int i2schar_devinit(void)
{
static bool initialized;
struct i2s_dev_s *i2s;
int ret;
/* Have we already initialized? */
if (!initialized) {
/* Call s5j_i2s_initialize() to get an instance of the I2S interface */
i2s = s5j_i2s_initialize(0);
if (!i2s) {
auddbg("ERROR: Failed to get the S5J I2S driver\n");
return -ENODEV;
}
/* Register the I2S character driver at "/dev/i2schar0" */
ret = i2schar_register(i2s, CONFIG_S5JT200_I2SCHAR_MINOR);
if (ret < 0) {
auddbg("ERROR: i2schar_register failed: %d\n", ret);
return ret;
}
I2S_ERR_CB_REG(i2s, err_cb, "Error_Test_String");
/* Now we are initialized */
initialized = true;
}
return OK;
}
static void audio_callback(FAR void *handle, uint16_t reason,
FAR struct ap_buffer_s *apb, uint16_t status)
{
FAR struct audio_upperhalf_s *upper = (FAR struct audio_upperhalf_s *)handle;
audllvdbg("Entry\n");
/* Perform operation based on reason code */
switch (reason)
{
case AUDIO_CALLBACK_DEQUEUE:
{
/* Call the dequeue routine */
audio_dequeuebuffer(upper, apb, status);
break;
}
case AUDIO_CALLBACK_IOERR:
{
}
break;
default:
{
auddbg("Unknown callback reason code %d\n", reason);
break;
}
}
}
static void audio_callback(FAR void *handle, uint16_t reason,
FAR struct ap_buffer_s *apb, uint16_t status)
#endif
{
FAR struct audio_upperhalf_s *upper = (FAR struct audio_upperhalf_s *)handle;
audllvdbg("Entry\n");
/* Perform operation based on reason code */
switch (reason)
{
case AUDIO_CALLBACK_DEQUEUE:
{
/* Call the dequeue routine */
#ifdef CONFIG_AUDIO_MULTI_SESSION
audio_dequeuebuffer(upper, apb, status, session);
#else
audio_dequeuebuffer(upper, apb, status);
#endif
break;
}
/* Lower-half I/O error occurred */
case AUDIO_CALLBACK_IOERR:
{
}
break;
/* Lower-half driver has completed a playback */
case AUDIO_CALLBACK_COMPLETE:
{
/* Send a complete message to the user if a message queue is registered */
#ifdef CONFIG_AUDIO_MULTI_SESSION
audio_complete(upper, apb, status, session);
#else
audio_complete(upper, apb, status);
#endif
}
break;
default:
{
auddbg("Unknown callback reason code %d\n", reason);
break;
}
}
}
void apb_free(FAR struct ap_buffer_s *apb)
{
int refcount;
/* Perform a reference count decrement and possibly release the memory */
apb_semtake(apb);
refcount = apb->crefs--;
apb_semgive(apb);
if (refcount == 1)
{
auddbg("Freeing %p\n", apb);
kufree(apb);
}
}
int sam_audio_null_initialize(int minor)
{
FAR struct audio_lowerhalf_s *nullaudio;
FAR struct audio_lowerhalf_s *pcm;
static bool initialized = false;
char devname[12];
int ret;
auddbg("minor %d\n", minor);
DEBUGASSERT(minor >= 0 && minor <= 25);
/* Have we already initialized? Since we never uninitialize we must prevent
* multiple initializations. This is necessary, for example, when the
* touchscreen example is used as a built-in application in NSH and can be
* called numerous time. It will attempt to initialize each time.
*/
if (!initialized)
{
/* Get a null audio interface
*/
nullaudio = audio_null_initialize();
if (!nullaudio)
{
auddbg("Failed to get the NULL audio interface\n");
ret = -ENODEV;
goto errout;
}
/* No we can embed the null audio interface into a PCM decoder
* instance so that we will have a PCM front end for the NULL
* audio driver.
*/
pcm = pcm_decode_initialize(nullaudio);
if (!pcm)
{
auddbg("ERROR: Failed create the PCM decoder\n");
ret = -ENODEV;
goto errout_with_nullaudio;
}
/* Create a device name */
snprintf(devname, 12, "pcm%d", minor);
/* Finally, we can register the PCM/NULL audio device. */
ret = audio_register(devname, pcm);
if (ret < 0)
{
auddbg("ERROR: Failed to register /dev/%s device: %d\n", devname, ret);
goto errout_with_pcm;
}
/* Now we are initialized */
initialized = true;
}
return OK;
/* Error exits. Unfortunately there is no mechanism in place now to
* recover resources from most errors on initialization failures.
*/
errout_with_nullaudio:
errout_with_pcm:
errout:
return ret;
}
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
const char* devname = "/dev/audio";
#elif !defined(CONFIG_AUDIO_DEV_ROOT)
const char* devname = CONFIG_AUDIO_DEV_PATH;
const char* ptr;
char* pathptr;
#endif
/* Allocate the upper-half data structure */
upper = (FAR struct audio_upperhalf_s *)kzalloc(sizeof(struct audio_upperhalf_s));
if (!upper)
{
auddbg("Allocation failed\n");
return -ENOMEM;
}
/* Initialize the Audio device structure (it was already zeroed by kzalloc()) */
sem_init(&upper->exclsem, 0, 1);
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 */
strcpy(path, "/dev/");
strcat(path, name);
#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++;
}
strcpy(path, "/dev/");
pathptr = &path[5];
/* Do mkdir for each segment of the path */
while (*ptr != '\0')
{
/* Build next path segment into path variable */
while (*ptr != '/' && *ptr != '\0')
{
*pathptr++ = *ptr++;
}
*pathptr = '\0';
/* Make this level of directory */
mkdir(path, 0644);
/* Check for another level */
*pathptr++ = '/';
if (*ptr == '/')
{
ptr++;
}
}
/* Indicate we have created the audio dev path */
dev_audio_created = true;
}
/* Now build the path for registration */
strcpy(path, devname);
if (devname[sizeof(devname)-1] != '/')
{
strcat(path, "/");
}
strcat(path, name);
#endif /* CONFIG_AUDIO_DEV_PATH=="/dev" */
#else /* CONFIG_AUDIO_CUSTOM_DEV_PATH */
/* Create a /dev/audio directory. */
if (!dev_audio_created)
{
/* We don't check for error here because even if it fails, then
* the register_driver call below will return an error condition
* for us.
*/
mkdir(devname, 0644);
dev_audio_created = true;
}
/* Register the Audio device */
memset(path, 0, AUDIO_MAX_DEVICE_PATH);
strcpy(path, devname);
strcat(path, "/");
strncat(path, name, AUDIO_MAX_DEVICE_PATH - 11);
#endif
audvdbg("Registering %s\n", path);
return register_driver(path, &g_audioops, 0666, upper);
}