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