 {
3106         void *vaddr = substream->runtime->dma_area + ofs;
3107 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3108         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3109                 return virt_to_page(CAC_ADDR(vaddr));
3110 #endif
3111 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3112         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3113                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3114                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3115                 /* assume dma_handle set via pfn_to_phys() in
3116                  * mm/dma-noncoherent.c
3117                  */
3118                 return pfn_to_page(addr >> PAGE_SHIFT);
3119         }
3120 #endif
3121         return virt_to_page(vaddr);
3122 }
3123
3124 /*
3125  * fault callback for mmapping a RAM page
3126  */
3127 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3128                                                 struct vm_fault *vmf)
3129 {
3130         struct snd_pcm_substream *substream = area->vm_private_data;
3131         struct snd_pcm_runtime *runtime;
3132         unsigned long offset;
3133         struct page * page;
3134         size_t dma_bytes;
3135
3136         if (substream == NULL)
3137                 return VM_FAULT_SIGBUS;
3138         runtime = substream->runtime;
3139         offset = vmf->pgoff << PAGE_SHIFT;
3140         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3141         if (offset > dma_bytes - PAGE_SIZE)
3142                 return VM_FAULT_SIGBUS;
3143         if (substream->ops->page)
3144                 page = substream->ops->page(substream, offset);
3145         else
3146                 page = snd_pcm_default_page_ops(substream, offset);
3147         if (!page)
3148                 return VM_FAULT_SIGBUS;
3149         get_page(page);
3150         vmf->page = page;
3151         return 0;
3152 }
3153
3154 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3155         .open =         snd_pcm_mmap_data_open,
3156         .close =        snd_pcm_mmap_data_close,
3157 };
3158
3159 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3160         .open =         snd_pcm_mmap_data_open,
3161         .close =        snd_pcm_mmap_data_close,
3162         .fault =        snd_pcm_mmap_data_fault,
3163 };
3164
3165 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3166 /* This should be defined / handled globally! */
3167 #ifdef CONFIG_ARM
3168 #define ARCH_HAS_DMA_MMAP_COHERENT
3169 #endif
3170 #endif
3171
3172 /*
3173  * mmap the DMA buffer on RAM
3174  */
3175 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3176                                 struct vm_area_struct *area)
3177 {
3178         area->vm_flags |= VM_RESERVED;
3179 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3180         if (!substream->ops->page &&
3181             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3182                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3183                                          area,
3184                                          substream->runtime->dma_area,
3185                                          substream->runtime->dma_addr,
3186                                          area->vm_end - area->vm_start);
3187 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3188         /* mmap with fault handler */
3189         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3190         return 0;
3191 }
3192
3193 /*
3194  * mmap the DMA buffer on I/O memory area
3195  */
3196 #if SNDRV_PCM_INFO_MMAP_IOMEM
3197 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3198                            struct vm_area_struct *area)
3199 {
3200         long size;
3201         unsigned long offset;
3202
3203         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3204         area->vm_flags |= VM_IO;
3205         size = area->vm_end - area->vm_start;
3206         offset = area->vm_pgoff << PAGE_SHIFT;
3207         if (io_remap_pfn_range(area, area->vm_start,
3208                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3209                                 size, area->vm_page_prot))
3210                 return -EAGAIN;
3211         return 0;
3212 }
3213
3214 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3215 #endif /* SNDRV_PCM_INFO_MMAP */
3216
3217 /* mmap callback with pgprot_noncached */
3218 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3219                                struct vm_area_struct *area)
3220 {
3221         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3222         return snd_pcm_default_mmap(substream, area);
3223 }
3224 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3225
3226 /*
3227  * mmap DMA buffer
3228  */
3229 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3230                       struct vm_area_struct *area)
3231 {
3232         struct snd_pcm_runtime *runtime;
3233         long size;
3234         unsigned long offset;
3235         size_t dma_bytes;
3236         int err;
3237
3238         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3239                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3240                         return -EINVAL;
3241         } else {
3242                 if (!(area->vm_flags & VM_READ))
3243                         return -EINVAL;
3244         }
3245         runtime = substream->runtime;
3246         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3247                 return -EBADFD;
3248         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3249                 return -ENXIO;
3250         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3251             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3252                 return -EINVAL;
3253         size = area->vm_end - area->vm_start;
3254         offset = area->vm_pgoff << PAGE_SHIFT;
3255         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3256         if ((size_t)size > dma_bytes)
3257                 return -EINVAL;
3258         if (offset > dma_bytes - size)
3259                 return -EINVAL;
3260
3261         area->vm_ops = &snd_pcm_vm_ops_data;
3262         area->vm_private_data = substream;
3263         if (substream->ops->mmap)
3264                 err = substream->ops->mmap(substream, area);
3265         else
3266                 err = snd_pcm_default_mmap(substream, area);
3267         if (!err)
3268                 atomic_inc(&substream->mmap_count);
3269         return err;
3270 }
3271
3272 EXPORT_SYMBOL(snd_pcm_mmap_data);
3273
3274 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3275 {
3276         struct snd_pcm_file * pcm_file;
3277         struct snd_pcm_substream *substream;
3278         unsigned long offset;
3279
3280         pcm_file = file->private_data;
3281         substream = pcm_file->substream;
3282         if (PCM_RUNTIME_CHECK(substream))
3283                 return -ENXIO;
3284
3285         offset = area->vm_pgoff << PAGE_SHIFT;
3286         switch (offset) {
3287         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3288                 if (pcm_file->no_compat_mmap)
3289                         return -ENXIO;
3290                 return snd_pcm_mmap_status(substream, file, area);
3291         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3292                 if (pcm_file->no_compat_mmap)
3293                         return -ENXIO;
3294                 return snd_pcm_mmap_control(substream, file, area);
3295         default:
3296                 return snd_pcm_mmap_data(substream, file, area);
3297         }
3298         return 0;
3299 }
3300
3301 static int snd_pcm_fasync(int fd, struct file * file, int on)
3302 {
3303         struct snd_pcm_file * pcm_file;
3304         struct snd_pcm_substream *substream;
3305         struct snd_pcm_runtime *runtime;
3306         int err = -ENXIO;
3307
3308         lock_kernel();
3309         pcm_file = file->private_data;
3310         substream = pcm_file->substream;
3311         if (PCM_RUNTIME_CHECK(substream))
3312                 goto out;
3313         runtime = substream->runtime;
3314         err = fasync_helper(fd, file, on, &runtime->fasync);
3315 out:
3316         unlock_kernel();
3317         return err;
3318 }
3319
3320 /*
3321  * ioctl32 compat
3322  */
3323 #ifdef CONFIG_COMPAT
3324 #include "pcm_compat.c"
3325 #else
3326 #define snd_pcm_ioctl_compat    NULL
3327 #endif
3328
3329 /*
3330  *  To be removed helpers to keep binary compatibility
3331  */
3332
3333 #ifdef CONFIG_SND_SUPPORT_OLD_API
3334 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3335 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3336
3337 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3338                                                struct snd_pcm_hw_params_old *oparams)
3339 {
3340         unsigned int i;
3341
3342         memset(params, 0, sizeof(*params));
3343         params->flags = oparams->flags;
3344         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3345                 params->masks[i].bits[0] = oparams->masks[i];
3346         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3347         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3348         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3349         params->info = oparams->info;
3350         params->msbits = oparams->msbits;
3351         params->rate_num = oparams->rate_num;
3352         params->rate_den = oparams->rate_den;
3353         params->fifo_size = oparams->fifo_size;
3354 }
3355
3356 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3357                                              struct snd_pcm_hw_params *params)
3358 {
3359         unsigned int i;
3360
3361         memset(oparams, 0, sizeof(*oparams));
3362         oparams->flags = params->flags;
3363         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3364                 oparams->masks[i] = params->masks[i].bits[0];
3365         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3366         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3367         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3368         oparams->info = params->info;
3369         oparams->msbits = params->msbits;
3370         oparams->rate_num = params->rate_num;
3371         oparams->rate_den = params->rate_den;
3372         oparams->fifo_size = params->fifo_size;
3373 }
3374
3375 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3376                                       struct snd_pcm_hw_params_old __user * _oparams)
3377 {
3378         struct snd_pcm_hw_params *params;
3379         struct snd_pcm_hw_params_old *oparams = NULL;
3380         int err;
3381
3382         params = kmalloc(sizeof(*params), GFP_KERNEL);
3383         if (!params)
3384                 return -ENOMEM;
3385
3386         oparams = memdup_user(_oparams, sizeof(*oparams));
3387         if (IS_ERR(oparams)) {
3388                 err = PTR_ERR(oparams);
3389                 goto out;
3390         }
3391         snd_pcm_hw_convert_from_old_params(params, oparams);
3392         err = snd_pcm_hw_refine(substream, params);
3393         snd_pcm_hw_convert_to_old_params(oparams, params);
3394         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3395                 if (!err)
3396                         err = -EFAULT;
3397         }
3398
3399         kfree(oparams);
3400 out:
3401         kfree(params);
3402         return err;
3403 }
3404
3405 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3406                                       struct snd_pcm_hw_params_old __user * _oparams)
3407 {
3408         struct snd_pcm_hw_params *params;
3409         struct snd_pcm_hw_params_old *oparams = NULL;
3410         int err;
3411
3412         params = kmalloc(sizeof(*params), GFP_KERNEL);
3413         if (!params)
3414                 return -ENOMEM;
3415
3416         oparams = memdup_user(_oparams, sizeof(*oparams));
3417         if (IS_ERR(oparams)) {
3418                 err = PTR_ERR(oparams);
3419                 goto out;
3420         }
3421         snd_pcm_hw_convert_from_old_params(params, oparams);
3422         err = snd_pcm_hw_params(substream, params);
3423         snd_pcm_hw_convert_to_old_params(oparams, params);
3424         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3425                 if (!err)
3426                         err = -EFAULT;
3427         }
3428
3429         kfree(oparams);
3430 out:
3431         kfree(params);
3432         return err;
3433 }
3434 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3435
3436 #ifndef CONFIG_MMU
3437 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3438                                       unsigned long len, unsigned long pgoff,
3439                                       unsigned long flags)
3440 {
3441         return 0;
3442 }
3443 #else
3444 # define dummy_get_unmapped_area NULL
3445 #endif
3446
3447 /*
3448  *  Register section
3449  */
3450
3451 const struct file_operations snd_pcm_f_ops[2] = {
3452         {
3453                 .owner =                THIS_MODULE,
3454                 .write =                snd_pcm_write,
3455                 .aio_write =            snd_pcm_aio_write,
3456                 .open =                 snd_pcm_playback_open,
3457                 .release =              snd_pcm_release,
3458                 .poll =                 snd_pcm_playback_poll,
3459                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3460                 .compat_ioctl =         snd_pcm_ioctl_compat,
3461                 .mmap =                 snd_pcm_mmap,
3462                 .fasync =               snd_pcm_fasync,
3463                 .get_unmapped_area =    dummy_get_unmapped_area,
3464         },
3465         {
3466                 .owner =                THIS_MODULE,
3467                 .read =                 snd_pcm_read,
3468                 .aio_read =             snd_pcm_aio_read,
3469                 .open =                 snd_pcm_capture_open,
3470                 .release =              snd_pcm_release,
3471                 .poll =                 snd_pcm_capture_poll,
3472                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3473                 .compat_ioctl =         snd_pcm_ioctl_compat,
3474                 .mmap =                 snd_pcm_mmap,
3475                 .fasync =               snd_pcm_fasync,
3476                 .get_unmapped_area =    dummy_get_unmapped_area,
3477         }
3478 };