Function audio_register

audio/audio.c:1734–1867

 ****************************************************************************/

int audio_register(FAR const char *name, FAR struct audio_lowerhalf_s *dev)
{
  FAR struct audio_upperhalf_s *upper;
  char path[AUDIO_MAX_DEVICE_PATH];
  static bool dev_audio_created = false;
#ifndef CONFIG_AUDIO_CUSTOM_DEV_PATH
  FAR const char *devname = "/dev/audio";
#elif !defined(CONFIG_AUDIO_DEV_ROOT)
  FAR const char *devname = CONFIG_AUDIO_DEV_PATH;
  FAR const char *ptr;
  FAR char *pathptr;
#endif

  /* Allocate the upper-half data structure */

  upper = kmm_zalloc(sizeof(struct audio_upperhalf_s));
  if (!upper)
    {
      auderr("ERROR: Allocation failed\n");
      return -ENOMEM;
    }

  /* Initialize the Audio device structure
   * (it was already zeroed by kmm_zalloc())
   */

  nxmutex_init(&upper->lock);
  spin_lock_init(&upper->spinlock);
  upper->dev = dev;

#ifdef CONFIG_AUDIO_CUSTOM_DEV_PATH

#ifdef CONFIG_AUDIO_DEV_ROOT

  /* This is the simple case ... No need to make a directory */

  strlcpy(path, "/dev/", sizeof(path));
  strlcat(path, name, sizeof(path));

#else
  /* Ensure the path begins with "/dev" as we don't support placing device
   * anywhere but in the /dev directory
   */

  DEBUGASSERT(strncmp(devname, "/dev", 4) == 0);

  /* Create a /dev/audio directory. */

  if (!dev_audio_created)
    {
      /* Get path name after "/dev" */

      ptr = &devname[4];
      if (*ptr == '/')
        {
          ptr++;
        }