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pcm_native.c

/*
 *  Digital Audio (PCM) abstract layer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/mm.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/pm_qos_params.h>
#include <linux/uio.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/timer.h>
#include <sound/minors.h>
#include <asm/io.h>
#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
#include <dma-coherence.h>
#endif

/*
 *  Compatibility
 */

00045 struct snd_pcm_hw_params_old {
      unsigned int flags;
      unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
                     SNDRV_PCM_HW_PARAM_ACCESS + 1];
      struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
                              SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
      unsigned int rmask;
      unsigned int cmask;
      unsigned int info;
      unsigned int msbits;
      unsigned int rate_num;
      unsigned int rate_den;
      snd_pcm_uframes_t fifo_size;
      unsigned char reserved[64];
};

#ifdef CONFIG_SND_SUPPORT_OLD_API
#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)

static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
                              struct snd_pcm_hw_params_old __user * _oparams);
static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
                              struct snd_pcm_hw_params_old __user * _oparams);
#endif
static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);

/*
 *
 */

DEFINE_RWLOCK(snd_pcm_link_rwlock);
EXPORT_SYMBOL(snd_pcm_link_rwlock);

static DECLARE_RWSEM(snd_pcm_link_rwsem);

static inline mm_segment_t snd_enter_user(void)
{
      mm_segment_t fs = get_fs();
      set_fs(get_ds());
      return fs;
}

static inline void snd_leave_user(mm_segment_t fs)
{
      set_fs(fs);
}



int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
{
      struct snd_pcm_runtime *runtime;
      struct snd_pcm *pcm = substream->pcm;
      struct snd_pcm_str *pstr = substream->pstr;

      memset(info, 0, sizeof(*info));
      info->card = pcm->card->number;
      info->device = pcm->device;
      info->stream = substream->stream;
      info->subdevice = substream->number;
      strlcpy(info->id, pcm->id, sizeof(info->id));
      strlcpy(info->name, pcm->name, sizeof(info->name));
      info->dev_class = pcm->dev_class;
      info->dev_subclass = pcm->dev_subclass;
      info->subdevices_count = pstr->substream_count;
      info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
      strlcpy(info->subname, substream->name, sizeof(info->subname));
      runtime = substream->runtime;
      /* AB: FIXME!!! This is definitely nonsense */
      if (runtime) {
            info->sync = runtime->sync;
            substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
      }
      return 0;
}

int snd_pcm_info_user(struct snd_pcm_substream *substream,
                  struct snd_pcm_info __user * _info)
{
      struct snd_pcm_info *info;
      int err;

      info = kmalloc(sizeof(*info), GFP_KERNEL);
      if (! info)
            return -ENOMEM;
      err = snd_pcm_info(substream, info);
      if (err >= 0) {
            if (copy_to_user(_info, info, sizeof(*info)))
                  err = -EFAULT;
      }
      kfree(info);
      return err;
}

#undef RULES_DEBUG

#ifdef RULES_DEBUG
#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
static const char * const snd_pcm_hw_param_names[] = {
      HW_PARAM(ACCESS),
      HW_PARAM(FORMAT),
      HW_PARAM(SUBFORMAT),
      HW_PARAM(SAMPLE_BITS),
      HW_PARAM(FRAME_BITS),
      HW_PARAM(CHANNELS),
      HW_PARAM(RATE),
      HW_PARAM(PERIOD_TIME),
      HW_PARAM(PERIOD_SIZE),
      HW_PARAM(PERIOD_BYTES),
      HW_PARAM(PERIODS),
      HW_PARAM(BUFFER_TIME),
      HW_PARAM(BUFFER_SIZE),
      HW_PARAM(BUFFER_BYTES),
      HW_PARAM(TICK_TIME),
};
#endif

int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 
                  struct snd_pcm_hw_params *params)
{
      unsigned int k;
      struct snd_pcm_hardware *hw;
      struct snd_interval *i = NULL;
      struct snd_mask *m = NULL;
      struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
      unsigned int rstamps[constrs->rules_num];
      unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
      unsigned int stamp = 2;
      int changed, again;

      params->info = 0;
      params->fifo_size = 0;
      if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
            params->msbits = 0;
      if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
            params->rate_num = 0;
            params->rate_den = 0;
      }

      for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
            m = hw_param_mask(params, k);
            if (snd_mask_empty(m))
                  return -EINVAL;
            if (!(params->rmask & (1 << k)))
                  continue;
#ifdef RULES_DEBUG
            printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
            printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
#endif
            changed = snd_mask_refine(m, constrs_mask(constrs, k));
#ifdef RULES_DEBUG
            printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
#endif
            if (changed)
                  params->cmask |= 1 << k;
            if (changed < 0)
                  return changed;
      }

      for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
            i = hw_param_interval(params, k);
            if (snd_interval_empty(i))
                  return -EINVAL;
            if (!(params->rmask & (1 << k)))
                  continue;
#ifdef RULES_DEBUG
            printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
            if (i->empty)
                  printk("empty");
            else
                  printk("%c%u %u%c", 
                         i->openmin ? '(' : '[', i->min,
                         i->max, i->openmax ? ')' : ']');
            printk(" -> ");
#endif
            changed = snd_interval_refine(i, constrs_interval(constrs, k));
#ifdef RULES_DEBUG
            if (i->empty)
                  printk("empty\n");
            else 
                  printk("%c%u %u%c\n", 
                         i->openmin ? '(' : '[', i->min,
                         i->max, i->openmax ? ')' : ']');
#endif
            if (changed)
                  params->cmask |= 1 << k;
            if (changed < 0)
                  return changed;
      }

      for (k = 0; k < constrs->rules_num; k++)
            rstamps[k] = 0;
      for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 
            vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
      do {
            again = 0;
            for (k = 0; k < constrs->rules_num; k++) {
                  struct snd_pcm_hw_rule *r = &constrs->rules[k];
                  unsigned int d;
                  int doit = 0;
                  if (r->cond && !(r->cond & params->flags))
                        continue;
                  for (d = 0; r->deps[d] >= 0; d++) {
                        if (vstamps[r->deps[d]] > rstamps[k]) {
                              doit = 1;
                              break;
                        }
                  }
                  if (!doit)
                        continue;
#ifdef RULES_DEBUG
                  printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
                  if (r->var >= 0) {
                        printk("%s = ", snd_pcm_hw_param_names[r->var]);
                        if (hw_is_mask(r->var)) {
                              m = hw_param_mask(params, r->var);
                              printk("%x", *m->bits);
                        } else {
                              i = hw_param_interval(params, r->var);
                              if (i->empty)
                                    printk("empty");
                              else
                                    printk("%c%u %u%c", 
                                           i->openmin ? '(' : '[', i->min,
                                           i->max, i->openmax ? ')' : ']');
                        }
                  }
#endif
                  changed = r->func(params, r);
#ifdef RULES_DEBUG
                  if (r->var >= 0) {
                        printk(" -> ");
                        if (hw_is_mask(r->var))
                              printk("%x", *m->bits);
                        else {
                              if (i->empty)
                                    printk("empty");
                              else
                                    printk("%c%u %u%c", 
                                           i->openmin ? '(' : '[', i->min,
                                           i->max, i->openmax ? ')' : ']');
                        }
                  }
                  printk("\n");
#endif
                  rstamps[k] = stamp;
                  if (changed && r->var >= 0) {
                        params->cmask |= (1 << r->var);
                        vstamps[r->var] = stamp;
                        again = 1;
                  }
                  if (changed < 0)
                        return changed;
                  stamp++;
            }
      } while (again);
      if (!params->msbits) {
            i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
            if (snd_interval_single(i))
                  params->msbits = snd_interval_value(i);
      }

      if (!params->rate_den) {
            i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
            if (snd_interval_single(i)) {
                  params->rate_num = snd_interval_value(i);
                  params->rate_den = 1;
            }
      }

      hw = &substream->runtime->hw;
      if (!params->info)
            params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
      if (!params->fifo_size) {
            m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
            i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
            if (snd_mask_min(m) == snd_mask_max(m) &&
                    snd_interval_min(i) == snd_interval_max(i)) {
                  changed = substream->ops->ioctl(substream,
                              SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
                  if (changed < 0)
                        return changed;
            }
      }
      params->rmask = 0;
      return 0;
}

EXPORT_SYMBOL(snd_pcm_hw_refine);

static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params __user * _params)
{
      struct snd_pcm_hw_params *params;
      int err;

      params = memdup_user(_params, sizeof(*params));
      if (IS_ERR(params))
            return PTR_ERR(params);

      err = snd_pcm_hw_refine(substream, params);
      if (copy_to_user(_params, params, sizeof(*params))) {
            if (!err)
                  err = -EFAULT;
      }

      kfree(params);
      return err;
}

static int period_to_usecs(struct snd_pcm_runtime *runtime)
{
      int usecs;

      if (! runtime->rate)
            return -1; /* invalid */

      /* take 75% of period time as the deadline */
      usecs = (750000 / runtime->rate) * runtime->period_size;
      usecs += ((750000 % runtime->rate) * runtime->period_size) /
            runtime->rate;

      return usecs;
}

static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
                       struct snd_pcm_hw_params *params)
{
      struct snd_pcm_runtime *runtime;
      int err, usecs;
      unsigned int bits;
      snd_pcm_uframes_t frames;

      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_OPEN:
      case SNDRV_PCM_STATE_SETUP:
      case SNDRV_PCM_STATE_PREPARED:
            break;
      default:
            snd_pcm_stream_unlock_irq(substream);
            return -EBADFD;
      }
      snd_pcm_stream_unlock_irq(substream);
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
      if (!substream->oss.oss)
#endif
            if (atomic_read(&substream->mmap_count))
                  return -EBADFD;

      params->rmask = ~0U;
      err = snd_pcm_hw_refine(substream, params);
      if (err < 0)
            goto _error;

      err = snd_pcm_hw_params_choose(substream, params);
      if (err < 0)
            goto _error;

      if (substream->ops->hw_params != NULL) {
            err = substream->ops->hw_params(substream, params);
            if (err < 0)
                  goto _error;
      }

      runtime->access = params_access(params);
      runtime->format = params_format(params);
      runtime->subformat = params_subformat(params);
      runtime->channels = params_channels(params);
      runtime->rate = params_rate(params);
      runtime->period_size = params_period_size(params);
      runtime->periods = params_periods(params);
      runtime->buffer_size = params_buffer_size(params);
      runtime->info = params->info;
      runtime->rate_num = params->rate_num;
      runtime->rate_den = params->rate_den;
      runtime->no_period_wakeup =
                  (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) &&
                  (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP);

      bits = snd_pcm_format_physical_width(runtime->format);
      runtime->sample_bits = bits;
      bits *= runtime->channels;
      runtime->frame_bits = bits;
      frames = 1;
      while (bits % 8 != 0) {
            bits *= 2;
            frames *= 2;
      }
      runtime->byte_align = bits / 8;
      runtime->min_align = frames;

      /* Default sw params */
      runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
      runtime->period_step = 1;
      runtime->control->avail_min = runtime->period_size;
      runtime->start_threshold = 1;
      runtime->stop_threshold = runtime->buffer_size;
      runtime->silence_threshold = 0;
      runtime->silence_size = 0;
      runtime->boundary = runtime->buffer_size;
      while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
            runtime->boundary *= 2;

      snd_pcm_timer_resolution_change(substream);
      runtime->status->state = SNDRV_PCM_STATE_SETUP;

      if (pm_qos_request_active(&substream->latency_pm_qos_req))
            pm_qos_remove_request(&substream->latency_pm_qos_req);
      if ((usecs = period_to_usecs(runtime)) >= 0)
            pm_qos_add_request(&substream->latency_pm_qos_req,
                           PM_QOS_CPU_DMA_LATENCY, usecs);
      return 0;
 _error:
      /* hardware might be unuseable from this time,
         so we force application to retry to set
         the correct hardware parameter settings */
      runtime->status->state = SNDRV_PCM_STATE_OPEN;
      if (substream->ops->hw_free != NULL)
            substream->ops->hw_free(substream);
      return err;
}

static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params __user * _params)
{
      struct snd_pcm_hw_params *params;
      int err;

      params = memdup_user(_params, sizeof(*params));
      if (IS_ERR(params))
            return PTR_ERR(params);

      err = snd_pcm_hw_params(substream, params);
      if (copy_to_user(_params, params, sizeof(*params))) {
            if (!err)
                  err = -EFAULT;
      }

      kfree(params);
      return err;
}

static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime;
      int result = 0;

      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_SETUP:
      case SNDRV_PCM_STATE_PREPARED:
            break;
      default:
            snd_pcm_stream_unlock_irq(substream);
            return -EBADFD;
      }
      snd_pcm_stream_unlock_irq(substream);
      if (atomic_read(&substream->mmap_count))
            return -EBADFD;
      if (substream->ops->hw_free)
            result = substream->ops->hw_free(substream);
      runtime->status->state = SNDRV_PCM_STATE_OPEN;
      pm_qos_remove_request(&substream->latency_pm_qos_req);
      return result;
}

static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
                       struct snd_pcm_sw_params *params)
{
      struct snd_pcm_runtime *runtime;
      int err;

      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      snd_pcm_stream_lock_irq(substream);
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
            snd_pcm_stream_unlock_irq(substream);
            return -EBADFD;
      }
      snd_pcm_stream_unlock_irq(substream);

      if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
            return -EINVAL;
      if (params->avail_min == 0)
            return -EINVAL;
      if (params->silence_size >= runtime->boundary) {
            if (params->silence_threshold != 0)
                  return -EINVAL;
      } else {
            if (params->silence_size > params->silence_threshold)
                  return -EINVAL;
            if (params->silence_threshold > runtime->buffer_size)
                  return -EINVAL;
      }
      err = 0;
      snd_pcm_stream_lock_irq(substream);
      runtime->tstamp_mode = params->tstamp_mode;
      runtime->period_step = params->period_step;
      runtime->control->avail_min = params->avail_min;
      runtime->start_threshold = params->start_threshold;
      runtime->stop_threshold = params->stop_threshold;
      runtime->silence_threshold = params->silence_threshold;
      runtime->silence_size = params->silence_size;
        params->boundary = runtime->boundary;
      if (snd_pcm_running(substream)) {
            if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
                runtime->silence_size > 0)
                  snd_pcm_playback_silence(substream, ULONG_MAX);
            err = snd_pcm_update_state(substream, runtime);
      }
      snd_pcm_stream_unlock_irq(substream);
      return err;
}

static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
                          struct snd_pcm_sw_params __user * _params)
{
      struct snd_pcm_sw_params params;
      int err;
      if (copy_from_user(&params, _params, sizeof(params)))
            return -EFAULT;
      err = snd_pcm_sw_params(substream, &params);
      if (copy_to_user(_params, &params, sizeof(params)))
            return -EFAULT;
      return err;
}

int snd_pcm_status(struct snd_pcm_substream *substream,
               struct snd_pcm_status *status)
{
      struct snd_pcm_runtime *runtime = substream->runtime;

      snd_pcm_stream_lock_irq(substream);
      status->state = runtime->status->state;
      status->suspended_state = runtime->status->suspended_state;
      if (status->state == SNDRV_PCM_STATE_OPEN)
            goto _end;
      status->trigger_tstamp = runtime->trigger_tstamp;
      if (snd_pcm_running(substream)) {
            snd_pcm_update_hw_ptr(substream);
            if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
                  status->tstamp = runtime->status->tstamp;
                  goto _tstamp_end;
            }
      }
      snd_pcm_gettime(runtime, &status->tstamp);
 _tstamp_end:
      status->appl_ptr = runtime->control->appl_ptr;
      status->hw_ptr = runtime->status->hw_ptr;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            status->avail = snd_pcm_playback_avail(runtime);
            if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
                runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
                  status->delay = runtime->buffer_size - status->avail;
                  status->delay += runtime->delay;
            } else
                  status->delay = 0;
      } else {
            status->avail = snd_pcm_capture_avail(runtime);
            if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
                  status->delay = status->avail + runtime->delay;
            else
                  status->delay = 0;
      }
      status->avail_max = runtime->avail_max;
      status->overrange = runtime->overrange;
      runtime->avail_max = 0;
      runtime->overrange = 0;
 _end:
      snd_pcm_stream_unlock_irq(substream);
      return 0;
}

static int snd_pcm_status_user(struct snd_pcm_substream *substream,
                         struct snd_pcm_status __user * _status)
{
      struct snd_pcm_status status;
      int res;
      
      memset(&status, 0, sizeof(status));
      res = snd_pcm_status(substream, &status);
      if (res < 0)
            return res;
      if (copy_to_user(_status, &status, sizeof(status)))
            return -EFAULT;
      return 0;
}

static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
                        struct snd_pcm_channel_info * info)
{
      struct snd_pcm_runtime *runtime;
      unsigned int channel;
      
      channel = info->channel;
      runtime = substream->runtime;
      snd_pcm_stream_lock_irq(substream);
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
            snd_pcm_stream_unlock_irq(substream);
            return -EBADFD;
      }
      snd_pcm_stream_unlock_irq(substream);
      if (channel >= runtime->channels)
            return -EINVAL;
      memset(info, 0, sizeof(*info));
      info->channel = channel;
      return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
}

static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
                             struct snd_pcm_channel_info __user * _info)
{
      struct snd_pcm_channel_info info;
      int res;
      
      if (copy_from_user(&info, _info, sizeof(info)))
            return -EFAULT;
      res = snd_pcm_channel_info(substream, &info);
      if (res < 0)
            return res;
      if (copy_to_user(_info, &info, sizeof(info)))
            return -EFAULT;
      return 0;
}

static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->trigger_master == NULL)
            return;
      if (runtime->trigger_master == substream) {
            snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
      } else {
            snd_pcm_trigger_tstamp(runtime->trigger_master);
            runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
      }
      runtime->trigger_master = NULL;
}

00693 struct action_ops {
      int (*pre_action)(struct snd_pcm_substream *substream, int state);
      int (*do_action)(struct snd_pcm_substream *substream, int state);
      void (*undo_action)(struct snd_pcm_substream *substream, int state);
      void (*post_action)(struct snd_pcm_substream *substream, int state);
};

/*
 *  this functions is core for handling of linked stream
 *  Note: the stream state might be changed also on failure
 *  Note2: call with calling stream lock + link lock
 */
static int snd_pcm_action_group(struct action_ops *ops,
                        struct snd_pcm_substream *substream,
                        int state, int do_lock)
{
      struct snd_pcm_substream *s = NULL;
      struct snd_pcm_substream *s1;
      int res = 0;

      snd_pcm_group_for_each_entry(s, substream) {
            if (do_lock && s != substream)
                  spin_lock_nested(&s->self_group.lock,
                               SINGLE_DEPTH_NESTING);
            res = ops->pre_action(s, state);
            if (res < 0)
                  goto _unlock;
      }
      snd_pcm_group_for_each_entry(s, substream) {
            res = ops->do_action(s, state);
            if (res < 0) {
                  if (ops->undo_action) {
                        snd_pcm_group_for_each_entry(s1, substream) {
                              if (s1 == s) /* failed stream */
                                    break;
                              ops->undo_action(s1, state);
                        }
                  }
                  s = NULL; /* unlock all */
                  goto _unlock;
            }
      }
      snd_pcm_group_for_each_entry(s, substream) {
            ops->post_action(s, state);
      }
 _unlock:
      if (do_lock) {
            /* unlock streams */
            snd_pcm_group_for_each_entry(s1, substream) {
                  if (s1 != substream)
                        spin_unlock(&s1->self_group.lock);
                  if (s1 == s)      /* end */
                        break;
            }
      }
      return res;
}

/*
 *  Note: call with stream lock
 */
static int snd_pcm_action_single(struct action_ops *ops,
                         struct snd_pcm_substream *substream,
                         int state)
{
      int res;
      
      res = ops->pre_action(substream, state);
      if (res < 0)
            return res;
      res = ops->do_action(substream, state);
      if (res == 0)
            ops->post_action(substream, state);
      else if (ops->undo_action)
            ops->undo_action(substream, state);
      return res;
}

/*
 *  Note: call with stream lock
 */
static int snd_pcm_action(struct action_ops *ops,
                    struct snd_pcm_substream *substream,
                    int state)
{
      int res;

      if (snd_pcm_stream_linked(substream)) {
            if (!spin_trylock(&substream->group->lock)) {
                  spin_unlock(&substream->self_group.lock);
                  spin_lock(&substream->group->lock);
                  spin_lock(&substream->self_group.lock);
            }
            res = snd_pcm_action_group(ops, substream, state, 1);
            spin_unlock(&substream->group->lock);
      } else {
            res = snd_pcm_action_single(ops, substream, state);
      }
      return res;
}

/*
 *  Note: don't use any locks before
 */
static int snd_pcm_action_lock_irq(struct action_ops *ops,
                           struct snd_pcm_substream *substream,
                           int state)
{
      int res;

      read_lock_irq(&snd_pcm_link_rwlock);
      if (snd_pcm_stream_linked(substream)) {
            spin_lock(&substream->group->lock);
            spin_lock(&substream->self_group.lock);
            res = snd_pcm_action_group(ops, substream, state, 1);
            spin_unlock(&substream->self_group.lock);
            spin_unlock(&substream->group->lock);
      } else {
            spin_lock(&substream->self_group.lock);
            res = snd_pcm_action_single(ops, substream, state);
            spin_unlock(&substream->self_group.lock);
      }
      read_unlock_irq(&snd_pcm_link_rwlock);
      return res;
}

/*
 */
static int snd_pcm_action_nonatomic(struct action_ops *ops,
                            struct snd_pcm_substream *substream,
                            int state)
{
      int res;

      down_read(&snd_pcm_link_rwsem);
      if (snd_pcm_stream_linked(substream))
            res = snd_pcm_action_group(ops, substream, state, 0);
      else
            res = snd_pcm_action_single(ops, substream, state);
      up_read(&snd_pcm_link_rwsem);
      return res;
}

/*
 * start callbacks
 */
static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
            return -EBADFD;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
          !snd_pcm_playback_data(substream))
            return -EPIPE;
      runtime->trigger_master = substream;
      return 0;
}

static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
{
      if (substream->runtime->trigger_master != substream)
            return 0;
      return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
}

static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
{
      if (substream->runtime->trigger_master == substream)
            substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
}

static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_trigger_tstamp(substream);
      runtime->hw_ptr_jiffies = jiffies;
      runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
                                              runtime->rate;
      runtime->status->state = state;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
          runtime->silence_size > 0)
            snd_pcm_playback_silence(substream, ULONG_MAX);
      if (substream->timer)
            snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
                         &runtime->trigger_tstamp);
}

static struct action_ops snd_pcm_action_start = {
      .pre_action = snd_pcm_pre_start,
      .do_action = snd_pcm_do_start,
      .undo_action = snd_pcm_undo_start,
      .post_action = snd_pcm_post_start
};

/**
 * snd_pcm_start - start all linked streams
 * @substream: the PCM substream instance
 */
int snd_pcm_start(struct snd_pcm_substream *substream)
{
      return snd_pcm_action(&snd_pcm_action_start, substream,
                        SNDRV_PCM_STATE_RUNNING);
}

/*
 * stop callbacks
 */
static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;
      runtime->trigger_master = substream;
      return 0;
}

static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
{
      if (substream->runtime->trigger_master == substream &&
          snd_pcm_running(substream))
            substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
      return 0; /* unconditonally stop all substreams */
}

static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->status->state != state) {
            snd_pcm_trigger_tstamp(substream);
            if (substream->timer)
                  snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
                               &runtime->trigger_tstamp);
            runtime->status->state = state;
      }
      wake_up(&runtime->sleep);
      wake_up(&runtime->tsleep);
}

static struct action_ops snd_pcm_action_stop = {
      .pre_action = snd_pcm_pre_stop,
      .do_action = snd_pcm_do_stop,
      .post_action = snd_pcm_post_stop
};

/**
 * snd_pcm_stop - try to stop all running streams in the substream group
 * @substream: the PCM substream instance
 * @state: PCM state after stopping the stream
 *
 * The state of each stream is then changed to the given state unconditionally.
 */
int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
{
      return snd_pcm_action(&snd_pcm_action_stop, substream, state);
}

EXPORT_SYMBOL(snd_pcm_stop);

/**
 * snd_pcm_drain_done - stop the DMA only when the given stream is playback
 * @substream: the PCM substream
 *
 * After stopping, the state is changed to SETUP.
 * Unlike snd_pcm_stop(), this affects only the given stream.
 */
int snd_pcm_drain_done(struct snd_pcm_substream *substream)
{
      return snd_pcm_action_single(&snd_pcm_action_stop, substream,
                             SNDRV_PCM_STATE_SETUP);
}

/*
 * pause callbacks
 */
static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
            return -ENOSYS;
      if (push) {
            if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
                  return -EBADFD;
      } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
            return -EBADFD;
      runtime->trigger_master = substream;
      return 0;
}

static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
{
      if (substream->runtime->trigger_master != substream)
            return 0;
      /* some drivers might use hw_ptr to recover from the pause -
         update the hw_ptr now */
      if (push)
            snd_pcm_update_hw_ptr(substream);
      /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
       * a delta between the current jiffies, this gives a large enough
       * delta, effectively to skip the check once.
       */
      substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
      return substream->ops->trigger(substream,
                               push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
                                    SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
}

static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
{
      if (substream->runtime->trigger_master == substream)
            substream->ops->trigger(substream,
                              push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
                              SNDRV_PCM_TRIGGER_PAUSE_PUSH);
}

static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_trigger_tstamp(substream);
      if (push) {
            runtime->status->state = SNDRV_PCM_STATE_PAUSED;
            if (substream->timer)
                  snd_timer_notify(substream->timer,
                               SNDRV_TIMER_EVENT_MPAUSE,
                               &runtime->trigger_tstamp);
            wake_up(&runtime->sleep);
            wake_up(&runtime->tsleep);
      } else {
            runtime->status->state = SNDRV_PCM_STATE_RUNNING;
            if (substream->timer)
                  snd_timer_notify(substream->timer,
                               SNDRV_TIMER_EVENT_MCONTINUE,
                               &runtime->trigger_tstamp);
      }
}

static struct action_ops snd_pcm_action_pause = {
      .pre_action = snd_pcm_pre_pause,
      .do_action = snd_pcm_do_pause,
      .undo_action = snd_pcm_undo_pause,
      .post_action = snd_pcm_post_pause
};

/*
 * Push/release the pause for all linked streams.
 */
static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
{
      return snd_pcm_action(&snd_pcm_action_pause, substream, push);
}

#ifdef CONFIG_PM
/* suspend */

static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
            return -EBUSY;
      runtime->trigger_master = substream;
      return 0;
}

static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->trigger_master != substream)
            return 0;
      if (! snd_pcm_running(substream))
            return 0;
      substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
      return 0; /* suspend unconditionally */
}

static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_trigger_tstamp(substream);
      if (substream->timer)
            snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
                         &runtime->trigger_tstamp);
      runtime->status->suspended_state = runtime->status->state;
      runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
      wake_up(&runtime->sleep);
      wake_up(&runtime->tsleep);
}

static struct action_ops snd_pcm_action_suspend = {
      .pre_action = snd_pcm_pre_suspend,
      .do_action = snd_pcm_do_suspend,
      .post_action = snd_pcm_post_suspend
};

/**
 * snd_pcm_suspend - trigger SUSPEND to all linked streams
 * @substream: the PCM substream
 *
 * After this call, all streams are changed to SUSPENDED state.
 */
int snd_pcm_suspend(struct snd_pcm_substream *substream)
{
      int err;
      unsigned long flags;

      if (! substream)
            return 0;

      snd_pcm_stream_lock_irqsave(substream, flags);
      err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
      snd_pcm_stream_unlock_irqrestore(substream, flags);
      return err;
}

EXPORT_SYMBOL(snd_pcm_suspend);

/**
 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
 * @pcm: the PCM instance
 *
 * After this call, all streams are changed to SUSPENDED state.
 */
int snd_pcm_suspend_all(struct snd_pcm *pcm)
{
      struct snd_pcm_substream *substream;
      int stream, err = 0;

      if (! pcm)
            return 0;

      for (stream = 0; stream < 2; stream++) {
            for (substream = pcm->streams[stream].substream;
                 substream; substream = substream->next) {
                  /* FIXME: the open/close code should lock this as well */
                  if (substream->runtime == NULL)
                        continue;
                  err = snd_pcm_suspend(substream);
                  if (err < 0 && err != -EBUSY)
                        return err;
            }
      }
      return 0;
}

EXPORT_SYMBOL(snd_pcm_suspend_all);

/* resume */

static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
            return -ENOSYS;
      runtime->trigger_master = substream;
      return 0;
}

static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->trigger_master != substream)
            return 0;
      /* DMA not running previously? */
      if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
          (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
           substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
            return 0;
      return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
}

static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
{
      if (substream->runtime->trigger_master == substream &&
          snd_pcm_running(substream))
            substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
}

static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_trigger_tstamp(substream);
      if (substream->timer)
            snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
                         &runtime->trigger_tstamp);
      runtime->status->state = runtime->status->suspended_state;
}

static struct action_ops snd_pcm_action_resume = {
      .pre_action = snd_pcm_pre_resume,
      .do_action = snd_pcm_do_resume,
      .undo_action = snd_pcm_undo_resume,
      .post_action = snd_pcm_post_resume
};

static int snd_pcm_resume(struct snd_pcm_substream *substream)
{
      struct snd_card *card = substream->pcm->card;
      int res;

      snd_power_lock(card);
      if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
            res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
      snd_power_unlock(card);
      return res;
}

#else

static int snd_pcm_resume(struct snd_pcm_substream *substream)
{
      return -ENOSYS;
}

#endif /* CONFIG_PM */

/*
 * xrun ioctl
 *
 * Change the RUNNING stream(s) to XRUN state.
 */
static int snd_pcm_xrun(struct snd_pcm_substream *substream)
{
      struct snd_card *card = substream->pcm->card;
      struct snd_pcm_runtime *runtime = substream->runtime;
      int result;

      snd_power_lock(card);
      if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
            result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
            if (result < 0)
                  goto _unlock;
      }

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_XRUN:
            result = 0; /* already there */
            break;
      case SNDRV_PCM_STATE_RUNNING:
            result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
            break;
      default:
            result = -EBADFD;
      }
      snd_pcm_stream_unlock_irq(substream);
 _unlock:
      snd_power_unlock(card);
      return result;
}

/*
 * reset ioctl
 */
static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_RUNNING:
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_PAUSED:
      case SNDRV_PCM_STATE_SUSPENDED:
            return 0;
      default:
            return -EBADFD;
      }
}

static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
      if (err < 0)
            return err;
      runtime->hw_ptr_base = 0;
      runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
            runtime->status->hw_ptr % runtime->period_size;
      runtime->silence_start = runtime->status->hw_ptr;
      runtime->silence_filled = 0;
      return 0;
}

static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      runtime->control->appl_ptr = runtime->status->hw_ptr;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
          runtime->silence_size > 0)
            snd_pcm_playback_silence(substream, ULONG_MAX);
}

static struct action_ops snd_pcm_action_reset = {
      .pre_action = snd_pcm_pre_reset,
      .do_action = snd_pcm_do_reset,
      .post_action = snd_pcm_post_reset
};

static int snd_pcm_reset(struct snd_pcm_substream *substream)
{
      return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
}

/*
 * prepare ioctl
 */
/* we use the second argument for updating f_flags */
static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
                         int f_flags)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
          runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
            return -EBADFD;
      if (snd_pcm_running(substream))
            return -EBUSY;
      substream->f_flags = f_flags;
      return 0;
}

static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
{
      int err;
      err = substream->ops->prepare(substream);
      if (err < 0)
            return err;
      return snd_pcm_do_reset(substream, 0);
}

static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      runtime->control->appl_ptr = runtime->status->hw_ptr;
      runtime->status->state = SNDRV_PCM_STATE_PREPARED;
}

static struct action_ops snd_pcm_action_prepare = {
      .pre_action = snd_pcm_pre_prepare,
      .do_action = snd_pcm_do_prepare,
      .post_action = snd_pcm_post_prepare
};

/**
 * snd_pcm_prepare - prepare the PCM substream to be triggerable
 * @substream: the PCM substream instance
 * @file: file to refer f_flags
 */
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
                     struct file *file)
{
      int res;
      struct snd_card *card = substream->pcm->card;
      int f_flags;

      if (file)
            f_flags = file->f_flags;
      else
            f_flags = substream->f_flags;

      snd_power_lock(card);
      if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
            res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
                                     substream, f_flags);
      snd_power_unlock(card);
      return res;
}

/*
 * drain ioctl
 */

static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
{
      substream->runtime->trigger_master = substream;
      return 0;
}

static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            switch (runtime->status->state) {
            case SNDRV_PCM_STATE_PREPARED:
                  /* start playback stream if possible */
                  if (! snd_pcm_playback_empty(substream)) {
                        snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
                        snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
                  }
                  break;
            case SNDRV_PCM_STATE_RUNNING:
                  runtime->status->state = SNDRV_PCM_STATE_DRAINING;
                  break;
            default:
                  break;
            }
      } else {
            /* stop running stream */
            if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
                  int new_state = snd_pcm_capture_avail(runtime) > 0 ?
                        SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
                  snd_pcm_do_stop(substream, new_state);
                  snd_pcm_post_stop(substream, new_state);
            }
      }
      return 0;
}

static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
{
}

static struct action_ops snd_pcm_action_drain_init = {
      .pre_action = snd_pcm_pre_drain_init,
      .do_action = snd_pcm_do_drain_init,
      .post_action = snd_pcm_post_drain_init
};

static int snd_pcm_drop(struct snd_pcm_substream *substream);

/*
 * Drain the stream(s).
 * When the substream is linked, sync until the draining of all playback streams
 * is finished.
 * After this call, all streams are supposed to be either SETUP or DRAINING
 * (capture only) state.
 */
static int snd_pcm_drain(struct snd_pcm_substream *substream,
                   struct file *file)
{
      struct snd_card *card;
      struct snd_pcm_runtime *runtime;
      struct snd_pcm_substream *s;
      wait_queue_t wait;
      int result = 0;
      int nonblock = 0;

      card = substream->pcm->card;
      runtime = substream->runtime;

      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;

      snd_power_lock(card);
      if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
            result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
            if (result < 0) {
                  snd_power_unlock(card);
                  return result;
            }
      }

      if (file) {
            if (file->f_flags & O_NONBLOCK)
                  nonblock = 1;
      } else if (substream->f_flags & O_NONBLOCK)
            nonblock = 1;

      down_read(&snd_pcm_link_rwsem);
      snd_pcm_stream_lock_irq(substream);
      /* resume pause */
      if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
            snd_pcm_pause(substream, 0);

      /* pre-start/stop - all running streams are changed to DRAINING state */
      result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
      if (result < 0)
            goto unlock;
      /* in non-blocking, we don't wait in ioctl but let caller poll */
      if (nonblock) {
            result = -EAGAIN;
            goto unlock;
      }

      for (;;) {
            long tout;
            struct snd_pcm_runtime *to_check;
            if (signal_pending(current)) {
                  result = -ERESTARTSYS;
                  break;
            }
            /* find a substream to drain */
            to_check = NULL;
            snd_pcm_group_for_each_entry(s, substream) {
                  if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
                        continue;
                  runtime = s->runtime;
                  if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
                        to_check = runtime;
                        break;
                  }
            }
            if (!to_check)
                  break; /* all drained */
            init_waitqueue_entry(&wait, current);
            add_wait_queue(&to_check->sleep, &wait);
            set_current_state(TASK_INTERRUPTIBLE);
            snd_pcm_stream_unlock_irq(substream);
            up_read(&snd_pcm_link_rwsem);
            snd_power_unlock(card);
            tout = schedule_timeout(10 * HZ);
            snd_power_lock(card);
            down_read(&snd_pcm_link_rwsem);
            snd_pcm_stream_lock_irq(substream);
            remove_wait_queue(&to_check->sleep, &wait);
            if (tout == 0) {
                  if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
                        result = -ESTRPIPE;
                  else {
                        snd_printd("playback drain error (DMA or IRQ trouble?)\n");
                        snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
                        result = -EIO;
                  }
                  break;
            }
      }

 unlock:
      snd_pcm_stream_unlock_irq(substream);
      up_read(&snd_pcm_link_rwsem);
      snd_power_unlock(card);

      return result;
}

/*
 * drop ioctl
 *
 * Immediately put all linked substreams into SETUP state.
 */
static int snd_pcm_drop(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime;
      struct snd_card *card;
      int result = 0;
      
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      card = substream->pcm->card;

      if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
          runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
          runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
            return -EBADFD;

      snd_pcm_stream_lock_irq(substream);
      /* resume pause */
      if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
            snd_pcm_pause(substream, 0);

      snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
      /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
      snd_pcm_stream_unlock_irq(substream);

      return result;
}


/* WARNING: Don't forget to fput back the file */
static struct file *snd_pcm_file_fd(int fd)
{
      struct file *file;
      struct inode *inode;
      unsigned int minor;

      file = fget(fd);
      if (!file)
            return NULL;
      inode = file->f_path.dentry->d_inode;
      if (!S_ISCHR(inode->i_mode) ||
          imajor(inode) != snd_major) {
            fput(file);
            return NULL;
      }
      minor = iminor(inode);
      if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
          !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
            fput(file);
            return NULL;
      }
      return file;
}

/*
 * PCM link handling
 */
static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
{
      int res = 0;
      struct file *file;
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream1;

      file = snd_pcm_file_fd(fd);
      if (!file)
            return -EBADFD;
      pcm_file = file->private_data;
      substream1 = pcm_file->substream;
      down_write(&snd_pcm_link_rwsem);
      write_lock_irq(&snd_pcm_link_rwlock);
      if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
          substream->runtime->status->state != substream1->runtime->status->state) {
            res = -EBADFD;
            goto _end;
      }
      if (snd_pcm_stream_linked(substream1)) {
            res = -EALREADY;
            goto _end;
      }
      if (!snd_pcm_stream_linked(substream)) {
            substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
            if (substream->group == NULL) {
                  res = -ENOMEM;
                  goto _end;
            }
            spin_lock_init(&substream->group->lock);
            INIT_LIST_HEAD(&substream->group->substreams);
            list_add_tail(&substream->link_list, &substream->group->substreams);
            substream->group->count = 1;
      }
      list_add_tail(&substream1->link_list, &substream->group->substreams);
      substream->group->count++;
      substream1->group = substream->group;
 _end:
      write_unlock_irq(&snd_pcm_link_rwlock);
      up_write(&snd_pcm_link_rwsem);
      fput(file);
      return res;
}

static void relink_to_local(struct snd_pcm_substream *substream)
{
      substream->group = &substream->self_group;
      INIT_LIST_HEAD(&substream->self_group.substreams);
      list_add_tail(&substream->link_list, &substream->self_group.substreams);
}

static int snd_pcm_unlink(struct snd_pcm_substream *substream)
{
      struct snd_pcm_substream *s;
      int res = 0;

      down_write(&snd_pcm_link_rwsem);
      write_lock_irq(&snd_pcm_link_rwlock);
      if (!snd_pcm_stream_linked(substream)) {
            res = -EALREADY;
            goto _end;
      }
      list_del(&substream->link_list);
      substream->group->count--;
      if (substream->group->count == 1) { /* detach the last stream, too */
            snd_pcm_group_for_each_entry(s, substream) {
                  relink_to_local(s);
                  break;
            }
            kfree(substream->group);
      }
      relink_to_local(substream);
       _end:
      write_unlock_irq(&snd_pcm_link_rwlock);
      up_write(&snd_pcm_link_rwsem);
      return res;
}

/*
 * hw configurator
 */
static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
                         struct snd_pcm_hw_rule *rule)
{
      struct snd_interval t;
      snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
                 hw_param_interval_c(params, rule->deps[1]), &t);
      return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
                         struct snd_pcm_hw_rule *rule)
{
      struct snd_interval t;
      snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
                 hw_param_interval_c(params, rule->deps[1]), &t);
      return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
                           struct snd_pcm_hw_rule *rule)
{
      struct snd_interval t;
      snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
                   hw_param_interval_c(params, rule->deps[1]),
                   (unsigned long) rule->private, &t);
      return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
                           struct snd_pcm_hw_rule *rule)
{
      struct snd_interval t;
      snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
                   (unsigned long) rule->private,
                   hw_param_interval_c(params, rule->deps[1]), &t);
      return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
                          struct snd_pcm_hw_rule *rule)
{
      unsigned int k;
      struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
      struct snd_mask m;
      struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
      snd_mask_any(&m);
      for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
            int bits;
            if (! snd_mask_test(mask, k))
                  continue;
            bits = snd_pcm_format_physical_width(k);
            if (bits <= 0)
                  continue; /* ignore invalid formats */
            if ((unsigned)bits < i->min || (unsigned)bits > i->max)
                  snd_mask_reset(&m, k);
      }
      return snd_mask_refine(mask, &m);
}

static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
                               struct snd_pcm_hw_rule *rule)
{
      struct snd_interval t;
      unsigned int k;
      t.min = UINT_MAX;
      t.max = 0;
      t.openmin = 0;
      t.openmax = 0;
      for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
            int bits;
            if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
                  continue;
            bits = snd_pcm_format_physical_width(k);
            if (bits <= 0)
                  continue; /* ignore invalid formats */
            if (t.min > (unsigned)bits)
                  t.min = bits;
            if (t.max < (unsigned)bits)
                  t.max = bits;
      }
      t.integer = 1;
      return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}

#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
#error "Change this table"
#endif

static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
                                 48000, 64000, 88200, 96000, 176400, 192000 };

const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
      .count = ARRAY_SIZE(rates),
      .list = rates,
};

static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
                        struct snd_pcm_hw_rule *rule)
{
      struct snd_pcm_hardware *hw = rule->private;
      return snd_interval_list(hw_param_interval(params, rule->var),
                         snd_pcm_known_rates.count,
                         snd_pcm_known_rates.list, hw->rates);
}           

static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
                                  struct snd_pcm_hw_rule *rule)
{
      struct snd_interval t;
      struct snd_pcm_substream *substream = rule->private;
      t.min = 0;
      t.max = substream->buffer_bytes_max;
      t.openmin = 0;
      t.openmax = 0;
      t.integer = 1;
      return snd_interval_refine(hw_param_interval(params, rule->var), &t);
}           

int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
      int k, err;

      for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
            snd_mask_any(constrs_mask(constrs, k));
      }

      for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
            snd_interval_any(constrs_interval(constrs, k));
      }

      snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
      snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
      snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
      snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
      snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));

      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
                           snd_pcm_hw_rule_format, NULL,
                           SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
                          snd_pcm_hw_rule_sample_bits, NULL,
                          SNDRV_PCM_HW_PARAM_FORMAT, 
                          SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 
                          snd_pcm_hw_rule_div, NULL,
                          SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
                          snd_pcm_hw_rule_mul, NULL,
                          SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 8,
                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 8,
                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 
                          snd_pcm_hw_rule_div, NULL,
                          SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
                          SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
                          SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 
                          snd_pcm_hw_rule_div, NULL,
                          SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
                          snd_pcm_hw_rule_div, NULL,
                          SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 8,
                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 
                          snd_pcm_hw_rule_muldivk, (void*) 1000000,
                          SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
                          snd_pcm_hw_rule_mul, NULL,
                          SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 8,
                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 
                          snd_pcm_hw_rule_muldivk, (void*) 1000000,
                          SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 
                          snd_pcm_hw_rule_muldivk, (void*) 8,
                          SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
                          snd_pcm_hw_rule_muldivk, (void*) 8,
                          SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
                          SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
      if (err < 0)
            return err;
      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 
                          snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
                          SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
      if (err < 0)
            return err;
      return 0;
}

int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_pcm_hardware *hw = &runtime->hw;
      int err;
      unsigned int mask = 0;

        if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
            mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
        if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
            mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
      if (hw->info & SNDRV_PCM_INFO_MMAP) {
            if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
                  mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
            if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
                  mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
            if (hw->info & SNDRV_PCM_INFO_COMPLEX)
                  mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
      }
      err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
                                 hw->channels_min, hw->channels_max);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
                                 hw->rate_min, hw->rate_max);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
                                 hw->period_bytes_min, hw->period_bytes_max);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
                                 hw->periods_min, hw->periods_max);
      if (err < 0)
            return err;

      err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
                                 hw->period_bytes_min, hw->buffer_bytes_max);
      if (err < 0)
            return err;

      err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 
                          snd_pcm_hw_rule_buffer_bytes_max, substream,
                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
      if (err < 0)
            return err;

      /* FIXME: remove */
      if (runtime->dma_bytes) {
            err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
            if (err < 0)
                  return -EINVAL;
      }

      if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
            err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 
                                snd_pcm_hw_rule_rate, hw,
                                SNDRV_PCM_HW_PARAM_RATE, -1);
            if (err < 0)
                  return err;
      }

      /* FIXME: this belong to lowlevel */
      snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);

      return 0;
}

static void pcm_release_private(struct snd_pcm_substream *substream)
{
      snd_pcm_unlink(substream);
}

void snd_pcm_release_substream(struct snd_pcm_substream *substream)
{
      substream->ref_count--;
      if (substream->ref_count > 0)
            return;

      snd_pcm_drop(substream);
      if (substream->hw_opened) {
            if (substream->ops->hw_free != NULL)
                  substream->ops->hw_free(substream);
            substream->ops->close(substream);
            substream->hw_opened = 0;
      }
      if (pm_qos_request_active(&substream->latency_pm_qos_req))
            pm_qos_remove_request(&substream->latency_pm_qos_req);
      if (substream->pcm_release) {
            substream->pcm_release(substream);
            substream->pcm_release = NULL;
      }
      snd_pcm_detach_substream(substream);
}

EXPORT_SYMBOL(snd_pcm_release_substream);

int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
                     struct file *file,
                     struct snd_pcm_substream **rsubstream)
{
      struct snd_pcm_substream *substream;
      int err;

      err = snd_pcm_attach_substream(pcm, stream, file, &substream);
      if (err < 0)
            return err;
      if (substream->ref_count > 1) {
            *rsubstream = substream;
            return 0;
      }

      err = snd_pcm_hw_constraints_init(substream);
      if (err < 0) {
            snd_printd("snd_pcm_hw_constraints_init failed\n");
            goto error;
      }

      if ((err = substream->ops->open(substream)) < 0)
            goto error;

      substream->hw_opened = 1;

      err = snd_pcm_hw_constraints_complete(substream);
      if (err < 0) {
            snd_printd("snd_pcm_hw_constraints_complete failed\n");
            goto error;
      }

      *rsubstream = substream;
      return 0;

 error:
      snd_pcm_release_substream(substream);
      return err;
}

EXPORT_SYMBOL(snd_pcm_open_substream);

static int snd_pcm_open_file(struct file *file,
                       struct snd_pcm *pcm,
                       int stream,
                       struct snd_pcm_file **rpcm_file)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_str *str;
      int err;

      if (rpcm_file)
            *rpcm_file = NULL;

      err = snd_pcm_open_substream(pcm, stream, file, &substream);
      if (err < 0)
            return err;

      pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
      if (pcm_file == NULL) {
            snd_pcm_release_substream(substream);
            return -ENOMEM;
      }
      pcm_file->substream = substream;
      if (substream->ref_count == 1) {
            str = substream->pstr;
            substream->file = pcm_file;
            substream->pcm_release = pcm_release_private;
      }
      file->private_data = pcm_file;
      if (rpcm_file)
            *rpcm_file = pcm_file;
      return 0;
}

static int snd_pcm_playback_open(struct inode *inode, struct file *file)
{
      struct snd_pcm *pcm;
      int err = nonseekable_open(inode, file);
      if (err < 0)
            return err;
      pcm = snd_lookup_minor_data(iminor(inode),
                            SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
      return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
}

static int snd_pcm_capture_open(struct inode *inode, struct file *file)
{
      struct snd_pcm *pcm;
      int err = nonseekable_open(inode, file);
      if (err < 0)
            return err;
      pcm = snd_lookup_minor_data(iminor(inode),
                            SNDRV_DEVICE_TYPE_PCM_CAPTURE);
      return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
}

static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
{
      int err;
      struct snd_pcm_file *pcm_file;
      wait_queue_t wait;

      if (pcm == NULL) {
            err = -ENODEV;
            goto __error1;
      }
      err = snd_card_file_add(pcm->card, file);
      if (err < 0)
            goto __error1;
      if (!try_module_get(pcm->card->module)) {
            err = -EFAULT;
            goto __error2;
      }
      init_waitqueue_entry(&wait, current);
      add_wait_queue(&pcm->open_wait, &wait);
      mutex_lock(&pcm->open_mutex);
      while (1) {
            err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
            if (err >= 0)
                  break;
            if (err == -EAGAIN) {
                  if (file->f_flags & O_NONBLOCK) {
                        err = -EBUSY;
                        break;
                  }
            } else
                  break;
            set_current_state(TASK_INTERRUPTIBLE);
            mutex_unlock(&pcm->open_mutex);
            schedule();
            mutex_lock(&pcm->open_mutex);
            if (signal_pending(current)) {
                  err = -ERESTARTSYS;
                  break;
            }
      }
      remove_wait_queue(&pcm->open_wait, &wait);
      mutex_unlock(&pcm->open_mutex);
      if (err < 0)
            goto __error;
      return err;

      __error:
      module_put(pcm->card->module);
      __error2:
            snd_card_file_remove(pcm->card, file);
      __error1:
            return err;
}

static int snd_pcm_release(struct inode *inode, struct file *file)
{
      struct snd_pcm *pcm;
      struct snd_pcm_substream *substream;
      struct snd_pcm_file *pcm_file;

      pcm_file = file->private_data;
      substream = pcm_file->substream;
      if (snd_BUG_ON(!substream))
            return -ENXIO;
      pcm = substream->pcm;
      mutex_lock(&pcm->open_mutex);
      snd_pcm_release_substream(substream);
      kfree(pcm_file);
      mutex_unlock(&pcm->open_mutex);
      wake_up(&pcm->open_wait);
      module_put(pcm->card->module);
      snd_card_file_remove(pcm->card, file);
      return 0;
}

static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
                                     snd_pcm_uframes_t frames)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_sframes_t appl_ptr;
      snd_pcm_sframes_t ret;
      snd_pcm_sframes_t hw_avail;

      if (frames == 0)
            return 0;

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_PREPARED:
            break;
      case SNDRV_PCM_STATE_DRAINING:
      case SNDRV_PCM_STATE_RUNNING:
            if (snd_pcm_update_hw_ptr(substream) >= 0)
                  break;
            /* Fall through */
      case SNDRV_PCM_STATE_XRUN:
            ret = -EPIPE;
            goto __end;
      case SNDRV_PCM_STATE_SUSPENDED:
            ret = -ESTRPIPE;
            goto __end;
      default:
            ret = -EBADFD;
            goto __end;
      }

      hw_avail = snd_pcm_playback_hw_avail(runtime);
      if (hw_avail <= 0) {
            ret = 0;
            goto __end;
      }
      if (frames > (snd_pcm_uframes_t)hw_avail)
            frames = hw_avail;
      appl_ptr = runtime->control->appl_ptr - frames;
      if (appl_ptr < 0)
            appl_ptr += runtime->boundary;
      runtime->control->appl_ptr = appl_ptr;
      ret = frames;
 __end:
      snd_pcm_stream_unlock_irq(substream);
      return ret;
}

static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
                                    snd_pcm_uframes_t frames)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_sframes_t appl_ptr;
      snd_pcm_sframes_t ret;
      snd_pcm_sframes_t hw_avail;

      if (frames == 0)
            return 0;

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_DRAINING:
            break;
      case SNDRV_PCM_STATE_RUNNING:
            if (snd_pcm_update_hw_ptr(substream) >= 0)
                  break;
            /* Fall through */
      case SNDRV_PCM_STATE_XRUN:
            ret = -EPIPE;
            goto __end;
      case SNDRV_PCM_STATE_SUSPENDED:
            ret = -ESTRPIPE;
            goto __end;
      default:
            ret = -EBADFD;
            goto __end;
      }

      hw_avail = snd_pcm_capture_hw_avail(runtime);
      if (hw_avail <= 0) {
            ret = 0;
            goto __end;
      }
      if (frames > (snd_pcm_uframes_t)hw_avail)
            frames = hw_avail;
      appl_ptr = runtime->control->appl_ptr - frames;
      if (appl_ptr < 0)
            appl_ptr += runtime->boundary;
      runtime->control->appl_ptr = appl_ptr;
      ret = frames;
 __end:
      snd_pcm_stream_unlock_irq(substream);
      return ret;
}

static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
                                      snd_pcm_uframes_t frames)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_sframes_t appl_ptr;
      snd_pcm_sframes_t ret;
      snd_pcm_sframes_t avail;

      if (frames == 0)
            return 0;

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_PAUSED:
            break;
      case SNDRV_PCM_STATE_DRAINING:
      case SNDRV_PCM_STATE_RUNNING:
            if (snd_pcm_update_hw_ptr(substream) >= 0)
                  break;
            /* Fall through */
      case SNDRV_PCM_STATE_XRUN:
            ret = -EPIPE;
            goto __end;
      case SNDRV_PCM_STATE_SUSPENDED:
            ret = -ESTRPIPE;
            goto __end;
      default:
            ret = -EBADFD;
            goto __end;
      }

      avail = snd_pcm_playback_avail(runtime);
      if (avail <= 0) {
            ret = 0;
            goto __end;
      }
      if (frames > (snd_pcm_uframes_t)avail)
            frames = avail;
      appl_ptr = runtime->control->appl_ptr + frames;
      if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
            appl_ptr -= runtime->boundary;
      runtime->control->appl_ptr = appl_ptr;
      ret = frames;
 __end:
      snd_pcm_stream_unlock_irq(substream);
      return ret;
}

static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
                                     snd_pcm_uframes_t frames)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_sframes_t appl_ptr;
      snd_pcm_sframes_t ret;
      snd_pcm_sframes_t avail;

      if (frames == 0)
            return 0;

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_DRAINING:
      case SNDRV_PCM_STATE_PAUSED:
            break;
      case SNDRV_PCM_STATE_RUNNING:
            if (snd_pcm_update_hw_ptr(substream) >= 0)
                  break;
            /* Fall through */
      case SNDRV_PCM_STATE_XRUN:
            ret = -EPIPE;
            goto __end;
      case SNDRV_PCM_STATE_SUSPENDED:
            ret = -ESTRPIPE;
            goto __end;
      default:
            ret = -EBADFD;
            goto __end;
      }

      avail = snd_pcm_capture_avail(runtime);
      if (avail <= 0) {
            ret = 0;
            goto __end;
      }
      if (frames > (snd_pcm_uframes_t)avail)
            frames = avail;
      appl_ptr = runtime->control->appl_ptr + frames;
      if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
            appl_ptr -= runtime->boundary;
      runtime->control->appl_ptr = appl_ptr;
      ret = frames;
 __end:
      snd_pcm_stream_unlock_irq(substream);
      return ret;
}

static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int err;

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_DRAINING:
            if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
                  goto __badfd;
      case SNDRV_PCM_STATE_RUNNING:
            if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
                  break;
            /* Fall through */
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_SUSPENDED:
            err = 0;
            break;
      case SNDRV_PCM_STATE_XRUN:
            err = -EPIPE;
            break;
      default:
            __badfd:
            err = -EBADFD;
            break;
      }
      snd_pcm_stream_unlock_irq(substream);
      return err;
}
            
static int snd_pcm_delay(struct snd_pcm_substream *substream,
                   snd_pcm_sframes_t __user *res)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int err;
      snd_pcm_sframes_t n = 0;

      snd_pcm_stream_lock_irq(substream);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_DRAINING:
            if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
                  goto __badfd;
      case SNDRV_PCM_STATE_RUNNING:
            if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
                  break;
            /* Fall through */
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_SUSPENDED:
            err = 0;
            if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                  n = snd_pcm_playback_hw_avail(runtime);
            else
                  n = snd_pcm_capture_avail(runtime);
            n += runtime->delay;
            break;
      case SNDRV_PCM_STATE_XRUN:
            err = -EPIPE;
            break;
      default:
            __badfd:
            err = -EBADFD;
            break;
      }
      snd_pcm_stream_unlock_irq(substream);
      if (!err)
            if (put_user(n, res))
                  err = -EFAULT;
      return err;
}
            
static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
                      struct snd_pcm_sync_ptr __user *_sync_ptr)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_pcm_sync_ptr sync_ptr;
      volatile struct snd_pcm_mmap_status *status;
      volatile struct snd_pcm_mmap_control *control;
      int err;

      memset(&sync_ptr, 0, sizeof(sync_ptr));
      if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
            return -EFAULT;
      if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
            return -EFAULT;   
      status = runtime->status;
      control = runtime->control;
      if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
            err = snd_pcm_hwsync(substream);
            if (err < 0)
                  return err;
      }
      snd_pcm_stream_lock_irq(substream);
      if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
            control->appl_ptr = sync_ptr.c.control.appl_ptr;
      else
            sync_ptr.c.control.appl_ptr = control->appl_ptr;
      if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
            control->avail_min = sync_ptr.c.control.avail_min;
      else
            sync_ptr.c.control.avail_min = control->avail_min;
      sync_ptr.s.status.state = status->state;
      sync_ptr.s.status.hw_ptr = status->hw_ptr;
      sync_ptr.s.status.tstamp = status->tstamp;
      sync_ptr.s.status.suspended_state = status->suspended_state;
      snd_pcm_stream_unlock_irq(substream);
      if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
            return -EFAULT;
      return 0;
}

static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int arg;
      
      if (get_user(arg, _arg))
            return -EFAULT;
      if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
            return -EINVAL;
      runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
      if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
            runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
      return 0;
}
            
static int snd_pcm_common_ioctl1(struct file *file,
                         struct snd_pcm_substream *substream,
                         unsigned int cmd, void __user *arg)
{
      switch (cmd) {
      case SNDRV_PCM_IOCTL_PVERSION:
            return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
      case SNDRV_PCM_IOCTL_INFO:
            return snd_pcm_info_user(substream, arg);
      case SNDRV_PCM_IOCTL_TSTAMP:  /* just for compatibility */
            return 0;
      case SNDRV_PCM_IOCTL_TTSTAMP:
            return snd_pcm_tstamp(substream, arg);
      case SNDRV_PCM_IOCTL_HW_REFINE:
            return snd_pcm_hw_refine_user(substream, arg);
      case SNDRV_PCM_IOCTL_HW_PARAMS:
            return snd_pcm_hw_params_user(substream, arg);
      case SNDRV_PCM_IOCTL_HW_FREE:
            return snd_pcm_hw_free(substream);
      case SNDRV_PCM_IOCTL_SW_PARAMS:
            return snd_pcm_sw_params_user(substream, arg);
      case SNDRV_PCM_IOCTL_STATUS:
            return snd_pcm_status_user(substream, arg);
      case SNDRV_PCM_IOCTL_CHANNEL_INFO:
            return snd_pcm_channel_info_user(substream, arg);
      case SNDRV_PCM_IOCTL_PREPARE:
            return snd_pcm_prepare(substream, file);
      case SNDRV_PCM_IOCTL_RESET:
            return snd_pcm_reset(substream);
      case SNDRV_PCM_IOCTL_START:
            return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
      case SNDRV_PCM_IOCTL_LINK:
            return snd_pcm_link(substream, (int)(unsigned long) arg);
      case SNDRV_PCM_IOCTL_UNLINK:
            return snd_pcm_unlink(substream);
      case SNDRV_PCM_IOCTL_RESUME:
            return snd_pcm_resume(substream);
      case SNDRV_PCM_IOCTL_XRUN:
            return snd_pcm_xrun(substream);
      case SNDRV_PCM_IOCTL_HWSYNC:
            return snd_pcm_hwsync(substream);
      case SNDRV_PCM_IOCTL_DELAY:
            return snd_pcm_delay(substream, arg);
      case SNDRV_PCM_IOCTL_SYNC_PTR:
            return snd_pcm_sync_ptr(substream, arg);
#ifdef CONFIG_SND_SUPPORT_OLD_API
      case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
            return snd_pcm_hw_refine_old_user(substream, arg);
      case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
            return snd_pcm_hw_params_old_user(substream, arg);
#endif
      case SNDRV_PCM_IOCTL_DRAIN:
            return snd_pcm_drain(substream, file);
      case SNDRV_PCM_IOCTL_DROP:
            return snd_pcm_drop(substream);
      case SNDRV_PCM_IOCTL_PAUSE:
      {
            int res;
            snd_pcm_stream_lock_irq(substream);
            res = snd_pcm_pause(substream, (int)(unsigned long)arg);
            snd_pcm_stream_unlock_irq(substream);
            return res;
      }
      }
      snd_printd("unknown ioctl = 0x%x\n", cmd);
      return -ENOTTY;
}

static int snd_pcm_playback_ioctl1(struct file *file,
                           struct snd_pcm_substream *substream,
                           unsigned int cmd, void __user *arg)
{
      if (snd_BUG_ON(!substream))
            return -ENXIO;
      if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
            return -EINVAL;
      switch (cmd) {
      case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
      {
            struct snd_xferi xferi;
            struct snd_xferi __user *_xferi = arg;
            struct snd_pcm_runtime *runtime = substream->runtime;
            snd_pcm_sframes_t result;
            if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
                  return -EBADFD;
            if (put_user(0, &_xferi->result))
                  return -EFAULT;
            if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
                  return -EFAULT;
            result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
            __put_user(result, &_xferi->result);
            return result < 0 ? result : 0;
      }
      case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
      {
            struct snd_xfern xfern;
            struct snd_xfern __user *_xfern = arg;
            struct snd_pcm_runtime *runtime = substream->runtime;
            void __user **bufs;
            snd_pcm_sframes_t result;
            if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
                  return -EBADFD;
            if (runtime->channels > 128)
                  return -EINVAL;
            if (put_user(0, &_xfern->result))
                  return -EFAULT;
            if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
                  return -EFAULT;

            bufs = memdup_user(xfern.bufs,
                           sizeof(void *) * runtime->channels);
            if (IS_ERR(bufs))
                  return PTR_ERR(bufs);
            result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
            kfree(bufs);
            __put_user(result, &_xfern->result);
            return result < 0 ? result : 0;
      }
      case SNDRV_PCM_IOCTL_REWIND:
      {
            snd_pcm_uframes_t frames;
            snd_pcm_uframes_t __user *_frames = arg;
            snd_pcm_sframes_t result;
            if (get_user(frames, _frames))
                  return -EFAULT;
            if (put_user(0, _frames))
                  return -EFAULT;
            result = snd_pcm_playback_rewind(substream, frames);
            __put_user(result, _frames);
            return result < 0 ? result : 0;
      }
      case SNDRV_PCM_IOCTL_FORWARD:
      {
            snd_pcm_uframes_t frames;
            snd_pcm_uframes_t __user *_frames = arg;
            snd_pcm_sframes_t result;
            if (get_user(frames, _frames))
                  return -EFAULT;
            if (put_user(0, _frames))
                  return -EFAULT;
            result = snd_pcm_playback_forward(substream, frames);
            __put_user(result, _frames);
            return result < 0 ? result : 0;
      }
      }
      return snd_pcm_common_ioctl1(file, substream, cmd, arg);
}

static int snd_pcm_capture_ioctl1(struct file *file,
                          struct snd_pcm_substream *substream,
                          unsigned int cmd, void __user *arg)
{
      if (snd_BUG_ON(!substream))
            return -ENXIO;
      if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
            return -EINVAL;
      switch (cmd) {
      case SNDRV_PCM_IOCTL_READI_FRAMES:
      {
            struct snd_xferi xferi;
            struct snd_xferi __user *_xferi = arg;
            struct snd_pcm_runtime *runtime = substream->runtime;
            snd_pcm_sframes_t result;
            if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
                  return -EBADFD;
            if (put_user(0, &_xferi->result))
                  return -EFAULT;
            if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
                  return -EFAULT;
            result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
            __put_user(result, &_xferi->result);
            return result < 0 ? result : 0;
      }
      case SNDRV_PCM_IOCTL_READN_FRAMES:
      {
            struct snd_xfern xfern;
            struct snd_xfern __user *_xfern = arg;
            struct snd_pcm_runtime *runtime = substream->runtime;
            void *bufs;
            snd_pcm_sframes_t result;
            if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
                  return -EBADFD;
            if (runtime->channels > 128)
                  return -EINVAL;
            if (put_user(0, &_xfern->result))
                  return -EFAULT;
            if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
                  return -EFAULT;

            bufs = memdup_user(xfern.bufs,
                           sizeof(void *) * runtime->channels);
            if (IS_ERR(bufs))
                  return PTR_ERR(bufs);
            result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
            kfree(bufs);
            __put_user(result, &_xfern->result);
            return result < 0 ? result : 0;
      }
      case SNDRV_PCM_IOCTL_REWIND:
      {
            snd_pcm_uframes_t frames;
            snd_pcm_uframes_t __user *_frames = arg;
            snd_pcm_sframes_t result;
            if (get_user(frames, _frames))
                  return -EFAULT;
            if (put_user(0, _frames))
                  return -EFAULT;
            result = snd_pcm_capture_rewind(substream, frames);
            __put_user(result, _frames);
            return result < 0 ? result : 0;
      }
      case SNDRV_PCM_IOCTL_FORWARD:
      {
            snd_pcm_uframes_t frames;
            snd_pcm_uframes_t __user *_frames = arg;
            snd_pcm_sframes_t result;
            if (get_user(frames, _frames))
                  return -EFAULT;
            if (put_user(0, _frames))
                  return -EFAULT;
            result = snd_pcm_capture_forward(substream, frames);
            __put_user(result, _frames);
            return result < 0 ? result : 0;
      }
      }
      return snd_pcm_common_ioctl1(file, substream, cmd, arg);
}

static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
                           unsigned long arg)
{
      struct snd_pcm_file *pcm_file;

      pcm_file = file->private_data;

      if (((cmd >> 8) & 0xff) != 'A')
            return -ENOTTY;

      return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
                               (void __user *)arg);
}

static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
                          unsigned long arg)
{
      struct snd_pcm_file *pcm_file;

      pcm_file = file->private_data;

      if (((cmd >> 8) & 0xff) != 'A')
            return -ENOTTY;

      return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
                              (void __user *)arg);
}

int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
                   unsigned int cmd, void *arg)
{
      mm_segment_t fs;
      int result;
      
      fs = snd_enter_user();
      switch (substream->stream) {
      case SNDRV_PCM_STREAM_PLAYBACK:
            result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
                                     (void __user *)arg);
            break;
      case SNDRV_PCM_STREAM_CAPTURE:
            result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
                                    (void __user *)arg);
            break;
      default:
            result = -EINVAL;
            break;
      }
      snd_leave_user(fs);
      return result;
}

EXPORT_SYMBOL(snd_pcm_kernel_ioctl);

static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
                      loff_t * offset)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
      snd_pcm_sframes_t result;

      pcm_file = file->private_data;
      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;
      if (!frame_aligned(runtime, count))
            return -EINVAL;
      count = bytes_to_frames(runtime, count);
      result = snd_pcm_lib_read(substream, buf, count);
      if (result > 0)
            result = frames_to_bytes(runtime, result);
      return result;
}

static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
                       size_t count, loff_t * offset)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
      snd_pcm_sframes_t result;

      pcm_file = file->private_data;
      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;
      if (!frame_aligned(runtime, count))
            return -EINVAL;
      count = bytes_to_frames(runtime, count);
      result = snd_pcm_lib_write(substream, buf, count);
      if (result > 0)
            result = frames_to_bytes(runtime, result);
      return result;
}

static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
                       unsigned long nr_segs, loff_t pos)

{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
      snd_pcm_sframes_t result;
      unsigned long i;
      void __user **bufs;
      snd_pcm_uframes_t frames;

      pcm_file = iocb->ki_filp->private_data;
      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;
      if (nr_segs > 1024 || nr_segs != runtime->channels)
            return -EINVAL;
      if (!frame_aligned(runtime, iov->iov_len))
            return -EINVAL;
      frames = bytes_to_samples(runtime, iov->iov_len);
      bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
      if (bufs == NULL)
            return -ENOMEM;
      for (i = 0; i < nr_segs; ++i)
            bufs[i] = iov[i].iov_base;
      result = snd_pcm_lib_readv(substream, bufs, frames);
      if (result > 0)
            result = frames_to_bytes(runtime, result);
      kfree(bufs);
      return result;
}

static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
                        unsigned long nr_segs, loff_t pos)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
      snd_pcm_sframes_t result;
      unsigned long i;
      void __user **bufs;
      snd_pcm_uframes_t frames;

      pcm_file = iocb->ki_filp->private_data;
      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;
      if (nr_segs > 128 || nr_segs != runtime->channels ||
          !frame_aligned(runtime, iov->iov_len))
            return -EINVAL;
      frames = bytes_to_samples(runtime, iov->iov_len);
      bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
      if (bufs == NULL)
            return -ENOMEM;
      for (i = 0; i < nr_segs; ++i)
            bufs[i] = iov[i].iov_base;
      result = snd_pcm_lib_writev(substream, bufs, frames);
      if (result > 0)
            result = frames_to_bytes(runtime, result);
      kfree(bufs);
      return result;
}

static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
        unsigned int mask;
      snd_pcm_uframes_t avail;

      pcm_file = file->private_data;

      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;

      poll_wait(file, &runtime->sleep, wait);

      snd_pcm_stream_lock_irq(substream);
      avail = snd_pcm_playback_avail(runtime);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_RUNNING:
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_PAUSED:
            if (avail >= runtime->control->avail_min) {
                  mask = POLLOUT | POLLWRNORM;
                  break;
            }
            /* Fall through */
      case SNDRV_PCM_STATE_DRAINING:
            mask = 0;
            break;
      default:
            mask = POLLOUT | POLLWRNORM | POLLERR;
            break;
      }
      snd_pcm_stream_unlock_irq(substream);
      return mask;
}

static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
        unsigned int mask;
      snd_pcm_uframes_t avail;

      pcm_file = file->private_data;

      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;

      poll_wait(file, &runtime->sleep, wait);

      snd_pcm_stream_lock_irq(substream);
      avail = snd_pcm_capture_avail(runtime);
      switch (runtime->status->state) {
      case SNDRV_PCM_STATE_RUNNING:
      case SNDRV_PCM_STATE_PREPARED:
      case SNDRV_PCM_STATE_PAUSED:
            if (avail >= runtime->control->avail_min) {
                  mask = POLLIN | POLLRDNORM;
                  break;
            }
            mask = 0;
            break;
      case SNDRV_PCM_STATE_DRAINING:
            if (avail > 0) {
                  mask = POLLIN | POLLRDNORM;
                  break;
            }
            /* Fall through */
      default:
            mask = POLLIN | POLLRDNORM | POLLERR;
            break;
      }
      snd_pcm_stream_unlock_irq(substream);
      return mask;
}

/*
 * mmap support
 */

/*
 * Only on coherent architectures, we can mmap the status and the control records
 * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
 */
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
/*
 * mmap status record
 */
static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
                                    struct vm_fault *vmf)
{
      struct snd_pcm_substream *substream = area->vm_private_data;
      struct snd_pcm_runtime *runtime;
      
      if (substream == NULL)
            return VM_FAULT_SIGBUS;
      runtime = substream->runtime;
      vmf->page = virt_to_page(runtime->status);
      get_page(vmf->page);
      return 0;
}

static const struct vm_operations_struct snd_pcm_vm_ops_status =
{
      .fault =    snd_pcm_mmap_status_fault,
};

static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
                         struct vm_area_struct *area)
{
      struct snd_pcm_runtime *runtime;
      long size;
      if (!(area->vm_flags & VM_READ))
            return -EINVAL;
      runtime = substream->runtime;
      size = area->vm_end - area->vm_start;
      if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
            return -EINVAL;
      area->vm_ops = &snd_pcm_vm_ops_status;
      area->vm_private_data = substream;
      area->vm_flags |= VM_RESERVED;
      return 0;
}

/*
 * mmap control record
 */
static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
                                    struct vm_fault *vmf)
{
      struct snd_pcm_substream *substream = area->vm_private_data;
      struct snd_pcm_runtime *runtime;
      
      if (substream == NULL)
            return VM_FAULT_SIGBUS;
      runtime = substream->runtime;
      vmf->page = virt_to_page(runtime->control);
      get_page(vmf->page);
      return 0;
}

static const struct vm_operations_struct snd_pcm_vm_ops_control =
{
      .fault =    snd_pcm_mmap_control_fault,
};

static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
                        struct vm_area_struct *area)
{
      struct snd_pcm_runtime *runtime;
      long size;
      if (!(area->vm_flags & VM_READ))
            return -EINVAL;
      runtime = substream->runtime;
      size = area->vm_end - area->vm_start;
      if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
            return -EINVAL;
      area->vm_ops = &snd_pcm_vm_ops_control;
      area->vm_private_data = substream;
      area->vm_flags |= VM_RESERVED;
      return 0;
}
#else /* ! coherent mmap */
/*
 * don't support mmap for status and control records.
 */
static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
                         struct vm_area_struct *area)
{
      return -ENXIO;
}
static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
                        struct vm_area_struct *area)
{
      return -ENXIO;
}
#endif /* coherent mmap */

static inline struct page *
snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
{
      void *vaddr = substream->runtime->dma_area + ofs;
#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
      if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
            return virt_to_page(CAC_ADDR(vaddr));
#endif
#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
      if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
            dma_addr_t addr = substream->runtime->dma_addr + ofs;
            addr -= get_dma_offset(substream->dma_buffer.dev.dev);
            /* assume dma_handle set via pfn_to_phys() in
             * mm/dma-noncoherent.c
             */
            return pfn_to_page(addr >> PAGE_SHIFT);
      }
#endif
      return virt_to_page(vaddr);
}

/*
 * fault callback for mmapping a RAM page
 */
static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
                                    struct vm_fault *vmf)
{
      struct snd_pcm_substream *substream = area->vm_private_data;
      struct snd_pcm_runtime *runtime;
      unsigned long offset;
      struct page * page;
      size_t dma_bytes;
      
      if (substream == NULL)
            return VM_FAULT_SIGBUS;
      runtime = substream->runtime;
      offset = vmf->pgoff << PAGE_SHIFT;
      dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
      if (offset > dma_bytes - PAGE_SIZE)
            return VM_FAULT_SIGBUS;
      if (substream->ops->page)
            page = substream->ops->page(substream, offset);
      else
            page = snd_pcm_default_page_ops(substream, offset);
      if (!page)
            return VM_FAULT_SIGBUS;
      get_page(page);
      vmf->page = page;
      return 0;
}

static const struct vm_operations_struct snd_pcm_vm_ops_data = {
      .open =           snd_pcm_mmap_data_open,
      .close =    snd_pcm_mmap_data_close,
};

static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
      .open =           snd_pcm_mmap_data_open,
      .close =    snd_pcm_mmap_data_close,
      .fault =    snd_pcm_mmap_data_fault,
};

#ifndef ARCH_HAS_DMA_MMAP_COHERENT
/* This should be defined / handled globally! */
#ifdef CONFIG_ARM
#define ARCH_HAS_DMA_MMAP_COHERENT
#endif
#endif

/*
 * mmap the DMA buffer on RAM
 */
static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
                        struct vm_area_struct *area)
{
      area->vm_flags |= VM_RESERVED;
#ifdef ARCH_HAS_DMA_MMAP_COHERENT
      if (!substream->ops->page &&
          substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
            return dma_mmap_coherent(substream->dma_buffer.dev.dev,
                               area,
                               substream->runtime->dma_area,
                               substream->runtime->dma_addr,
                               area->vm_end - area->vm_start);
#elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
      if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV &&
          !plat_device_is_coherent(substream->dma_buffer.dev.dev))
            area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
      /* mmap with fault handler */
      area->vm_ops = &snd_pcm_vm_ops_data_fault;
      return 0;
}

/*
 * mmap the DMA buffer on I/O memory area
 */
#if SNDRV_PCM_INFO_MMAP_IOMEM
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
                     struct vm_area_struct *area)
{
      long size;
      unsigned long offset;

      area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
      area->vm_flags |= VM_IO;
      size = area->vm_end - area->vm_start;
      offset = area->vm_pgoff << PAGE_SHIFT;
      if (io_remap_pfn_range(area, area->vm_start,
                        (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
                        size, area->vm_page_prot))
            return -EAGAIN;
      return 0;
}

EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
#endif /* SNDRV_PCM_INFO_MMAP */

/* mmap callback with pgprot_noncached */
int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
                         struct vm_area_struct *area)
{
      area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
      return snd_pcm_default_mmap(substream, area);
}
EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);

/*
 * mmap DMA buffer
 */
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
                  struct vm_area_struct *area)
{
      struct snd_pcm_runtime *runtime;
      long size;
      unsigned long offset;
      size_t dma_bytes;
      int err;

      if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
            if (!(area->vm_flags & (VM_WRITE|VM_READ)))
                  return -EINVAL;
      } else {
            if (!(area->vm_flags & VM_READ))
                  return -EINVAL;
      }
      runtime = substream->runtime;
      if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
            return -EBADFD;
      if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
            return -ENXIO;
      if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
          runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
            return -EINVAL;
      size = area->vm_end - area->vm_start;
      offset = area->vm_pgoff << PAGE_SHIFT;
      dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
      if ((size_t)size > dma_bytes)
            return -EINVAL;
      if (offset > dma_bytes - size)
            return -EINVAL;

      area->vm_ops = &snd_pcm_vm_ops_data;
      area->vm_private_data = substream;
      if (substream->ops->mmap)
            err = substream->ops->mmap(substream, area);
      else
            err = snd_pcm_default_mmap(substream, area);
      if (!err)
            atomic_inc(&substream->mmap_count);
      return err;
}

EXPORT_SYMBOL(snd_pcm_mmap_data);

static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
{
      struct snd_pcm_file * pcm_file;
      struct snd_pcm_substream *substream;      
      unsigned long offset;
      
      pcm_file = file->private_data;
      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;

      offset = area->vm_pgoff << PAGE_SHIFT;
      switch (offset) {
      case SNDRV_PCM_MMAP_OFFSET_STATUS:
            if (pcm_file->no_compat_mmap)
                  return -ENXIO;
            return snd_pcm_mmap_status(substream, file, area);
      case SNDRV_PCM_MMAP_OFFSET_CONTROL:
            if (pcm_file->no_compat_mmap)
                  return -ENXIO;
            return snd_pcm_mmap_control(substream, file, area);
      default:
            return snd_pcm_mmap_data(substream, file, area);
      }
      return 0;
}

static int snd_pcm_fasync(int fd, struct file * file, int on)
{
      struct snd_pcm_file * pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;

      pcm_file = file->private_data;
      substream = pcm_file->substream;
      if (PCM_RUNTIME_CHECK(substream))
            return -ENXIO;
      runtime = substream->runtime;
      return fasync_helper(fd, file, on, &runtime->fasync);
}

/*
 * ioctl32 compat
 */
#ifdef CONFIG_COMPAT
#include "pcm_compat.c"
#else
#define snd_pcm_ioctl_compat  NULL
#endif

/*
 *  To be removed helpers to keep binary compatibility
 */

#ifdef CONFIG_SND_SUPPORT_OLD_API
#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))

static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
                                     struct snd_pcm_hw_params_old *oparams)
{
      unsigned int i;

      memset(params, 0, sizeof(*params));
      params->flags = oparams->flags;
      for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
            params->masks[i].bits[0] = oparams->masks[i];
      memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
      params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
      params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
      params->info = oparams->info;
      params->msbits = oparams->msbits;
      params->rate_num = oparams->rate_num;
      params->rate_den = oparams->rate_den;
      params->fifo_size = oparams->fifo_size;
}

static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
                                   struct snd_pcm_hw_params *params)
{
      unsigned int i;

      memset(oparams, 0, sizeof(*oparams));
      oparams->flags = params->flags;
      for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
            oparams->masks[i] = params->masks[i].bits[0];
      memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
      oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
      oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
      oparams->info = params->info;
      oparams->msbits = params->msbits;
      oparams->rate_num = params->rate_num;
      oparams->rate_den = params->rate_den;
      oparams->fifo_size = params->fifo_size;
}

static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
                              struct snd_pcm_hw_params_old __user * _oparams)
{
      struct snd_pcm_hw_params *params;
      struct snd_pcm_hw_params_old *oparams = NULL;
      int err;

      params = kmalloc(sizeof(*params), GFP_KERNEL);
      if (!params)
            return -ENOMEM;

      oparams = memdup_user(_oparams, sizeof(*oparams));
      if (IS_ERR(oparams)) {
            err = PTR_ERR(oparams);
            goto out;
      }
      snd_pcm_hw_convert_from_old_params(params, oparams);
      err = snd_pcm_hw_refine(substream, params);
      snd_pcm_hw_convert_to_old_params(oparams, params);
      if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
            if (!err)
                  err = -EFAULT;
      }

      kfree(oparams);
out:
      kfree(params);
      return err;
}

static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
                              struct snd_pcm_hw_params_old __user * _oparams)
{
      struct snd_pcm_hw_params *params;
      struct snd_pcm_hw_params_old *oparams = NULL;
      int err;

      params = kmalloc(sizeof(*params), GFP_KERNEL);
      if (!params)
            return -ENOMEM;

      oparams = memdup_user(_oparams, sizeof(*oparams));
      if (IS_ERR(oparams)) {
            err = PTR_ERR(oparams);
            goto out;
      }
      snd_pcm_hw_convert_from_old_params(params, oparams);
      err = snd_pcm_hw_params(substream, params);
      snd_pcm_hw_convert_to_old_params(oparams, params);
      if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
            if (!err)
                  err = -EFAULT;
      }

      kfree(oparams);
out:
      kfree(params);
      return err;
}
#endif /* CONFIG_SND_SUPPORT_OLD_API */

#ifndef CONFIG_MMU
static unsigned long snd_pcm_get_unmapped_area(struct file *file,
                                     unsigned long addr,
                                     unsigned long len,
                                     unsigned long pgoff,
                                     unsigned long flags)
{
      struct snd_pcm_file *pcm_file = file->private_data;
      struct snd_pcm_substream *substream = pcm_file->substream;
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned long offset = pgoff << PAGE_SHIFT;

      switch (offset) {
      case SNDRV_PCM_MMAP_OFFSET_STATUS:
            return (unsigned long)runtime->status;
      case SNDRV_PCM_MMAP_OFFSET_CONTROL:
            return (unsigned long)runtime->control;
      default:
            return (unsigned long)runtime->dma_area + offset;
      }
}
#else
# define snd_pcm_get_unmapped_area NULL
#endif

/*
 *  Register section
 */

const struct file_operations snd_pcm_f_ops[2] = {
      {
            .owner =          THIS_MODULE,
            .write =          snd_pcm_write,
            .aio_write =            snd_pcm_aio_write,
            .open =                 snd_pcm_playback_open,
            .release =        snd_pcm_release,
            .llseek =         no_llseek,
            .poll =                 snd_pcm_playback_poll,
            .unlocked_ioctl = snd_pcm_playback_ioctl,
            .compat_ioctl =   snd_pcm_ioctl_compat,
            .mmap =                 snd_pcm_mmap,
            .fasync =         snd_pcm_fasync,
            .get_unmapped_area =    snd_pcm_get_unmapped_area,
      },
      {
            .owner =          THIS_MODULE,
            .read =                 snd_pcm_read,
            .aio_read =       snd_pcm_aio_read,
            .open =                 snd_pcm_capture_open,
            .release =        snd_pcm_release,
            .llseek =         no_llseek,
            .poll =                 snd_pcm_capture_poll,
            .unlocked_ioctl = snd_pcm_capture_ioctl,
            .compat_ioctl =   snd_pcm_ioctl_compat,
            .mmap =                 snd_pcm_mmap,
            .fasync =         snd_pcm_fasync,
            .get_unmapped_area =    snd_pcm_get_unmapped_area,
      }
};

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