sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos_params.h>
  28 #include <linux/uio.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/math64.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/timer.h>
  37 #include <sound/minors.h>
  38 #include <asm/io.h>
  39 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
  40 #include <dma-coherence.h>
  41 #endif
  42
  43 /*
  44  *  Compatibility
  45  */
  46
  47 struct snd_pcm_hw_params_old {
  48         unsigned int flags;
  49         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  50                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  51         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  52                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  53         unsigned int rmask;
  54         unsigned int cmask;
  55         unsigned int info;
  56         unsigned int msbits;
  57         unsigned int rate_num;
  58         unsigned int rate_den;
  59         snd_pcm_uframes_t fifo_size;
  60         unsigned char reserved[64];
  61 };
  62
  63 #ifdef CONFIG_SND_SUPPORT_OLD_API
  64 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  65 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  66
  67 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  68                                       struct snd_pcm_hw_params_old __user * _oparams);
  69 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  70                                       struct snd_pcm_hw_params_old __user * _oparams);
  71 #endif
  72 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  73
  74 /*
  75  *
  76  */
  77
  78 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  79 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  80
  81 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  82
  83 static inline mm_segment_t snd_enter_user(void)
  84 {
  85         mm_segment_t fs = get_fs();
  86         set_fs(get_ds());
  87         return fs;
  88 }
  89
  90 static inline void snd_leave_user(mm_segment_t fs)
  91 {
  92         set_fs(fs);
  93 }
  94
  95
  96
  97 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  98 {
  99         struct snd_pcm_runtime *runtime;
 100         struct snd_pcm *pcm = substream->pcm;
 101         struct snd_pcm_str *pstr = substream->pstr;
 102
 103         memset(info, 0, sizeof(*info));
 104         info->card = pcm->card->number;
 105         info->device = pcm->device;
 106         info->stream = substream->stream;
 107         info->subdevice = substream->number;
 108         strlcpy(info->id, pcm->id, sizeof(info->id));
 109         strlcpy(info->name, pcm->name, sizeof(info->name));
 110         info->dev_class = pcm->dev_class;
 111         info->dev_subclass = pcm->dev_subclass;
 112         info->subdevices_count = pstr->substream_count;
 113         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 114         strlcpy(info->subname, substream->name, sizeof(info->subname));
 115         runtime = substream->runtime;
 116         /* AB: FIXME!!! This is definitely nonsense */
 117         if (runtime) {
 118                 info->sync = runtime->sync;
 119                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 120         }
 121         return 0;
 122 }
 123
 124 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 125                       struct snd_pcm_info __user * _info)
 126 {
 127         struct snd_pcm_info *info;
 128         int err;
 129
 130         info = kmalloc(sizeof(*info), GFP_KERNEL);
 131         if (! info)
 132                 return -ENOMEM;
 133         err = snd_pcm_info(substream, info);
 134         if (err >= 0) {
 135                 if (copy_to_user(_info, info, sizeof(*info)))
 136                         err = -EFAULT;
 137         }
 138         kfree(info);
 139         return err;
 140 }
 141
 142 #undef RULES_DEBUG
 143
 144 #ifdef RULES_DEBUG
 145 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 146 char *snd_pcm_hw_param_names[] = {
 147         HW_PARAM(ACCESS),
 148         HW_PARAM(FORMAT),
 149         HW_PARAM(SUBFORMAT),
 150         HW_PARAM(SAMPLE_BITS),
 151         HW_PARAM(FRAME_BITS),
 152         HW_PARAM(CHANNELS),
 153         HW_PARAM(RATE),
 154         HW_PARAM(PERIOD_TIME),
 155         HW_PARAM(PERIOD_SIZE),
 156         HW_PARAM(PERIOD_BYTES),
 157         HW_PARAM(PERIODS),
 158         HW_PARAM(BUFFER_TIME),
 159         HW_PARAM(BUFFER_SIZE),
 160         HW_PARAM(BUFFER_BYTES),
 161         HW_PARAM(TICK_TIME),
 162 };
 163 #endif
 164
 165 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 166                       struct snd_pcm_hw_params *params)
 167 {
 168         unsigned int k;
 169         struct snd_pcm_hardware *hw;
 170         struct snd_interval *i = NULL;
 171         struct snd_mask *m = NULL;
 172         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 173         unsigned int rstamps[constrs->rules_num];
 174         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 175         unsigned int stamp = 2;
 176         int changed, again;
 177
 178         params->info = 0;
 179         params->fifo_size = 0;
 180         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 181                 params->msbits = 0;
 182         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 183                 params->rate_num = 0;
 184                 params->rate_den = 0;
 185         }
 186
 187         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 188                 m = hw_param_mask(params, k);
 189                 if (snd_mask_empty(m))
 190                         return -EINVAL;
 191                 if (!(params->rmask & (1 << k)))
 192                         continue;
 193 #ifdef RULES_DEBUG
 194                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 195                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 196 #endif
 197                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 198 #ifdef RULES_DEBUG
 199                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 200 #endif
 201                 if (changed)
 202                         params->cmask |= 1 << k;
 203                 if (changed < 0)
 204                         return changed;
 205         }
 206
 207         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 208                 i = hw_param_interval(params, k);
 209                 if (snd_interval_empty(i))
 210                         return -EINVAL;
 211                 if (!(params->rmask & (1 << k)))
 212                         continue;
 213 #ifdef RULES_DEBUG
 214                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 215                 if (i->empty)
 216                         printk("empty");
 217                 else
 218                         printk("%c%u %u%c",
 219                                i->openmin ? '(' : '[', i->min,
 220                                i->max, i->openmax ? ')' : ']');
 221                 printk(" -> ");
 222 #endif
 223                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 224 #ifdef RULES_DEBUG
 225                 if (i->empty)
 226                         printk("empty\n");
 227                 else
 228                         printk("%c%u %u%c\n",
 229                                i->openmin ? '(' : '[', i->min,
 230                                i->max, i->openmax ? ')' : ']');
 231 #endif
 232                 if (changed)
 233                         params->cmask |= 1 << k;
 234                 if (changed < 0)
 235                         return changed;
 236         }
 237
 238         for (k = 0; k < constrs->rules_num; k++)
 239                 rstamps[k] = 0;
 240         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 241                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 242         do {
 243                 again = 0;
 244                 for (k = 0; k < constrs->rules_num; k++) {
 245                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 246                         unsigned int d;
 247                         int doit = 0;
 248                         if (r->cond && !(r->cond & params->flags))
 249                                 continue;
 250                         for (d = 0; r->deps[d] >= 0; d++) {
 251                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 252                                         doit = 1;
 253                                         break;
 254                                 }
 255                         }
 256                         if (!doit)
 257                                 continue;
 258 #ifdef RULES_DEBUG
 259                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 260                         if (r->var >= 0) {
 261                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 262                                 if (hw_is_mask(r->var)) {
 263                                         m = hw_param_mask(params, r->var);
 264                                         printk("%x", *m->bits);
 265                                 } else {
 266                                         i = hw_param_interval(params, r->var);
 267                                         if (i->empty)
 268                                                 printk("empty");
 269                                         else
 270                                                 printk("%c%u %u%c",
 271                                                        i->openmin ? '(' : '[', i->min,
 272                                                        i->max, i->openmax ? ')' : ']');
 273                                 }
 274                         }
 275 #endif
 276                         changed = r->func(params, r);
 277 #ifdef RULES_DEBUG
 278                         if (r->var >= 0) {
 279                                 printk(" -> ");
 280                                 if (hw_is_mask(r->var))
 281                                         printk("%x", *m->bits);
 282                                 else {
 283                                         if (i->empty)
 284                                                 printk("empty");
 285                                         else
 286                                                 printk("%c%u %u%c",
 287                                                        i->openmin ? '(' : '[', i->min,
 288                                                        i->max, i->openmax ? ')' : ']');
 289                                 }
 290                         }
 291                         printk("\n");
 292 #endif
 293                         rstamps[k] = stamp;
 294                         if (changed && r->var >= 0) {
 295                                 params->cmask |= (1 << r->var);
 296                                 vstamps[r->var] = stamp;
 297                                 again = 1;
 298                         }
 299                         if (changed < 0)
 300                                 return changed;
 301                         stamp++;
 302                 }
 303         } while (again);
 304         if (!params->msbits) {
 305                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 306                 if (snd_interval_single(i))
 307                         params->msbits = snd_interval_value(i);
 308         }
 309
 310         if (!params->rate_den) {
 311                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 312                 if (snd_interval_single(i)) {
 313                         params->rate_num = snd_interval_value(i);
 314                         params->rate_den = 1;
 315                 }
 316         }
 317
 318         hw = &substream->runtime->hw;
 319         if (!params->info)
 320                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 321         if (!params->fifo_size) {
 322                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 323                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 324                 if (snd_mask_min(m) == snd_mask_max(m) &&
 325                     snd_interval_min(i) == snd_interval_max(i)) {
 326                         changed = substream->ops->ioctl(substream,
 327                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 328                         if (changed < 0)
 329                                 return changed;
 330                 }
 331         }
 332         params->rmask = 0;
 333         return 0;
 334 }
 335
 336 EXPORT_SYMBOL(snd_pcm_hw_refine);
 337
 338 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 339                                   struct snd_pcm_hw_params __user * _params)
 340 {
 341         struct snd_pcm_hw_params *params;
 342         int err;
 343
 344         params = memdup_user(_params, sizeof(*params));
 345         if (IS_ERR(params))
 346                 return PTR_ERR(params);
 347
 348         err = snd_pcm_hw_refine(substream, params);
 349         if (copy_to_user(_params, params, sizeof(*params))) {
 350                 if (!err)
 351                         err = -EFAULT;
 352         }
 353
 354         kfree(params);
 355         return err;
 356 }
 357
 358 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 359 {
 360         int usecs;
 361
 362         if (! runtime->rate)
 363                 return -1; /* invalid */
 364
 365         /* take 75% of period time as the deadline */
 366         usecs = (750000 / runtime->rate) * runtime->period_size;
 367         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 368                 runtime->rate;
 369
 370         return usecs;
 371 }
 372
 373 static int calc_boundary(struct snd_pcm_runtime *runtime)
 374 {
 375         u_int64_t boundary;
 376
 377         boundary = (u_int64_t)runtime->buffer_size *
 378                    (u_int64_t)runtime->period_size;
 379 #if BITS_PER_LONG < 64
 380         /* try to find lowest common multiple for buffer and period */
 381         if (boundary > LONG_MAX - runtime->buffer_size) {
 382                 u_int32_t remainder = -1;
 383                 u_int32_t divident = runtime->buffer_size;
 384                 u_int32_t divisor = runtime->period_size;
 385                 while (remainder) {
 386                         remainder = divident % divisor;
 387                         if (remainder) {
 388                                 divident = divisor;
 389                                 divisor = remainder;
 390                         }
 391                 }
 392                 boundary = div_u64(boundary, divisor);
 393                 if (boundary > LONG_MAX - runtime->buffer_size)
 394                         return -ERANGE;
 395         }
 396 #endif
 397         if (boundary == 0)
 398                 return -ERANGE;
 399         runtime->boundary = boundary;
 400         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 401                 runtime->boundary *= 2;
 402         return 0;
 403 }
 404
 405 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 406                              struct snd_pcm_hw_params *params)
 407 {
 408         struct snd_pcm_runtime *runtime;
 409         int err, usecs;
 410         unsigned int bits;
 411         snd_pcm_uframes_t frames;
 412
 413         if (PCM_RUNTIME_CHECK(substream))
 414                 return -ENXIO;
 415         runtime = substream->runtime;
 416         snd_pcm_stream_lock_irq(substream);
 417         switch (runtime->status->state) {
 418         case SNDRV_PCM_STATE_OPEN:
 419         case SNDRV_PCM_STATE_SETUP:
 420         case SNDRV_PCM_STATE_PREPARED:
 421                 break;
 422         default:
 423                 snd_pcm_stream_unlock_irq(substream);
 424                 return -EBADFD;
 425         }
 426         snd_pcm_stream_unlock_irq(substream);
 427 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 428         if (!substream->oss.oss)
 429 #endif
 430                 if (atomic_read(&substream->mmap_count))
 431                         return -EBADFD;
 432
 433         params->rmask = ~0U;
 434         err = snd_pcm_hw_refine(substream, params);
 435         if (err < 0)
 436                 goto _error;
 437
 438         err = snd_pcm_hw_params_choose(substream, params);
 439         if (err < 0)
 440                 goto _error;
 441
 442         if (substream->ops->hw_params != NULL) {
 443                 err = substream->ops->hw_params(substream, params);
 444                 if (err < 0)
 445                         goto _error;
 446         }
 447
 448         runtime->access = params_access(params);
 449         runtime->format = params_format(params);
 450         runtime->subformat = params_subformat(params);
 451         runtime->channels = params_channels(params);
 452         runtime->rate = params_rate(params);
 453         runtime->period_size = params_period_size(params);
 454         runtime->periods = params_periods(params);
 455         runtime->buffer_size = params_buffer_size(params);
 456         runtime->info = params->info;
 457         runtime->rate_num = params->rate_num;
 458         runtime->rate_den = params->rate_den;
 459
 460         bits = snd_pcm_format_physical_width(runtime->format);
 461         runtime->sample_bits = bits;
 462         bits *= runtime->channels;
 463         runtime->frame_bits = bits;
 464         frames = 1;
 465         while (bits % 8 != 0) {
 466                 bits *= 2;
 467                 frames *= 2;
 468         }
 469         runtime->byte_align = bits / 8;
 470         runtime->min_align = frames;
 471
 472         /* Default sw params */
 473         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 474         runtime->period_step = 1;
 475         runtime->control->avail_min = runtime->period_size;
 476         runtime->start_threshold = 1;
 477         runtime->stop_threshold = runtime->buffer_size;
 478         runtime->silence_threshold = 0;
 479         runtime->silence_size = 0;
 480         err = calc_boundary(runtime);
 481         if (err < 0)
 482                 goto _error;
 483
 484         snd_pcm_timer_resolution_change(substream);
 485         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 486
 487         if (substream->latency_pm_qos_req) {
 488                 pm_qos_remove_request(substream->latency_pm_qos_req);
 489                 substream->latency_pm_qos_req = NULL;
 490         }
 491         if ((usecs = period_to_usecs(runtime)) >= 0)
 492                 substream->latency_pm_qos_req = pm_qos_add_request(
 493                                         PM_QOS_CPU_DMA_LATENCY, usecs);
 494         return 0;
 495  _error:
 496         /* hardware might be unuseable from this time,
 497            so we force application to retry to set
 498            the correct hardware parameter settings */
 499         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 500         if (substream->ops->hw_free != NULL)
 501                 substream->ops->hw_free(substream);
 502         return err;
 503 }
 504
 505 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 506                                   struct snd_pcm_hw_params __user * _params)
 507 {
 508         struct snd_pcm_hw_params *params;
 509         int err;
 510
 511         params = memdup_user(_params, sizeof(*params));
 512         if (IS_ERR(params))
 513                 return PTR_ERR(params);
 514
 515         err = snd_pcm_hw_params(substream, params);
 516         if (copy_to_user(_params, params, sizeof(*params))) {
 517                 if (!err)
 518                         err = -EFAULT;
 519         }
 520
 521         kfree(params);
 522         return err;
 523 }
 524
 525 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 526 {
 527         struct snd_pcm_runtime *runtime;
 528         int result = 0;
 529
 530         if (PCM_RUNTIME_CHECK(substream))
 531                 return -ENXIO;
 532         runtime = substream->runtime;
 533         snd_pcm_stream_lock_irq(substream);
 534         switch (runtime->status->state) {
 535         case SNDRV_PCM_STATE_SETUP:
 536         case SNDRV_PCM_STATE_PREPARED:
 537                 break;
 538         default:
 539                 snd_pcm_stream_unlock_irq(substream);
 540                 return -EBADFD;
 541         }
 542         snd_pcm_stream_unlock_irq(substream);
 543         if (atomic_read(&substream->mmap_count))
 544                 return -EBADFD;
 545         if (substream->ops->hw_free)
 546                 result = substream->ops->hw_free(substream);
 547         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 548         pm_qos_remove_request(substream->latency_pm_qos_req);
 549         substream->latency_pm_qos_req = NULL;
 550         return result;
 551 }
 552
 553 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 554                              struct snd_pcm_sw_params *params)
 555 {
 556         struct snd_pcm_runtime *runtime;
 557         int err;
 558
 559         if (PCM_RUNTIME_CHECK(substream))
 560                 return -ENXIO;
 561         runtime = substream->runtime;
 562         snd_pcm_stream_lock_irq(substream);
 563         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 564                 snd_pcm_stream_unlock_irq(substream);
 565                 return -EBADFD;
 566         }
 567         snd_pcm_stream_unlock_irq(substream);
 568
 569         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 570                 return -EINVAL;
 571         if (params->avail_min == 0)
 572                 return -EINVAL;
 573         if (params->silence_size >= runtime->boundary) {
 574                 if (params->silence_threshold != 0)
 575                         return -EINVAL;
 576         } else {
 577                 if (params->silence_size > params->silence_threshold)
 578                         return -EINVAL;
 579                 if (params->silence_threshold > runtime->buffer_size)
 580                         return -EINVAL;
 581         }
 582         err = 0;
 583         snd_pcm_stream_lock_irq(substream);
 584         runtime->tstamp_mode = params->tstamp_mode;
 585         runtime->period_step = params->period_step;
 586         runtime->control->avail_min = params->avail_min;
 587         runtime->start_threshold = params->start_threshold;
 588         runtime->stop_threshold = params->stop_threshold;
 589         runtime->silence_threshold = params->silence_threshold;
 590         runtime->silence_size = params->silence_size;
 591         params->boundary = runtime->boundary;
 592         if (snd_pcm_running(substream)) {
 593                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 594                     runtime->silence_size > 0)
 595                         snd_pcm_playback_silence(substream, ULONG_MAX);
 596                 err = snd_pcm_update_state(substream, runtime);
 597         }
 598         snd_pcm_stream_unlock_irq(substream);
 599         return err;
 600 }
 601
 602 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 603                                   struct snd_pcm_sw_params __user * _params)
 604 {
 605         struct snd_pcm_sw_params params;
 606         int err;
 607         if (copy_from_user(&params, _params, sizeof(params)))
 608                 return -EFAULT;
 609         err = snd_pcm_sw_params(substream, &params);
 610         if (copy_to_user(_params, &params, sizeof(params)))
 611                 return -EFAULT;
 612         return err;
 613 }
 614
 615 int snd_pcm_status(struct snd_pcm_substream *substream,
 616                    struct snd_pcm_status *status)
 617 {
 618         struct snd_pcm_runtime *runtime = substream->runtime;
 619
 620         snd_pcm_stream_lock_irq(substream);
 621         status->state = runtime->status->state;
 622         status->suspended_state = runtime->status->suspended_state;
 623         if (status->state == SNDRV_PCM_STATE_OPEN)
 624                 goto _end;
 625         status->trigger_tstamp = runtime->trigger_tstamp;
 626         if (snd_pcm_running(substream)) {
 627                 snd_pcm_update_hw_ptr(substream);
 628                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 629                         status->tstamp = runtime->status->tstamp;
 630                         goto _tstamp_end;
 631                 }
 632         }
 633         snd_pcm_gettime(runtime, &status->tstamp);
 634  _tstamp_end:
 635         status->appl_ptr = runtime->control->appl_ptr;
 636         status->hw_ptr = runtime->status->hw_ptr;
 637         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 638                 status->avail = snd_pcm_playback_avail(runtime);
 639                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 640                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 641                         status->delay = runtime->buffer_size - status->avail;
 642                         status->delay += runtime->delay;
 643                 } else
 644                         status->delay = 0;
 645         } else {
 646                 status->avail = snd_pcm_capture_avail(runtime);
 647                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 648                         status->delay = status->avail + runtime->delay;
 649                 else
 650                         status->delay = 0;
 651         }
 652         status->avail_max = runtime->avail_max;
 653         status->overrange = runtime->overrange;
 654         runtime->avail_max = 0;
 655         runtime->overrange = 0;
 656  _end:
 657         snd_pcm_stream_unlock_irq(substream);
 658         return 0;
 659 }
 660
 661 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 662                                struct snd_pcm_status __user * _status)
 663 {
 664         struct snd_pcm_status status;
 665         int res;
 666
 667         memset(&status, 0, sizeof(status));
 668         res = snd_pcm_status(substream, &status);
 669         if (res < 0)
 670                 return res;
 671         if (copy_to_user(_status, &status, sizeof(status)))
 672                 return -EFAULT;
 673         return 0;
 674 }
 675
 676 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 677                                 struct snd_pcm_channel_info * info)
 678 {
 679         struct snd_pcm_runtime *runtime;
 680         unsigned int channel;
 681
 682         channel = info->channel;
 683         runtime = substream->runtime;
 684         snd_pcm_stream_lock_irq(substream);
 685         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 686                 snd_pcm_stream_unlock_irq(substream);
 687                 return -EBADFD;
 688         }
 689         snd_pcm_stream_unlock_irq(substream);
 690         if (channel >= runtime->channels)
 691                 return -EINVAL;
 692         memset(info, 0, sizeof(*info));
 693         info->channel = channel;
 694         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 695 }
 696
 697 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 698                                      struct snd_pcm_channel_info __user * _info)
 699 {
 700         struct snd_pcm_channel_info info;
 701         int res;
 702
 703         if (copy_from_user(&info, _info, sizeof(info)))
 704                 return -EFAULT;
 705         res = snd_pcm_channel_info(substream, &info);
 706         if (res < 0)
 707                 return res;
 708         if (copy_to_user(_info, &info, sizeof(info)))
 709                 return -EFAULT;
 710         return 0;
 711 }
 712
 713 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 714 {
 715         struct snd_pcm_runtime *runtime = substream->runtime;
 716         if (runtime->trigger_master == NULL)
 717                 return;
 718         if (runtime->trigger_master == substream) {
 719                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 720         } else {
 721                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 722                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 723         }
 724         runtime->trigger_master = NULL;
 725 }
 726
 727 struct action_ops {
 728         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 729         int (*do_action)(struct snd_pcm_substream *substream, int state);
 730         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 731         void (*post_action)(struct snd_pcm_substream *substream, int state);
 732 };
 733
 734 /*
 735  *  this functions is core for handling of linked stream
 736  *  Note: the stream state might be changed also on failure
 737  *  Note2: call with calling stream lock + link lock
 738  */
 739 static int snd_pcm_action_group(struct action_ops *ops,
 740                                 struct snd_pcm_substream *substream,
 741                                 int state, int do_lock)
 742 {
 743         struct snd_pcm_substream *s = NULL;
 744         struct snd_pcm_substream *s1;
 745         int res = 0;
 746
 747         snd_pcm_group_for_each_entry(s, substream) {
 748                 if (do_lock && s != substream)
 749                         spin_lock_nested(&s->self_group.lock,
 750                                          SINGLE_DEPTH_NESTING);
 751                 res = ops->pre_action(s, state);
 752                 if (res < 0)
 753                         goto _unlock;
 754         }
 755         snd_pcm_group_for_each_entry(s, substream) {
 756                 res = ops->do_action(s, state);
 757                 if (res < 0) {
 758                         if (ops->undo_action) {
 759                                 snd_pcm_group_for_each_entry(s1, substream) {
 760                                         if (s1 == s) /* failed stream */
 761                                                 break;
 762                                         ops->undo_action(s1, state);
 763                                 }
 764                         }
 765                         s = NULL; /* unlock all */
 766                         goto _unlock;
 767                 }
 768         }
 769         snd_pcm_group_for_each_entry(s, substream) {
 770                 ops->post_action(s, state);
 771         }
 772  _unlock:
 773         if (do_lock) {
 774                 /* unlock streams */
 775                 snd_pcm_group_for_each_entry(s1, substream) {
 776                         if (s1 != substream)
 777                                 spin_unlock(&s1->self_group.lock);
 778                         if (s1 == s)    /* end */
 779                                 break;
 780                 }
 781         }
 782         return res;
 783 }
 784
 785 /*
 786  *  Note: call with stream lock
 787  */
 788 static int snd_pcm_action_single(struct action_ops *ops,
 789                                  struct snd_pcm_substream *substream,
 790                                  int state)
 791 {
 792         int res;
 793
 794         res = ops->pre_action(substream, state);
 795         if (res < 0)
 796                 return res;
 797         res = ops->do_action(substream, state);
 798         if (res == 0)
 799                 ops->post_action(substream, state);
 800         else if (ops->undo_action)
 801                 ops->undo_action(substream, state);
 802         return res;
 803 }
 804
 805 /*
 806  *  Note: call with stream lock
 807  */
 808 static int snd_pcm_action(struct action_ops *ops,
 809                           struct snd_pcm_substream *substream,
 810                           int state)
 811 {
 812         int res;
 813
 814         if (snd_pcm_stream_linked(substream)) {
 815                 if (!spin_trylock(&substream->group->lock)) {
 816                         spin_unlock(&substream->self_group.lock);
 817                         spin_lock(&substream->group->lock);
 818                         spin_lock(&substream->self_group.lock);
 819                 }
 820                 res = snd_pcm_action_group(ops, substream, state, 1);
 821                 spin_unlock(&substream->group->lock);
 822         } else {
 823                 res = snd_pcm_action_single(ops, substream, state);
 824         }
 825         return res;
 826 }
 827
 828 /*
 829  *  Note: don't use any locks before
 830  */
 831 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 832                                    struct snd_pcm_substream *substream,
 833                                    int state)
 834 {
 835         int res;
 836
 837         read_lock_irq(&snd_pcm_link_rwlock);
 838         if (snd_pcm_stream_linked(substream)) {
 839                 spin_lock(&substream->group->lock);
 840                 spin_lock(&substream->self_group.lock);
 841                 res = snd_pcm_action_group(ops, substream, state, 1);
 842                 spin_unlock(&substream->self_group.lock);
 843                 spin_unlock(&substream->group->lock);
 844         } else {
 845                 spin_lock(&substream->self_group.lock);
 846                 res = snd_pcm_action_single(ops, substream, state);
 847                 spin_unlock(&substream->self_group.lock);
 848         }
 849         read_unlock_irq(&snd_pcm_link_rwlock);
 850         return res;
 851 }
 852
 853 /*
 854  */
 855 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 856                                     struct snd_pcm_substream *substream,
 857                                     int state)
 858 {
 859         int res;
 860
 861         down_read(&snd_pcm_link_rwsem);
 862         if (snd_pcm_stream_linked(substream))
 863                 res = snd_pcm_action_group(ops, substream, state, 0);
 864         else
 865                 res = snd_pcm_action_single(ops, substream, state);
 866         up_read(&snd_pcm_link_rwsem);
 867         return res;
 868 }
 869
 870 /*
 871  * start callbacks
 872  */
 873 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 874 {
 875         struct snd_pcm_runtime *runtime = substream->runtime;
 876         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 877                 return -EBADFD;
 878         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 879             !snd_pcm_playback_data(substream))
 880                 return -EPIPE;
 881         runtime->trigger_master = substream;
 882         return 0;
 883 }
 884
 885 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 886 {
 887         if (substream->runtime->trigger_master != substream)
 888                 return 0;
 889         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 890 }
 891
 892 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 893 {
 894         if (substream->runtime->trigger_master == substream)
 895                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 896 }
 897
 898 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 899 {
 900         struct snd_pcm_runtime *runtime = substream->runtime;
 901         snd_pcm_trigger_tstamp(substream);
 902         runtime->hw_ptr_jiffies = jiffies;
 903         runtime->status->state = state;
 904         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 905             runtime->silence_size > 0)
 906                 snd_pcm_playback_silence(substream, ULONG_MAX);
 907         if (substream->timer)
 908                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 909                                  &runtime->trigger_tstamp);
 910 }
 911
 912 static struct action_ops snd_pcm_action_start = {
 913         .pre_action = snd_pcm_pre_start,
 914         .do_action = snd_pcm_do_start,
 915         .undo_action = snd_pcm_undo_start,
 916         .post_action = snd_pcm_post_start
 917 };
 918
 919 /**
 920  * snd_pcm_start - start all linked streams
 921  * @substream: the PCM substream instance
 922  */
 923 int snd_pcm_start(struct snd_pcm_substream *substream)
 924 {
 925         return snd_pcm_action(&snd_pcm_action_start, substream,
 926                               SNDRV_PCM_STATE_RUNNING);
 927 }
 928
 929 /*
 930  * stop callbacks
 931  */
 932 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 933 {
 934         struct snd_pcm_runtime *runtime = substream->runtime;
 935         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 936                 return -EBADFD;
 937         runtime->trigger_master = substream;
 938         return 0;
 939 }
 940
 941 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 942 {
 943         if (substream->runtime->trigger_master == substream &&
 944             snd_pcm_running(substream))
 945                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 946         return 0; /* unconditonally stop all substreams */
 947 }
 948
 949 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 950 {
 951         struct snd_pcm_runtime *runtime = substream->runtime;
 952         if (runtime->status->state != state) {
 953                 snd_pcm_trigger_tstamp(substream);
 954                 if (substream->timer)
 955                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 956                                          &runtime->trigger_tstamp);
 957                 runtime->status->state = state;
 958         }
 959         wake_up(&runtime->sleep);
 960         wake_up(&runtime->tsleep);
 961 }
 962
 963 static struct action_ops snd_pcm_action_stop = {
 964         .pre_action = snd_pcm_pre_stop,
 965         .do_action = snd_pcm_do_stop,
 966         .post_action = snd_pcm_post_stop
 967 };
 968
 969 /**
 970  * snd_pcm_stop - try to stop all running streams in the substream group
 971  * @substream: the PCM substream instance
 972  * @state: PCM state after stopping the stream
 973  *
 974  * The state of each stream is then changed to the given state unconditionally.
 975  */
 976 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 977 {
 978         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 979 }
 980
 981 EXPORT_SYMBOL(snd_pcm_stop);
 982
 983 /**
 984  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 985  * @substream: the PCM substream
 986  *
 987  * After stopping, the state is changed to SETUP.
 988  * Unlike snd_pcm_stop(), this affects only the given stream.
 989  */
 990 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 991 {
 992         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 993                                      SNDRV_PCM_STATE_SETUP);
 994 }
 995
 996 /*
 997  * pause callbacks
 998  */
 999 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
1000 {
1001         struct snd_pcm_runtime *runtime = substream->runtime;
1002         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1003                 return -ENOSYS;
1004         if (push) {
1005                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1006                         return -EBADFD;
1007         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1008                 return -EBADFD;
1009         runtime->trigger_master = substream;
1010         return 0;
1011 }
1012
1013 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1014 {
1015         if (substream->runtime->trigger_master != substream)
1016                 return 0;
1017         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1018          * a delta betwen the current jiffies, this gives a large enough
1019          * delta, effectively to skip the check once.
1020          */
1021         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1022         return substream->ops->trigger(substream,
1023                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1024                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1025 }
1026
1027 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1028 {
1029         if (substream->runtime->trigger_master == substream)
1030                 substream->ops->trigger(substream,
1031                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1032                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1033 }
1034
1035 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1036 {
1037         struct snd_pcm_runtime *runtime = substream->runtime;
1038         snd_pcm_trigger_tstamp(substream);
1039         if (push) {
1040                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1041                 if (substream->timer)
1042                         snd_timer_notify(substream->timer,
1043                                          SNDRV_TIMER_EVENT_MPAUSE,
1044                                          &runtime->trigger_tstamp);
1045                 wake_up(&runtime->sleep);
1046                 wake_up(&runtime->tsleep);
1047         } else {
1048                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1049                 if (substream->timer)
1050                         snd_timer_notify(substream->timer,
1051                                          SNDRV_TIMER_EVENT_MCONTINUE,
1052                                          &runtime->trigger_tstamp);
1053         }
1054 }
1055
1056 static struct action_ops snd_pcm_action_pause = {
1057         .pre_action = snd_pcm_pre_pause,
1058         .do_action = snd_pcm_do_pause,
1059         .undo_action = snd_pcm_undo_pause,
1060         .post_action = snd_pcm_post_pause
1061 };
1062
1063 /*
1064  * Push/release the pause for all linked streams.
1065  */
1066 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1067 {
1068         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1069 }
1070
1071 #ifdef CONFIG_PM
1072 /* suspend */
1073
1074 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1075 {
1076         struct snd_pcm_runtime *runtime = substream->runtime;
1077         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1078                 return -EBUSY;
1079         runtime->trigger_master = substream;
1080         return 0;
1081 }
1082
1083 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1084 {
1085         struct snd_pcm_runtime *runtime = substream->runtime;
1086         if (runtime->trigger_master != substream)
1087                 return 0;
1088         if (! snd_pcm_running(substream))
1089                 return 0;
1090         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1091         return 0; /* suspend unconditionally */
1092 }
1093
1094 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1095 {
1096         struct snd_pcm_runtime *runtime = substream->runtime;
1097         snd_pcm_trigger_tstamp(substream);
1098         if (substream->timer)
1099                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1100                                  &runtime->trigger_tstamp);
1101         runtime->status->suspended_state = runtime->status->state;
1102         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1103         wake_up(&runtime->sleep);
1104         wake_up(&runtime->tsleep);
1105 }
1106
1107 static struct action_ops snd_pcm_action_suspend = {
1108         .pre_action = snd_pcm_pre_suspend,
1109         .do_action = snd_pcm_do_suspend,
1110         .post_action = snd_pcm_post_suspend
1111 };
1112
1113 /**
1114  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1115  * @substream: the PCM substream
1116  *
1117  * After this call, all streams are changed to SUSPENDED state.
1118  */
1119 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1120 {
1121         int err;
1122         unsigned long flags;
1123
1124         if (! substream)
1125                 return 0;
1126
1127         snd_pcm_stream_lock_irqsave(substream, flags);
1128         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1129         snd_pcm_stream_unlock_irqrestore(substream, flags);
1130         return err;
1131 }
1132
1133 EXPORT_SYMBOL(snd_pcm_suspend);
1134
1135 /**
1136  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1137  * @pcm: the PCM instance
1138  *
1139  * After this call, all streams are changed to SUSPENDED state.
1140  */
1141 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1142 {
1143         struct snd_pcm_substream *substream;
1144         int stream, err = 0;
1145
1146         if (! pcm)
1147                 return 0;
1148
1149         for (stream = 0; stream < 2; stream++) {
1150                 for (substream = pcm->streams[stream].substream;
1151                      substream; substream = substream->next) {
1152                         /* FIXME: the open/close code should lock this as well */
1153                         if (substream->runtime == NULL)
1154                                 continue;
1155                         err = snd_pcm_suspend(substream);
1156                         if (err < 0 && err != -EBUSY)
1157                                 return err;
1158                 }
1159         }
1160         return 0;
1161 }
1162
1163 EXPORT_SYMBOL(snd_pcm_suspend_all);
1164
1165 /* resume */
1166
1167 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1168 {
1169         struct snd_pcm_runtime *runtime = substream->runtime;
1170         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1171                 return -ENOSYS;
1172         runtime->trigger_master = substream;
1173         return 0;
1174 }
1175
1176 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1177 {
1178         struct snd_pcm_runtime *runtime = substream->runtime;
1179         if (runtime->trigger_master != substream)
1180                 return 0;
1181         /* DMA not running previously? */
1182         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1183             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1184              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1185                 return 0;
1186         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1187 }
1188
1189 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1190 {
1191         if (substream->runtime->trigger_master == substream &&
1192             snd_pcm_running(substream))
1193                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1194 }
1195
1196 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1197 {
1198         struct snd_pcm_runtime *runtime = substream->runtime;
1199         snd_pcm_trigger_tstamp(substream);
1200         if (substream->timer)
1201                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1202                                  &runtime->trigger_tstamp);
1203         runtime->status->state = runtime->status->suspended_state;
1204 }
1205
1206 static struct action_ops snd_pcm_action_resume = {
1207         .pre_action = snd_pcm_pre_resume,
1208         .do_action = snd_pcm_do_resume,
1209         .undo_action = snd_pcm_undo_resume,
1210         .post_action = snd_pcm_post_resume
1211 };
1212
1213 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1214 {
1215         struct snd_card *card = substream->pcm->card;
1216         int res;
1217
1218         snd_power_lock(card);
1219         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1220                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1221         snd_power_unlock(card);
1222         return res;
1223 }
1224
1225 #else
1226
1227 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1228 {
1229         return -ENOSYS;
1230 }
1231
1232 #endif /* CONFIG_PM */
1233
1234 /*
1235  * xrun ioctl
1236  *
1237  * Change the RUNNING stream(s) to XRUN state.
1238  */
1239 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1240 {
1241         struct snd_card *card = substream->pcm->card;
1242         struct snd_pcm_runtime *runtime = substream->runtime;
1243         int result;
1244
1245         snd_power_lock(card);
1246         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1247                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1248                 if (result < 0)
1249                         goto _unlock;
1250         }
1251
1252         snd_pcm_stream_lock_irq(substream);
1253         switch (runtime->status->state) {
1254         case SNDRV_PCM_STATE_XRUN:
1255                 result = 0;     /* already there */
1256                 break;
1257         case SNDRV_PCM_STATE_RUNNING:
1258                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1259                 break;
1260         default:
1261                 result = -EBADFD;
1262         }
1263         snd_pcm_stream_unlock_irq(substream);
1264  _unlock:
1265         snd_power_unlock(card);
1266         return result;
1267 }
1268
1269 /*
1270  * reset ioctl
1271  */
1272 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1273 {
1274         struct snd_pcm_runtime *runtime = substream->runtime;
1275         switch (runtime->status->state) {
1276         case SNDRV_PCM_STATE_RUNNING:
1277         case SNDRV_PCM_STATE_PREPARED:
1278         case SNDRV_PCM_STATE_PAUSED:
1279         case SNDRV_PCM_STATE_SUSPENDED:
1280                 return 0;
1281         default:
1282                 return -EBADFD;
1283         }
1284 }
1285
1286 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1287 {
1288         struct snd_pcm_runtime *runtime = substream->runtime;
1289         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1290         if (err < 0)
1291                 return err;
1292         runtime->hw_ptr_base = 0;
1293         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1294                 runtime->status->hw_ptr % runtime->period_size;
1295         runtime->silence_start = runtime->status->hw_ptr;
1296         runtime->silence_filled = 0;
1297         return 0;
1298 }
1299
1300 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1301 {
1302         struct snd_pcm_runtime *runtime = substream->runtime;
1303         runtime->control->appl_ptr = runtime->status->hw_ptr;
1304         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1305             runtime->silence_size > 0)
1306                 snd_pcm_playback_silence(substream, ULONG_MAX);
1307 }
1308
1309 static struct action_ops snd_pcm_action_reset = {
1310         .pre_action = snd_pcm_pre_reset,
1311         .do_action = snd_pcm_do_reset,
1312         .post_action = snd_pcm_post_reset
1313 };
1314
1315 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1316 {
1317         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1318 }
1319
1320 /*
1321  * prepare ioctl
1322  */
1323 /* we use the second argument for updating f_flags */
1324 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1325                                int f_flags)
1326 {
1327         struct snd_pcm_runtime *runtime = substream->runtime;
1328         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1329             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1330                 return -EBADFD;
1331         if (snd_pcm_running(substream))
1332                 return -EBUSY;
1333         substream->f_flags = f_flags;
1334         return 0;
1335 }
1336
1337 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1338 {
1339         int err;
1340         err = substream->ops->prepare(substream);
1341         if (err < 0)
1342                 return err;
1343         return snd_pcm_do_reset(substream, 0);
1344 }
1345
1346 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1347 {
1348         struct snd_pcm_runtime *runtime = substream->runtime;
1349         runtime->control->appl_ptr = runtime->status->hw_ptr;
1350         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1351 }
1352
1353 static struct action_ops snd_pcm_action_prepare = {
1354         .pre_action = snd_pcm_pre_prepare,
1355         .do_action = snd_pcm_do_prepare,
1356         .post_action = snd_pcm_post_prepare
1357 };
1358
1359 /**
1360  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1361  * @substream: the PCM substream instance
1362  * @file: file to refer f_flags
1363  */
1364 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1365                            struct file *file)
1366 {
1367         int res;
1368         struct snd_card *card = substream->pcm->card;
1369         int f_flags;
1370
1371         if (file)
1372                 f_flags = file->f_flags;
1373         else
1374                 f_flags = substream->f_flags;
1375
1376         snd_power_lock(card);
1377         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1378                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1379                                                substream, f_flags);
1380         snd_power_unlock(card);
1381         return res;
1382 }
1383
1384 /*
1385  * drain ioctl
1386  */
1387
1388 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1389 {
1390         substream->runtime->trigger_master = substream;
1391         return 0;
1392 }
1393
1394 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1395 {
1396         struct snd_pcm_runtime *runtime = substream->runtime;
1397         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1398                 switch (runtime->status->state) {
1399                 case SNDRV_PCM_STATE_PREPARED:
1400                         /* start playback stream if possible */
1401                         if (! snd_pcm_playback_empty(substream)) {
1402                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1403                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1404                         }
1405                         break;
1406                 case SNDRV_PCM_STATE_RUNNING:
1407                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1408                         break;
1409                 default:
1410                         break;
1411                 }
1412         } else {
1413                 /* stop running stream */
1414                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1415                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1416                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1417                         snd_pcm_do_stop(substream, new_state);
1418                         snd_pcm_post_stop(substream, new_state);
1419                 }
1420         }
1421         return 0;
1422 }
1423
1424 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1425 {
1426 }
1427
1428 static struct action_ops snd_pcm_action_drain_init = {
1429         .pre_action = snd_pcm_pre_drain_init,
1430         .do_action = snd_pcm_do_drain_init,
1431         .post_action = snd_pcm_post_drain_init
1432 };
1433
1434 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1435
1436 /*
1437  * Drain the stream(s).
1438  * When the substream is linked, sync until the draining of all playback streams
1439  * is finished.
1440  * After this call, all streams are supposed to be either SETUP or DRAINING
1441  * (capture only) state.
1442  */
1443 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1444                          struct file *file)
1445 {
1446         struct snd_card *card;
1447         struct snd_pcm_runtime *runtime;
1448         struct snd_pcm_substream *s;
1449         wait_queue_t wait;
1450         int result = 0;
1451         int nonblock = 0;
1452
1453         card = substream->pcm->card;
1454         runtime = substream->runtime;
1455
1456         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1457                 return -EBADFD;
1458
1459         snd_power_lock(card);
1460         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1461                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1462                 if (result < 0) {
1463                         snd_power_unlock(card);
1464                         return result;
1465                 }
1466         }
1467
1468         if (file) {
1469                 if (file->f_flags & O_NONBLOCK)
1470                         nonblock = 1;
1471         } else if (substream->f_flags & O_NONBLOCK)
1472                 nonblock = 1;
1473
1474         down_read(&snd_pcm_link_rwsem);
1475         snd_pcm_stream_lock_irq(substream);
1476         /* resume pause */
1477         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1478                 snd_pcm_pause(substream, 0);
1479
1480         /* pre-start/stop - all running streams are changed to DRAINING state */
1481         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1482         if (result < 0)
1483                 goto unlock;
1484         /* in non-blocking, we don't wait in ioctl but let caller poll */
1485         if (nonblock) {
1486                 result = -EAGAIN;
1487                 goto unlock;
1488         }
1489
1490         for (;;) {
1491                 long tout;
1492                 struct snd_pcm_runtime *to_check;
1493                 if (signal_pending(current)) {
1494                         result = -ERESTARTSYS;
1495                         break;
1496                 }
1497                 /* find a substream to drain */
1498                 to_check = NULL;
1499                 snd_pcm_group_for_each_entry(s, substream) {
1500                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1501                                 continue;
1502                         runtime = s->runtime;
1503                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1504                                 to_check = runtime;
1505                                 break;
1506                         }
1507                 }
1508                 if (!to_check)
1509                         break; /* all drained */
1510                 init_waitqueue_entry(&wait, current);
1511                 add_wait_queue(&to_check->sleep, &wait);
1512                 set_current_state(TASK_INTERRUPTIBLE);
1513                 snd_pcm_stream_unlock_irq(substream);
1514                 up_read(&snd_pcm_link_rwsem);
1515                 snd_power_unlock(card);
1516                 tout = schedule_timeout(10 * HZ);
1517                 snd_power_lock(card);
1518                 down_read(&snd_pcm_link_rwsem);
1519                 snd_pcm_stream_lock_irq(substream);
1520                 remove_wait_queue(&to_check->sleep, &wait);
1521                 if (tout == 0) {
1522                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1523                                 result = -ESTRPIPE;
1524                         else {
1525                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1526                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1527                                 result = -EIO;
1528                         }
1529                         break;
1530                 }
1531         }
1532
1533  unlock:
1534         snd_pcm_stream_unlock_irq(substream);
1535         up_read(&snd_pcm_link_rwsem);
1536         snd_power_unlock(card);
1537
1538         return result;
1539 }
1540
1541 /*
1542  * drop ioctl
1543  *
1544  * Immediately put all linked substreams into SETUP state.
1545  */
1546 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1547 {
1548         struct snd_pcm_runtime *runtime;
1549         struct snd_card *card;
1550         int result = 0;
1551
1552         if (PCM_RUNTIME_CHECK(substream))
1553                 return -ENXIO;
1554         runtime = substream->runtime;
1555         card = substream->pcm->card;
1556
1557         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1558             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1559             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1560                 return -EBADFD;
1561
1562         snd_pcm_stream_lock_irq(substream);
1563         /* resume pause */
1564         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1565                 snd_pcm_pause(substream, 0);
1566
1567         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1568         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1569         snd_pcm_stream_unlock_irq(substream);
1570
1571         return result;
1572 }
1573
1574
1575 /* WARNING: Don't forget to fput back the file */
1576 static struct file *snd_pcm_file_fd(int fd)
1577 {
1578         struct file *file;
1579         struct inode *inode;
1580         unsigned int minor;
1581
1582         file = fget(fd);
1583         if (!file)
1584                 return NULL;
1585         inode = file->f_path.dentry->d_inode;
1586         if (!S_ISCHR(inode->i_mode) ||
1587             imajor(inode) != snd_major) {
1588                 fput(file);
1589                 return NULL;
1590         }
1591         minor = iminor(inode);
1592         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1593             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1594                 fput(file);
1595                 return NULL;
1596         }
1597         return file;
1598 }
1599
1600 /*
1601  * PCM link handling
1602  */
1603 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1604 {
1605         int res = 0;
1606         struct file *file;
1607         struct snd_pcm_file *pcm_file;
1608         struct snd_pcm_substream *substream1;
1609
1610         file = snd_pcm_file_fd(fd);
1611         if (!file)
1612                 return -EBADFD;
1613         pcm_file = file->private_data;
1614         substream1 = pcm_file->substream;
1615         down_write(&snd_pcm_link_rwsem);
1616         write_lock_irq(&snd_pcm_link_rwlock);
1617         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1618             substream->runtime->status->state != substream1->runtime->status->state) {
1619                 res = -EBADFD;
1620                 goto _end;
1621         }
1622         if (snd_pcm_stream_linked(substream1)) {
1623                 res = -EALREADY;
1624                 goto _end;
1625         }
1626         if (!snd_pcm_stream_linked(substream)) {
1627                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1628                 if (substream->group == NULL) {
1629                         res = -ENOMEM;
1630                         goto _end;
1631                 }
1632                 spin_lock_init(&substream->group->lock);
1633                 INIT_LIST_HEAD(&substream->group->substreams);
1634                 list_add_tail(&substream->link_list, &substream->group->substreams);
1635                 substream->group->count = 1;
1636         }
1637         list_add_tail(&substream1->link_list, &substream->group->substreams);
1638         substream->group->count++;
1639         substream1->group = substream->group;
1640  _end:
1641         write_unlock_irq(&snd_pcm_link_rwlock);
1642         up_write(&snd_pcm_link_rwsem);
1643         fput(file);
1644         return res;
1645 }
1646
1647 static void relink_to_local(struct snd_pcm_substream *substream)
1648 {
1649         substream->group = &substream->self_group;
1650         INIT_LIST_HEAD(&substream->self_group.substreams);
1651         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1652 }
1653
1654 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1655 {
1656         struct snd_pcm_substream *s;
1657         int res = 0;
1658
1659         down_write(&snd_pcm_link_rwsem);
1660         write_lock_irq(&snd_pcm_link_rwlock);
1661         if (!snd_pcm_stream_linked(substream)) {
1662                 res = -EALREADY;
1663                 goto _end;
1664         }
1665         list_del(&substream->link_list);
1666         substream->group->count--;
1667         if (substream->group->count == 1) {     /* detach the last stream, too */
1668                 snd_pcm_group_for_each_entry(s, substream) {
1669                         relink_to_local(s);
1670                         break;
1671                 }
1672                 kfree(substream->group);
1673         }
1674         relink_to_local(substream);
1675        _end:
1676         write_unlock_irq(&snd_pcm_link_rwlock);
1677         up_write(&snd_pcm_link_rwsem);
1678         return res;
1679 }
1680
1681 /*
1682  * hw configurator
1683  */
1684 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1685                                struct snd_pcm_hw_rule *rule)
1686 {
1687         struct snd_interval t;
1688         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1689                      hw_param_interval_c(params, rule->deps[1]), &t);
1690         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1691 }
1692
1693 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1694                                struct snd_pcm_hw_rule *rule)
1695 {
1696         struct snd_interval t;
1697         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1698                      hw_param_interval_c(params, rule->deps[1]), &t);
1699         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1700 }
1701
1702 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1703                                    struct snd_pcm_hw_rule *rule)
1704 {
1705         struct snd_interval t;
1706         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1707                          hw_param_interval_c(params, rule->deps[1]),
1708                          (unsigned long) rule->private, &t);
1709         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1710 }
1711
1712 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1713                                    struct snd_pcm_hw_rule *rule)
1714 {
1715         struct snd_interval t;
1716         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1717                          (unsigned long) rule->private,
1718                          hw_param_interval_c(params, rule->deps[1]), &t);
1719         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1720 }
1721
1722 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1723                                   struct snd_pcm_hw_rule *rule)
1724 {
1725         unsigned int k;
1726         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1727         struct snd_mask m;
1728         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1729         snd_mask_any(&m);
1730         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1731                 int bits;
1732                 if (! snd_mask_test(mask, k))
1733                         continue;
1734                 bits = snd_pcm_format_physical_width(k);
1735                 if (bits <= 0)
1736                         continue; /* ignore invalid formats */
1737                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1738                         snd_mask_reset(&m, k);
1739         }
1740         return snd_mask_refine(mask, &m);
1741 }
1742
1743 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1744                                        struct snd_pcm_hw_rule *rule)
1745 {
1746         struct snd_interval t;
1747         unsigned int k;
1748         t.min = UINT_MAX;
1749         t.max = 0;
1750         t.openmin = 0;
1751         t.openmax = 0;
1752         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1753                 int bits;
1754                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1755                         continue;
1756                 bits = snd_pcm_format_physical_width(k);
1757                 if (bits <= 0)
1758                         continue; /* ignore invalid formats */
1759                 if (t.min > (unsigned)bits)
1760                         t.min = bits;
1761                 if (t.max < (unsigned)bits)
1762                         t.max = bits;
1763         }
1764         t.integer = 1;
1765         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1766 }
1767
1768 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1769 #error "Change this table"
1770 #endif
1771
1772 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1773                                  48000, 64000, 88200, 96000, 176400, 192000 };
1774
1775 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1776         .count = ARRAY_SIZE(rates),
1777         .list = rates,
1778 };
1779
1780 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1781                                 struct snd_pcm_hw_rule *rule)
1782 {
1783         struct snd_pcm_hardware *hw = rule->private;
1784         return snd_interval_list(hw_param_interval(params, rule->var),
1785                                  snd_pcm_known_rates.count,
1786                                  snd_pcm_known_rates.list, hw->rates);
1787 }
1788
1789 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1790                                             struct snd_pcm_hw_rule *rule)
1791 {
1792         struct snd_interval t;
1793         struct snd_pcm_substream *substream = rule->private;
1794         t.min = 0;
1795         t.max = substream->buffer_bytes_max;
1796         t.openmin = 0;
1797         t.openmax = 0;
1798         t.integer = 1;
1799         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1800 }
1801
1802 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1803 {
1804         struct snd_pcm_runtime *runtime = substream->runtime;
1805         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1806         int k, err;
1807
1808         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1809                 snd_mask_any(constrs_mask(constrs, k));
1810         }
1811
1812         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1813                 snd_interval_any(constrs_interval(constrs, k));
1814         }
1815
1816         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1817         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1818         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1819         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1820         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1821
1822         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1823                                    snd_pcm_hw_rule_format, NULL,
1824                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1825         if (err < 0)
1826                 return err;
1827         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1828                                   snd_pcm_hw_rule_sample_bits, NULL,
1829                                   SNDRV_PCM_HW_PARAM_FORMAT,
1830                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1831         if (err < 0)
1832                 return err;
1833         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1834                                   snd_pcm_hw_rule_div, NULL,
1835                                   SNDRV_PCM_HW_PARAM_FRAME_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_mul, NULL,
1840                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -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_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1846         if (err < 0)
1847                 return err;
1848         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1849                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1850                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1851         if (err < 0)
1852                 return err;
1853         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1854                                   snd_pcm_hw_rule_div, NULL,
1855                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -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_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1861         if (err < 0)
1862                 return err;
1863         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1864                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1865                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1866         if (err < 0)
1867                 return err;
1868         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1869                                   snd_pcm_hw_rule_div, NULL,
1870                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -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_div, NULL,
1875                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -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_mulkdiv, (void*) 8,
1880                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1881         if (err < 0)
1882                 return err;
1883         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1884                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1885                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -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_mul, NULL,
1890                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -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_mulkdiv, (void*) 8,
1895                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1896         if (err < 0)
1897                 return err;
1898         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1899                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1900                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1901         if (err < 0)
1902                 return err;
1903         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1904                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1905                                   SNDRV_PCM_HW_PARAM_PERIOD_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_BUFFER_BYTES,
1909                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1910                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1911         if (err < 0)
1912                 return err;
1913         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1914                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1915                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1916         if (err < 0)
1917                 return err;
1918         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1919                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1920                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1921         if (err < 0)
1922                 return err;
1923         return 0;
1924 }
1925
1926 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1927 {
1928         struct snd_pcm_runtime *runtime = substream->runtime;
1929         struct snd_pcm_hardware *hw = &runtime->hw;
1930         int err;
1931         unsigned int mask = 0;
1932
1933         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1934                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1935         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1936                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1937         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1938                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1939                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1940                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1941                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1942                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1943                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1944         }
1945         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1946         if (err < 0)
1947                 return err;
1948
1949         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1950         if (err < 0)
1951                 return err;
1952
1953         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1954         if (err < 0)
1955                 return err;
1956
1957         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1958                                            hw->channels_min, hw->channels_max);
1959         if (err < 0)
1960                 return err;
1961
1962         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1963                                            hw->rate_min, hw->rate_max);
1964         if (err < 0)
1965                 return err;
1966
1967         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1968                                            hw->period_bytes_min, hw->period_bytes_max);
1969         if (err < 0)
1970                 return err;
1971
1972         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1973                                            hw->periods_min, hw->periods_max);
1974         if (err < 0)
1975                 return err;
1976
1977         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1978                                            hw->period_bytes_min, hw->buffer_bytes_max);
1979         if (err < 0)
1980                 return err;
1981
1982         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1983                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1984                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1985         if (err < 0)
1986                 return err;
1987
1988         /* FIXME: remove */
1989         if (runtime->dma_bytes) {
1990                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1991                 if (err < 0)
1992                         return -EINVAL;
1993         }
1994
1995         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1996                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1997                                           snd_pcm_hw_rule_rate, hw,
1998                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1999                 if (err < 0)
2000                         return err;
2001         }
2002
2003         /* FIXME: this belong to lowlevel */
2004         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2005
2006         return 0;
2007 }
2008
2009 static void pcm_release_private(struct snd_pcm_substream *substream)
2010 {
2011         snd_pcm_unlink(substream);
2012 }
2013
2014 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2015 {
2016         substream->ref_count--;
2017         if (substream->ref_count > 0)
2018                 return;
2019
2020         snd_pcm_drop(substream);
2021         if (substream->hw_opened) {
2022                 if (substream->ops->hw_free != NULL)
2023                         substream->ops->hw_free(substream);
2024                 substream->ops->close(substream);
2025                 substream->hw_opened = 0;
2026         }
2027         if (substream->pcm_release) {
2028                 substream->pcm_release(substream);
2029                 substream->pcm_release = NULL;
2030         }
2031         snd_pcm_detach_substream(substream);
2032 }
2033
2034 EXPORT_SYMBOL(snd_pcm_release_substream);
2035
2036 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2037                            struct file *file,
2038                            struct snd_pcm_substream **rsubstream)
2039 {
2040         struct snd_pcm_substream *substream;
2041         int err;
2042
2043         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2044         if (err < 0)
2045                 return err;
2046         if (substream->ref_count > 1) {
2047                 *rsubstream = substream;
2048                 return 0;
2049         }
2050
2051         err = snd_pcm_hw_constraints_init(substream);
2052         if (err < 0) {
2053                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2054                 goto error;
2055         }
2056
2057         if ((err = substream->ops->open(substream)) < 0)
2058                 goto error;
2059
2060         substream->hw_opened = 1;
2061
2062         err = snd_pcm_hw_constraints_complete(substream);
2063         if (err < 0) {
2064                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2065                 goto error;
2066         }
2067
2068         *rsubstream = substream;
2069         return 0;
2070
2071  error:
2072         snd_pcm_release_substream(substream);
2073         return err;
2074 }
2075
2076 EXPORT_SYMBOL(snd_pcm_open_substream);
2077
2078 static int snd_pcm_open_file(struct file *file,
2079                              struct snd_pcm *pcm,
2080                              int stream,
2081                              struct snd_pcm_file **rpcm_file)
2082 {
2083         struct snd_pcm_file *pcm_file;
2084         struct snd_pcm_substream *substream;
2085         struct snd_pcm_str *str;
2086         int err;
2087
2088         if (rpcm_file)
2089                 *rpcm_file = NULL;
2090
2091         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2092         if (err < 0)
2093                 return err;
2094
2095         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2096         if (pcm_file == NULL) {
2097                 snd_pcm_release_substream(substream);
2098                 return -ENOMEM;
2099         }
2100         pcm_file->substream = substream;
2101         if (substream->ref_count == 1) {
2102                 str = substream->pstr;
2103                 substream->file = pcm_file;
2104                 substream->pcm_release = pcm_release_private;
2105         }
2106         file->private_data = pcm_file;
2107         if (rpcm_file)
2108                 *rpcm_file = pcm_file;
2109         return 0;
2110 }
2111
2112 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2113 {
2114         struct snd_pcm *pcm;
2115         int err = nonseekable_open(inode, file);
2116         if (err < 0)
2117                 return err;
2118         pcm = snd_lookup_minor_data(iminor(inode),
2119                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2120         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2121 }
2122
2123 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2124 {
2125         struct snd_pcm *pcm;
2126         int err = nonseekable_open(inode, file);
2127         if (err < 0)
2128                 return err;
2129         pcm = snd_lookup_minor_data(iminor(inode),
2130                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2131         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2132 }
2133
2134 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2135 {
2136         int err;
2137         struct snd_pcm_file *pcm_file;
2138         wait_queue_t wait;
2139
2140         if (pcm == NULL) {
2141                 err = -ENODEV;
2142                 goto __error1;
2143         }
2144         err = snd_card_file_add(pcm->card, file);
2145         if (err < 0)
2146                 goto __error1;
2147         if (!try_module_get(pcm->card->module)) {
2148                 err = -EFAULT;
2149                 goto __error2;
2150         }
2151         init_waitqueue_entry(&wait, current);
2152         add_wait_queue(&pcm->open_wait, &wait);
2153         mutex_lock(&pcm->open_mutex);
2154         while (1) {
2155                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2156                 if (err >= 0)
2157                         break;
2158                 if (err == -EAGAIN) {
2159                         if (file->f_flags & O_NONBLOCK) {
2160                                 err = -EBUSY;
2161                                 break;
2162                         }
2163                 } else
2164                         break;
2165                 set_current_state(TASK_INTERRUPTIBLE);
2166                 mutex_unlock(&pcm->open_mutex);
2167                 schedule();
2168                 mutex_lock(&pcm->open_mutex);
2169                 if (signal_pending(current)) {
2170                         err = -ERESTARTSYS;
2171                         break;
2172                 }
2173         }
2174         remove_wait_queue(&pcm->open_wait, &wait);
2175         mutex_unlock(&pcm->open_mutex);
2176         if (err < 0)
2177                 goto __error;
2178         return err;
2179
2180       __error:
2181         module_put(pcm->card->module);
2182       __error2:
2183         snd_card_file_remove(pcm->card, file);
2184       __error1:
2185         return err;
2186 }
2187
2188 static int snd_pcm_release(struct inode *inode, struct file *file)
2189 {
2190         struct snd_pcm *pcm;
2191         struct snd_pcm_substream *substream;
2192         struct snd_pcm_file *pcm_file;
2193
2194         pcm_file = file->private_data;
2195         substream = pcm_file->substream;
2196         if (snd_BUG_ON(!substream))
2197                 return -ENXIO;
2198         pcm = substream->pcm;
2199         mutex_lock(&pcm->open_mutex);
2200         snd_pcm_release_substream(substream);
2201         kfree(pcm_file);
2202         mutex_unlock(&pcm->open_mutex);
2203         wake_up(&pcm->open_wait);
2204         module_put(pcm->card->module);
2205         snd_card_file_remove(pcm->card, file);
2206         return 0;
2207 }
2208
2209 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2210                                                  snd_pcm_uframes_t frames)
2211 {
2212         struct snd_pcm_runtime *runtime = substream->runtime;
2213         snd_pcm_sframes_t appl_ptr;
2214         snd_pcm_sframes_t ret;
2215         snd_pcm_sframes_t hw_avail;
2216
2217         if (frames == 0)
2218                 return 0;
2219
2220         snd_pcm_stream_lock_irq(substream);
2221         switch (runtime->status->state) {
2222         case SNDRV_PCM_STATE_PREPARED:
2223                 break;
2224         case SNDRV_PCM_STATE_DRAINING:
2225         case SNDRV_PCM_STATE_RUNNING:
2226                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2227                         break;
2228                 /* Fall through */
2229         case SNDRV_PCM_STATE_XRUN:
2230                 ret = -EPIPE;
2231                 goto __end;
2232         case SNDRV_PCM_STATE_SUSPENDED:
2233                 ret = -ESTRPIPE;
2234                 goto __end;
2235         default:
2236                 ret = -EBADFD;
2237                 goto __end;
2238         }
2239
2240         hw_avail = snd_pcm_playback_hw_avail(runtime);
2241         if (hw_avail <= 0) {
2242                 ret = 0;
2243                 goto __end;
2244         }
2245         if (frames > (snd_pcm_uframes_t)hw_avail)
2246                 frames = hw_avail;
2247         appl_ptr = runtime->control->appl_ptr - frames;
2248         if (appl_ptr < 0)
2249                 appl_ptr += runtime->boundary;
2250         runtime->control->appl_ptr = appl_ptr;
2251         ret = frames;
2252  __end:
2253         snd_pcm_stream_unlock_irq(substream);
2254         return ret;
2255 }
2256
2257 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2258                                                 snd_pcm_uframes_t frames)
2259 {
2260         struct snd_pcm_runtime *runtime = substream->runtime;
2261         snd_pcm_sframes_t appl_ptr;
2262         snd_pcm_sframes_t ret;
2263         snd_pcm_sframes_t hw_avail;
2264
2265         if (frames == 0)
2266                 return 0;
2267
2268         snd_pcm_stream_lock_irq(substream);
2269         switch (runtime->status->state) {
2270         case SNDRV_PCM_STATE_PREPARED:
2271         case SNDRV_PCM_STATE_DRAINING:
2272                 break;
2273         case SNDRV_PCM_STATE_RUNNING:
2274                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2275                         break;
2276                 /* Fall through */
2277         case SNDRV_PCM_STATE_XRUN:
2278                 ret = -EPIPE;
2279                 goto __end;
2280         case SNDRV_PCM_STATE_SUSPENDED:
2281                 ret = -ESTRPIPE;
2282                 goto __end;
2283         default:
2284                 ret = -EBADFD;
2285                 goto __end;
2286         }
2287
2288         hw_avail = snd_pcm_capture_hw_avail(runtime);
2289         if (hw_avail <= 0) {
2290                 ret = 0;
2291                 goto __end;
2292         }
2293         if (frames > (snd_pcm_uframes_t)hw_avail)
2294                 frames = hw_avail;
2295         appl_ptr = runtime->control->appl_ptr - frames;
2296         if (appl_ptr < 0)
2297                 appl_ptr += runtime->boundary;
2298         runtime->control->appl_ptr = appl_ptr;
2299         ret = frames;
2300  __end:
2301         snd_pcm_stream_unlock_irq(substream);
2302         return ret;
2303 }
2304
2305 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2306                                                   snd_pcm_uframes_t frames)
2307 {
2308         struct snd_pcm_runtime *runtime = substream->runtime;
2309         snd_pcm_sframes_t appl_ptr;
2310         snd_pcm_sframes_t ret;
2311         snd_pcm_sframes_t avail;
2312
2313         if (frames == 0)
2314                 return 0;
2315
2316         snd_pcm_stream_lock_irq(substream);
2317         switch (runtime->status->state) {
2318         case SNDRV_PCM_STATE_PREPARED:
2319         case SNDRV_PCM_STATE_PAUSED:
2320                 break;
2321         case SNDRV_PCM_STATE_DRAINING:
2322         case SNDRV_PCM_STATE_RUNNING:
2323                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2324                         break;
2325                 /* Fall through */
2326         case SNDRV_PCM_STATE_XRUN:
2327                 ret = -EPIPE;
2328                 goto __end;
2329         case SNDRV_PCM_STATE_SUSPENDED:
2330                 ret = -ESTRPIPE;
2331                 goto __end;
2332         default:
2333                 ret = -EBADFD;
2334                 goto __end;
2335         }
2336
2337         avail = snd_pcm_playback_avail(runtime);
2338         if (avail <= 0) {
2339                 ret = 0;
2340                 goto __end;
2341         }
2342         if (frames > (snd_pcm_uframes_t)avail)
2343                 frames = avail;
2344         appl_ptr = runtime->control->appl_ptr + frames;
2345         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2346                 appl_ptr -= runtime->boundary;
2347         runtime->control->appl_ptr = appl_ptr;
2348         ret = frames;
2349  __end:
2350         snd_pcm_stream_unlock_irq(substream);
2351         return ret;
2352 }
2353
2354 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2355                                                  snd_pcm_uframes_t frames)
2356 {
2357         struct snd_pcm_runtime *runtime = substream->runtime;
2358         snd_pcm_sframes_t appl_ptr;
2359         snd_pcm_sframes_t ret;
2360         snd_pcm_sframes_t avail;
2361
2362         if (frames == 0)
2363                 return 0;
2364
2365         snd_pcm_stream_lock_irq(substream);
2366         switch (runtime->status->state) {
2367         case SNDRV_PCM_STATE_PREPARED:
2368         case SNDRV_PCM_STATE_DRAINING:
2369         case SNDRV_PCM_STATE_PAUSED:
2370                 break;
2371         case SNDRV_PCM_STATE_RUNNING:
2372                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2373                         break;
2374                 /* Fall through */
2375         case SNDRV_PCM_STATE_XRUN:
2376                 ret = -EPIPE;
2377                 goto __end;
2378         case SNDRV_PCM_STATE_SUSPENDED:
2379                 ret = -ESTRPIPE;
2380                 goto __end;
2381         default:
2382                 ret = -EBADFD;
2383                 goto __end;
2384         }
2385
2386         avail = snd_pcm_capture_avail(runtime);
2387         if (avail <= 0) {
2388                 ret = 0;
2389                 goto __end;
2390         }
2391         if (frames > (snd_pcm_uframes_t)avail)
2392                 frames = avail;
2393         appl_ptr = runtime->control->appl_ptr + frames;
2394         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2395                 appl_ptr -= runtime->boundary;
2396         runtime->control->appl_ptr = appl_ptr;
2397         ret = frames;
2398  __end:
2399         snd_pcm_stream_unlock_irq(substream);
2400         return ret;
2401 }
2402
2403 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2404 {
2405         struct snd_pcm_runtime *runtime = substream->runtime;
2406         int err;
2407
2408         snd_pcm_stream_lock_irq(substream);
2409         switch (runtime->status->state) {
2410         case SNDRV_PCM_STATE_DRAINING:
2411                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2412                         goto __badfd;
2413         case SNDRV_PCM_STATE_RUNNING:
2414                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2415                         break;
2416                 /* Fall through */
2417         case SNDRV_PCM_STATE_PREPARED:
2418         case SNDRV_PCM_STATE_SUSPENDED:
2419                 err = 0;
2420                 break;
2421         case SNDRV_PCM_STATE_XRUN:
2422                 err = -EPIPE;
2423                 break;
2424         default:
2425               __badfd:
2426                 err = -EBADFD;
2427                 break;
2428         }
2429         snd_pcm_stream_unlock_irq(substream);
2430         return err;
2431 }
2432
2433 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2434                          snd_pcm_sframes_t __user *res)
2435 {
2436         struct snd_pcm_runtime *runtime = substream->runtime;
2437         int err;
2438         snd_pcm_sframes_t n = 0;
2439
2440         snd_pcm_stream_lock_irq(substream);
2441         switch (runtime->status->state) {
2442         case SNDRV_PCM_STATE_DRAINING:
2443                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2444                         goto __badfd;
2445         case SNDRV_PCM_STATE_RUNNING:
2446                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2447                         break;
2448                 /* Fall through */
2449         case SNDRV_PCM_STATE_PREPARED:
2450         case SNDRV_PCM_STATE_SUSPENDED:
2451                 err = 0;
2452                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2453                         n = snd_pcm_playback_hw_avail(runtime);
2454                 else
2455                         n = snd_pcm_capture_avail(runtime);
2456                 n += runtime->delay;
2457                 break;
2458         case SNDRV_PCM_STATE_XRUN:
2459                 err = -EPIPE;
2460                 break;
2461         default:
2462               __badfd:
2463                 err = -EBADFD;
2464                 break;
2465         }
2466         snd_pcm_stream_unlock_irq(substream);
2467         if (!err)
2468                 if (put_user(n, res))
2469                         err = -EFAULT;
2470         return err;
2471 }
2472
2473 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2474                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2475 {
2476         struct snd_pcm_runtime *runtime = substream->runtime;
2477         struct snd_pcm_sync_ptr sync_ptr;
2478         volatile struct snd_pcm_mmap_status *status;
2479         volatile struct snd_pcm_mmap_control *control;
2480         int err;
2481
2482         memset(&sync_ptr, 0, sizeof(sync_ptr));
2483         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2484                 return -EFAULT;
2485         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2486                 return -EFAULT;
2487         status = runtime->status;
2488         control = runtime->control;
2489         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2490                 err = snd_pcm_hwsync(substream);
2491                 if (err < 0)
2492                         return err;
2493         }
2494         snd_pcm_stream_lock_irq(substream);
2495         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2496                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2497         else
2498                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2499         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2500                 control->avail_min = sync_ptr.c.control.avail_min;
2501         else
2502                 sync_ptr.c.control.avail_min = control->avail_min;
2503         sync_ptr.s.status.state = status->state;
2504         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2505         sync_ptr.s.status.tstamp = status->tstamp;
2506         sync_ptr.s.status.suspended_state = status->suspended_state;
2507         snd_pcm_stream_unlock_irq(substream);
2508         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2509                 return -EFAULT;
2510         return 0;
2511 }
2512
2513 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2514 {
2515         struct snd_pcm_runtime *runtime = substream->runtime;
2516         int arg;
2517
2518         if (get_user(arg, _arg))
2519                 return -EFAULT;
2520         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2521                 return -EINVAL;
2522         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2523         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2524                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2525         return 0;
2526 }
2527
2528 static int snd_pcm_common_ioctl1(struct file *file,
2529                                  struct snd_pcm_substream *substream,
2530                                  unsigned int cmd, void __user *arg)
2531 {
2532         switch (cmd) {
2533         case SNDRV_PCM_IOCTL_PVERSION:
2534                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2535         case SNDRV_PCM_IOCTL_INFO:
2536                 return snd_pcm_info_user(substream, arg);
2537         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2538                 return 0;
2539         case SNDRV_PCM_IOCTL_TTSTAMP:
2540                 return snd_pcm_tstamp(substream, arg);
2541         case SNDRV_PCM_IOCTL_HW_REFINE:
2542                 return snd_pcm_hw_refine_user(substream, arg);
2543         case SNDRV_PCM_IOCTL_HW_PARAMS:
2544                 return snd_pcm_hw_params_user(substream, arg);
2545         case SNDRV_PCM_IOCTL_HW_FREE:
2546                 return snd_pcm_hw_free(substream);
2547         case SNDRV_PCM_IOCTL_SW_PARAMS:
2548                 return snd_pcm_sw_params_user(substream, arg);
2549         case SNDRV_PCM_IOCTL_STATUS:
2550                 return snd_pcm_status_user(substream, arg);
2551         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2552                 return snd_pcm_channel_info_user(substream, arg);
2553         case SNDRV_PCM_IOCTL_PREPARE:
2554                 return snd_pcm_prepare(substream, file);
2555         case SNDRV_PCM_IOCTL_RESET:
2556                 return snd_pcm_reset(substream);
2557         case SNDRV_PCM_IOCTL_START:
2558                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2559         case SNDRV_PCM_IOCTL_LINK:
2560                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2561         case SNDRV_PCM_IOCTL_UNLINK:
2562                 return snd_pcm_unlink(substream);
2563         case SNDRV_PCM_IOCTL_RESUME:
2564                 return snd_pcm_resume(substream);
2565         case SNDRV_PCM_IOCTL_XRUN:
2566                 return snd_pcm_xrun(substream);
2567         case SNDRV_PCM_IOCTL_HWSYNC:
2568                 return snd_pcm_hwsync(substream);
2569         case SNDRV_PCM_IOCTL_DELAY:
2570                 return snd_pcm_delay(substream, arg);
2571         case SNDRV_PCM_IOCTL_SYNC_PTR:
2572                 return snd_pcm_sync_ptr(substream, arg);
2573 #ifdef CONFIG_SND_SUPPORT_OLD_API
2574         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2575                 return snd_pcm_hw_refine_old_user(substream, arg);
2576         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2577                 return snd_pcm_hw_params_old_user(substream, arg);
2578 #endif
2579         case SNDRV_PCM_IOCTL_DRAIN:
2580                 return snd_pcm_drain(substream, file);
2581         case SNDRV_PCM_IOCTL_DROP:
2582                 return snd_pcm_drop(substream);
2583         case SNDRV_PCM_IOCTL_PAUSE:
2584         {
2585                 int res;
2586                 snd_pcm_stream_lock_irq(substream);
2587                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2588                 snd_pcm_stream_unlock_irq(substream);
2589                 return res;
2590         }
2591         }
2592         snd_printd("unknown ioctl = 0x%x\n", cmd);
2593         return -ENOTTY;
2594 }
2595
2596 static int snd_pcm_playback_ioctl1(struct file *file,
2597                                    struct snd_pcm_substream *substream,
2598                                    unsigned int cmd, void __user *arg)
2599 {
2600         if (snd_BUG_ON(!substream))
2601                 return -ENXIO;
2602         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2603                 return -EINVAL;
2604         switch (cmd) {
2605         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2606         {
2607                 struct snd_xferi xferi;
2608                 struct snd_xferi __user *_xferi = arg;
2609                 struct snd_pcm_runtime *runtime = substream->runtime;
2610                 snd_pcm_sframes_t result;
2611                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2612                         return -EBADFD;
2613                 if (put_user(0, &_xferi->result))
2614                         return -EFAULT;
2615                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2616                         return -EFAULT;
2617                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2618                 __put_user(result, &_xferi->result);
2619                 return result < 0 ? result : 0;
2620         }
2621         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2622         {
2623                 struct snd_xfern xfern;
2624                 struct snd_xfern __user *_xfern = arg;
2625                 struct snd_pcm_runtime *runtime = substream->runtime;
2626                 void __user **bufs;
2627                 snd_pcm_sframes_t result;
2628                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2629                         return -EBADFD;
2630                 if (runtime->channels > 128)
2631                         return -EINVAL;
2632                 if (put_user(0, &_xfern->result))
2633                         return -EFAULT;
2634                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2635                         return -EFAULT;
2636
2637                 bufs = memdup_user(xfern.bufs,
2638                                    sizeof(void *) * runtime->channels);
2639                 if (IS_ERR(bufs))
2640                         return PTR_ERR(bufs);
2641                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2642                 kfree(bufs);
2643                 __put_user(result, &_xfern->result);
2644                 return result < 0 ? result : 0;
2645         }
2646         case SNDRV_PCM_IOCTL_REWIND:
2647         {
2648                 snd_pcm_uframes_t frames;
2649                 snd_pcm_uframes_t __user *_frames = arg;
2650                 snd_pcm_sframes_t result;
2651                 if (get_user(frames, _frames))
2652                         return -EFAULT;
2653                 if (put_user(0, _frames))
2654                         return -EFAULT;
2655                 result = snd_pcm_playback_rewind(substream, frames);
2656                 __put_user(result, _frames);
2657                 return result < 0 ? result : 0;
2658         }
2659         case SNDRV_PCM_IOCTL_FORWARD:
2660         {
2661                 snd_pcm_uframes_t frames;
2662                 snd_pcm_uframes_t __user *_frames = arg;
2663                 snd_pcm_sframes_t result;
2664                 if (get_user(frames, _frames))
2665                         return -EFAULT;
2666                 if (put_user(0, _frames))
2667                         return -EFAULT;
2668                 result = snd_pcm_playback_forward(substream, frames);
2669                 __put_user(result, _frames);
2670                 return result < 0 ? result : 0;
2671         }
2672         }
2673         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2674 }
2675
2676 static int snd_pcm_capture_ioctl1(struct file *file,
2677                                   struct snd_pcm_substream *substream,
2678                                   unsigned int cmd, void __user *arg)
2679 {
2680         if (snd_BUG_ON(!substream))
2681                 return -ENXIO;
2682         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2683                 return -EINVAL;
2684         switch (cmd) {
2685         case SNDRV_PCM_IOCTL_READI_FRAMES:
2686         {
2687                 struct snd_xferi xferi;
2688                 struct snd_xferi __user *_xferi = arg;
2689                 struct snd_pcm_runtime *runtime = substream->runtime;
2690                 snd_pcm_sframes_t result;
2691                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2692                         return -EBADFD;
2693                 if (put_user(0, &_xferi->result))
2694                         return -EFAULT;
2695                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2696                         return -EFAULT;
2697                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2698                 __put_user(result, &_xferi->result);
2699                 return result < 0 ? result : 0;
2700         }
2701         case SNDRV_PCM_IOCTL_READN_FRAMES:
2702         {
2703                 struct snd_xfern xfern;
2704                 struct snd_xfern __user *_xfern = arg;
2705                 struct snd_pcm_runtime *runtime = substream->runtime;
2706                 void *bufs;
2707                 snd_pcm_sframes_t result;
2708                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2709                         return -EBADFD;
2710                 if (runtime->channels > 128)
2711                         return -EINVAL;
2712                 if (put_user(0, &_xfern->result))
2713                         return -EFAULT;
2714                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2715                         return -EFAULT;
2716
2717                 bufs = memdup_user(xfern.bufs,
2718                                    sizeof(void *) * runtime->channels);
2719                 if (IS_ERR(bufs))
2720                         return PTR_ERR(bufs);
2721                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2722                 kfree(bufs);
2723                 __put_user(result, &_xfern->result);
2724                 return result < 0 ? result : 0;
2725         }
2726         case SNDRV_PCM_IOCTL_REWIND:
2727         {
2728                 snd_pcm_uframes_t frames;
2729                 snd_pcm_uframes_t __user *_frames = arg;
2730                 snd_pcm_sframes_t result;
2731                 if (get_user(frames, _frames))
2732                         return -EFAULT;
2733                 if (put_user(0, _frames))
2734                         return -EFAULT;
2735                 result = snd_pcm_capture_rewind(substream, frames);
2736                 __put_user(result, _frames);
2737                 return result < 0 ? result : 0;
2738         }
2739         case SNDRV_PCM_IOCTL_FORWARD:
2740         {
2741                 snd_pcm_uframes_t frames;
2742                 snd_pcm_uframes_t __user *_frames = arg;
2743                 snd_pcm_sframes_t result;
2744                 if (get_user(frames, _frames))
2745                         return -EFAULT;
2746                 if (put_user(0, _frames))
2747                         return -EFAULT;
2748                 result = snd_pcm_capture_forward(substream, frames);
2749                 __put_user(result, _frames);
2750                 return result < 0 ? result : 0;
2751         }
2752         }
2753         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2754 }
2755
2756 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2757                                    unsigned long arg)
2758 {
2759         struct snd_pcm_file *pcm_file;
2760
2761         pcm_file = file->private_data;
2762
2763         if (((cmd >> 8) & 0xff) != 'A')
2764                 return -ENOTTY;
2765
2766         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2767                                        (void __user *)arg);
2768 }
2769
2770 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2771                                   unsigned long arg)
2772 {
2773         struct snd_pcm_file *pcm_file;
2774
2775         pcm_file = file->private_data;
2776
2777         if (((cmd >> 8) & 0xff) != 'A')
2778                 return -ENOTTY;
2779
2780         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2781                                       (void __user *)arg);
2782 }
2783
2784 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2785                          unsigned int cmd, void *arg)
2786 {
2787         mm_segment_t fs;
2788         int result;
2789
2790         fs = snd_enter_user();
2791         switch (substream->stream) {
2792         case SNDRV_PCM_STREAM_PLAYBACK:
2793                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2794                                                  (void __user *)arg);
2795                 break;
2796         case SNDRV_PCM_STREAM_CAPTURE:
2797                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2798                                                 (void __user *)arg);
2799                 break;
2800         default:
2801                 result = -EINVAL;
2802                 break;
2803         }
2804         snd_leave_user(fs);
2805         return result;
2806 }
2807
2808 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2809
2810 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2811                             loff_t * offset)
2812 {
2813         struct snd_pcm_file *pcm_file;
2814         struct snd_pcm_substream *substream;
2815         struct snd_pcm_runtime *runtime;
2816         snd_pcm_sframes_t result;
2817
2818         pcm_file = file->private_data;
2819         substream = pcm_file->substream;
2820         if (PCM_RUNTIME_CHECK(substream))
2821                 return -ENXIO;
2822         runtime = substream->runtime;
2823         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2824                 return -EBADFD;
2825         if (!frame_aligned(runtime, count))
2826                 return -EINVAL;
2827         count = bytes_to_frames(runtime, count);
2828         result = snd_pcm_lib_read(substream, buf, count);
2829         if (result > 0)
2830                 result = frames_to_bytes(runtime, result);
2831         return result;
2832 }
2833
2834 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2835                              size_t count, loff_t * offset)
2836 {
2837         struct snd_pcm_file *pcm_file;
2838         struct snd_pcm_substream *substream;
2839         struct snd_pcm_runtime *runtime;
2840         snd_pcm_sframes_t result;
2841
2842         pcm_file = file->private_data;
2843         substream = pcm_file->substream;
2844         if (PCM_RUNTIME_CHECK(substream))
2845                 return -ENXIO;
2846         runtime = substream->runtime;
2847         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2848                 return -EBADFD;
2849         if (!frame_aligned(runtime, count))
2850                 return -EINVAL;
2851         count = bytes_to_frames(runtime, count);
2852         result = snd_pcm_lib_write(substream, buf, count);
2853         if (result > 0)
2854                 result = frames_to_bytes(runtime, result);
2855         return result;
2856 }
2857
2858 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2859                              unsigned long nr_segs, loff_t pos)
2860
2861 {
2862         struct snd_pcm_file *pcm_file;
2863         struct snd_pcm_substream *substream;
2864         struct snd_pcm_runtime *runtime;
2865         snd_pcm_sframes_t result;
2866         unsigned long i;
2867         void __user **bufs;
2868         snd_pcm_uframes_t frames;
2869
2870         pcm_file = iocb->ki_filp->private_data;
2871         substream = pcm_file->substream;
2872         if (PCM_RUNTIME_CHECK(substream))
2873                 return -ENXIO;
2874         runtime = substream->runtime;
2875         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2876                 return -EBADFD;
2877         if (nr_segs > 1024 || nr_segs != runtime->channels)
2878                 return -EINVAL;
2879         if (!frame_aligned(runtime, iov->iov_len))
2880                 return -EINVAL;
2881         frames = bytes_to_samples(runtime, iov->iov_len);
2882         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2883         if (bufs == NULL)
2884                 return -ENOMEM;
2885         for (i = 0; i < nr_segs; ++i)
2886                 bufs[i] = iov[i].iov_base;
2887         result = snd_pcm_lib_readv(substream, bufs, frames);
2888         if (result > 0)
2889                 result = frames_to_bytes(runtime, result);
2890         kfree(bufs);
2891         return result;
2892 }
2893
2894 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2895                               unsigned long nr_segs, loff_t pos)
2896 {
2897         struct snd_pcm_file *pcm_file;
2898         struct snd_pcm_substream *substream;
2899         struct snd_pcm_runtime *runtime;
2900         snd_pcm_sframes_t result;
2901         unsigned long i;
2902         void __user **bufs;
2903         snd_pcm_uframes_t frames;
2904
2905         pcm_file = iocb->ki_filp->private_data;
2906         substream = pcm_file->substream;
2907         if (PCM_RUNTIME_CHECK(substream))
2908                 return -ENXIO;
2909         runtime = substream->runtime;
2910         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2911                 return -EBADFD;
2912         if (nr_segs > 128 || nr_segs != runtime->channels ||
2913             !frame_aligned(runtime, iov->iov_len))
2914                 return -EINVAL;
2915         frames = bytes_to_samples(runtime, iov->iov_len);
2916         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2917         if (bufs == NULL)
2918                 return -ENOMEM;
2919         for (i = 0; i < nr_segs; ++i)
2920                 bufs[i] = iov[i].iov_base;
2921         result = snd_pcm_lib_writev(substream, bufs, frames);
2922         if (result > 0)
2923                 result = frames_to_bytes(runtime, result);
2924         kfree(bufs);
2925         return result;
2926 }
2927
2928 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2929 {
2930         struct snd_pcm_file *pcm_file;
2931         struct snd_pcm_substream *substream;
2932         struct snd_pcm_runtime *runtime;
2933         unsigned int mask;
2934         snd_pcm_uframes_t avail;
2935
2936         pcm_file = file->private_data;
2937
2938         substream = pcm_file->substream;
2939         if (PCM_RUNTIME_CHECK(substream))
2940                 return -ENXIO;
2941         runtime = substream->runtime;
2942
2943         poll_wait(file, &runtime->sleep, wait);
2944
2945         snd_pcm_stream_lock_irq(substream);
2946         avail = snd_pcm_playback_avail(runtime);
2947         switch (runtime->status->state) {
2948         case SNDRV_PCM_STATE_RUNNING:
2949         case SNDRV_PCM_STATE_PREPARED:
2950         case SNDRV_PCM_STATE_PAUSED:
2951                 if (avail >= runtime->control->avail_min) {
2952                         mask = POLLOUT | POLLWRNORM;
2953                         break;
2954                 }
2955                 /* Fall through */
2956         case SNDRV_PCM_STATE_DRAINING:
2957                 mask = 0;
2958                 break;
2959         default:
2960                 mask = POLLOUT | POLLWRNORM | POLLERR;
2961                 break;
2962         }
2963         snd_pcm_stream_unlock_irq(substream);
2964         return mask;
2965 }
2966
2967 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2968 {
2969         struct snd_pcm_file *pcm_file;
2970         struct snd_pcm_substream *substream;
2971         struct snd_pcm_runtime *runtime;
2972         unsigned int mask;
2973         snd_pcm_uframes_t avail;
2974
2975         pcm_file = file->private_data;
2976
2977         substream = pcm_file->substream;
2978         if (PCM_RUNTIME_CHECK(substream))
2979                 return -ENXIO;
2980         runtime = substream->runtime;
2981
2982         poll_wait(file, &runtime->sleep, wait);
2983
2984         snd_pcm_stream_lock_irq(substream);
2985         avail = snd_pcm_capture_avail(runtime);
2986         switch (runtime->status->state) {
2987         case SNDRV_PCM_STATE_RUNNING:
2988         case SNDRV_PCM_STATE_PREPARED:
2989         case SNDRV_PCM_STATE_PAUSED:
2990                 if (avail >= runtime->control->avail_min) {
2991                         mask = POLLIN | POLLRDNORM;
2992                         break;
2993                 }
2994                 mask = 0;
2995                 break;
2996         case SNDRV_PCM_STATE_DRAINING:
2997                 if (avail > 0) {
2998                         mask = POLLIN | POLLRDNORM;
2999                         break;
3000                 }
3001                 /* Fall through */
3002         default:
3003                 mask = POLLIN | POLLRDNORM | POLLERR;
3004                 break;
3005         }
3006         snd_pcm_stream_unlock_irq(substream);
3007         return mask;
3008 }
3009
3010 /*
3011  * mmap support
3012  */
3013
3014 /*
3015  * Only on coherent architectures, we can mmap the status and the control records
3016  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3017  */
3018 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3019 /*
3020  * mmap status record
3021  */
3022 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3023                                                 struct vm_fault *vmf)
3024 {
3025         struct snd_pcm_substream *substream = area->vm_private_data;
3026         struct snd_pcm_runtime *runtime;
3027
3028         if (substream == NULL)
3029                 return VM_FAULT_SIGBUS;
3030         runtime = substream->runtime;
3031         vmf->page = virt_to_page(runtime->status);
3032         get_page(vmf->page);
3033         return 0;
3034 }
3035
3036 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3037 {
3038         .fault =        snd_pcm_mmap_status_fault,
3039 };
3040
3041 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3042                                struct vm_area_struct *area)
3043 {
3044         struct snd_pcm_runtime *runtime;
3045         long size;
3046         if (!(area->vm_flags & VM_READ))
3047                 return -EINVAL;
3048         runtime = substream->runtime;
3049         size = area->vm_end - area->vm_start;
3050         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3051                 return -EINVAL;
3052         area->vm_ops = &snd_pcm_vm_ops_status;
3053         area->vm_private_data = substream;
3054         area->vm_flags |= VM_RESERVED;
3055         return 0;
3056 }
3057
3058 /*
3059  * mmap control record
3060  */
3061 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3062                                                 struct vm_fault *vmf)
3063 {
3064         struct snd_pcm_substream *substream = area->vm_private_data;
3065         struct snd_pcm_runtime *runtime;
3066
3067         if (substream == NULL)
3068                 return VM_FAULT_SIGBUS;
3069         runtime = substream->runtime;
3070         vmf->page = virt_to_page(runtime->control);
3071         get_page(vmf->page);
3072         return 0;
3073 }
3074
3075 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3076 {
3077         .fault =        snd_pcm_mmap_control_fault,
3078 };
3079
3080 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3081                                 struct vm_area_struct *area)
3082 {
3083         struct snd_pcm_runtime *runtime;
3084         long size;
3085         if (!(area->vm_flags & VM_READ))
3086                 return -EINVAL;
3087         runtime = substream->runtime;
3088         size = area->vm_end - area->vm_start;
3089         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3090                 return -EINVAL;
3091         area->vm_ops = &snd_pcm_vm_ops_control;
3092         area->vm_private_data = substream;
3093         area->vm_flags |= VM_RESERVED;
3094         return 0;
3095 }
3096 #else /* ! coherent mmap */
3097 /*
3098  * don't support mmap for status and control records.
3099  */
3100 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3101                                struct vm_area_struct *area)
3102 {
3103         return -ENXIO;
3104 }
3105 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3106                                 struct vm_area_struct *area)
3107 {
3108         return -ENXIO;
3109 }
3110 #endif /* coherent mmap */
3111
3112 static inline struct page *
3113 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3114 {
3115         void *vaddr = substream->runtime->dma_area + ofs;
3116 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3117         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3118                 return virt_to_page(CAC_ADDR(vaddr));
3119 #endif
3120 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3121         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3122                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3123                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3124                 /* assume dma_handle set via pfn_to_phys() in
3125                  * mm/dma-noncoherent.c
3126                  */
3127                 return pfn_to_page(addr >> PAGE_SHIFT);
3128         }
3129 #endif
3130         return virt_to_page(vaddr);
3131 }
3132
3133 /*
3134  * fault callback for mmapping a RAM page
3135  */
3136 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3137                                                 struct vm_fault *vmf)
3138 {
3139         struct snd_pcm_substream *substream = area->vm_private_data;
3140         struct snd_pcm_runtime *runtime;
3141         unsigned long offset;
3142         struct page * page;
3143         size_t dma_bytes;
3144
3145         if (substream == NULL)
3146                 return VM_FAULT_SIGBUS;
3147         runtime = substream->runtime;
3148         offset = vmf->pgoff << PAGE_SHIFT;
3149         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3150         if (offset > dma_bytes - PAGE_SIZE)
3151                 return VM_FAULT_SIGBUS;
3152         if (substream->ops->page)
3153                 page = substream->ops->page(substream, offset);
3154         else
3155                 page = snd_pcm_default_page_ops(substream, offset);
3156         if (!page)
3157                 return VM_FAULT_SIGBUS;
3158         get_page(page);
3159         vmf->page = page;
3160         return 0;
3161 }
3162
3163 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3164         .open =         snd_pcm_mmap_data_open,
3165         .close =        snd_pcm_mmap_data_close,
3166 };
3167
3168 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3169         .open =         snd_pcm_mmap_data_open,
3170         .close =        snd_pcm_mmap_data_close,
3171         .fault =        snd_pcm_mmap_data_fault,
3172 };
3173
3174 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3175 /* This should be defined / handled globally! */
3176 #ifdef CONFIG_ARM
3177 #define ARCH_HAS_DMA_MMAP_COHERENT
3178 #endif
3179 #endif
3180
3181 /*
3182  * mmap the DMA buffer on RAM
3183  */
3184 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3185                                 struct vm_area_struct *area)
3186 {
3187         area->vm_flags |= VM_RESERVED;
3188 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3189         if (!substream->ops->page &&
3190             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3191                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3192                                          area,
3193                                          substream->runtime->dma_area,
3194                                          substream->runtime->dma_addr,
3195                                          area->vm_end - area->vm_start);
3196 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3197         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
3198             !plat_device_is_coherent(substream->dma_buffer.dev.dev))
3199                 area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3200 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3201         /* mmap with fault handler */
3202         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3203         return 0;
3204 }
3205
3206 /*
3207  * mmap the DMA buffer on I/O memory area
3208  */
3209 #if SNDRV_PCM_INFO_MMAP_IOMEM
3210 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3211                            struct vm_area_struct *area)
3212 {
3213         long size;
3214         unsigned long offset;
3215
3216         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3217         area->vm_flags |= VM_IO;
3218         size = area->vm_end - area->vm_start;
3219         offset = area->vm_pgoff << PAGE_SHIFT;
3220         if (io_remap_pfn_range(area, area->vm_start,
3221                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3222                                 size, area->vm_page_prot))
3223                 return -EAGAIN;
3224         return 0;
3225 }
3226
3227 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3228 #endif /* SNDRV_PCM_INFO_MMAP */
3229
3230 /* mmap callback with pgprot_noncached */
3231 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3232                                struct vm_area_struct *area)
3233 {
3234         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3235         return snd_pcm_default_mmap(substream, area);
3236 }
3237 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3238
3239 /*
3240  * mmap DMA buffer
3241  */
3242 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3243                       struct vm_area_struct *area)
3244 {
3245         struct snd_pcm_runtime *runtime;
3246         long size;
3247         unsigned long offset;
3248         size_t dma_bytes;
3249         int err;
3250
3251         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3252                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3253                         return -EINVAL;
3254         } else {
3255                 if (!(area->vm_flags & VM_READ))
3256                         return -EINVAL;
3257         }
3258         runtime = substream->runtime;
3259         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3260                 return -EBADFD;
3261         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3262                 return -ENXIO;
3263         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3264             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3265                 return -EINVAL;
3266         size = area->vm_end - area->vm_start;
3267         offset = area->vm_pgoff << PAGE_SHIFT;
3268         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3269         if ((size_t)size > dma_bytes)
3270                 return -EINVAL;
3271         if (offset > dma_bytes - size)
3272                 return -EINVAL;
3273
3274         area->vm_ops = &snd_pcm_vm_ops_data;
3275         area->vm_private_data = substream;
3276         if (substream->ops->mmap)
3277                 err = substream->ops->mmap(substream, area);
3278         else
3279                 err = snd_pcm_default_mmap(substream, area);
3280         if (!err)
3281                 atomic_inc(&substream->mmap_count);
3282         return err;
3283 }
3284
3285 EXPORT_SYMBOL(snd_pcm_mmap_data);
3286
3287 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3288 {
3289         struct snd_pcm_file * pcm_file;
3290         struct snd_pcm_substream *substream;
3291         unsigned long offset;
3292
3293         pcm_file = file->private_data;
3294         substream = pcm_file->substream;
3295         if (PCM_RUNTIME_CHECK(substream))
3296                 return -ENXIO;
3297
3298         offset = area->vm_pgoff << PAGE_SHIFT;
3299         switch (offset) {
3300         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3301                 if (pcm_file->no_compat_mmap)
3302                         return -ENXIO;
3303                 return snd_pcm_mmap_status(substream, file, area);
3304         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3305                 if (pcm_file->no_compat_mmap)
3306                         return -ENXIO;
3307                 return snd_pcm_mmap_control(substream, file, area);
3308         default:
3309                 return snd_pcm_mmap_data(substream, file, area);
3310         }
3311         return 0;
3312 }
3313
3314 static int snd_pcm_fasync(int fd, struct file * file, int on)
3315 {
3316         struct snd_pcm_file * pcm_file;
3317         struct snd_pcm_substream *substream;
3318         struct snd_pcm_runtime *runtime;
3319
3320         pcm_file = file->private_data;
3321         substream = pcm_file->substream;
3322         if (PCM_RUNTIME_CHECK(substream))
3323                 return -ENXIO;
3324         runtime = substream->runtime;
3325         return fasync_helper(fd, file, on, &runtime->fasync);
3326 }
3327
3328 /*
3329  * ioctl32 compat
3330  */
3331 #ifdef CONFIG_COMPAT
3332 #include "pcm_compat.c"
3333 #else
3334 #define snd_pcm_ioctl_compat    NULL
3335 #endif
3336
3337 /*
3338  *  To be removed helpers to keep binary compatibility
3339  */
3340
3341 #ifdef CONFIG_SND_SUPPORT_OLD_API
3342 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3343 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3344
3345 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3346                                                struct snd_pcm_hw_params_old *oparams)
3347 {
3348         unsigned int i;
3349
3350         memset(params, 0, sizeof(*params));
3351         params->flags = oparams->flags;
3352         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3353                 params->masks[i].bits[0] = oparams->masks[i];
3354         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3355         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3356         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3357         params->info = oparams->info;
3358         params->msbits = oparams->msbits;
3359         params->rate_num = oparams->rate_num;
3360         params->rate_den = oparams->rate_den;
3361         params->fifo_size = oparams->fifo_size;
3362 }
3363
3364 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3365                                              struct snd_pcm_hw_params *params)
3366 {
3367         unsigned int i;
3368
3369         memset(oparams, 0, sizeof(*oparams));
3370         oparams->flags = params->flags;
3371         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3372                 oparams->masks[i] = params->masks[i].bits[0];
3373         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3374         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3375         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3376         oparams->info = params->info;
3377         oparams->msbits = params->msbits;
3378         oparams->rate_num = params->rate_num;
3379         oparams->rate_den = params->rate_den;
3380         oparams->fifo_size = params->fifo_size;
3381 }
3382
3383 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3384                                       struct snd_pcm_hw_params_old __user * _oparams)
3385 {
3386         struct snd_pcm_hw_params *params;
3387         struct snd_pcm_hw_params_old *oparams = NULL;
3388         int err;
3389
3390         params = kmalloc(sizeof(*params), GFP_KERNEL);
3391         if (!params)
3392                 return -ENOMEM;
3393
3394         oparams = memdup_user(_oparams, sizeof(*oparams));
3395         if (IS_ERR(oparams)) {
3396                 err = PTR_ERR(oparams);
3397                 goto out;
3398         }
3399         snd_pcm_hw_convert_from_old_params(params, oparams);
3400         err = snd_pcm_hw_refine(substream, params);
3401         snd_pcm_hw_convert_to_old_params(oparams, params);
3402         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3403                 if (!err)
3404                         err = -EFAULT;
3405         }
3406
3407         kfree(oparams);
3408 out:
3409         kfree(params);
3410         return err;
3411 }
3412
3413 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3414                                       struct snd_pcm_hw_params_old __user * _oparams)
3415 {
3416         struct snd_pcm_hw_params *params;
3417         struct snd_pcm_hw_params_old *oparams = NULL;
3418         int err;
3419
3420         params = kmalloc(sizeof(*params), GFP_KERNEL);
3421         if (!params)
3422                 return -ENOMEM;
3423
3424         oparams = memdup_user(_oparams, sizeof(*oparams));
3425         if (IS_ERR(oparams)) {
3426                 err = PTR_ERR(oparams);
3427                 goto out;
3428         }
3429         snd_pcm_hw_convert_from_old_params(params, oparams);
3430         err = snd_pcm_hw_params(substream, params);
3431         snd_pcm_hw_convert_to_old_params(oparams, params);
3432         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3433                 if (!err)
3434                         err = -EFAULT;
3435         }
3436
3437         kfree(oparams);
3438 out:
3439         kfree(params);
3440         return err;
3441 }
3442 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3443
3444 #ifndef CONFIG_MMU
3445 static unsigned long snd_pcm_get_unmapped_area(struct file *file,
3446                                                unsigned long addr,
3447                                                unsigned long len,
3448                                                unsigned long pgoff,
3449                                                unsigned long flags)
3450 {
3451         struct snd_pcm_file *pcm_file = file->private_data;
3452         struct snd_pcm_substream *substream = pcm_file->substream;
3453         struct snd_pcm_runtime *runtime = substream->runtime;
3454         unsigned long offset = pgoff << PAGE_SHIFT;
3455
3456         switch (offset) {
3457         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3458                 return (unsigned long)runtime->status;
3459         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3460                 return (unsigned long)runtime->control;
3461         default:
3462                 return (unsigned long)runtime->dma_area + offset;
3463         }
3464 }
3465 #else
3466 # define snd_pcm_get_unmapped_area NULL
3467 #endif
3468
3469 /*
3470  *  Register section
3471  */
3472
3473 const struct file_operations snd_pcm_f_ops[2] = {
3474         {
3475                 .owner =                THIS_MODULE,
3476                 .write =                snd_pcm_write,
3477                 .aio_write =            snd_pcm_aio_write,
3478                 .open =                 snd_pcm_playback_open,
3479                 .release =              snd_pcm_release,
3480                 .llseek =               no_llseek,
3481                 .poll =                 snd_pcm_playback_poll,
3482                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3483                 .compat_ioctl =         snd_pcm_ioctl_compat,
3484                 .mmap =                 snd_pcm_mmap,
3485                 .fasync =               snd_pcm_fasync,
3486                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3487         },
3488         {
3489                 .owner =                THIS_MODULE,
3490                 .read =                 snd_pcm_read,
3491                 .aio_read =             snd_pcm_aio_read,
3492                 .open =                 snd_pcm_capture_open,
3493                 .release =              snd_pcm_release,
3494                 .llseek =               no_llseek,
3495                 .poll =                 snd_pcm_capture_poll,
3496                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3497                 .compat_ioctl =         snd_pcm_ioctl_compat,
3498                 .mmap =                 snd_pcm_mmap,
3499                 .fasync =               snd_pcm_fasync,
3500                 .get_unmapped_area =    snd_pcm_get_unmapped_area,
3501         }
3502 };