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Sourcecode: alsa-driver version File versions

init.c

/*
 *  Initialization routines
 *  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/init.h>
#include <linux/sched.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/ctype.h>
#include <linux/pm.h>

#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>

static DEFINE_SPINLOCK(shutdown_lock);
static LIST_HEAD(shutdown_files);

static const struct file_operations snd_shutdown_f_ops;

static unsigned int snd_cards_lock; /* locked for registering/using */
struct snd_card *snd_cards[SNDRV_CARDS];
EXPORT_SYMBOL(snd_cards);

static DEFINE_MUTEX(snd_card_mutex);

static char *slots[SNDRV_CARDS];
module_param_array(slots, charp, NULL, 0444);
MODULE_PARM_DESC(slots, "Module names assigned to the slots.");

/* return non-zero if the given index is reserved for the given
 * module via slots option
 */
static int module_slot_match(struct module *module, int idx)
{
      int match = 1;
#ifdef MODULE
      const char *s1, *s2;

      if (!module || !module->name || !slots[idx])
            return 0;

      s1 = module->name;
      s2 = slots[idx];
      if (*s2 == '!') {
            match = 0; /* negative match */
            s2++;
      }
      /* compare module name strings
       * hyphens are handled as equivalent with underscore
       */
      for (;;) {
            char c1 = *s1++;
            char c2 = *s2++;
            if (c1 == '-')
                  c1 = '_';
            if (c2 == '-')
                  c2 = '_';
            if (c1 != c2)
                  return !match;
            if (!c1)
                  break;
      }
#endif /* MODULE */
      return match;
}

#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
int (*snd_mixer_oss_notify_callback)(struct snd_card *card, int free_flag);
EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
#endif

#ifdef CONFIG_PROC_FS
static void snd_card_id_read(struct snd_info_entry *entry,
                       struct snd_info_buffer *buffer)
{
      snd_iprintf(buffer, "%s\n", entry->card->id);
}

static inline int init_info_for_card(struct snd_card *card)
{
      int err;
      struct snd_info_entry *entry;

      if ((err = snd_info_card_register(card)) < 0) {
            snd_printd("unable to create card info\n");
            return err;
      }
      if ((entry = snd_info_create_card_entry(card, "id", card->proc_root)) == NULL) {
            snd_printd("unable to create card entry\n");
            return err;
      }
      entry->c.text.read = snd_card_id_read;
      if (snd_info_register(entry) < 0) {
            snd_info_free_entry(entry);
            entry = NULL;
      }
      card->proc_id = entry;
      return 0;
}
#else /* !CONFIG_PROC_FS */
#define init_info_for_card(card)
#endif

/**
 *  snd_card_new - create and initialize a soundcard structure
 *  @idx: card index (address) [0 ... (SNDRV_CARDS-1)]
 *  @xid: card identification (ASCII string)
 *  @module: top level module for locking
 *  @extra_size: allocate this extra size after the main soundcard structure
 *
 *  Creates and initializes a soundcard structure.
 *
 *  Returns kmallocated snd_card structure. Creates the ALSA control interface
 *  (which is blocked until snd_card_register function is called).
 */
struct snd_card *snd_card_new(int idx, const char *xid,
                   struct module *module, int extra_size)
{
      struct snd_card *card;
      int err, idx2;

      if (extra_size < 0)
            extra_size = 0;
      card = kzalloc(sizeof(*card) + extra_size, GFP_KERNEL);
      if (card == NULL)
            return NULL;
      if (xid) {
            if (!snd_info_check_reserved_words(xid))
                  goto __error;
            strlcpy(card->id, xid, sizeof(card->id));
      }
      err = 0;
      mutex_lock(&snd_card_mutex);
      if (idx < 0) {
            for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
                  /* idx == -1 == 0xffff means: take any free slot */
                  if (~snd_cards_lock & idx & 1<<idx2) {
                        if (module_slot_match(module, idx2)) {
                              idx = idx2;
                              break;
                        }
                  }
      }
      if (idx < 0) {
            for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++)
                  /* idx == -1 == 0xffff means: take any free slot */
                  if (~snd_cards_lock & idx & 1<<idx2) {
                        if (!slots[idx2] || !*slots[idx2]) {
                              idx = idx2;
                              break;
                        }
                  }
      }
      if (idx < 0)
            err = -ENODEV;
      else if (idx < snd_ecards_limit) {
            if (snd_cards_lock & (1 << idx))
                  err = -EBUSY;     /* invalid */
      } else if (idx >= SNDRV_CARDS)
            err = -ENODEV;
      if (err < 0) {
            mutex_unlock(&snd_card_mutex);
            snd_printk(KERN_ERR "cannot find the slot for index %d (range 0-%i), error: %d\n",
                   idx, snd_ecards_limit - 1, err);
            goto __error;
      }
      snd_cards_lock |= 1 << idx;         /* lock it */
      if (idx >= snd_ecards_limit)
            snd_ecards_limit = idx + 1; /* increase the limit */
      mutex_unlock(&snd_card_mutex);
      card->number = idx;
      card->module = module;
      INIT_LIST_HEAD(&card->devices);
      init_rwsem(&card->controls_rwsem);
      rwlock_init(&card->ctl_files_rwlock);
      INIT_LIST_HEAD(&card->controls);
      INIT_LIST_HEAD(&card->ctl_files);
      spin_lock_init(&card->files_lock);
      init_waitqueue_head(&card->shutdown_sleep);
#ifdef CONFIG_PM
      mutex_init(&card->power_lock);
      init_waitqueue_head(&card->power_sleep);
#endif
      /* the control interface cannot be accessed from the user space until */
      /* snd_cards_bitmask and snd_cards are set with snd_card_register */
      if ((err = snd_ctl_create(card)) < 0) {
            snd_printd("unable to register control minors\n");
            goto __error;
      }
      if ((err = snd_info_card_create(card)) < 0) {
            snd_printd("unable to create card info\n");
            goto __error_ctl;
      }
      if (extra_size > 0)
            card->private_data = (char *)card + sizeof(struct snd_card);
      return card;

      __error_ctl:
      snd_device_free_all(card, SNDRV_DEV_CMD_PRE);
      __error:
      kfree(card);
            return NULL;
}

EXPORT_SYMBOL(snd_card_new);

/* return non-zero if a card is already locked */
int snd_card_locked(int card)
{
      int locked;

      mutex_lock(&snd_card_mutex);
      locked = snd_cards_lock & (1 << card);
      mutex_unlock(&snd_card_mutex);
      return locked;
}

static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
{
      return -ENODEV;
}

static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
                           size_t count, loff_t *offset)
{
      return -ENODEV;
}

static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
                            size_t count, loff_t *offset)
{
      return -ENODEV;
}

static int snd_disconnect_release(struct inode *inode, struct file *file)
{
      struct snd_monitor_file *df = NULL, *_df;

      spin_lock(&shutdown_lock);
      list_for_each_entry(_df, &shutdown_files, shutdown_list) {
            if (_df->file == file) {
                  df = _df;
                  break;
            }
      }
      spin_unlock(&shutdown_lock);

      if (likely(df))
            return df->disconnected_f_op->release(inode, file);

      panic("%s(%p, %p) failed!", __func__, inode, file);
}

static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
{
      return POLLERR | POLLNVAL;
}

static long snd_disconnect_ioctl(struct file *file,
                         unsigned int cmd, unsigned long arg)
{
      return -ENODEV;
}

static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
{
      return -ENODEV;
}

static int snd_disconnect_fasync(int fd, struct file *file, int on)
{
      return -ENODEV;
}

static const struct file_operations snd_shutdown_f_ops =
{
      .owner =    THIS_MODULE,
      .llseek =   snd_disconnect_llseek,
      .read =     snd_disconnect_read,
      .write =    snd_disconnect_write,
      .release =  snd_disconnect_release,
      .poll =           snd_disconnect_poll,
      .unlocked_ioctl = snd_disconnect_ioctl,
#ifdef CONFIG_COMPAT
      .compat_ioctl = snd_disconnect_ioctl,
#endif
      .mmap =           snd_disconnect_mmap,
      .fasync =   snd_disconnect_fasync
};

/**
 *  snd_card_disconnect - disconnect all APIs from the file-operations (user space)
 *  @card: soundcard structure
 *
 *  Disconnects all APIs from the file-operations (user space).
 *
 *  Returns zero, otherwise a negative error code.
 *
 *  Note: The current implementation replaces all active file->f_op with special
 *        dummy file operations (they do nothing except release).
 */
int snd_card_disconnect(struct snd_card *card)
{
      struct snd_monitor_file *mfile;
      struct file *file;
      int err;

      if (!card)
            return -EINVAL;

      spin_lock(&card->files_lock);
      if (card->shutdown) {
            spin_unlock(&card->files_lock);
            return 0;
      }
      card->shutdown = 1;
      spin_unlock(&card->files_lock);

      /* phase 1: disable fops (user space) operations for ALSA API */
      mutex_lock(&snd_card_mutex);
      snd_cards[card->number] = NULL;
      snd_cards_lock &= ~(1 << card->number);
      mutex_unlock(&snd_card_mutex);
      
      /* phase 2: replace file->f_op with special dummy operations */
      
      spin_lock(&card->files_lock);
      mfile = card->files;
      while (mfile) {
            file = mfile->file;

            /* it's critical part, use endless loop */
            /* we have no room to fail */
            mfile->disconnected_f_op = mfile->file->f_op;

            spin_lock(&shutdown_lock);
            list_add(&mfile->shutdown_list, &shutdown_files);
            spin_unlock(&shutdown_lock);

            mfile->file->f_op = &snd_shutdown_f_ops;
            fops_get(mfile->file->f_op);
            
            mfile = mfile->next;
      }
      spin_unlock(&card->files_lock);     

      /* phase 3: notify all connected devices about disconnection */
      /* at this point, they cannot respond to any calls except release() */

#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
      if (snd_mixer_oss_notify_callback)
            snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_DISCONNECT);
#endif

      /* notify all devices that we are disconnected */
      err = snd_device_disconnect_all(card);
      if (err < 0)
            snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);

      snd_info_card_disconnect(card);
#ifndef CONFIG_SYSFS_DEPRECATED
      if (card->card_dev) {
            device_unregister(card->card_dev);
            card->card_dev = NULL;
      }
#endif
#ifdef CONFIG_PM
      wake_up(&card->power_sleep);
#endif
      return 0;   
}

EXPORT_SYMBOL(snd_card_disconnect);

/**
 *  snd_card_free - frees given soundcard structure
 *  @card: soundcard structure
 *
 *  This function releases the soundcard structure and the all assigned
 *  devices automatically.  That is, you don't have to release the devices
 *  by yourself.
 *
 *  Returns zero. Frees all associated devices and frees the control
 *  interface associated to given soundcard.
 */
static int snd_card_do_free(struct snd_card *card)
{
#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
      if (snd_mixer_oss_notify_callback)
            snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_FREE);
#endif
      if (snd_device_free_all(card, SNDRV_DEV_CMD_PRE) < 0) {
            snd_printk(KERN_ERR "unable to free all devices (pre)\n");
            /* Fatal, but this situation should never occur */
      }
      if (snd_device_free_all(card, SNDRV_DEV_CMD_NORMAL) < 0) {
            snd_printk(KERN_ERR "unable to free all devices (normal)\n");
            /* Fatal, but this situation should never occur */
      }
      if (snd_device_free_all(card, SNDRV_DEV_CMD_POST) < 0) {
            snd_printk(KERN_ERR "unable to free all devices (post)\n");
            /* Fatal, but this situation should never occur */
      }
      if (card->private_free)
            card->private_free(card);
      snd_info_free_entry(card->proc_id);
      if (snd_info_card_free(card) < 0) {
            snd_printk(KERN_WARNING "unable to free card info\n");
            /* Not fatal error */
      }
      kfree(card);
      return 0;
}

int snd_card_free_when_closed(struct snd_card *card)
{
      int free_now = 0;
      int ret = snd_card_disconnect(card);
      if (ret)
            return ret;

      spin_lock(&card->files_lock);
      if (card->files == NULL)
            free_now = 1;
      else
            card->free_on_last_close = 1;
      spin_unlock(&card->files_lock);

      if (free_now)
            snd_card_do_free(card);
      return 0;
}

EXPORT_SYMBOL(snd_card_free_when_closed);

int snd_card_free(struct snd_card *card)
{
      int ret = snd_card_disconnect(card);
      if (ret)
            return ret;

      /* wait, until all devices are ready for the free operation */
      wait_event(card->shutdown_sleep, card->files == NULL);
      snd_card_do_free(card);
      return 0;
}

EXPORT_SYMBOL(snd_card_free);

static void choose_default_id(struct snd_card *card)
{
      int i, len, idx_flag = 0, loops = SNDRV_CARDS;
      char *id, *spos;
      
      id = spos = card->shortname;  
      while (*id != '\0') {
            if (*id == ' ')
                  spos = id + 1;
            id++;
      }
      id = card->id;
      while (*spos != '\0' && !isalnum(*spos))
            spos++;
      if (isdigit(*spos))
            *id++ = isalpha(card->shortname[0]) ? card->shortname[0] : 'D';
      while (*spos != '\0' && (size_t)(id - card->id) < sizeof(card->id) - 1) {
            if (isalnum(*spos))
                  *id++ = *spos;
            spos++;
      }
      *id = '\0';

      id = card->id;
      
      if (*id == '\0')
            strcpy(id, "default");

      while (1) {
                  if (loops-- == 0) {
                        snd_printk(KERN_ERR "unable to choose default card id (%s)\n", id);
                        strcpy(card->id, card->proc_root->name);
                        return;
                  }
                  if (!snd_info_check_reserved_words(id))
                        goto __change;
            for (i = 0; i < snd_ecards_limit; i++) {
                  if (snd_cards[i] && !strcmp(snd_cards[i]->id, id))
                        goto __change;
            }
            break;

            __change:
            len = strlen(id);
            if (idx_flag) {
                  if (id[len-1] != '9')
                        id[len-1]++;
                  else
                        id[len-1] = 'A';
            } else if ((size_t)len <= sizeof(card->id) - 3) {
                  strcat(id, "_1");
                  idx_flag++;
            } else {
                  spos = id + len - 2;
                  if ((size_t)len <= sizeof(card->id) - 2)
                        spos++;
                  *spos++ = '_';
                  *spos++ = '1';
                  *spos++ = '\0';
                  idx_flag++;
            }
      }
}

/**
 *  snd_card_register - register the soundcard
 *  @card: soundcard structure
 *
 *  This function registers all the devices assigned to the soundcard.
 *  Until calling this, the ALSA control interface is blocked from the
 *  external accesses.  Thus, you should call this function at the end
 *  of the initialization of the card.
 *
 *  Returns zero otherwise a negative error code if the registrain failed.
 */
int snd_card_register(struct snd_card *card)
{
      int err;

      snd_assert(card != NULL, return -EINVAL);
#ifndef CONFIG_SYSFS_DEPRECATED
      if (!card->card_dev) {
            card->card_dev = device_create(sound_class, card->dev, 0,
                                     "card%i", card->number);
            if (IS_ERR(card->card_dev))
                  card->card_dev = NULL;
      }
#endif
      if ((err = snd_device_register_all(card)) < 0)
            return err;
      mutex_lock(&snd_card_mutex);
      if (snd_cards[card->number]) {
            /* already registered */
            mutex_unlock(&snd_card_mutex);
            return 0;
      }
      if (card->id[0] == '\0')
            choose_default_id(card);
      snd_cards[card->number] = card;
      mutex_unlock(&snd_card_mutex);
      init_info_for_card(card);
#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
      if (snd_mixer_oss_notify_callback)
            snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
#endif
      return 0;
}

EXPORT_SYMBOL(snd_card_register);

#ifdef CONFIG_PROC_FS
static struct snd_info_entry *snd_card_info_entry;

static void snd_card_info_read(struct snd_info_entry *entry,
                         struct snd_info_buffer *buffer)
{
      int idx, count;
      struct snd_card *card;

      for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
            mutex_lock(&snd_card_mutex);
            if ((card = snd_cards[idx]) != NULL) {
                  count++;
                  snd_iprintf(buffer, "%2i [%-15s]: %s - %s\n",
                              idx,
                              card->id,
                              card->driver,
                              card->shortname);
                  snd_iprintf(buffer, "                      %s\n",
                              card->longname);
            }
            mutex_unlock(&snd_card_mutex);
      }
      if (!count)
            snd_iprintf(buffer, "--- no soundcards ---\n");
}

#ifdef CONFIG_SND_OSSEMUL

void snd_card_info_read_oss(struct snd_info_buffer *buffer)
{
      int idx, count;
      struct snd_card *card;

      for (idx = count = 0; idx < SNDRV_CARDS; idx++) {
            mutex_lock(&snd_card_mutex);
            if ((card = snd_cards[idx]) != NULL) {
                  count++;
                  snd_iprintf(buffer, "%s\n", card->longname);
            }
            mutex_unlock(&snd_card_mutex);
      }
      if (!count) {
            snd_iprintf(buffer, "--- no soundcards ---\n");
      }
}

#endif

#ifdef MODULE
static struct snd_info_entry *snd_card_module_info_entry;
static void snd_card_module_info_read(struct snd_info_entry *entry,
                              struct snd_info_buffer *buffer)
{
      int idx;
      struct snd_card *card;

      for (idx = 0; idx < SNDRV_CARDS; idx++) {
            mutex_lock(&snd_card_mutex);
            if ((card = snd_cards[idx]) != NULL)
                  snd_iprintf(buffer, "%2i %s\n",
                            idx, card->module->name);
            mutex_unlock(&snd_card_mutex);
      }
}
#endif

int __init snd_card_info_init(void)
{
      struct snd_info_entry *entry;

      entry = snd_info_create_module_entry(THIS_MODULE, "cards", NULL);
      if (! entry)
            return -ENOMEM;
      entry->c.text.read = snd_card_info_read;
      if (snd_info_register(entry) < 0) {
            snd_info_free_entry(entry);
            return -ENOMEM;
      }
      snd_card_info_entry = entry;

#ifdef MODULE
      entry = snd_info_create_module_entry(THIS_MODULE, "modules", NULL);
      if (entry) {
            entry->c.text.read = snd_card_module_info_read;
            if (snd_info_register(entry) < 0)
                  snd_info_free_entry(entry);
            else
                  snd_card_module_info_entry = entry;
      }
#endif

      return 0;
}

int __exit snd_card_info_done(void)
{
      snd_info_free_entry(snd_card_info_entry);
#ifdef MODULE
      snd_info_free_entry(snd_card_module_info_entry);
#endif
      return 0;
}

#endif /* CONFIG_PROC_FS */

/**
 *  snd_component_add - add a component string
 *  @card: soundcard structure
 *  @component: the component id string
 *
 *  This function adds the component id string to the supported list.
 *  The component can be referred from the alsa-lib.
 *
 *  Returns zero otherwise a negative error code.
 */
  
int snd_component_add(struct snd_card *card, const char *component)
{
      char *ptr;
      int len = strlen(component);

      ptr = strstr(card->components, component);
      if (ptr != NULL) {
            if (ptr[len] == '\0' || ptr[len] == ' ')  /* already there */
                  return 1;
      }
      if (strlen(card->components) + 1 + len + 1 > sizeof(card->components)) {
            snd_BUG();
            return -ENOMEM;
      }
      if (card->components[0] != '\0')
            strcat(card->components, " ");
      strcat(card->components, component);
      return 0;
}

EXPORT_SYMBOL(snd_component_add);

/**
 *  snd_card_file_add - add the file to the file list of the card
 *  @card: soundcard structure
 *  @file: file pointer
 *
 *  This function adds the file to the file linked-list of the card.
 *  This linked-list is used to keep tracking the connection state,
 *  and to avoid the release of busy resources by hotplug.
 *
 *  Returns zero or a negative error code.
 */
int snd_card_file_add(struct snd_card *card, struct file *file)
{
      struct snd_monitor_file *mfile;

      mfile = kmalloc(sizeof(*mfile), GFP_KERNEL);
      if (mfile == NULL)
            return -ENOMEM;
      mfile->file = file;
      mfile->disconnected_f_op = NULL;
      mfile->next = NULL;
      spin_lock(&card->files_lock);
      if (card->shutdown) {
            spin_unlock(&card->files_lock);
            kfree(mfile);
            return -ENODEV;
      }
      mfile->next = card->files;
      card->files = mfile;
      spin_unlock(&card->files_lock);
      return 0;
}

EXPORT_SYMBOL(snd_card_file_add);

/**
 *  snd_card_file_remove - remove the file from the file list
 *  @card: soundcard structure
 *  @file: file pointer
 *
 *  This function removes the file formerly added to the card via
 *  snd_card_file_add() function.
 *  If all files are removed and snd_card_free_when_closed() was
 *  called beforehand, it processes the pending release of
 *  resources.
 *
 *  Returns zero or a negative error code.
 */
int snd_card_file_remove(struct snd_card *card, struct file *file)
{
      struct snd_monitor_file *mfile, *pfile = NULL;
      int last_close = 0;

      spin_lock(&card->files_lock);
      mfile = card->files;
      while (mfile) {
            if (mfile->file == file) {
                  if (pfile)
                        pfile->next = mfile->next;
                  else
                        card->files = mfile->next;
                  break;
            }
            pfile = mfile;
            mfile = mfile->next;
      }
      if (mfile && mfile->disconnected_f_op) {
            fops_put(mfile->disconnected_f_op);
            spin_lock(&shutdown_lock);
            list_del(&mfile->shutdown_list);
            spin_unlock(&shutdown_lock);
      }
      if (card->files == NULL)
            last_close = 1;
      spin_unlock(&card->files_lock);
      if (last_close) {
            wake_up(&card->shutdown_sleep);
            if (card->free_on_last_close)
                  snd_card_do_free(card);
      }
      if (!mfile) {
            snd_printk(KERN_ERR "ALSA card file remove problem (%p)\n", file);
            return -ENOENT;
      }
      kfree(mfile);
      return 0;
}

EXPORT_SYMBOL(snd_card_file_remove);

#ifdef CONFIG_PM
/**
 *  snd_power_wait - wait until the power-state is changed.
 *  @card: soundcard structure
 *  @power_state: expected power state
 *
 *  Waits until the power-state is changed.
 *
 *  Note: the power lock must be active before call.
 */
int snd_power_wait(struct snd_card *card, unsigned int power_state)
{
      wait_queue_t wait;
      int result = 0;

      /* fastpath */
      if (snd_power_get_state(card) == power_state)
            return 0;
      init_waitqueue_entry(&wait, current);
      add_wait_queue(&card->power_sleep, &wait);
      while (1) {
            if (card->shutdown) {
                  result = -ENODEV;
                  break;
            }
            if (snd_power_get_state(card) == power_state)
                  break;
            set_current_state(TASK_UNINTERRUPTIBLE);
            snd_power_unlock(card);
            schedule_timeout(30 * HZ);
            snd_power_lock(card);
      }
      remove_wait_queue(&card->power_sleep, &wait);
      return result;
}

EXPORT_SYMBOL(snd_power_wait);
#endif /* CONFIG_PM */

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