sound/core/pcm_native.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/slab.h>
  25 #include <linux/smp_lock.h>
  26 #include <linux/time.h>
  27 #include <linux/pm_qos_params.h>
  28 #include <linux/uio.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/math64.h>
  31 #include <sound/core.h>
  32 #include <sound/control.h>
  33 #include <sound/info.h>
  34 #include <sound/pcm.h>
  35 #include <sound/pcm_params.h>
  36 #include <sound/timer.h>
  37 #include <sound/minors.h>
  38 #include <asm/io.h>
  39
  40 /*
  41  *  Compatibility
  42  */
  43
  44 struct snd_pcm_hw_params_old {
  45         unsigned int flags;
  46         unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
  47                            SNDRV_PCM_HW_PARAM_ACCESS + 1];
  48         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
  49                                         SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
  50         unsigned int rmask;
  51         unsigned int cmask;
  52         unsigned int info;
  53         unsigned int msbits;
  54         unsigned int rate_num;
  55         unsigned int rate_den;
  56         snd_pcm_uframes_t fifo_size;
  57         unsigned char reserved[64];
  58 };
  59
  60 #ifdef CONFIG_SND_SUPPORT_OLD_API
  61 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
  62 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
  63
  64 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
  65                                       struct snd_pcm_hw_params_old __user * _oparams);
  66 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  67                                       struct snd_pcm_hw_params_old __user * _oparams);
  68 #endif
  69 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
  70
  71 /*
  72  *
  73  */
  74
  75 DEFINE_RWLOCK(snd_pcm_link_rwlock);
  76 EXPORT_SYMBOL(snd_pcm_link_rwlock);
  77
  78 static DECLARE_RWSEM(snd_pcm_link_rwsem);
  79
  80 static inline mm_segment_t snd_enter_user(void)
  81 {
  82         mm_segment_t fs = get_fs();
  83         set_fs(get_ds());
  84         return fs;
  85 }
  86
  87 static inline void snd_leave_user(mm_segment_t fs)
  88 {
  89         set_fs(fs);
  90 }
  91
  92
  93
  94 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
  95 {
  96         struct snd_pcm_runtime *runtime;
  97         struct snd_pcm *pcm = substream->pcm;
  98         struct snd_pcm_str *pstr = substream->pstr;
  99
 100         memset(info, 0, sizeof(*info));
 101         info->card = pcm->card->number;
 102         info->device = pcm->device;
 103         info->stream = substream->stream;
 104         info->subdevice = substream->number;
 105         strlcpy(info->id, pcm->id, sizeof(info->id));
 106         strlcpy(info->name, pcm->name, sizeof(info->name));
 107         info->dev_class = pcm->dev_class;
 108         info->dev_subclass = pcm->dev_subclass;
 109         info->subdevices_count = pstr->substream_count;
 110         info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
 111         strlcpy(info->subname, substream->name, sizeof(info->subname));
 112         runtime = substream->runtime;
 113         /* AB: FIXME!!! This is definitely nonsense */
 114         if (runtime) {
 115                 info->sync = runtime->sync;
 116                 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
 117         }
 118         return 0;
 119 }
 120
 121 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 122                       struct snd_pcm_info __user * _info)
 123 {
 124         struct snd_pcm_info *info;
 125         int err;
 126
 127         info = kmalloc(sizeof(*info), GFP_KERNEL);
 128         if (! info)
 129                 return -ENOMEM;
 130         err = snd_pcm_info(substream, info);
 131         if (err >= 0) {
 132                 if (copy_to_user(_info, info, sizeof(*info)))
 133                         err = -EFAULT;
 134         }
 135         kfree(info);
 136         return err;
 137 }
 138
 139 #undef RULES_DEBUG
 140
 141 #ifdef RULES_DEBUG
 142 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
 143 char *snd_pcm_hw_param_names[] = {
 144         HW_PARAM(ACCESS),
 145         HW_PARAM(FORMAT),
 146         HW_PARAM(SUBFORMAT),
 147         HW_PARAM(SAMPLE_BITS),
 148         HW_PARAM(FRAME_BITS),
 149         HW_PARAM(CHANNELS),
 150         HW_PARAM(RATE),
 151         HW_PARAM(PERIOD_TIME),
 152         HW_PARAM(PERIOD_SIZE),
 153         HW_PARAM(PERIOD_BYTES),
 154         HW_PARAM(PERIODS),
 155         HW_PARAM(BUFFER_TIME),
 156         HW_PARAM(BUFFER_SIZE),
 157         HW_PARAM(BUFFER_BYTES),
 158         HW_PARAM(TICK_TIME),
 159 };
 160 #endif
 161
 162 int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
 163                       struct snd_pcm_hw_params *params)
 164 {
 165         unsigned int k;
 166         struct snd_pcm_hardware *hw;
 167         struct snd_interval *i = NULL;
 168         struct snd_mask *m = NULL;
 169         struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
 170         unsigned int rstamps[constrs->rules_num];
 171         unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
 172         unsigned int stamp = 2;
 173         int changed, again;
 174
 175         params->info = 0;
 176         params->fifo_size = 0;
 177         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
 178                 params->msbits = 0;
 179         if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
 180                 params->rate_num = 0;
 181                 params->rate_den = 0;
 182         }
 183
 184         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
 185                 m = hw_param_mask(params, k);
 186                 if (snd_mask_empty(m))
 187                         return -EINVAL;
 188                 if (!(params->rmask & (1 << k)))
 189                         continue;
 190 #ifdef RULES_DEBUG
 191                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 192                 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 193 #endif
 194                 changed = snd_mask_refine(m, constrs_mask(constrs, k));
 195 #ifdef RULES_DEBUG
 196                 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
 197 #endif
 198                 if (changed)
 199                         params->cmask |= 1 << k;
 200                 if (changed < 0)
 201                         return changed;
 202         }
 203
 204         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
 205                 i = hw_param_interval(params, k);
 206                 if (snd_interval_empty(i))
 207                         return -EINVAL;
 208                 if (!(params->rmask & (1 << k)))
 209                         continue;
 210 #ifdef RULES_DEBUG
 211                 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
 212                 if (i->empty)
 213                         printk("empty");
 214                 else
 215                         printk("%c%u %u%c",
 216                                i->openmin ? '(' : '[', i->min,
 217                                i->max, i->openmax ? ')' : ']');
 218                 printk(" -> ");
 219 #endif
 220                 changed = snd_interval_refine(i, constrs_interval(constrs, k));
 221 #ifdef RULES_DEBUG
 222                 if (i->empty)
 223                         printk("empty\n");
 224                 else
 225                         printk("%c%u %u%c\n",
 226                                i->openmin ? '(' : '[', i->min,
 227                                i->max, i->openmax ? ')' : ']');
 228 #endif
 229                 if (changed)
 230                         params->cmask |= 1 << k;
 231                 if (changed < 0)
 232                         return changed;
 233         }
 234
 235         for (k = 0; k < constrs->rules_num; k++)
 236                 rstamps[k] = 0;
 237         for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
 238                 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
 239         do {
 240                 again = 0;
 241                 for (k = 0; k < constrs->rules_num; k++) {
 242                         struct snd_pcm_hw_rule *r = &constrs->rules[k];
 243                         unsigned int d;
 244                         int doit = 0;
 245                         if (r->cond && !(r->cond & params->flags))
 246                                 continue;
 247                         for (d = 0; r->deps[d] >= 0; d++) {
 248                                 if (vstamps[r->deps[d]] > rstamps[k]) {
 249                                         doit = 1;
 250                                         break;
 251                                 }
 252                         }
 253                         if (!doit)
 254                                 continue;
 255 #ifdef RULES_DEBUG
 256                         printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
 257                         if (r->var >= 0) {
 258                                 printk("%s = ", snd_pcm_hw_param_names[r->var]);
 259                                 if (hw_is_mask(r->var)) {
 260                                         m = hw_param_mask(params, r->var);
 261                                         printk("%x", *m->bits);
 262                                 } else {
 263                                         i = hw_param_interval(params, r->var);
 264                                         if (i->empty)
 265                                                 printk("empty");
 266                                         else
 267                                                 printk("%c%u %u%c",
 268                                                        i->openmin ? '(' : '[', i->min,
 269                                                        i->max, i->openmax ? ')' : ']');
 270                                 }
 271                         }
 272 #endif
 273                         changed = r->func(params, r);
 274 #ifdef RULES_DEBUG
 275                         if (r->var >= 0) {
 276                                 printk(" -> ");
 277                                 if (hw_is_mask(r->var))
 278                                         printk("%x", *m->bits);
 279                                 else {
 280                                         if (i->empty)
 281                                                 printk("empty");
 282                                         else
 283                                                 printk("%c%u %u%c",
 284                                                        i->openmin ? '(' : '[', i->min,
 285                                                        i->max, i->openmax ? ')' : ']');
 286                                 }
 287                         }
 288                         printk("\n");
 289 #endif
 290                         rstamps[k] = stamp;
 291                         if (changed && r->var >= 0) {
 292                                 params->cmask |= (1 << r->var);
 293                                 vstamps[r->var] = stamp;
 294                                 again = 1;
 295                         }
 296                         if (changed < 0)
 297                                 return changed;
 298                         stamp++;
 299                 }
 300         } while (again);
 301         if (!params->msbits) {
 302                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 303                 if (snd_interval_single(i))
 304                         params->msbits = snd_interval_value(i);
 305         }
 306
 307         if (!params->rate_den) {
 308                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 309                 if (snd_interval_single(i)) {
 310                         params->rate_num = snd_interval_value(i);
 311                         params->rate_den = 1;
 312                 }
 313         }
 314
 315         hw = &substream->runtime->hw;
 316         if (!params->info)
 317                 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
 318         if (!params->fifo_size) {
 319                 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 320                 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 321                 if (snd_mask_min(m) == snd_mask_max(m) &&
 322                     snd_interval_min(i) == snd_interval_max(i)) {
 323                         changed = substream->ops->ioctl(substream,
 324                                         SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
 325                         if (changed < 0)
 326                                 return changed;
 327                 }
 328         }
 329         params->rmask = 0;
 330         return 0;
 331 }
 332
 333 EXPORT_SYMBOL(snd_pcm_hw_refine);
 334
 335 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
 336                                   struct snd_pcm_hw_params __user * _params)
 337 {
 338         struct snd_pcm_hw_params *params;
 339         int err;
 340
 341         params = memdup_user(_params, sizeof(*params));
 342         if (IS_ERR(params))
 343                 return PTR_ERR(params);
 344
 345         err = snd_pcm_hw_refine(substream, params);
 346         if (copy_to_user(_params, params, sizeof(*params))) {
 347                 if (!err)
 348                         err = -EFAULT;
 349         }
 350
 351         kfree(params);
 352         return err;
 353 }
 354
 355 static int period_to_usecs(struct snd_pcm_runtime *runtime)
 356 {
 357         int usecs;
 358
 359         if (! runtime->rate)
 360                 return -1; /* invalid */
 361
 362         /* take 75% of period time as the deadline */
 363         usecs = (750000 / runtime->rate) * runtime->period_size;
 364         usecs += ((750000 % runtime->rate) * runtime->period_size) /
 365                 runtime->rate;
 366
 367         return usecs;
 368 }
 369
 370 static int calc_boundary(struct snd_pcm_runtime *runtime)
 371 {
 372         u_int64_t boundary;
 373
 374         boundary = (u_int64_t)runtime->buffer_size *
 375                    (u_int64_t)runtime->period_size;
 376 #if BITS_PER_LONG < 64
 377         /* try to find lowest common multiple for buffer and period */
 378         if (boundary > LONG_MAX - runtime->buffer_size) {
 379                 u_int32_t remainder = -1;
 380                 u_int32_t divident = runtime->buffer_size;
 381                 u_int32_t divisor = runtime->period_size;
 382                 while (remainder) {
 383                         remainder = divident % divisor;
 384                         if (remainder) {
 385                                 divident = divisor;
 386                                 divisor = remainder;
 387                         }
 388                 }
 389                 boundary = div_u64(boundary, divisor);
 390                 if (boundary > LONG_MAX - runtime->buffer_size)
 391                         return -ERANGE;
 392         }
 393 #endif
 394         if (boundary == 0)
 395                 return -ERANGE;
 396         runtime->boundary = boundary;
 397         while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
 398                 runtime->boundary *= 2;
 399         return 0;
 400 }
 401
 402 static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
 403                              struct snd_pcm_hw_params *params)
 404 {
 405         struct snd_pcm_runtime *runtime;
 406         int err, usecs;
 407         unsigned int bits;
 408         snd_pcm_uframes_t frames;
 409
 410         if (PCM_RUNTIME_CHECK(substream))
 411                 return -ENXIO;
 412         runtime = substream->runtime;
 413         snd_pcm_stream_lock_irq(substream);
 414         switch (runtime->status->state) {
 415         case SNDRV_PCM_STATE_OPEN:
 416         case SNDRV_PCM_STATE_SETUP:
 417         case SNDRV_PCM_STATE_PREPARED:
 418                 break;
 419         default:
 420                 snd_pcm_stream_unlock_irq(substream);
 421                 return -EBADFD;
 422         }
 423         snd_pcm_stream_unlock_irq(substream);
 424 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 425         if (!substream->oss.oss)
 426 #endif
 427                 if (atomic_read(&substream->mmap_count))
 428                         return -EBADFD;
 429
 430         params->rmask = ~0U;
 431         err = snd_pcm_hw_refine(substream, params);
 432         if (err < 0)
 433                 goto _error;
 434
 435         err = snd_pcm_hw_params_choose(substream, params);
 436         if (err < 0)
 437                 goto _error;
 438
 439         if (substream->ops->hw_params != NULL) {
 440                 err = substream->ops->hw_params(substream, params);
 441                 if (err < 0)
 442                         goto _error;
 443         }
 444
 445         runtime->access = params_access(params);
 446         runtime->format = params_format(params);
 447         runtime->subformat = params_subformat(params);
 448         runtime->channels = params_channels(params);
 449         runtime->rate = params_rate(params);
 450         runtime->period_size = params_period_size(params);
 451         runtime->periods = params_periods(params);
 452         runtime->buffer_size = params_buffer_size(params);
 453         runtime->info = params->info;
 454         runtime->rate_num = params->rate_num;
 455         runtime->rate_den = params->rate_den;
 456
 457         bits = snd_pcm_format_physical_width(runtime->format);
 458         runtime->sample_bits = bits;
 459         bits *= runtime->channels;
 460         runtime->frame_bits = bits;
 461         frames = 1;
 462         while (bits % 8 != 0) {
 463                 bits *= 2;
 464                 frames *= 2;
 465         }
 466         runtime->byte_align = bits / 8;
 467         runtime->min_align = frames;
 468
 469         /* Default sw params */
 470         runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
 471         runtime->period_step = 1;
 472         runtime->control->avail_min = runtime->period_size;
 473         runtime->start_threshold = 1;
 474         runtime->stop_threshold = runtime->buffer_size;
 475         runtime->silence_threshold = 0;
 476         runtime->silence_size = 0;
 477         err = calc_boundary(runtime);
 478         if (err < 0)
 479                 goto _error;
 480
 481         snd_pcm_timer_resolution_change(substream);
 482         runtime->status->state = SNDRV_PCM_STATE_SETUP;
 483
 484         if (substream->latency_pm_qos_req) {
 485                 pm_qos_remove_request(substream->latency_pm_qos_req);
 486                 substream->latency_pm_qos_req = NULL;
 487         }
 488         if ((usecs = period_to_usecs(runtime)) >= 0)
 489                 substream->latency_pm_qos_req = pm_qos_add_request(
 490                                         PM_QOS_CPU_DMA_LATENCY, usecs);
 491         return 0;
 492  _error:
 493         /* hardware might be unuseable from this time,
 494            so we force application to retry to set
 495            the correct hardware parameter settings */
 496         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 497         if (substream->ops->hw_free != NULL)
 498                 substream->ops->hw_free(substream);
 499         return err;
 500 }
 501
 502 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
 503                                   struct snd_pcm_hw_params __user * _params)
 504 {
 505         struct snd_pcm_hw_params *params;
 506         int err;
 507
 508         params = memdup_user(_params, sizeof(*params));
 509         if (IS_ERR(params))
 510                 return PTR_ERR(params);
 511
 512         err = snd_pcm_hw_params(substream, params);
 513         if (copy_to_user(_params, params, sizeof(*params))) {
 514                 if (!err)
 515                         err = -EFAULT;
 516         }
 517
 518         kfree(params);
 519         return err;
 520 }
 521
 522 static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
 523 {
 524         struct snd_pcm_runtime *runtime;
 525         int result = 0;
 526
 527         if (PCM_RUNTIME_CHECK(substream))
 528                 return -ENXIO;
 529         runtime = substream->runtime;
 530         snd_pcm_stream_lock_irq(substream);
 531         switch (runtime->status->state) {
 532         case SNDRV_PCM_STATE_SETUP:
 533         case SNDRV_PCM_STATE_PREPARED:
 534                 break;
 535         default:
 536                 snd_pcm_stream_unlock_irq(substream);
 537                 return -EBADFD;
 538         }
 539         snd_pcm_stream_unlock_irq(substream);
 540         if (atomic_read(&substream->mmap_count))
 541                 return -EBADFD;
 542         if (substream->ops->hw_free)
 543                 result = substream->ops->hw_free(substream);
 544         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 545         pm_qos_remove_request(substream->latency_pm_qos_req);
 546         substream->latency_pm_qos_req = NULL;
 547         return result;
 548 }
 549
 550 static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
 551                              struct snd_pcm_sw_params *params)
 552 {
 553         struct snd_pcm_runtime *runtime;
 554         int err;
 555
 556         if (PCM_RUNTIME_CHECK(substream))
 557                 return -ENXIO;
 558         runtime = substream->runtime;
 559         snd_pcm_stream_lock_irq(substream);
 560         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 561                 snd_pcm_stream_unlock_irq(substream);
 562                 return -EBADFD;
 563         }
 564         snd_pcm_stream_unlock_irq(substream);
 565
 566         if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
 567                 return -EINVAL;
 568         if (params->avail_min == 0)
 569                 return -EINVAL;
 570         if (params->silence_size >= runtime->boundary) {
 571                 if (params->silence_threshold != 0)
 572                         return -EINVAL;
 573         } else {
 574                 if (params->silence_size > params->silence_threshold)
 575                         return -EINVAL;
 576                 if (params->silence_threshold > runtime->buffer_size)
 577                         return -EINVAL;
 578         }
 579         err = 0;
 580         snd_pcm_stream_lock_irq(substream);
 581         runtime->tstamp_mode = params->tstamp_mode;
 582         runtime->period_step = params->period_step;
 583         runtime->control->avail_min = params->avail_min;
 584         runtime->start_threshold = params->start_threshold;
 585         runtime->stop_threshold = params->stop_threshold;
 586         runtime->silence_threshold = params->silence_threshold;
 587         runtime->silence_size = params->silence_size;
 588         params->boundary = runtime->boundary;
 589         if (snd_pcm_running(substream)) {
 590                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 591                     runtime->silence_size > 0)
 592                         snd_pcm_playback_silence(substream, ULONG_MAX);
 593                 err = snd_pcm_update_state(substream, runtime);
 594         }
 595         snd_pcm_stream_unlock_irq(substream);
 596         return err;
 597 }
 598
 599 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
 600                                   struct snd_pcm_sw_params __user * _params)
 601 {
 602         struct snd_pcm_sw_params params;
 603         int err;
 604         if (copy_from_user(&params, _params, sizeof(params)))
 605                 return -EFAULT;
 606         err = snd_pcm_sw_params(substream, &params);
 607         if (copy_to_user(_params, &params, sizeof(params)))
 608                 return -EFAULT;
 609         return err;
 610 }
 611
 612 int snd_pcm_status(struct snd_pcm_substream *substream,
 613                    struct snd_pcm_status *status)
 614 {
 615         struct snd_pcm_runtime *runtime = substream->runtime;
 616
 617         snd_pcm_stream_lock_irq(substream);
 618         status->state = runtime->status->state;
 619         status->suspended_state = runtime->status->suspended_state;
 620         if (status->state == SNDRV_PCM_STATE_OPEN)
 621                 goto _end;
 622         status->trigger_tstamp = runtime->trigger_tstamp;
 623         if (snd_pcm_running(substream)) {
 624                 snd_pcm_update_hw_ptr(substream);
 625                 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
 626                         status->tstamp = runtime->status->tstamp;
 627                         goto _tstamp_end;
 628                 }
 629         }
 630         snd_pcm_gettime(runtime, &status->tstamp);
 631  _tstamp_end:
 632         status->appl_ptr = runtime->control->appl_ptr;
 633         status->hw_ptr = runtime->status->hw_ptr;
 634         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 635                 status->avail = snd_pcm_playback_avail(runtime);
 636                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 637                     runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 638                         status->delay = runtime->buffer_size - status->avail;
 639                         status->delay += runtime->delay;
 640                 } else
 641                         status->delay = 0;
 642         } else {
 643                 status->avail = snd_pcm_capture_avail(runtime);
 644                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
 645                         status->delay = status->avail + runtime->delay;
 646                 else
 647                         status->delay = 0;
 648         }
 649         status->avail_max = runtime->avail_max;
 650         status->overrange = runtime->overrange;
 651         runtime->avail_max = 0;
 652         runtime->overrange = 0;
 653  _end:
 654         snd_pcm_stream_unlock_irq(substream);
 655         return 0;
 656 }
 657
 658 static int snd_pcm_status_user(struct snd_pcm_substream *substream,
 659                                struct snd_pcm_status __user * _status)
 660 {
 661         struct snd_pcm_status status;
 662         int res;
 663
 664         memset(&status, 0, sizeof(status));
 665         res = snd_pcm_status(substream, &status);
 666         if (res < 0)
 667                 return res;
 668         if (copy_to_user(_status, &status, sizeof(status)))
 669                 return -EFAULT;
 670         return 0;
 671 }
 672
 673 static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
 674                                 struct snd_pcm_channel_info * info)
 675 {
 676         struct snd_pcm_runtime *runtime;
 677         unsigned int channel;
 678
 679         channel = info->channel;
 680         runtime = substream->runtime;
 681         snd_pcm_stream_lock_irq(substream);
 682         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 683                 snd_pcm_stream_unlock_irq(substream);
 684                 return -EBADFD;
 685         }
 686         snd_pcm_stream_unlock_irq(substream);
 687         if (channel >= runtime->channels)
 688                 return -EINVAL;
 689         memset(info, 0, sizeof(*info));
 690         info->channel = channel;
 691         return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
 692 }
 693
 694 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 695                                      struct snd_pcm_channel_info __user * _info)
 696 {
 697         struct snd_pcm_channel_info info;
 698         int res;
 699
 700         if (copy_from_user(&info, _info, sizeof(info)))
 701                 return -EFAULT;
 702         res = snd_pcm_channel_info(substream, &info);
 703         if (res < 0)
 704                 return res;
 705         if (copy_to_user(_info, &info, sizeof(info)))
 706                 return -EFAULT;
 707         return 0;
 708 }
 709
 710 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
 711 {
 712         struct snd_pcm_runtime *runtime = substream->runtime;
 713         if (runtime->trigger_master == NULL)
 714                 return;
 715         if (runtime->trigger_master == substream) {
 716                 snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
 717         } else {
 718                 snd_pcm_trigger_tstamp(runtime->trigger_master);
 719                 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
 720         }
 721         runtime->trigger_master = NULL;
 722 }
 723
 724 struct action_ops {
 725         int (*pre_action)(struct snd_pcm_substream *substream, int state);
 726         int (*do_action)(struct snd_pcm_substream *substream, int state);
 727         void (*undo_action)(struct snd_pcm_substream *substream, int state);
 728         void (*post_action)(struct snd_pcm_substream *substream, int state);
 729 };
 730
 731 /*
 732  *  this functions is core for handling of linked stream
 733  *  Note: the stream state might be changed also on failure
 734  *  Note2: call with calling stream lock + link lock
 735  */
 736 static int snd_pcm_action_group(struct action_ops *ops,
 737                                 struct snd_pcm_substream *substream,
 738                                 int state, int do_lock)
 739 {
 740         struct snd_pcm_substream *s = NULL;
 741         struct snd_pcm_substream *s1;
 742         int res = 0;
 743
 744         snd_pcm_group_for_each_entry(s, substream) {
 745                 if (do_lock && s != substream)
 746                         spin_lock_nested(&s->self_group.lock,
 747                                          SINGLE_DEPTH_NESTING);
 748                 res = ops->pre_action(s, state);
 749                 if (res < 0)
 750                         goto _unlock;
 751         }
 752         snd_pcm_group_for_each_entry(s, substream) {
 753                 res = ops->do_action(s, state);
 754                 if (res < 0) {
 755                         if (ops->undo_action) {
 756                                 snd_pcm_group_for_each_entry(s1, substream) {
 757                                         if (s1 == s) /* failed stream */
 758                                                 break;
 759                                         ops->undo_action(s1, state);
 760                                 }
 761                         }
 762                         s = NULL; /* unlock all */
 763                         goto _unlock;
 764                 }
 765         }
 766         snd_pcm_group_for_each_entry(s, substream) {
 767                 ops->post_action(s, state);
 768         }
 769  _unlock:
 770         if (do_lock) {
 771                 /* unlock streams */
 772                 snd_pcm_group_for_each_entry(s1, substream) {
 773                         if (s1 != substream)
 774                                 spin_unlock(&s1->self_group.lock);
 775                         if (s1 == s)    /* end */
 776                                 break;
 777                 }
 778         }
 779         return res;
 780 }
 781
 782 /*
 783  *  Note: call with stream lock
 784  */
 785 static int snd_pcm_action_single(struct action_ops *ops,
 786                                  struct snd_pcm_substream *substream,
 787                                  int state)
 788 {
 789         int res;
 790
 791         res = ops->pre_action(substream, state);
 792         if (res < 0)
 793                 return res;
 794         res = ops->do_action(substream, state);
 795         if (res == 0)
 796                 ops->post_action(substream, state);
 797         else if (ops->undo_action)
 798                 ops->undo_action(substream, state);
 799         return res;
 800 }
 801
 802 /*
 803  *  Note: call with stream lock
 804  */
 805 static int snd_pcm_action(struct action_ops *ops,
 806                           struct snd_pcm_substream *substream,
 807                           int state)
 808 {
 809         int res;
 810
 811         if (snd_pcm_stream_linked(substream)) {
 812                 if (!spin_trylock(&substream->group->lock)) {
 813                         spin_unlock(&substream->self_group.lock);
 814                         spin_lock(&substream->group->lock);
 815                         spin_lock(&substream->self_group.lock);
 816                 }
 817                 res = snd_pcm_action_group(ops, substream, state, 1);
 818                 spin_unlock(&substream->group->lock);
 819         } else {
 820                 res = snd_pcm_action_single(ops, substream, state);
 821         }
 822         return res;
 823 }
 824
 825 /*
 826  *  Note: don't use any locks before
 827  */
 828 static int snd_pcm_action_lock_irq(struct action_ops *ops,
 829                                    struct snd_pcm_substream *substream,
 830                                    int state)
 831 {
 832         int res;
 833
 834         read_lock_irq(&snd_pcm_link_rwlock);
 835         if (snd_pcm_stream_linked(substream)) {
 836                 spin_lock(&substream->group->lock);
 837                 spin_lock(&substream->self_group.lock);
 838                 res = snd_pcm_action_group(ops, substream, state, 1);
 839                 spin_unlock(&substream->self_group.lock);
 840                 spin_unlock(&substream->group->lock);
 841         } else {
 842                 spin_lock(&substream->self_group.lock);
 843                 res = snd_pcm_action_single(ops, substream, state);
 844                 spin_unlock(&substream->self_group.lock);
 845         }
 846         read_unlock_irq(&snd_pcm_link_rwlock);
 847         return res;
 848 }
 849
 850 /*
 851  */
 852 static int snd_pcm_action_nonatomic(struct action_ops *ops,
 853                                     struct snd_pcm_substream *substream,
 854                                     int state)
 855 {
 856         int res;
 857
 858         down_read(&snd_pcm_link_rwsem);
 859         if (snd_pcm_stream_linked(substream))
 860                 res = snd_pcm_action_group(ops, substream, state, 0);
 861         else
 862                 res = snd_pcm_action_single(ops, substream, state);
 863         up_read(&snd_pcm_link_rwsem);
 864         return res;
 865 }
 866
 867 /*
 868  * start callbacks
 869  */
 870 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
 871 {
 872         struct snd_pcm_runtime *runtime = substream->runtime;
 873         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
 874                 return -EBADFD;
 875         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 876             !snd_pcm_playback_data(substream))
 877                 return -EPIPE;
 878         runtime->trigger_master = substream;
 879         return 0;
 880 }
 881
 882 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
 883 {
 884         if (substream->runtime->trigger_master != substream)
 885                 return 0;
 886         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
 887 }
 888
 889 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
 890 {
 891         if (substream->runtime->trigger_master == substream)
 892                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 893 }
 894
 895 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
 896 {
 897         struct snd_pcm_runtime *runtime = substream->runtime;
 898         snd_pcm_trigger_tstamp(substream);
 899         runtime->hw_ptr_jiffies = jiffies;
 900         runtime->status->state = state;
 901         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 902             runtime->silence_size > 0)
 903                 snd_pcm_playback_silence(substream, ULONG_MAX);
 904         if (substream->timer)
 905                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
 906                                  &runtime->trigger_tstamp);
 907 }
 908
 909 static struct action_ops snd_pcm_action_start = {
 910         .pre_action = snd_pcm_pre_start,
 911         .do_action = snd_pcm_do_start,
 912         .undo_action = snd_pcm_undo_start,
 913         .post_action = snd_pcm_post_start
 914 };
 915
 916 /**
 917  * snd_pcm_start - start all linked streams
 918  * @substream: the PCM substream instance
 919  */
 920 int snd_pcm_start(struct snd_pcm_substream *substream)
 921 {
 922         return snd_pcm_action(&snd_pcm_action_start, substream,
 923                               SNDRV_PCM_STATE_RUNNING);
 924 }
 925
 926 /*
 927  * stop callbacks
 928  */
 929 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
 930 {
 931         struct snd_pcm_runtime *runtime = substream->runtime;
 932         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
 933                 return -EBADFD;
 934         runtime->trigger_master = substream;
 935         return 0;
 936 }
 937
 938 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
 939 {
 940         if (substream->runtime->trigger_master == substream &&
 941             snd_pcm_running(substream))
 942                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
 943         return 0; /* unconditonally stop all substreams */
 944 }
 945
 946 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
 947 {
 948         struct snd_pcm_runtime *runtime = substream->runtime;
 949         if (runtime->status->state != state) {
 950                 snd_pcm_trigger_tstamp(substream);
 951                 if (substream->timer)
 952                         snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
 953                                          &runtime->trigger_tstamp);
 954                 runtime->status->state = state;
 955         }
 956         wake_up(&runtime->sleep);
 957         wake_up(&runtime->tsleep);
 958 }
 959
 960 static struct action_ops snd_pcm_action_stop = {
 961         .pre_action = snd_pcm_pre_stop,
 962         .do_action = snd_pcm_do_stop,
 963         .post_action = snd_pcm_post_stop
 964 };
 965
 966 /**
 967  * snd_pcm_stop - try to stop all running streams in the substream group
 968  * @substream: the PCM substream instance
 969  * @state: PCM state after stopping the stream
 970  *
 971  * The state of each stream is then changed to the given state unconditionally.
 972  */
 973 int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
 974 {
 975         return snd_pcm_action(&snd_pcm_action_stop, substream, state);
 976 }
 977
 978 EXPORT_SYMBOL(snd_pcm_stop);
 979
 980 /**
 981  * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 982  * @substream: the PCM substream
 983  *
 984  * After stopping, the state is changed to SETUP.
 985  * Unlike snd_pcm_stop(), this affects only the given stream.
 986  */
 987 int snd_pcm_drain_done(struct snd_pcm_substream *substream)
 988 {
 989         return snd_pcm_action_single(&snd_pcm_action_stop, substream,
 990                                      SNDRV_PCM_STATE_SETUP);
 991 }
 992
 993 /*
 994  * pause callbacks
 995  */
 996 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
 997 {
 998         struct snd_pcm_runtime *runtime = substream->runtime;
 999         if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
1000                 return -ENOSYS;
1001         if (push) {
1002                 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
1003                         return -EBADFD;
1004         } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
1005                 return -EBADFD;
1006         runtime->trigger_master = substream;
1007         return 0;
1008 }
1009
1010 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
1011 {
1012         if (substream->runtime->trigger_master != substream)
1013                 return 0;
1014         /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
1015          * a delta betwen the current jiffies, this gives a large enough
1016          * delta, effectively to skip the check once.
1017          */
1018         substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
1019         return substream->ops->trigger(substream,
1020                                        push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
1021                                               SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
1022 }
1023
1024 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
1025 {
1026         if (substream->runtime->trigger_master == substream)
1027                 substream->ops->trigger(substream,
1028                                         push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
1029                                         SNDRV_PCM_TRIGGER_PAUSE_PUSH);
1030 }
1031
1032 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
1033 {
1034         struct snd_pcm_runtime *runtime = substream->runtime;
1035         snd_pcm_trigger_tstamp(substream);
1036         if (push) {
1037                 runtime->status->state = SNDRV_PCM_STATE_PAUSED;
1038                 if (substream->timer)
1039                         snd_timer_notify(substream->timer,
1040                                          SNDRV_TIMER_EVENT_MPAUSE,
1041                                          &runtime->trigger_tstamp);
1042                 wake_up(&runtime->sleep);
1043                 wake_up(&runtime->tsleep);
1044         } else {
1045                 runtime->status->state = SNDRV_PCM_STATE_RUNNING;
1046                 if (substream->timer)
1047                         snd_timer_notify(substream->timer,
1048                                          SNDRV_TIMER_EVENT_MCONTINUE,
1049                                          &runtime->trigger_tstamp);
1050         }
1051 }
1052
1053 static struct action_ops snd_pcm_action_pause = {
1054         .pre_action = snd_pcm_pre_pause,
1055         .do_action = snd_pcm_do_pause,
1056         .undo_action = snd_pcm_undo_pause,
1057         .post_action = snd_pcm_post_pause
1058 };
1059
1060 /*
1061  * Push/release the pause for all linked streams.
1062  */
1063 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
1064 {
1065         return snd_pcm_action(&snd_pcm_action_pause, substream, push);
1066 }
1067
1068 #ifdef CONFIG_PM
1069 /* suspend */
1070
1071 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
1072 {
1073         struct snd_pcm_runtime *runtime = substream->runtime;
1074         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1075                 return -EBUSY;
1076         runtime->trigger_master = substream;
1077         return 0;
1078 }
1079
1080 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
1081 {
1082         struct snd_pcm_runtime *runtime = substream->runtime;
1083         if (runtime->trigger_master != substream)
1084                 return 0;
1085         if (! snd_pcm_running(substream))
1086                 return 0;
1087         substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1088         return 0; /* suspend unconditionally */
1089 }
1090
1091 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
1092 {
1093         struct snd_pcm_runtime *runtime = substream->runtime;
1094         snd_pcm_trigger_tstamp(substream);
1095         if (substream->timer)
1096                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
1097                                  &runtime->trigger_tstamp);
1098         runtime->status->suspended_state = runtime->status->state;
1099         runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
1100         wake_up(&runtime->sleep);
1101         wake_up(&runtime->tsleep);
1102 }
1103
1104 static struct action_ops snd_pcm_action_suspend = {
1105         .pre_action = snd_pcm_pre_suspend,
1106         .do_action = snd_pcm_do_suspend,
1107         .post_action = snd_pcm_post_suspend
1108 };
1109
1110 /**
1111  * snd_pcm_suspend - trigger SUSPEND to all linked streams
1112  * @substream: the PCM substream
1113  *
1114  * After this call, all streams are changed to SUSPENDED state.
1115  */
1116 int snd_pcm_suspend(struct snd_pcm_substream *substream)
1117 {
1118         int err;
1119         unsigned long flags;
1120
1121         if (! substream)
1122                 return 0;
1123
1124         snd_pcm_stream_lock_irqsave(substream, flags);
1125         err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
1126         snd_pcm_stream_unlock_irqrestore(substream, flags);
1127         return err;
1128 }
1129
1130 EXPORT_SYMBOL(snd_pcm_suspend);
1131
1132 /**
1133  * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
1134  * @pcm: the PCM instance
1135  *
1136  * After this call, all streams are changed to SUSPENDED state.
1137  */
1138 int snd_pcm_suspend_all(struct snd_pcm *pcm)
1139 {
1140         struct snd_pcm_substream *substream;
1141         int stream, err = 0;
1142
1143         if (! pcm)
1144                 return 0;
1145
1146         for (stream = 0; stream < 2; stream++) {
1147                 for (substream = pcm->streams[stream].substream;
1148                      substream; substream = substream->next) {
1149                         /* FIXME: the open/close code should lock this as well */
1150                         if (substream->runtime == NULL)
1151                                 continue;
1152                         err = snd_pcm_suspend(substream);
1153                         if (err < 0 && err != -EBUSY)
1154                                 return err;
1155                 }
1156         }
1157         return 0;
1158 }
1159
1160 EXPORT_SYMBOL(snd_pcm_suspend_all);
1161
1162 /* resume */
1163
1164 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
1165 {
1166         struct snd_pcm_runtime *runtime = substream->runtime;
1167         if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
1168                 return -ENOSYS;
1169         runtime->trigger_master = substream;
1170         return 0;
1171 }
1172
1173 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
1174 {
1175         struct snd_pcm_runtime *runtime = substream->runtime;
1176         if (runtime->trigger_master != substream)
1177                 return 0;
1178         /* DMA not running previously? */
1179         if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
1180             (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
1181              substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
1182                 return 0;
1183         return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
1184 }
1185
1186 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
1187 {
1188         if (substream->runtime->trigger_master == substream &&
1189             snd_pcm_running(substream))
1190                 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
1191 }
1192
1193 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
1194 {
1195         struct snd_pcm_runtime *runtime = substream->runtime;
1196         snd_pcm_trigger_tstamp(substream);
1197         if (substream->timer)
1198                 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
1199                                  &runtime->trigger_tstamp);
1200         runtime->status->state = runtime->status->suspended_state;
1201 }
1202
1203 static struct action_ops snd_pcm_action_resume = {
1204         .pre_action = snd_pcm_pre_resume,
1205         .do_action = snd_pcm_do_resume,
1206         .undo_action = snd_pcm_undo_resume,
1207         .post_action = snd_pcm_post_resume
1208 };
1209
1210 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1211 {
1212         struct snd_card *card = substream->pcm->card;
1213         int res;
1214
1215         snd_power_lock(card);
1216         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1217                 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
1218         snd_power_unlock(card);
1219         return res;
1220 }
1221
1222 #else
1223
1224 static int snd_pcm_resume(struct snd_pcm_substream *substream)
1225 {
1226         return -ENOSYS;
1227 }
1228
1229 #endif /* CONFIG_PM */
1230
1231 /*
1232  * xrun ioctl
1233  *
1234  * Change the RUNNING stream(s) to XRUN state.
1235  */
1236 static int snd_pcm_xrun(struct snd_pcm_substream *substream)
1237 {
1238         struct snd_card *card = substream->pcm->card;
1239         struct snd_pcm_runtime *runtime = substream->runtime;
1240         int result;
1241
1242         snd_power_lock(card);
1243         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1244                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1245                 if (result < 0)
1246                         goto _unlock;
1247         }
1248
1249         snd_pcm_stream_lock_irq(substream);
1250         switch (runtime->status->state) {
1251         case SNDRV_PCM_STATE_XRUN:
1252                 result = 0;     /* already there */
1253                 break;
1254         case SNDRV_PCM_STATE_RUNNING:
1255                 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
1256                 break;
1257         default:
1258                 result = -EBADFD;
1259         }
1260         snd_pcm_stream_unlock_irq(substream);
1261  _unlock:
1262         snd_power_unlock(card);
1263         return result;
1264 }
1265
1266 /*
1267  * reset ioctl
1268  */
1269 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
1270 {
1271         struct snd_pcm_runtime *runtime = substream->runtime;
1272         switch (runtime->status->state) {
1273         case SNDRV_PCM_STATE_RUNNING:
1274         case SNDRV_PCM_STATE_PREPARED:
1275         case SNDRV_PCM_STATE_PAUSED:
1276         case SNDRV_PCM_STATE_SUSPENDED:
1277                 return 0;
1278         default:
1279                 return -EBADFD;
1280         }
1281 }
1282
1283 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
1284 {
1285         struct snd_pcm_runtime *runtime = substream->runtime;
1286         int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
1287         if (err < 0)
1288                 return err;
1289         runtime->hw_ptr_base = 0;
1290         runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
1291                 runtime->status->hw_ptr % runtime->period_size;
1292         runtime->silence_start = runtime->status->hw_ptr;
1293         runtime->silence_filled = 0;
1294         return 0;
1295 }
1296
1297 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
1298 {
1299         struct snd_pcm_runtime *runtime = substream->runtime;
1300         runtime->control->appl_ptr = runtime->status->hw_ptr;
1301         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
1302             runtime->silence_size > 0)
1303                 snd_pcm_playback_silence(substream, ULONG_MAX);
1304 }
1305
1306 static struct action_ops snd_pcm_action_reset = {
1307         .pre_action = snd_pcm_pre_reset,
1308         .do_action = snd_pcm_do_reset,
1309         .post_action = snd_pcm_post_reset
1310 };
1311
1312 static int snd_pcm_reset(struct snd_pcm_substream *substream)
1313 {
1314         return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
1315 }
1316
1317 /*
1318  * prepare ioctl
1319  */
1320 /* we use the second argument for updating f_flags */
1321 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
1322                                int f_flags)
1323 {
1324         struct snd_pcm_runtime *runtime = substream->runtime;
1325         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1326             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
1327                 return -EBADFD;
1328         if (snd_pcm_running(substream))
1329                 return -EBUSY;
1330         substream->f_flags = f_flags;
1331         return 0;
1332 }
1333
1334 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
1335 {
1336         int err;
1337         err = substream->ops->prepare(substream);
1338         if (err < 0)
1339                 return err;
1340         return snd_pcm_do_reset(substream, 0);
1341 }
1342
1343 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
1344 {
1345         struct snd_pcm_runtime *runtime = substream->runtime;
1346         runtime->control->appl_ptr = runtime->status->hw_ptr;
1347         runtime->status->state = SNDRV_PCM_STATE_PREPARED;
1348 }
1349
1350 static struct action_ops snd_pcm_action_prepare = {
1351         .pre_action = snd_pcm_pre_prepare,
1352         .do_action = snd_pcm_do_prepare,
1353         .post_action = snd_pcm_post_prepare
1354 };
1355
1356 /**
1357  * snd_pcm_prepare - prepare the PCM substream to be triggerable
1358  * @substream: the PCM substream instance
1359  * @file: file to refer f_flags
1360  */
1361 static int snd_pcm_prepare(struct snd_pcm_substream *substream,
1362                            struct file *file)
1363 {
1364         int res;
1365         struct snd_card *card = substream->pcm->card;
1366         int f_flags;
1367
1368         if (file)
1369                 f_flags = file->f_flags;
1370         else
1371                 f_flags = substream->f_flags;
1372
1373         snd_power_lock(card);
1374         if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
1375                 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
1376                                                substream, f_flags);
1377         snd_power_unlock(card);
1378         return res;
1379 }
1380
1381 /*
1382  * drain ioctl
1383  */
1384
1385 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
1386 {
1387         substream->runtime->trigger_master = substream;
1388         return 0;
1389 }
1390
1391 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
1392 {
1393         struct snd_pcm_runtime *runtime = substream->runtime;
1394         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1395                 switch (runtime->status->state) {
1396                 case SNDRV_PCM_STATE_PREPARED:
1397                         /* start playback stream if possible */
1398                         if (! snd_pcm_playback_empty(substream)) {
1399                                 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
1400                                 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
1401                         }
1402                         break;
1403                 case SNDRV_PCM_STATE_RUNNING:
1404                         runtime->status->state = SNDRV_PCM_STATE_DRAINING;
1405                         break;
1406                 default:
1407                         break;
1408                 }
1409         } else {
1410                 /* stop running stream */
1411                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
1412                         int new_state = snd_pcm_capture_avail(runtime) > 0 ?
1413                                 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
1414                         snd_pcm_do_stop(substream, new_state);
1415                         snd_pcm_post_stop(substream, new_state);
1416                 }
1417         }
1418         return 0;
1419 }
1420
1421 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
1422 {
1423 }
1424
1425 static struct action_ops snd_pcm_action_drain_init = {
1426         .pre_action = snd_pcm_pre_drain_init,
1427         .do_action = snd_pcm_do_drain_init,
1428         .post_action = snd_pcm_post_drain_init
1429 };
1430
1431 static int snd_pcm_drop(struct snd_pcm_substream *substream);
1432
1433 /*
1434  * Drain the stream(s).
1435  * When the substream is linked, sync until the draining of all playback streams
1436  * is finished.
1437  * After this call, all streams are supposed to be either SETUP or DRAINING
1438  * (capture only) state.
1439  */
1440 static int snd_pcm_drain(struct snd_pcm_substream *substream,
1441                          struct file *file)
1442 {
1443         struct snd_card *card;
1444         struct snd_pcm_runtime *runtime;
1445         struct snd_pcm_substream *s;
1446         wait_queue_t wait;
1447         int result = 0;
1448         int nonblock = 0;
1449
1450         card = substream->pcm->card;
1451         runtime = substream->runtime;
1452
1453         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1454                 return -EBADFD;
1455
1456         snd_power_lock(card);
1457         if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
1458                 result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
1459                 if (result < 0) {
1460                         snd_power_unlock(card);
1461                         return result;
1462                 }
1463         }
1464
1465         if (file) {
1466                 if (file->f_flags & O_NONBLOCK)
1467                         nonblock = 1;
1468         } else if (substream->f_flags & O_NONBLOCK)
1469                 nonblock = 1;
1470
1471         down_read(&snd_pcm_link_rwsem);
1472         snd_pcm_stream_lock_irq(substream);
1473         /* resume pause */
1474         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1475                 snd_pcm_pause(substream, 0);
1476
1477         /* pre-start/stop - all running streams are changed to DRAINING state */
1478         result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
1479         if (result < 0)
1480                 goto unlock;
1481         /* in non-blocking, we don't wait in ioctl but let caller poll */
1482         if (nonblock) {
1483                 result = -EAGAIN;
1484                 goto unlock;
1485         }
1486
1487         for (;;) {
1488                 long tout;
1489                 struct snd_pcm_runtime *to_check;
1490                 if (signal_pending(current)) {
1491                         result = -ERESTARTSYS;
1492                         break;
1493                 }
1494                 /* find a substream to drain */
1495                 to_check = NULL;
1496                 snd_pcm_group_for_each_entry(s, substream) {
1497                         if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
1498                                 continue;
1499                         runtime = s->runtime;
1500                         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1501                                 to_check = runtime;
1502                                 break;
1503                         }
1504                 }
1505                 if (!to_check)
1506                         break; /* all drained */
1507                 init_waitqueue_entry(&wait, current);
1508                 add_wait_queue(&to_check->sleep, &wait);
1509                 set_current_state(TASK_INTERRUPTIBLE);
1510                 snd_pcm_stream_unlock_irq(substream);
1511                 up_read(&snd_pcm_link_rwsem);
1512                 snd_power_unlock(card);
1513                 tout = schedule_timeout(10 * HZ);
1514                 snd_power_lock(card);
1515                 down_read(&snd_pcm_link_rwsem);
1516                 snd_pcm_stream_lock_irq(substream);
1517                 remove_wait_queue(&to_check->sleep, &wait);
1518                 if (tout == 0) {
1519                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1520                                 result = -ESTRPIPE;
1521                         else {
1522                                 snd_printd("playback drain error (DMA or IRQ trouble?)\n");
1523                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1524                                 result = -EIO;
1525                         }
1526                         break;
1527                 }
1528         }
1529
1530  unlock:
1531         snd_pcm_stream_unlock_irq(substream);
1532         up_read(&snd_pcm_link_rwsem);
1533         snd_power_unlock(card);
1534
1535         return result;
1536 }
1537
1538 /*
1539  * drop ioctl
1540  *
1541  * Immediately put all linked substreams into SETUP state.
1542  */
1543 static int snd_pcm_drop(struct snd_pcm_substream *substream)
1544 {
1545         struct snd_pcm_runtime *runtime;
1546         struct snd_card *card;
1547         int result = 0;
1548
1549         if (PCM_RUNTIME_CHECK(substream))
1550                 return -ENXIO;
1551         runtime = substream->runtime;
1552         card = substream->pcm->card;
1553
1554         if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1555             runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
1556             runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
1557                 return -EBADFD;
1558
1559         snd_pcm_stream_lock_irq(substream);
1560         /* resume pause */
1561         if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
1562                 snd_pcm_pause(substream, 0);
1563
1564         snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1565         /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
1566         snd_pcm_stream_unlock_irq(substream);
1567
1568         return result;
1569 }
1570
1571
1572 /* WARNING: Don't forget to fput back the file */
1573 static struct file *snd_pcm_file_fd(int fd)
1574 {
1575         struct file *file;
1576         struct inode *inode;
1577         unsigned int minor;
1578
1579         file = fget(fd);
1580         if (!file)
1581                 return NULL;
1582         inode = file->f_path.dentry->d_inode;
1583         if (!S_ISCHR(inode->i_mode) ||
1584             imajor(inode) != snd_major) {
1585                 fput(file);
1586                 return NULL;
1587         }
1588         minor = iminor(inode);
1589         if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
1590             !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
1591                 fput(file);
1592                 return NULL;
1593         }
1594         return file;
1595 }
1596
1597 /*
1598  * PCM link handling
1599  */
1600 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
1601 {
1602         int res = 0;
1603         struct file *file;
1604         struct snd_pcm_file *pcm_file;
1605         struct snd_pcm_substream *substream1;
1606
1607         file = snd_pcm_file_fd(fd);
1608         if (!file)
1609                 return -EBADFD;
1610         pcm_file = file->private_data;
1611         substream1 = pcm_file->substream;
1612         down_write(&snd_pcm_link_rwsem);
1613         write_lock_irq(&snd_pcm_link_rwlock);
1614         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
1615             substream->runtime->status->state != substream1->runtime->status->state) {
1616                 res = -EBADFD;
1617                 goto _end;
1618         }
1619         if (snd_pcm_stream_linked(substream1)) {
1620                 res = -EALREADY;
1621                 goto _end;
1622         }
1623         if (!snd_pcm_stream_linked(substream)) {
1624                 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
1625                 if (substream->group == NULL) {
1626                         res = -ENOMEM;
1627                         goto _end;
1628                 }
1629                 spin_lock_init(&substream->group->lock);
1630                 INIT_LIST_HEAD(&substream->group->substreams);
1631                 list_add_tail(&substream->link_list, &substream->group->substreams);
1632                 substream->group->count = 1;
1633         }
1634         list_add_tail(&substream1->link_list, &substream->group->substreams);
1635         substream->group->count++;
1636         substream1->group = substream->group;
1637  _end:
1638         write_unlock_irq(&snd_pcm_link_rwlock);
1639         up_write(&snd_pcm_link_rwsem);
1640         fput(file);
1641         return res;
1642 }
1643
1644 static void relink_to_local(struct snd_pcm_substream *substream)
1645 {
1646         substream->group = &substream->self_group;
1647         INIT_LIST_HEAD(&substream->self_group.substreams);
1648         list_add_tail(&substream->link_list, &substream->self_group.substreams);
1649 }
1650
1651 static int snd_pcm_unlink(struct snd_pcm_substream *substream)
1652 {
1653         struct snd_pcm_substream *s;
1654         int res = 0;
1655
1656         down_write(&snd_pcm_link_rwsem);
1657         write_lock_irq(&snd_pcm_link_rwlock);
1658         if (!snd_pcm_stream_linked(substream)) {
1659                 res = -EALREADY;
1660                 goto _end;
1661         }
1662         list_del(&substream->link_list);
1663         substream->group->count--;
1664         if (substream->group->count == 1) {     /* detach the last stream, too */
1665                 snd_pcm_group_for_each_entry(s, substream) {
1666                         relink_to_local(s);
1667                         break;
1668                 }
1669                 kfree(substream->group);
1670         }
1671         relink_to_local(substream);
1672        _end:
1673         write_unlock_irq(&snd_pcm_link_rwlock);
1674         up_write(&snd_pcm_link_rwsem);
1675         return res;
1676 }
1677
1678 /*
1679  * hw configurator
1680  */
1681 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
1682                                struct snd_pcm_hw_rule *rule)
1683 {
1684         struct snd_interval t;
1685         snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
1686                      hw_param_interval_c(params, rule->deps[1]), &t);
1687         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1688 }
1689
1690 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
1691                                struct snd_pcm_hw_rule *rule)
1692 {
1693         struct snd_interval t;
1694         snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
1695                      hw_param_interval_c(params, rule->deps[1]), &t);
1696         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1697 }
1698
1699 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
1700                                    struct snd_pcm_hw_rule *rule)
1701 {
1702         struct snd_interval t;
1703         snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
1704                          hw_param_interval_c(params, rule->deps[1]),
1705                          (unsigned long) rule->private, &t);
1706         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1707 }
1708
1709 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
1710                                    struct snd_pcm_hw_rule *rule)
1711 {
1712         struct snd_interval t;
1713         snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
1714                          (unsigned long) rule->private,
1715                          hw_param_interval_c(params, rule->deps[1]), &t);
1716         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1717 }
1718
1719 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
1720                                   struct snd_pcm_hw_rule *rule)
1721 {
1722         unsigned int k;
1723         struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
1724         struct snd_mask m;
1725         struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
1726         snd_mask_any(&m);
1727         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1728                 int bits;
1729                 if (! snd_mask_test(mask, k))
1730                         continue;
1731                 bits = snd_pcm_format_physical_width(k);
1732                 if (bits <= 0)
1733                         continue; /* ignore invalid formats */
1734                 if ((unsigned)bits < i->min || (unsigned)bits > i->max)
1735                         snd_mask_reset(&m, k);
1736         }
1737         return snd_mask_refine(mask, &m);
1738 }
1739
1740 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
1741                                        struct snd_pcm_hw_rule *rule)
1742 {
1743         struct snd_interval t;
1744         unsigned int k;
1745         t.min = UINT_MAX;
1746         t.max = 0;
1747         t.openmin = 0;
1748         t.openmax = 0;
1749         for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
1750                 int bits;
1751                 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
1752                         continue;
1753                 bits = snd_pcm_format_physical_width(k);
1754                 if (bits <= 0)
1755                         continue; /* ignore invalid formats */
1756                 if (t.min > (unsigned)bits)
1757                         t.min = bits;
1758                 if (t.max < (unsigned)bits)
1759                         t.max = bits;
1760         }
1761         t.integer = 1;
1762         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1763 }
1764
1765 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
1766 #error "Change this table"
1767 #endif
1768
1769 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
1770                                  48000, 64000, 88200, 96000, 176400, 192000 };
1771
1772 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
1773         .count = ARRAY_SIZE(rates),
1774         .list = rates,
1775 };
1776
1777 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
1778                                 struct snd_pcm_hw_rule *rule)
1779 {
1780         struct snd_pcm_hardware *hw = rule->private;
1781         return snd_interval_list(hw_param_interval(params, rule->var),
1782                                  snd_pcm_known_rates.count,
1783                                  snd_pcm_known_rates.list, hw->rates);
1784 }
1785
1786 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
1787                                             struct snd_pcm_hw_rule *rule)
1788 {
1789         struct snd_interval t;
1790         struct snd_pcm_substream *substream = rule->private;
1791         t.min = 0;
1792         t.max = substream->buffer_bytes_max;
1793         t.openmin = 0;
1794         t.openmax = 0;
1795         t.integer = 1;
1796         return snd_interval_refine(hw_param_interval(params, rule->var), &t);
1797 }
1798
1799 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
1800 {
1801         struct snd_pcm_runtime *runtime = substream->runtime;
1802         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1803         int k, err;
1804
1805         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
1806                 snd_mask_any(constrs_mask(constrs, k));
1807         }
1808
1809         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
1810                 snd_interval_any(constrs_interval(constrs, k));
1811         }
1812
1813         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
1814         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
1815         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
1816         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
1817         snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
1818
1819         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
1820                                    snd_pcm_hw_rule_format, NULL,
1821                                    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1822         if (err < 0)
1823                 return err;
1824         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1825                                   snd_pcm_hw_rule_sample_bits, NULL,
1826                                   SNDRV_PCM_HW_PARAM_FORMAT,
1827                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1828         if (err < 0)
1829                 return err;
1830         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
1831                                   snd_pcm_hw_rule_div, NULL,
1832                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1833         if (err < 0)
1834                 return err;
1835         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1836                                   snd_pcm_hw_rule_mul, NULL,
1837                                   SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
1838         if (err < 0)
1839                 return err;
1840         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1841                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1842                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1843         if (err < 0)
1844                 return err;
1845         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
1846                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1847                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
1848         if (err < 0)
1849                 return err;
1850         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
1851                                   snd_pcm_hw_rule_div, NULL,
1852                                   SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1853         if (err < 0)
1854                 return err;
1855         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1856                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1857                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
1858         if (err < 0)
1859                 return err;
1860         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1861                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1862                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
1863         if (err < 0)
1864                 return err;
1865         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
1866                                   snd_pcm_hw_rule_div, NULL,
1867                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
1868         if (err < 0)
1869                 return err;
1870         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1871                                   snd_pcm_hw_rule_div, NULL,
1872                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1873         if (err < 0)
1874                 return err;
1875         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1876                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1877                                   SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1878         if (err < 0)
1879                 return err;
1880         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
1881                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1882                                   SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1883         if (err < 0)
1884                 return err;
1885         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1886                                   snd_pcm_hw_rule_mul, NULL,
1887                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
1888         if (err < 0)
1889                 return err;
1890         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1891                                   snd_pcm_hw_rule_mulkdiv, (void*) 8,
1892                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1893         if (err < 0)
1894                 return err;
1895         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1896                                   snd_pcm_hw_rule_muldivk, (void*) 1000000,
1897                                   SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
1898         if (err < 0)
1899                 return err;
1900         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1901                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1902                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1903         if (err < 0)
1904                 return err;
1905         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1906                                   snd_pcm_hw_rule_muldivk, (void*) 8,
1907                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
1908         if (err < 0)
1909                 return err;
1910         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1911                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1912                                   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1913         if (err < 0)
1914                 return err;
1915         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
1916                                   snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
1917                                   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
1918         if (err < 0)
1919                 return err;
1920         return 0;
1921 }
1922
1923 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
1924 {
1925         struct snd_pcm_runtime *runtime = substream->runtime;
1926         struct snd_pcm_hardware *hw = &runtime->hw;
1927         int err;
1928         unsigned int mask = 0;
1929
1930         if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1931                 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
1932         if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1933                 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
1934         if (hw->info & SNDRV_PCM_INFO_MMAP) {
1935                 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
1936                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
1937                 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
1938                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
1939                 if (hw->info & SNDRV_PCM_INFO_COMPLEX)
1940                         mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
1941         }
1942         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
1943         if (err < 0)
1944                 return err;
1945
1946         err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
1947         if (err < 0)
1948                 return err;
1949
1950         err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
1951         if (err < 0)
1952                 return err;
1953
1954         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
1955                                            hw->channels_min, hw->channels_max);
1956         if (err < 0)
1957                 return err;
1958
1959         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
1960                                            hw->rate_min, hw->rate_max);
1961         if (err < 0)
1962                 return err;
1963
1964         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
1965                                            hw->period_bytes_min, hw->period_bytes_max);
1966         if (err < 0)
1967                 return err;
1968
1969         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
1970                                            hw->periods_min, hw->periods_max);
1971         if (err < 0)
1972                 return err;
1973
1974         err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1975                                            hw->period_bytes_min, hw->buffer_bytes_max);
1976         if (err < 0)
1977                 return err;
1978
1979         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
1980                                   snd_pcm_hw_rule_buffer_bytes_max, substream,
1981                                   SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
1982         if (err < 0)
1983                 return err;
1984
1985         /* FIXME: remove */
1986         if (runtime->dma_bytes) {
1987                 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
1988                 if (err < 0)
1989                         return -EINVAL;
1990         }
1991
1992         if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
1993                 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
1994                                           snd_pcm_hw_rule_rate, hw,
1995                                           SNDRV_PCM_HW_PARAM_RATE, -1);
1996                 if (err < 0)
1997                         return err;
1998         }
1999
2000         /* FIXME: this belong to lowlevel */
2001         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
2002
2003         return 0;
2004 }
2005
2006 static void pcm_release_private(struct snd_pcm_substream *substream)
2007 {
2008         snd_pcm_unlink(substream);
2009 }
2010
2011 void snd_pcm_release_substream(struct snd_pcm_substream *substream)
2012 {
2013         substream->ref_count--;
2014         if (substream->ref_count > 0)
2015                 return;
2016
2017         snd_pcm_drop(substream);
2018         if (substream->hw_opened) {
2019                 if (substream->ops->hw_free != NULL)
2020                         substream->ops->hw_free(substream);
2021                 substream->ops->close(substream);
2022                 substream->hw_opened = 0;
2023         }
2024         if (substream->pcm_release) {
2025                 substream->pcm_release(substream);
2026                 substream->pcm_release = NULL;
2027         }
2028         snd_pcm_detach_substream(substream);
2029 }
2030
2031 EXPORT_SYMBOL(snd_pcm_release_substream);
2032
2033 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
2034                            struct file *file,
2035                            struct snd_pcm_substream **rsubstream)
2036 {
2037         struct snd_pcm_substream *substream;
2038         int err;
2039
2040         err = snd_pcm_attach_substream(pcm, stream, file, &substream);
2041         if (err < 0)
2042                 return err;
2043         if (substream->ref_count > 1) {
2044                 *rsubstream = substream;
2045                 return 0;
2046         }
2047
2048         err = snd_pcm_hw_constraints_init(substream);
2049         if (err < 0) {
2050                 snd_printd("snd_pcm_hw_constraints_init failed\n");
2051                 goto error;
2052         }
2053
2054         if ((err = substream->ops->open(substream)) < 0)
2055                 goto error;
2056
2057         substream->hw_opened = 1;
2058
2059         err = snd_pcm_hw_constraints_complete(substream);
2060         if (err < 0) {
2061                 snd_printd("snd_pcm_hw_constraints_complete failed\n");
2062                 goto error;
2063         }
2064
2065         *rsubstream = substream;
2066         return 0;
2067
2068  error:
2069         snd_pcm_release_substream(substream);
2070         return err;
2071 }
2072
2073 EXPORT_SYMBOL(snd_pcm_open_substream);
2074
2075 static int snd_pcm_open_file(struct file *file,
2076                              struct snd_pcm *pcm,
2077                              int stream,
2078                              struct snd_pcm_file **rpcm_file)
2079 {
2080         struct snd_pcm_file *pcm_file;
2081         struct snd_pcm_substream *substream;
2082         struct snd_pcm_str *str;
2083         int err;
2084
2085         if (rpcm_file)
2086                 *rpcm_file = NULL;
2087
2088         err = snd_pcm_open_substream(pcm, stream, file, &substream);
2089         if (err < 0)
2090                 return err;
2091
2092         pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
2093         if (pcm_file == NULL) {
2094                 snd_pcm_release_substream(substream);
2095                 return -ENOMEM;
2096         }
2097         pcm_file->substream = substream;
2098         if (substream->ref_count == 1) {
2099                 str = substream->pstr;
2100                 substream->file = pcm_file;
2101                 substream->pcm_release = pcm_release_private;
2102         }
2103         file->private_data = pcm_file;
2104         if (rpcm_file)
2105                 *rpcm_file = pcm_file;
2106         return 0;
2107 }
2108
2109 static int snd_pcm_playback_open(struct inode *inode, struct file *file)
2110 {
2111         struct snd_pcm *pcm;
2112
2113         pcm = snd_lookup_minor_data(iminor(inode),
2114                                     SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
2115         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
2116 }
2117
2118 static int snd_pcm_capture_open(struct inode *inode, struct file *file)
2119 {
2120         struct snd_pcm *pcm;
2121
2122         pcm = snd_lookup_minor_data(iminor(inode),
2123                                     SNDRV_DEVICE_TYPE_PCM_CAPTURE);
2124         return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
2125 }
2126
2127 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
2128 {
2129         int err;
2130         struct snd_pcm_file *pcm_file;
2131         wait_queue_t wait;
2132
2133         if (pcm == NULL) {
2134                 err = -ENODEV;
2135                 goto __error1;
2136         }
2137         err = snd_card_file_add(pcm->card, file);
2138         if (err < 0)
2139                 goto __error1;
2140         if (!try_module_get(pcm->card->module)) {
2141                 err = -EFAULT;
2142                 goto __error2;
2143         }
2144         init_waitqueue_entry(&wait, current);
2145         add_wait_queue(&pcm->open_wait, &wait);
2146         mutex_lock(&pcm->open_mutex);
2147         while (1) {
2148                 err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
2149                 if (err >= 0)
2150                         break;
2151                 if (err == -EAGAIN) {
2152                         if (file->f_flags & O_NONBLOCK) {
2153                                 err = -EBUSY;
2154                                 break;
2155                         }
2156                 } else
2157                         break;
2158                 set_current_state(TASK_INTERRUPTIBLE);
2159                 mutex_unlock(&pcm->open_mutex);
2160                 schedule();
2161                 mutex_lock(&pcm->open_mutex);
2162                 if (signal_pending(current)) {
2163                         err = -ERESTARTSYS;
2164                         break;
2165                 }
2166         }
2167         remove_wait_queue(&pcm->open_wait, &wait);
2168         mutex_unlock(&pcm->open_mutex);
2169         if (err < 0)
2170                 goto __error;
2171         return err;
2172
2173       __error:
2174         module_put(pcm->card->module);
2175       __error2:
2176         snd_card_file_remove(pcm->card, file);
2177       __error1:
2178         return err;
2179 }
2180
2181 static int snd_pcm_release(struct inode *inode, struct file *file)
2182 {
2183         struct snd_pcm *pcm;
2184         struct snd_pcm_substream *substream;
2185         struct snd_pcm_file *pcm_file;
2186
2187         pcm_file = file->private_data;
2188         substream = pcm_file->substream;
2189         if (snd_BUG_ON(!substream))
2190                 return -ENXIO;
2191         pcm = substream->pcm;
2192         mutex_lock(&pcm->open_mutex);
2193         snd_pcm_release_substream(substream);
2194         kfree(pcm_file);
2195         mutex_unlock(&pcm->open_mutex);
2196         wake_up(&pcm->open_wait);
2197         module_put(pcm->card->module);
2198         snd_card_file_remove(pcm->card, file);
2199         return 0;
2200 }
2201
2202 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
2203                                                  snd_pcm_uframes_t frames)
2204 {
2205         struct snd_pcm_runtime *runtime = substream->runtime;
2206         snd_pcm_sframes_t appl_ptr;
2207         snd_pcm_sframes_t ret;
2208         snd_pcm_sframes_t hw_avail;
2209
2210         if (frames == 0)
2211                 return 0;
2212
2213         snd_pcm_stream_lock_irq(substream);
2214         switch (runtime->status->state) {
2215         case SNDRV_PCM_STATE_PREPARED:
2216                 break;
2217         case SNDRV_PCM_STATE_DRAINING:
2218         case SNDRV_PCM_STATE_RUNNING:
2219                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2220                         break;
2221                 /* Fall through */
2222         case SNDRV_PCM_STATE_XRUN:
2223                 ret = -EPIPE;
2224                 goto __end;
2225         case SNDRV_PCM_STATE_SUSPENDED:
2226                 ret = -ESTRPIPE;
2227                 goto __end;
2228         default:
2229                 ret = -EBADFD;
2230                 goto __end;
2231         }
2232
2233         hw_avail = snd_pcm_playback_hw_avail(runtime);
2234         if (hw_avail <= 0) {
2235                 ret = 0;
2236                 goto __end;
2237         }
2238         if (frames > (snd_pcm_uframes_t)hw_avail)
2239                 frames = hw_avail;
2240         appl_ptr = runtime->control->appl_ptr - frames;
2241         if (appl_ptr < 0)
2242                 appl_ptr += runtime->boundary;
2243         runtime->control->appl_ptr = appl_ptr;
2244         ret = frames;
2245  __end:
2246         snd_pcm_stream_unlock_irq(substream);
2247         return ret;
2248 }
2249
2250 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
2251                                                 snd_pcm_uframes_t frames)
2252 {
2253         struct snd_pcm_runtime *runtime = substream->runtime;
2254         snd_pcm_sframes_t appl_ptr;
2255         snd_pcm_sframes_t ret;
2256         snd_pcm_sframes_t hw_avail;
2257
2258         if (frames == 0)
2259                 return 0;
2260
2261         snd_pcm_stream_lock_irq(substream);
2262         switch (runtime->status->state) {
2263         case SNDRV_PCM_STATE_PREPARED:
2264         case SNDRV_PCM_STATE_DRAINING:
2265                 break;
2266         case SNDRV_PCM_STATE_RUNNING:
2267                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2268                         break;
2269                 /* Fall through */
2270         case SNDRV_PCM_STATE_XRUN:
2271                 ret = -EPIPE;
2272                 goto __end;
2273         case SNDRV_PCM_STATE_SUSPENDED:
2274                 ret = -ESTRPIPE;
2275                 goto __end;
2276         default:
2277                 ret = -EBADFD;
2278                 goto __end;
2279         }
2280
2281         hw_avail = snd_pcm_capture_hw_avail(runtime);
2282         if (hw_avail <= 0) {
2283                 ret = 0;
2284                 goto __end;
2285         }
2286         if (frames > (snd_pcm_uframes_t)hw_avail)
2287                 frames = hw_avail;
2288         appl_ptr = runtime->control->appl_ptr - frames;
2289         if (appl_ptr < 0)
2290                 appl_ptr += runtime->boundary;
2291         runtime->control->appl_ptr = appl_ptr;
2292         ret = frames;
2293  __end:
2294         snd_pcm_stream_unlock_irq(substream);
2295         return ret;
2296 }
2297
2298 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
2299                                                   snd_pcm_uframes_t frames)
2300 {
2301         struct snd_pcm_runtime *runtime = substream->runtime;
2302         snd_pcm_sframes_t appl_ptr;
2303         snd_pcm_sframes_t ret;
2304         snd_pcm_sframes_t avail;
2305
2306         if (frames == 0)
2307                 return 0;
2308
2309         snd_pcm_stream_lock_irq(substream);
2310         switch (runtime->status->state) {
2311         case SNDRV_PCM_STATE_PREPARED:
2312         case SNDRV_PCM_STATE_PAUSED:
2313                 break;
2314         case SNDRV_PCM_STATE_DRAINING:
2315         case SNDRV_PCM_STATE_RUNNING:
2316                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2317                         break;
2318                 /* Fall through */
2319         case SNDRV_PCM_STATE_XRUN:
2320                 ret = -EPIPE;
2321                 goto __end;
2322         case SNDRV_PCM_STATE_SUSPENDED:
2323                 ret = -ESTRPIPE;
2324                 goto __end;
2325         default:
2326                 ret = -EBADFD;
2327                 goto __end;
2328         }
2329
2330         avail = snd_pcm_playback_avail(runtime);
2331         if (avail <= 0) {
2332                 ret = 0;
2333                 goto __end;
2334         }
2335         if (frames > (snd_pcm_uframes_t)avail)
2336                 frames = avail;
2337         appl_ptr = runtime->control->appl_ptr + frames;
2338         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2339                 appl_ptr -= runtime->boundary;
2340         runtime->control->appl_ptr = appl_ptr;
2341         ret = frames;
2342  __end:
2343         snd_pcm_stream_unlock_irq(substream);
2344         return ret;
2345 }
2346
2347 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
2348                                                  snd_pcm_uframes_t frames)
2349 {
2350         struct snd_pcm_runtime *runtime = substream->runtime;
2351         snd_pcm_sframes_t appl_ptr;
2352         snd_pcm_sframes_t ret;
2353         snd_pcm_sframes_t avail;
2354
2355         if (frames == 0)
2356                 return 0;
2357
2358         snd_pcm_stream_lock_irq(substream);
2359         switch (runtime->status->state) {
2360         case SNDRV_PCM_STATE_PREPARED:
2361         case SNDRV_PCM_STATE_DRAINING:
2362         case SNDRV_PCM_STATE_PAUSED:
2363                 break;
2364         case SNDRV_PCM_STATE_RUNNING:
2365                 if (snd_pcm_update_hw_ptr(substream) >= 0)
2366                         break;
2367                 /* Fall through */
2368         case SNDRV_PCM_STATE_XRUN:
2369                 ret = -EPIPE;
2370                 goto __end;
2371         case SNDRV_PCM_STATE_SUSPENDED:
2372                 ret = -ESTRPIPE;
2373                 goto __end;
2374         default:
2375                 ret = -EBADFD;
2376                 goto __end;
2377         }
2378
2379         avail = snd_pcm_capture_avail(runtime);
2380         if (avail <= 0) {
2381                 ret = 0;
2382                 goto __end;
2383         }
2384         if (frames > (snd_pcm_uframes_t)avail)
2385                 frames = avail;
2386         appl_ptr = runtime->control->appl_ptr + frames;
2387         if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
2388                 appl_ptr -= runtime->boundary;
2389         runtime->control->appl_ptr = appl_ptr;
2390         ret = frames;
2391  __end:
2392         snd_pcm_stream_unlock_irq(substream);
2393         return ret;
2394 }
2395
2396 static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
2397 {
2398         struct snd_pcm_runtime *runtime = substream->runtime;
2399         int err;
2400
2401         snd_pcm_stream_lock_irq(substream);
2402         switch (runtime->status->state) {
2403         case SNDRV_PCM_STATE_DRAINING:
2404                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2405                         goto __badfd;
2406         case SNDRV_PCM_STATE_RUNNING:
2407                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2408                         break;
2409                 /* Fall through */
2410         case SNDRV_PCM_STATE_PREPARED:
2411         case SNDRV_PCM_STATE_SUSPENDED:
2412                 err = 0;
2413                 break;
2414         case SNDRV_PCM_STATE_XRUN:
2415                 err = -EPIPE;
2416                 break;
2417         default:
2418               __badfd:
2419                 err = -EBADFD;
2420                 break;
2421         }
2422         snd_pcm_stream_unlock_irq(substream);
2423         return err;
2424 }
2425
2426 static int snd_pcm_delay(struct snd_pcm_substream *substream,
2427                          snd_pcm_sframes_t __user *res)
2428 {
2429         struct snd_pcm_runtime *runtime = substream->runtime;
2430         int err;
2431         snd_pcm_sframes_t n = 0;
2432
2433         snd_pcm_stream_lock_irq(substream);
2434         switch (runtime->status->state) {
2435         case SNDRV_PCM_STATE_DRAINING:
2436                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
2437                         goto __badfd;
2438         case SNDRV_PCM_STATE_RUNNING:
2439                 if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
2440                         break;
2441                 /* Fall through */
2442         case SNDRV_PCM_STATE_PREPARED:
2443         case SNDRV_PCM_STATE_SUSPENDED:
2444                 err = 0;
2445                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
2446                         n = snd_pcm_playback_hw_avail(runtime);
2447                 else
2448                         n = snd_pcm_capture_avail(runtime);
2449                 n += runtime->delay;
2450                 break;
2451         case SNDRV_PCM_STATE_XRUN:
2452                 err = -EPIPE;
2453                 break;
2454         default:
2455               __badfd:
2456                 err = -EBADFD;
2457                 break;
2458         }
2459         snd_pcm_stream_unlock_irq(substream);
2460         if (!err)
2461                 if (put_user(n, res))
2462                         err = -EFAULT;
2463         return err;
2464 }
2465
2466 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
2467                             struct snd_pcm_sync_ptr __user *_sync_ptr)
2468 {
2469         struct snd_pcm_runtime *runtime = substream->runtime;
2470         struct snd_pcm_sync_ptr sync_ptr;
2471         volatile struct snd_pcm_mmap_status *status;
2472         volatile struct snd_pcm_mmap_control *control;
2473         int err;
2474
2475         memset(&sync_ptr, 0, sizeof(sync_ptr));
2476         if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
2477                 return -EFAULT;
2478         if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
2479                 return -EFAULT;
2480         status = runtime->status;
2481         control = runtime->control;
2482         if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
2483                 err = snd_pcm_hwsync(substream);
2484                 if (err < 0)
2485                         return err;
2486         }
2487         snd_pcm_stream_lock_irq(substream);
2488         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
2489                 control->appl_ptr = sync_ptr.c.control.appl_ptr;
2490         else
2491                 sync_ptr.c.control.appl_ptr = control->appl_ptr;
2492         if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
2493                 control->avail_min = sync_ptr.c.control.avail_min;
2494         else
2495                 sync_ptr.c.control.avail_min = control->avail_min;
2496         sync_ptr.s.status.state = status->state;
2497         sync_ptr.s.status.hw_ptr = status->hw_ptr;
2498         sync_ptr.s.status.tstamp = status->tstamp;
2499         sync_ptr.s.status.suspended_state = status->suspended_state;
2500         snd_pcm_stream_unlock_irq(substream);
2501         if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
2502                 return -EFAULT;
2503         return 0;
2504 }
2505
2506 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
2507 {
2508         struct snd_pcm_runtime *runtime = substream->runtime;
2509         int arg;
2510
2511         if (get_user(arg, _arg))
2512                 return -EFAULT;
2513         if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
2514                 return -EINVAL;
2515         runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
2516         if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
2517                 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
2518         return 0;
2519 }
2520
2521 static int snd_pcm_common_ioctl1(struct file *file,
2522                                  struct snd_pcm_substream *substream,
2523                                  unsigned int cmd, void __user *arg)
2524 {
2525         switch (cmd) {
2526         case SNDRV_PCM_IOCTL_PVERSION:
2527                 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
2528         case SNDRV_PCM_IOCTL_INFO:
2529                 return snd_pcm_info_user(substream, arg);
2530         case SNDRV_PCM_IOCTL_TSTAMP:    /* just for compatibility */
2531                 return 0;
2532         case SNDRV_PCM_IOCTL_TTSTAMP:
2533                 return snd_pcm_tstamp(substream, arg);
2534         case SNDRV_PCM_IOCTL_HW_REFINE:
2535                 return snd_pcm_hw_refine_user(substream, arg);
2536         case SNDRV_PCM_IOCTL_HW_PARAMS:
2537                 return snd_pcm_hw_params_user(substream, arg);
2538         case SNDRV_PCM_IOCTL_HW_FREE:
2539                 return snd_pcm_hw_free(substream);
2540         case SNDRV_PCM_IOCTL_SW_PARAMS:
2541                 return snd_pcm_sw_params_user(substream, arg);
2542         case SNDRV_PCM_IOCTL_STATUS:
2543                 return snd_pcm_status_user(substream, arg);
2544         case SNDRV_PCM_IOCTL_CHANNEL_INFO:
2545                 return snd_pcm_channel_info_user(substream, arg);
2546         case SNDRV_PCM_IOCTL_PREPARE:
2547                 return snd_pcm_prepare(substream, file);
2548         case SNDRV_PCM_IOCTL_RESET:
2549                 return snd_pcm_reset(substream);
2550         case SNDRV_PCM_IOCTL_START:
2551                 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
2552         case SNDRV_PCM_IOCTL_LINK:
2553                 return snd_pcm_link(substream, (int)(unsigned long) arg);
2554         case SNDRV_PCM_IOCTL_UNLINK:
2555                 return snd_pcm_unlink(substream);
2556         case SNDRV_PCM_IOCTL_RESUME:
2557                 return snd_pcm_resume(substream);
2558         case SNDRV_PCM_IOCTL_XRUN:
2559                 return snd_pcm_xrun(substream);
2560         case SNDRV_PCM_IOCTL_HWSYNC:
2561                 return snd_pcm_hwsync(substream);
2562         case SNDRV_PCM_IOCTL_DELAY:
2563                 return snd_pcm_delay(substream, arg);
2564         case SNDRV_PCM_IOCTL_SYNC_PTR:
2565                 return snd_pcm_sync_ptr(substream, arg);
2566 #ifdef CONFIG_SND_SUPPORT_OLD_API
2567         case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
2568                 return snd_pcm_hw_refine_old_user(substream, arg);
2569         case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
2570                 return snd_pcm_hw_params_old_user(substream, arg);
2571 #endif
2572         case SNDRV_PCM_IOCTL_DRAIN:
2573                 return snd_pcm_drain(substream, file);
2574         case SNDRV_PCM_IOCTL_DROP:
2575                 return snd_pcm_drop(substream);
2576         case SNDRV_PCM_IOCTL_PAUSE:
2577         {
2578                 int res;
2579                 snd_pcm_stream_lock_irq(substream);
2580                 res = snd_pcm_pause(substream, (int)(unsigned long)arg);
2581                 snd_pcm_stream_unlock_irq(substream);
2582                 return res;
2583         }
2584         }
2585         snd_printd("unknown ioctl = 0x%x\n", cmd);
2586         return -ENOTTY;
2587 }
2588
2589 static int snd_pcm_playback_ioctl1(struct file *file,
2590                                    struct snd_pcm_substream *substream,
2591                                    unsigned int cmd, void __user *arg)
2592 {
2593         if (snd_BUG_ON(!substream))
2594                 return -ENXIO;
2595         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
2596                 return -EINVAL;
2597         switch (cmd) {
2598         case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
2599         {
2600                 struct snd_xferi xferi;
2601                 struct snd_xferi __user *_xferi = arg;
2602                 struct snd_pcm_runtime *runtime = substream->runtime;
2603                 snd_pcm_sframes_t result;
2604                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2605                         return -EBADFD;
2606                 if (put_user(0, &_xferi->result))
2607                         return -EFAULT;
2608                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2609                         return -EFAULT;
2610                 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
2611                 __put_user(result, &_xferi->result);
2612                 return result < 0 ? result : 0;
2613         }
2614         case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
2615         {
2616                 struct snd_xfern xfern;
2617                 struct snd_xfern __user *_xfern = arg;
2618                 struct snd_pcm_runtime *runtime = substream->runtime;
2619                 void __user **bufs;
2620                 snd_pcm_sframes_t result;
2621                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2622                         return -EBADFD;
2623                 if (runtime->channels > 128)
2624                         return -EINVAL;
2625                 if (put_user(0, &_xfern->result))
2626                         return -EFAULT;
2627                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2628                         return -EFAULT;
2629
2630                 bufs = memdup_user(xfern.bufs,
2631                                    sizeof(void *) * runtime->channels);
2632                 if (IS_ERR(bufs))
2633                         return PTR_ERR(bufs);
2634                 result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
2635                 kfree(bufs);
2636                 __put_user(result, &_xfern->result);
2637                 return result < 0 ? result : 0;
2638         }
2639         case SNDRV_PCM_IOCTL_REWIND:
2640         {
2641                 snd_pcm_uframes_t frames;
2642                 snd_pcm_uframes_t __user *_frames = arg;
2643                 snd_pcm_sframes_t result;
2644                 if (get_user(frames, _frames))
2645                         return -EFAULT;
2646                 if (put_user(0, _frames))
2647                         return -EFAULT;
2648                 result = snd_pcm_playback_rewind(substream, frames);
2649                 __put_user(result, _frames);
2650                 return result < 0 ? result : 0;
2651         }
2652         case SNDRV_PCM_IOCTL_FORWARD:
2653         {
2654                 snd_pcm_uframes_t frames;
2655                 snd_pcm_uframes_t __user *_frames = arg;
2656                 snd_pcm_sframes_t result;
2657                 if (get_user(frames, _frames))
2658                         return -EFAULT;
2659                 if (put_user(0, _frames))
2660                         return -EFAULT;
2661                 result = snd_pcm_playback_forward(substream, frames);
2662                 __put_user(result, _frames);
2663                 return result < 0 ? result : 0;
2664         }
2665         }
2666         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2667 }
2668
2669 static int snd_pcm_capture_ioctl1(struct file *file,
2670                                   struct snd_pcm_substream *substream,
2671                                   unsigned int cmd, void __user *arg)
2672 {
2673         if (snd_BUG_ON(!substream))
2674                 return -ENXIO;
2675         if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
2676                 return -EINVAL;
2677         switch (cmd) {
2678         case SNDRV_PCM_IOCTL_READI_FRAMES:
2679         {
2680                 struct snd_xferi xferi;
2681                 struct snd_xferi __user *_xferi = arg;
2682                 struct snd_pcm_runtime *runtime = substream->runtime;
2683                 snd_pcm_sframes_t result;
2684                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2685                         return -EBADFD;
2686                 if (put_user(0, &_xferi->result))
2687                         return -EFAULT;
2688                 if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
2689                         return -EFAULT;
2690                 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
2691                 __put_user(result, &_xferi->result);
2692                 return result < 0 ? result : 0;
2693         }
2694         case SNDRV_PCM_IOCTL_READN_FRAMES:
2695         {
2696                 struct snd_xfern xfern;
2697                 struct snd_xfern __user *_xfern = arg;
2698                 struct snd_pcm_runtime *runtime = substream->runtime;
2699                 void *bufs;
2700                 snd_pcm_sframes_t result;
2701                 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2702                         return -EBADFD;
2703                 if (runtime->channels > 128)
2704                         return -EINVAL;
2705                 if (put_user(0, &_xfern->result))
2706                         return -EFAULT;
2707                 if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
2708                         return -EFAULT;
2709
2710                 bufs = memdup_user(xfern.bufs,
2711                                    sizeof(void *) * runtime->channels);
2712                 if (IS_ERR(bufs))
2713                         return PTR_ERR(bufs);
2714                 result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
2715                 kfree(bufs);
2716                 __put_user(result, &_xfern->result);
2717                 return result < 0 ? result : 0;
2718         }
2719         case SNDRV_PCM_IOCTL_REWIND:
2720         {
2721                 snd_pcm_uframes_t frames;
2722                 snd_pcm_uframes_t __user *_frames = arg;
2723                 snd_pcm_sframes_t result;
2724                 if (get_user(frames, _frames))
2725                         return -EFAULT;
2726                 if (put_user(0, _frames))
2727                         return -EFAULT;
2728                 result = snd_pcm_capture_rewind(substream, frames);
2729                 __put_user(result, _frames);
2730                 return result < 0 ? result : 0;
2731         }
2732         case SNDRV_PCM_IOCTL_FORWARD:
2733         {
2734                 snd_pcm_uframes_t frames;
2735                 snd_pcm_uframes_t __user *_frames = arg;
2736                 snd_pcm_sframes_t result;
2737                 if (get_user(frames, _frames))
2738                         return -EFAULT;
2739                 if (put_user(0, _frames))
2740                         return -EFAULT;
2741                 result = snd_pcm_capture_forward(substream, frames);
2742                 __put_user(result, _frames);
2743                 return result < 0 ? result : 0;
2744         }
2745         }
2746         return snd_pcm_common_ioctl1(file, substream, cmd, arg);
2747 }
2748
2749 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
2750                                    unsigned long arg)
2751 {
2752         struct snd_pcm_file *pcm_file;
2753
2754         pcm_file = file->private_data;
2755
2756         if (((cmd >> 8) & 0xff) != 'A')
2757                 return -ENOTTY;
2758
2759         return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
2760                                        (void __user *)arg);
2761 }
2762
2763 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
2764                                   unsigned long arg)
2765 {
2766         struct snd_pcm_file *pcm_file;
2767
2768         pcm_file = file->private_data;
2769
2770         if (((cmd >> 8) & 0xff) != 'A')
2771                 return -ENOTTY;
2772
2773         return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
2774                                       (void __user *)arg);
2775 }
2776
2777 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
2778                          unsigned int cmd, void *arg)
2779 {
2780         mm_segment_t fs;
2781         int result;
2782
2783         fs = snd_enter_user();
2784         switch (substream->stream) {
2785         case SNDRV_PCM_STREAM_PLAYBACK:
2786                 result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
2787                                                  (void __user *)arg);
2788                 break;
2789         case SNDRV_PCM_STREAM_CAPTURE:
2790                 result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
2791                                                 (void __user *)arg);
2792                 break;
2793         default:
2794                 result = -EINVAL;
2795                 break;
2796         }
2797         snd_leave_user(fs);
2798         return result;
2799 }
2800
2801 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
2802
2803 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
2804                             loff_t * offset)
2805 {
2806         struct snd_pcm_file *pcm_file;
2807         struct snd_pcm_substream *substream;
2808         struct snd_pcm_runtime *runtime;
2809         snd_pcm_sframes_t result;
2810
2811         pcm_file = file->private_data;
2812         substream = pcm_file->substream;
2813         if (PCM_RUNTIME_CHECK(substream))
2814                 return -ENXIO;
2815         runtime = substream->runtime;
2816         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2817                 return -EBADFD;
2818         if (!frame_aligned(runtime, count))
2819                 return -EINVAL;
2820         count = bytes_to_frames(runtime, count);
2821         result = snd_pcm_lib_read(substream, buf, count);
2822         if (result > 0)
2823                 result = frames_to_bytes(runtime, result);
2824         return result;
2825 }
2826
2827 static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
2828                              size_t count, loff_t * offset)
2829 {
2830         struct snd_pcm_file *pcm_file;
2831         struct snd_pcm_substream *substream;
2832         struct snd_pcm_runtime *runtime;
2833         snd_pcm_sframes_t result;
2834
2835         pcm_file = file->private_data;
2836         substream = pcm_file->substream;
2837         if (PCM_RUNTIME_CHECK(substream))
2838                 return -ENXIO;
2839         runtime = substream->runtime;
2840         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2841                 return -EBADFD;
2842         if (!frame_aligned(runtime, count))
2843                 return -EINVAL;
2844         count = bytes_to_frames(runtime, count);
2845         result = snd_pcm_lib_write(substream, buf, count);
2846         if (result > 0)
2847                 result = frames_to_bytes(runtime, result);
2848         return result;
2849 }
2850
2851 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
2852                              unsigned long nr_segs, loff_t pos)
2853
2854 {
2855         struct snd_pcm_file *pcm_file;
2856         struct snd_pcm_substream *substream;
2857         struct snd_pcm_runtime *runtime;
2858         snd_pcm_sframes_t result;
2859         unsigned long i;
2860         void __user **bufs;
2861         snd_pcm_uframes_t frames;
2862
2863         pcm_file = iocb->ki_filp->private_data;
2864         substream = pcm_file->substream;
2865         if (PCM_RUNTIME_CHECK(substream))
2866                 return -ENXIO;
2867         runtime = substream->runtime;
2868         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2869                 return -EBADFD;
2870         if (nr_segs > 1024 || nr_segs != runtime->channels)
2871                 return -EINVAL;
2872         if (!frame_aligned(runtime, iov->iov_len))
2873                 return -EINVAL;
2874         frames = bytes_to_samples(runtime, iov->iov_len);
2875         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2876         if (bufs == NULL)
2877                 return -ENOMEM;
2878         for (i = 0; i < nr_segs; ++i)
2879                 bufs[i] = iov[i].iov_base;
2880         result = snd_pcm_lib_readv(substream, bufs, frames);
2881         if (result > 0)
2882                 result = frames_to_bytes(runtime, result);
2883         kfree(bufs);
2884         return result;
2885 }
2886
2887 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
2888                               unsigned long nr_segs, loff_t pos)
2889 {
2890         struct snd_pcm_file *pcm_file;
2891         struct snd_pcm_substream *substream;
2892         struct snd_pcm_runtime *runtime;
2893         snd_pcm_sframes_t result;
2894         unsigned long i;
2895         void __user **bufs;
2896         snd_pcm_uframes_t frames;
2897
2898         pcm_file = iocb->ki_filp->private_data;
2899         substream = pcm_file->substream;
2900         if (PCM_RUNTIME_CHECK(substream))
2901                 return -ENXIO;
2902         runtime = substream->runtime;
2903         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2904                 return -EBADFD;
2905         if (nr_segs > 128 || nr_segs != runtime->channels ||
2906             !frame_aligned(runtime, iov->iov_len))
2907                 return -EINVAL;
2908         frames = bytes_to_samples(runtime, iov->iov_len);
2909         bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
2910         if (bufs == NULL)
2911                 return -ENOMEM;
2912         for (i = 0; i < nr_segs; ++i)
2913                 bufs[i] = iov[i].iov_base;
2914         result = snd_pcm_lib_writev(substream, bufs, frames);
2915         if (result > 0)
2916                 result = frames_to_bytes(runtime, result);
2917         kfree(bufs);
2918         return result;
2919 }
2920
2921 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
2922 {
2923         struct snd_pcm_file *pcm_file;
2924         struct snd_pcm_substream *substream;
2925         struct snd_pcm_runtime *runtime;
2926         unsigned int mask;
2927         snd_pcm_uframes_t avail;
2928
2929         pcm_file = file->private_data;
2930
2931         substream = pcm_file->substream;
2932         if (PCM_RUNTIME_CHECK(substream))
2933                 return -ENXIO;
2934         runtime = substream->runtime;
2935
2936         poll_wait(file, &runtime->sleep, wait);
2937
2938         snd_pcm_stream_lock_irq(substream);
2939         avail = snd_pcm_playback_avail(runtime);
2940         switch (runtime->status->state) {
2941         case SNDRV_PCM_STATE_RUNNING:
2942         case SNDRV_PCM_STATE_PREPARED:
2943         case SNDRV_PCM_STATE_PAUSED:
2944                 if (avail >= runtime->control->avail_min) {
2945                         mask = POLLOUT | POLLWRNORM;
2946                         break;
2947                 }
2948                 /* Fall through */
2949         case SNDRV_PCM_STATE_DRAINING:
2950                 mask = 0;
2951                 break;
2952         default:
2953                 mask = POLLOUT | POLLWRNORM | POLLERR;
2954                 break;
2955         }
2956         snd_pcm_stream_unlock_irq(substream);
2957         return mask;
2958 }
2959
2960 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
2961 {
2962         struct snd_pcm_file *pcm_file;
2963         struct snd_pcm_substream *substream;
2964         struct snd_pcm_runtime *runtime;
2965         unsigned int mask;
2966         snd_pcm_uframes_t avail;
2967
2968         pcm_file = file->private_data;
2969
2970         substream = pcm_file->substream;
2971         if (PCM_RUNTIME_CHECK(substream))
2972                 return -ENXIO;
2973         runtime = substream->runtime;
2974
2975         poll_wait(file, &runtime->sleep, wait);
2976
2977         snd_pcm_stream_lock_irq(substream);
2978         avail = snd_pcm_capture_avail(runtime);
2979         switch (runtime->status->state) {
2980         case SNDRV_PCM_STATE_RUNNING:
2981         case SNDRV_PCM_STATE_PREPARED:
2982         case SNDRV_PCM_STATE_PAUSED:
2983                 if (avail >= runtime->control->avail_min) {
2984                         mask = POLLIN | POLLRDNORM;
2985                         break;
2986                 }
2987                 mask = 0;
2988                 break;
2989         case SNDRV_PCM_STATE_DRAINING:
2990                 if (avail > 0) {
2991                         mask = POLLIN | POLLRDNORM;
2992                         break;
2993                 }
2994                 /* Fall through */
2995         default:
2996                 mask = POLLIN | POLLRDNORM | POLLERR;
2997                 break;
2998         }
2999         snd_pcm_stream_unlock_irq(substream);
3000         return mask;
3001 }
3002
3003 /*
3004  * mmap support
3005  */
3006
3007 /*
3008  * Only on coherent architectures, we can mmap the status and the control records
3009  * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
3010  */
3011 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
3012 /*
3013  * mmap status record
3014  */
3015 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
3016                                                 struct vm_fault *vmf)
3017 {
3018         struct snd_pcm_substream *substream = area->vm_private_data;
3019         struct snd_pcm_runtime *runtime;
3020
3021         if (substream == NULL)
3022                 return VM_FAULT_SIGBUS;
3023         runtime = substream->runtime;
3024         vmf->page = virt_to_page(runtime->status);
3025         get_page(vmf->page);
3026         return 0;
3027 }
3028
3029 static const struct vm_operations_struct snd_pcm_vm_ops_status =
3030 {
3031         .fault =        snd_pcm_mmap_status_fault,
3032 };
3033
3034 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3035                                struct vm_area_struct *area)
3036 {
3037         struct snd_pcm_runtime *runtime;
3038         long size;
3039         if (!(area->vm_flags & VM_READ))
3040                 return -EINVAL;
3041         runtime = substream->runtime;
3042         size = area->vm_end - area->vm_start;
3043         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
3044                 return -EINVAL;
3045         area->vm_ops = &snd_pcm_vm_ops_status;
3046         area->vm_private_data = substream;
3047         area->vm_flags |= VM_RESERVED;
3048         return 0;
3049 }
3050
3051 /*
3052  * mmap control record
3053  */
3054 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
3055                                                 struct vm_fault *vmf)
3056 {
3057         struct snd_pcm_substream *substream = area->vm_private_data;
3058         struct snd_pcm_runtime *runtime;
3059
3060         if (substream == NULL)
3061                 return VM_FAULT_SIGBUS;
3062         runtime = substream->runtime;
3063         vmf->page = virt_to_page(runtime->control);
3064         get_page(vmf->page);
3065         return 0;
3066 }
3067
3068 static const struct vm_operations_struct snd_pcm_vm_ops_control =
3069 {
3070         .fault =        snd_pcm_mmap_control_fault,
3071 };
3072
3073 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3074                                 struct vm_area_struct *area)
3075 {
3076         struct snd_pcm_runtime *runtime;
3077         long size;
3078         if (!(area->vm_flags & VM_READ))
3079                 return -EINVAL;
3080         runtime = substream->runtime;
3081         size = area->vm_end - area->vm_start;
3082         if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
3083                 return -EINVAL;
3084         area->vm_ops = &snd_pcm_vm_ops_control;
3085         area->vm_private_data = substream;
3086         area->vm_flags |= VM_RESERVED;
3087         return 0;
3088 }
3089 #else /* ! coherent mmap */
3090 /*
3091  * don't support mmap for status and control records.
3092  */
3093 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
3094                                struct vm_area_struct *area)
3095 {
3096         return -ENXIO;
3097 }
3098 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
3099                                 struct vm_area_struct *area)
3100 {
3101         return -ENXIO;
3102 }
3103 #endif /* coherent mmap */
3104
3105 static inline struct page *
3106 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
3107 {
3108         void *vaddr = substream->runtime->dma_area + ofs;
3109 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
3110         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3111                 return virt_to_page(CAC_ADDR(vaddr));
3112 #endif
3113 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
3114         if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
3115                 dma_addr_t addr = substream->runtime->dma_addr + ofs;
3116                 addr -= get_dma_offset(substream->dma_buffer.dev.dev);
3117                 /* assume dma_handle set via pfn_to_phys() in
3118                  * mm/dma-noncoherent.c
3119                  */
3120                 return pfn_to_page(addr >> PAGE_SHIFT);
3121         }
3122 #endif
3123         return virt_to_page(vaddr);
3124 }
3125
3126 /*
3127  * fault callback for mmapping a RAM page
3128  */
3129 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
3130                                                 struct vm_fault *vmf)
3131 {
3132         struct snd_pcm_substream *substream = area->vm_private_data;
3133         struct snd_pcm_runtime *runtime;
3134         unsigned long offset;
3135         struct page * page;
3136         size_t dma_bytes;
3137
3138         if (substream == NULL)
3139                 return VM_FAULT_SIGBUS;
3140         runtime = substream->runtime;
3141         offset = vmf->pgoff << PAGE_SHIFT;
3142         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3143         if (offset > dma_bytes - PAGE_SIZE)
3144                 return VM_FAULT_SIGBUS;
3145         if (substream->ops->page)
3146                 page = substream->ops->page(substream, offset);
3147         else
3148                 page = snd_pcm_default_page_ops(substream, offset);
3149         if (!page)
3150                 return VM_FAULT_SIGBUS;
3151         get_page(page);
3152         vmf->page = page;
3153         return 0;
3154 }
3155
3156 static const struct vm_operations_struct snd_pcm_vm_ops_data = {
3157         .open =         snd_pcm_mmap_data_open,
3158         .close =        snd_pcm_mmap_data_close,
3159 };
3160
3161 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
3162         .open =         snd_pcm_mmap_data_open,
3163         .close =        snd_pcm_mmap_data_close,
3164         .fault =        snd_pcm_mmap_data_fault,
3165 };
3166
3167 #ifndef ARCH_HAS_DMA_MMAP_COHERENT
3168 /* This should be defined / handled globally! */
3169 #ifdef CONFIG_ARM
3170 #define ARCH_HAS_DMA_MMAP_COHERENT
3171 #endif
3172 #endif
3173
3174 /*
3175  * mmap the DMA buffer on RAM
3176  */
3177 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
3178                                 struct vm_area_struct *area)
3179 {
3180         area->vm_flags |= VM_RESERVED;
3181 #ifdef ARCH_HAS_DMA_MMAP_COHERENT
3182         if (!substream->ops->page &&
3183             substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
3184                 return dma_mmap_coherent(substream->dma_buffer.dev.dev,
3185                                          area,
3186                                          substream->runtime->dma_area,
3187                                          substream->runtime->dma_addr,
3188                                          area->vm_end - area->vm_start);
3189 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */
3190         /* mmap with fault handler */
3191         area->vm_ops = &snd_pcm_vm_ops_data_fault;
3192         return 0;
3193 }
3194
3195 /*
3196  * mmap the DMA buffer on I/O memory area
3197  */
3198 #if SNDRV_PCM_INFO_MMAP_IOMEM
3199 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
3200                            struct vm_area_struct *area)
3201 {
3202         long size;
3203         unsigned long offset;
3204
3205         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3206         area->vm_flags |= VM_IO;
3207         size = area->vm_end - area->vm_start;
3208         offset = area->vm_pgoff << PAGE_SHIFT;
3209         if (io_remap_pfn_range(area, area->vm_start,
3210                                 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
3211                                 size, area->vm_page_prot))
3212                 return -EAGAIN;
3213         return 0;
3214 }
3215
3216 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
3217 #endif /* SNDRV_PCM_INFO_MMAP */
3218
3219 /* mmap callback with pgprot_noncached */
3220 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
3221                                struct vm_area_struct *area)
3222 {
3223         area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
3224         return snd_pcm_default_mmap(substream, area);
3225 }
3226 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
3227
3228 /*
3229  * mmap DMA buffer
3230  */
3231 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
3232                       struct vm_area_struct *area)
3233 {
3234         struct snd_pcm_runtime *runtime;
3235         long size;
3236         unsigned long offset;
3237         size_t dma_bytes;
3238         int err;
3239
3240         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
3241                 if (!(area->vm_flags & (VM_WRITE|VM_READ)))
3242                         return -EINVAL;
3243         } else {
3244                 if (!(area->vm_flags & VM_READ))
3245                         return -EINVAL;
3246         }
3247         runtime = substream->runtime;
3248         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
3249                 return -EBADFD;
3250         if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
3251                 return -ENXIO;
3252         if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
3253             runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
3254                 return -EINVAL;
3255         size = area->vm_end - area->vm_start;
3256         offset = area->vm_pgoff << PAGE_SHIFT;
3257         dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
3258         if ((size_t)size > dma_bytes)
3259                 return -EINVAL;
3260         if (offset > dma_bytes - size)
3261                 return -EINVAL;
3262
3263         area->vm_ops = &snd_pcm_vm_ops_data;
3264         area->vm_private_data = substream;
3265         if (substream->ops->mmap)
3266                 err = substream->ops->mmap(substream, area);
3267         else
3268                 err = snd_pcm_default_mmap(substream, area);
3269         if (!err)
3270                 atomic_inc(&substream->mmap_count);
3271         return err;
3272 }
3273
3274 EXPORT_SYMBOL(snd_pcm_mmap_data);
3275
3276 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
3277 {
3278         struct snd_pcm_file * pcm_file;
3279         struct snd_pcm_substream *substream;
3280         unsigned long offset;
3281
3282         pcm_file = file->private_data;
3283         substream = pcm_file->substream;
3284         if (PCM_RUNTIME_CHECK(substream))
3285                 return -ENXIO;
3286
3287         offset = area->vm_pgoff << PAGE_SHIFT;
3288         switch (offset) {
3289         case SNDRV_PCM_MMAP_OFFSET_STATUS:
3290                 if (pcm_file->no_compat_mmap)
3291                         return -ENXIO;
3292                 return snd_pcm_mmap_status(substream, file, area);
3293         case SNDRV_PCM_MMAP_OFFSET_CONTROL:
3294                 if (pcm_file->no_compat_mmap)
3295                         return -ENXIO;
3296                 return snd_pcm_mmap_control(substream, file, area);
3297         default:
3298                 return snd_pcm_mmap_data(substream, file, area);
3299         }
3300         return 0;
3301 }
3302
3303 static int snd_pcm_fasync(int fd, struct file * file, int on)
3304 {
3305         struct snd_pcm_file * pcm_file;
3306         struct snd_pcm_substream *substream;
3307         struct snd_pcm_runtime *runtime;
3308         int err = -ENXIO;
3309
3310         lock_kernel();
3311         pcm_file = file->private_data;
3312         substream = pcm_file->substream;
3313         if (PCM_RUNTIME_CHECK(substream))
3314                 goto out;
3315         runtime = substream->runtime;
3316         err = fasync_helper(fd, file, on, &runtime->fasync);
3317 out:
3318         unlock_kernel();
3319         return err;
3320 }
3321
3322 /*
3323  * ioctl32 compat
3324  */
3325 #ifdef CONFIG_COMPAT
3326 #include "pcm_compat.c"
3327 #else
3328 #define snd_pcm_ioctl_compat    NULL
3329 #endif
3330
3331 /*
3332  *  To be removed helpers to keep binary compatibility
3333  */
3334
3335 #ifdef CONFIG_SND_SUPPORT_OLD_API
3336 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
3337 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
3338
3339 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
3340                                                struct snd_pcm_hw_params_old *oparams)
3341 {
3342         unsigned int i;
3343
3344         memset(params, 0, sizeof(*params));
3345         params->flags = oparams->flags;
3346         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3347                 params->masks[i].bits[0] = oparams->masks[i];
3348         memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
3349         params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
3350         params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
3351         params->info = oparams->info;
3352         params->msbits = oparams->msbits;
3353         params->rate_num = oparams->rate_num;
3354         params->rate_den = oparams->rate_den;
3355         params->fifo_size = oparams->fifo_size;
3356 }
3357
3358 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
3359                                              struct snd_pcm_hw_params *params)
3360 {
3361         unsigned int i;
3362
3363         memset(oparams, 0, sizeof(*oparams));
3364         oparams->flags = params->flags;
3365         for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
3366                 oparams->masks[i] = params->masks[i].bits[0];
3367         memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
3368         oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
3369         oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
3370         oparams->info = params->info;
3371         oparams->msbits = params->msbits;
3372         oparams->rate_num = params->rate_num;
3373         oparams->rate_den = params->rate_den;
3374         oparams->fifo_size = params->fifo_size;
3375 }
3376
3377 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
3378                                       struct snd_pcm_hw_params_old __user * _oparams)
3379 {
3380         struct snd_pcm_hw_params *params;
3381         struct snd_pcm_hw_params_old *oparams = NULL;
3382         int err;
3383
3384         params = kmalloc(sizeof(*params), GFP_KERNEL);
3385         if (!params)
3386                 return -ENOMEM;
3387
3388         oparams = memdup_user(_oparams, sizeof(*oparams));
3389         if (IS_ERR(oparams)) {
3390                 err = PTR_ERR(oparams);
3391                 goto out;
3392         }
3393         snd_pcm_hw_convert_from_old_params(params, oparams);
3394         err = snd_pcm_hw_refine(substream, params);
3395         snd_pcm_hw_convert_to_old_params(oparams, params);
3396         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3397                 if (!err)
3398                         err = -EFAULT;
3399         }
3400
3401         kfree(oparams);
3402 out:
3403         kfree(params);
3404         return err;
3405 }
3406
3407 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
3408                                       struct snd_pcm_hw_params_old __user * _oparams)
3409 {
3410         struct snd_pcm_hw_params *params;
3411         struct snd_pcm_hw_params_old *oparams = NULL;
3412         int err;
3413
3414         params = kmalloc(sizeof(*params), GFP_KERNEL);
3415         if (!params)
3416                 return -ENOMEM;
3417
3418         oparams = memdup_user(_oparams, sizeof(*oparams));
3419         if (IS_ERR(oparams)) {
3420                 err = PTR_ERR(oparams);
3421                 goto out;
3422         }
3423         snd_pcm_hw_convert_from_old_params(params, oparams);
3424         err = snd_pcm_hw_params(substream, params);
3425         snd_pcm_hw_convert_to_old_params(oparams, params);
3426         if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
3427                 if (!err)
3428                         err = -EFAULT;
3429         }
3430
3431         kfree(oparams);
3432 out:
3433         kfree(params);
3434         return err;
3435 }
3436 #endif /* CONFIG_SND_SUPPORT_OLD_API */
3437
3438 #ifndef CONFIG_MMU
3439 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr,
3440                                       unsigned long len, unsigned long pgoff,
3441                                       unsigned long flags)
3442 {
3443         return 0;
3444 }
3445 #else
3446 # define dummy_get_unmapped_area NULL
3447 #endif
3448
3449 /*
3450  *  Register section
3451  */
3452
3453 const struct file_operations snd_pcm_f_ops[2] = {
3454         {
3455                 .owner =                THIS_MODULE,
3456                 .write =                snd_pcm_write,
3457                 .aio_write =            snd_pcm_aio_write,
3458                 .open =                 snd_pcm_playback_open,
3459                 .release =              snd_pcm_release,
3460                 .poll =                 snd_pcm_playback_poll,
3461                 .unlocked_ioctl =       snd_pcm_playback_ioctl,
3462                 .compat_ioctl =         snd_pcm_ioctl_compat,
3463                 .mmap =                 snd_pcm_mmap,
3464                 .fasync =               snd_pcm_fasync,
3465                 .get_unmapped_area =    dummy_get_unmapped_area,
3466         },
3467         {
3468                 .owner =                THIS_MODULE,
3469                 .read =                 snd_pcm_read,
3470                 .aio_read =             snd_pcm_aio_read,
3471                 .open =                 snd_pcm_capture_open,
3472                 .release =              snd_pcm_release,
3473                 .poll =                 snd_pcm_capture_poll,
3474                 .unlocked_ioctl =       snd_pcm_capture_ioctl,
3475                 .compat_ioctl =         snd_pcm_ioctl_compat,
3476                 .mmap =                 snd_pcm_mmap,
3477                 .fasync =               snd_pcm_fasync,
3478                 .get_unmapped_area =    dummy_get_unmapped_area,
3479         }
3480 };