/****************************************************************************
* drivers/audio/cs4344.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <fixedmath.h>
#include <queue.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/mqueue.h>
#include <nuttx/clock.h>
#include <nuttx/wqueue.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/audio/i2s.h>
#include <nuttx/audio/audio.h>
#include <nuttx/audio/cs4344.h>
#include <nuttx/lib/math.h>
#include "cs4344.h"
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int cs4344_takesem(FAR sem_t *sem);
static int cs4344_forcetake(FAR sem_t *sem);
#define cs4344_givesem(s) nxsem_post(s)
static void cs4344_setdatawidth(FAR struct cs4344_dev_s *priv);
static void cs4344_setbitrate(FAR struct cs4344_dev_s *priv);
/* Audio lower half methods (and close friends) */
static int cs4344_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session,
FAR const struct audio_caps_s *caps);
#else
static int cs4344_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps);
#endif
static int cs4344_shutdown(FAR struct audio_lowerhalf_s *dev);
static void cs4344_senddone(FAR struct i2s_dev_s *i2s,
FAR struct ap_buffer_s *apb, FAR void *arg,
int result);
static void cs4344_returnbuffers(FAR struct cs4344_dev_s *priv);
static int cs4344_sendbuffer(FAR struct cs4344_dev_s *priv);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int cs4344_start(FAR struct audio_lowerhalf_s *dev);
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_stop(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int cs4344_stop(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_pause(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
static int cs4344_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int cs4344_pause(FAR struct audio_lowerhalf_s *dev);
static int cs4344_resume(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
static int cs4344_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int cs4344_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int cs4344_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session);
#else
static int cs4344_reserve(FAR struct audio_lowerhalf_s *dev);
#endif
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int cs4344_release(FAR struct audio_lowerhalf_s *dev);
#endif
static void *cs4344_workerthread(pthread_addr_t pvarg);
/* Initialization */
static void cs4344_reset(FAR struct cs4344_dev_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct audio_ops_s g_audioops =
{
cs4344_getcaps, /* getcaps */
cs4344_configure, /* configure */
cs4344_shutdown, /* shutdown */
cs4344_start, /* start */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
cs4344_stop, /* stop */
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
cs4344_pause, /* pause */
cs4344_resume, /* resume */
#endif
NULL, /* allocbuffer */
NULL, /* freebuffer */
cs4344_enqueuebuffer, /* enqueue_buffer */
cs4344_cancelbuffer, /* cancel_buffer */
cs4344_ioctl, /* ioctl */
NULL, /* read */
NULL, /* write */
cs4344_reserve, /* reserve */
cs4344_release /* release */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: cs4344_takesem
*
* Description:
* Take a semaphore count, handling the nasty EINTR return if we are
* interrupted by a signal.
*
****************************************************************************/
static int cs4344_takesem(FAR sem_t *sem)
{
return nxsem_wait_uninterruptible(sem);
}
/****************************************************************************
* Name: cs4344_forcetake
*
* Description:
* This is just another wrapper but this one continues even if the thread
* is canceled. This must be done in certain conditions where were must
* continue in order to clean-up resources.
*
****************************************************************************/
static int cs4344_forcetake(FAR sem_t *sem)
{
int result;
int ret = OK;
do
{
result = nxsem_wait_uninterruptible(sem);
/* The only expected error would -ECANCELED meaning that the
* parent thread has been canceled. We have to continue and
* terminate the poll in this case.
*/
DEBUGASSERT(result == OK || result == -ECANCELED);
if (ret == OK && result < 0)
{
/* Remember the first failure */
ret = result;
}
}
while (result < 0);
return ret;
}
/****************************************************************************
* Name: cs4344_setdatawidth
*
* Description:
* Set the 8- or 16-bit data modes
*
****************************************************************************/
static void cs4344_setdatawidth(FAR struct cs4344_dev_s *priv)
{
if (priv->bpsamp == 16)
{
/* Reset default default setting */
priv->i2s->ops->i2s_txdatawidth(priv->i2s, 16);
}
else
{
/* This should select 8-bit with no companding */
priv->i2s->ops->i2s_txdatawidth(priv->i2s, 8);
}
}
/****************************************************************************
* Name: cs4344_setbitrate
*
****************************************************************************/
static void cs4344_setbitrate(FAR struct cs4344_dev_s *priv)
{
DEBUGASSERT(priv);
priv->i2s->ops->i2s_txsamplerate(priv->i2s, priv->samprate);
audinfo("sample rate=%u nchannels=%u bpsamp=%u\n",
priv->samprate, priv->nchannels, priv->bpsamp);
}
/****************************************************************************
* Name: cs4344_getcaps
*
* Description:
* Get the audio device capabilities
*
****************************************************************************/
static int cs4344_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps)
{
/* Validate the structure */
DEBUGASSERT(caps && caps->ac_len >= sizeof(struct audio_caps_s));
audinfo("type=%d ac_type=%d\n", type, caps->ac_type);
/* Fill in the caller's structure based on requested info */
caps->ac_format.hw = 0;
caps->ac_controls.w = 0;
switch (caps->ac_type)
{
/* Caller is querying for the types of units we support */
case AUDIO_TYPE_QUERY:
/* Provide our overall capabilities. The interfacing software
* must then call us back for specific info for each capability.
*/
caps->ac_channels = 2; /* Stereo output */
switch (caps->ac_subtype)
{
case AUDIO_TYPE_QUERY:
/* We don't decode any formats! Only something above us in
* the audio stream can perform decoding on our behalf.
*/
/* The types of audio units we implement */
caps->ac_controls.b[0] =
AUDIO_TYPE_OUTPUT | AUDIO_TYPE_FEATURE |
AUDIO_TYPE_PROCESSING;
break;
case AUDIO_FMT_MIDI:
/* We only support Format 0 */
caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
break;
default:
caps->ac_controls.b[0] = AUDIO_SUBFMT_END;
break;
}
break;
/* Provide capabilities of our OUTPUT unit */
case AUDIO_TYPE_OUTPUT:
caps->ac_channels = 2;
switch (caps->ac_subtype)
{
case AUDIO_TYPE_QUERY:
/* Report the Sample rates we support */
caps->ac_controls.b[0] =
AUDIO_SAMP_RATE_8K | AUDIO_SAMP_RATE_11K |
AUDIO_SAMP_RATE_16K | AUDIO_SAMP_RATE_22K |
AUDIO_SAMP_RATE_32K | AUDIO_SAMP_RATE_44K |
AUDIO_SAMP_RATE_48K;
break;
case AUDIO_FMT_MP3:
case AUDIO_FMT_WMA:
case AUDIO_FMT_PCM:
break;
default:
break;
}
break;
/* Provide capabilities of our FEATURE units */
case AUDIO_TYPE_FEATURE:
/* If the sub-type is UNDEF, then report the Feature Units we
* support.
*/
if (caps->ac_subtype == AUDIO_FU_UNDEF)
{
/* Fill in the ac_controls section with the Feature Units we
* have.
*/
caps->ac_controls.b[0] = AUDIO_FU_VOLUME | AUDIO_FU_BASS |
AUDIO_FU_TREBLE;
caps->ac_controls.b[1] = AUDIO_FU_BALANCE >> 8;
}
else
{
/* TODO: Do we need to provide specific info for the Feature
* Units, such as volume setting ranges, etc.?
*/
}
break;
/* Provide capabilities of our PROCESSING unit */
case AUDIO_TYPE_PROCESSING:
switch (caps->ac_subtype)
{
case AUDIO_PU_UNDEF:
/* Provide the type of Processing Units we support */
caps->ac_controls.b[0] = AUDIO_PU_STEREO_EXTENDER;
break;
case AUDIO_PU_STEREO_EXTENDER:
/* Provide capabilities of our Stereo Extender */
caps->ac_controls.b[0] =
AUDIO_STEXT_ENABLE | AUDIO_STEXT_WIDTH;
break;
default:
/* Other types of processing uint we don't support */
break;
}
break;
/* All others we don't support */
default:
/* Zero out the fields to indicate no support */
caps->ac_subtype = 0;
caps->ac_channels = 0;
break;
}
/* Return the length of the audio_caps_s struct for validation of
* proper Audio device type.
*/
return caps->ac_len;
}
/****************************************************************************
* Name: cs4344_configure
*
* Description:
* Configure the audio device for the specified mode of operation.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int
cs4344_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session, FAR const struct audio_caps_s *caps)
#else
static int
cs4344_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps)
#endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
int ret = OK;
DEBUGASSERT(priv != NULL && caps != NULL);
audinfo("ac_type: %d\n", caps->ac_type);
/* Process the configure operation */
switch (caps->ac_type)
{
case AUDIO_TYPE_FEATURE:
audinfo(" AUDIO_TYPE_FEATURE\n");
/* Process based on Feature Unit */
switch (caps->ac_format.hw)
{
default:
auderr(" ERROR: Unrecognized feature unit\n");
ret = -ENOTTY;
break;
}
break;
case AUDIO_TYPE_OUTPUT:
{
audinfo(" AUDIO_TYPE_OUTPUT:\n");
audinfo(" Number of channels: %u\n", caps->ac_channels);
audinfo(" Sample rate: %u\n", caps->ac_controls.hw[0]);
audinfo(" Sample width: %u\n", caps->ac_controls.b[2]);
/* Verify that all of the requested values are supported */
ret = -ERANGE;
if (caps->ac_channels != 1 && caps->ac_channels != 2)
{
auderr("ERROR: Unsupported number of channels: %d\n",
caps->ac_channels);
break;
}
if (caps->ac_controls.b[2] != 8 && caps->ac_controls.b[2] != 16)
{
auderr("ERROR: Unsupported bits per sample: %d\n",
caps->ac_controls.b[2]);
break;
}
/* Save the current stream configuration */
priv->samprate = caps->ac_controls.hw[0];
priv->nchannels = caps->ac_channels;
priv->bpsamp = caps->ac_controls.b[2];
/* Reconfigure the FLL to support the resulting number or channels,
* bits per sample, and bitrate.
*/
cs4344_setdatawidth(priv);
cs4344_setbitrate(priv);
ret = OK;
}
break;
case AUDIO_TYPE_PROCESSING:
break;
}
return ret;
}
/****************************************************************************
* Name: cs4344_shutdown
*
* Description:
* Shutdown the CS4344 chip and put it in the lowest power state possible.
*
****************************************************************************/
static int cs4344_shutdown(FAR struct audio_lowerhalf_s *dev)
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
DEBUGASSERT(priv);
/* Now issue a software reset. This puts all CS4344 registers back in
* their default state.
*/
cs4344_reset(priv);
return OK;
}
/****************************************************************************
* Name: cs4344_senddone
*
* Description:
* This is the I2S callback function that is invoked when the transfer
* completes.
*
****************************************************************************/
static void
cs4344_senddone(FAR struct i2s_dev_s *i2s,
FAR struct ap_buffer_s *apb, FAR void *arg, int result)
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)arg;
struct audio_msg_s msg;
irqstate_t flags;
int ret;
DEBUGASSERT(i2s && priv && priv->running && apb);
audinfo("apb=%p inflight=%d result=%d\n", apb, priv->inflight, result);
/* We do not place any restriction on the context in which this function
* is called. It may be called from an interrupt handler. Therefore, the
* doneq and in-flight values might be accessed from the interrupt level.
* Not the best design. But we will use interrupt controls to protect
* against that possibility.
*/
flags = enter_critical_section();
/* Add the completed buffer to the end of our doneq. We do not yet
* decrement the reference count.
*/
dq_addlast((FAR dq_entry_t *)apb, &priv->doneq);
/* And decrement the number of buffers in-flight */
DEBUGASSERT(priv->inflight > 0);
priv->inflight--;
/* Save the result of the transfer */
/* REVISIT: This can be overwritten */
priv->result = result;
leave_critical_section(flags);
/* Now send a message to the worker thread, informing it that there are
* buffers in the done queue that need to be cleaned up.
*/
msg.msg_id = AUDIO_MSG_COMPLETE;
ret = nxmq_send(priv->mq, (FAR const char *)&msg, sizeof(msg),
CONFIG_CS4344_MSG_PRIO);
if (ret < 0)
{
auderr("ERROR: nxmq_send failed: %d\n", ret);
}
}
/****************************************************************************
* Name: cs4344_returnbuffers
*
* Description:
* This function is called after the complete of one or more data
* transfers. This function will empty the done queue and release our
* reference to each buffer.
*
****************************************************************************/
static void cs4344_returnbuffers(FAR struct cs4344_dev_s *priv)
{
FAR struct ap_buffer_s *apb;
irqstate_t flags;
/* The doneq and in-flight values might be accessed from the interrupt
* level in some implementations. Not the best design. But we will
* use interrupt controls to protect against that possibility.
*/
flags = enter_critical_section();
while (dq_peek(&priv->doneq) != NULL)
{
/* Take the next buffer from the queue of completed transfers */
apb = (FAR struct ap_buffer_s *)dq_remfirst(&priv->doneq);
leave_critical_section(flags);
audinfo("Returning: apb=%p curbyte=%d nbytes=%d flags=%04x\n",
apb, apb->curbyte, apb->nbytes, apb->flags);
/* Are we returning the final buffer in the stream? */
if ((apb->flags & AUDIO_APB_FINAL) != 0)
{
/* Both the pending and the done queues should be empty and there
* should be no buffers in-flight.
*/
DEBUGASSERT(dq_empty(&priv->doneq) && dq_empty(&priv->pendq) &&
priv->inflight == 0);
/* Set the terminating flag. This will, eventually, cause the
* worker thread to exit (if it is not already terminating).
*/
audinfo("Terminating\n");
priv->terminating = true;
}
/* Release our reference to the audio buffer */
apb_free(apb);
/* Send the buffer back up to the previous level. */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK);
#endif
flags = enter_critical_section();
}
leave_critical_section(flags);
}
/****************************************************************************
* Name: cs4344_sendbuffer
*
* Description:
* Start the transfer an audio buffer to the CS4344 via I2S. This
* will not wait for the transfer to complete but will return immediately.
* the wmd8904_senddone called will be invoked when the transfer
* completes, stimulating the worker thread to call this function again.
*
****************************************************************************/
static int cs4344_sendbuffer(FAR struct cs4344_dev_s *priv)
{
FAR struct ap_buffer_s *apb;
irqstate_t flags;
uint32_t timeout;
int shift;
int ret;
/* Loop while there are audio buffers to be sent and we have few than
* CONFIG_CS4344_INFLIGHT then "in-flight"
*
* The 'inflight' value might be modified from the interrupt level in some
* implementations. We will use interrupt controls to protect against
* that possibility.
*
* The 'pendq', on the other hand, is protected via a semaphore. Let's
* hold the semaphore while we are busy here and disable the interrupts
* only while accessing 'inflight'.
*/
ret = cs4344_takesem(&priv->pendsem);
if (ret < 0)
{
return ret;
}
while (priv->inflight < CONFIG_CS4344_INFLIGHT &&
dq_peek(&priv->pendq) != NULL && !priv->paused)
{
/* Take next buffer from the queue of pending transfers */
apb = (FAR struct ap_buffer_s *)dq_remfirst(&priv->pendq);
audinfo("Sending apb=%p, size=%d inflight=%d\n",
apb, apb->nbytes, priv->inflight);
/* Increment the number of buffers in-flight before sending in order
* to avoid a possible race condition.
*/
flags = enter_critical_section();
priv->inflight++;
leave_critical_section(flags);
/* Send the entire audio buffer via I2S. What is a reasonable timeout
* to use? This would depend on the bit rate and size of the buffer.
*
* Samples in the buffer (samples):
* = buffer_size * 8 / bpsamp samples
* Sample rate (samples/second):
* = samplerate * nchannels
* Expected transfer time (seconds):
* = (buffer_size * 8) / bpsamp / samplerate / nchannels
*
* We will set the timeout about twice that.
*
* NOTES:
* - The multiplier of 8 becomes 16000 for 2x and units of
* milliseconds.
* - 16000 is a approximately 16384 (1 << 14), bpsamp is either
* (1 << 3) or (1 << 4), and nchannels is either (1 << 0) or
* (1 << 1). So this can be simplifies to (milliseconds):
*
* = (buffer_size << shift) / samplerate
*/
shift = (priv->bpsamp == 8) ? 14 - 3 : 14 - 4;
shift -= (priv->nchannels > 1) ? 1 : 0;
timeout = MSEC2TICK(((uint32_t)(apb->nbytes - apb->curbyte) << shift) /
(uint32_t)priv->samprate);
ret = I2S_SEND(priv->i2s, apb, cs4344_senddone, priv, timeout);
if (ret < 0)
{
auderr("ERROR: I2S_SEND failed: %d\n", ret);
break;
}
}
cs4344_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: cs4344_start
*
* Description:
* Start the configured operation (audio streaming, volume enabled, etc.).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int cs4344_start(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
struct sched_param sparam;
struct mq_attr attr;
pthread_attr_t tattr;
FAR void *value;
int ret;
audinfo("Entry\n");
/* Create a message queue for the worker thread */
snprintf(priv->mqname, sizeof(priv->mqname), "/tmp/%" PRIXPTR,
(uintptr_t)priv);
attr.mq_maxmsg = 16;
attr.mq_msgsize = sizeof(struct audio_msg_s);
attr.mq_curmsgs = 0;
attr.mq_flags = 0;
priv->mq = mq_open(priv->mqname, O_RDWR | O_CREAT, 0644, &attr);
if (priv->mq == NULL)
{
/* Error creating message queue! */
auderr("ERROR: Couldn't allocate message queue\n");
return -ENOMEM;
}
/* Join any old worker thread we had created to prevent a memory leak */
if (priv->threadid != 0)
{
audinfo("Joining old thread\n");
pthread_join(priv->threadid, &value);
}
/* Start our thread for sending data to the device */
pthread_attr_init(&tattr);
sparam.sched_priority = sched_get_priority_max(SCHED_FIFO) - 3;
pthread_attr_setschedparam(&tattr, &sparam);
pthread_attr_setstacksize(&tattr, CONFIG_CS4344_WORKER_STACKSIZE);
audinfo("Starting worker thread\n");
ret = pthread_create(&priv->threadid, &tattr, cs4344_workerthread,
(pthread_addr_t)priv);
if (ret != OK)
{
auderr("ERROR: pthread_create failed: %d\n", ret);
}
else
{
pthread_setname_np(priv->threadid, "cs4344");
audinfo("Created worker thread\n");
}
return ret;
}
/****************************************************************************
* Name: cs4344_stop
*
* Description:
* Stop the configured operation (audio streaming, volume disabled, etc.).
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
# ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_stop(FAR struct audio_lowerhalf_s *dev, FAR void *session)
# else
static int cs4344_stop(FAR struct audio_lowerhalf_s *dev)
# endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
struct audio_msg_s term_msg;
FAR void *value;
/* Send a message to stop all audio streaming */
term_msg.msg_id = AUDIO_MSG_STOP;
term_msg.u.data = 0;
nxmq_send(priv->mq, (FAR const char *)&term_msg, sizeof(term_msg),
CONFIG_CS4344_MSG_PRIO);
/* Join the worker thread */
pthread_join(priv->threadid, &value);
priv->threadid = 0;
return OK;
}
#endif
/****************************************************************************
* Name: cs4344_pause
*
* Description:
* Pauses the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
# ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_pause(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
# else
static int cs4344_pause(FAR struct audio_lowerhalf_s *dev)
# endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
if (priv->running && !priv->paused)
{
/* Disable interrupts to prevent us from suppling any more data */
priv->paused = true;
}
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: cs4344_resume
*
* Description:
* Resumes the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
# ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
# else
static int cs4344_resume(FAR struct audio_lowerhalf_s *dev)
# endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
if (priv->running && priv->paused)
{
priv->paused = false;
/* Enable interrupts to allow sampling data */
cs4344_sendbuffer(priv);
}
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: cs4344_enqueuebuffer
*
* Description:
* Enqueue an Audio Pipeline Buffer for playback/ processing.
*
****************************************************************************/
static int cs4344_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
struct audio_msg_s term_msg;
int ret;
audinfo("Enqueueing: apb=%p curbyte=%d nbytes=%d flags=%04x\n",
apb, apb->curbyte, apb->nbytes, apb->flags);
ret = cs4344_takesem(&priv->pendsem);
if (ret < 0)
{
return ret;
}
/* Take a reference on the new audio buffer */
apb_reference(apb);
/* Add the new buffer to the tail of pending audio buffers */
apb->flags |= AUDIO_APB_OUTPUT_ENQUEUED;
dq_addlast(&apb->dq_entry, &priv->pendq);
cs4344_givesem(&priv->pendsem);
/* Send a message to the worker thread indicating that a new buffer has
* been enqueued. If mq is NULL, then the playing has not yet started.
* In that case we are just "priming the pump" and we don't need to send
* any message.
*/
ret = OK;
if (priv->mq != NULL)
{
term_msg.msg_id = AUDIO_MSG_ENQUEUE;
term_msg.u.data = 0;
ret = nxmq_send(priv->mq, (FAR const char *)&term_msg,
sizeof(term_msg), CONFIG_CS4344_MSG_PRIO);
if (ret < 0)
{
auderr("ERROR: nxmq_send failed: %d\n", ret);
}
}
return ret;
}
/****************************************************************************
* Name: cs4344_cancelbuffer
*
* Description:
* Called when an enqueued buffer is being cancelled.
*
****************************************************************************/
static int cs4344_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
audinfo("apb=%p\n", apb);
return OK;
}
/****************************************************************************
* Name: cs4344_ioctl
*
* Description:
* Perform a device ioctl
*
****************************************************************************/
static int cs4344_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg)
{
int ret = OK;
#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
FAR struct ap_buffer_info_s *bufinfo;
#endif
/* Deal with ioctls passed from the upper-half driver */
switch (cmd)
{
/* Check for AUDIOIOC_HWRESET ioctl. This ioctl is passed straight
* through from the upper-half audio driver.
*/
case AUDIOIOC_HWRESET:
{
audinfo("AUDIOIOC_HWRESET:\n");
}
break;
/* Report our preferred buffer size and quantity */
#ifdef CONFIG_AUDIO_DRIVER_SPECIFIC_BUFFERS
case AUDIOIOC_GETBUFFERINFO:
{
audinfo("AUDIOIOC_GETBUFFERINFO:\n");
bufinfo = (FAR struct ap_buffer_info_s *)arg;
bufinfo->buffer_size = CONFIG_CS4344_BUFFER_SIZE;
bufinfo->nbuffers = CONFIG_CS4344_NUM_BUFFERS;
}
break;
#endif
default:
ret = -ENOTTY;
audinfo("Ignored\n");
break;
}
return ret;
}
/****************************************************************************
* Name: cs4344_reserve
*
* Description:
* Reserves a session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int
cs4344_reserve(FAR struct audio_lowerhalf_s *dev, FAR void **session)
#else
static int cs4344_reserve(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
int ret = OK;
/* Borrow the APBQ semaphore for thread sync */
ret = cs4344_takesem(&priv->pendsem);
if (ret < 0)
{
return ret;
}
if (priv->reserved)
{
ret = -EBUSY;
}
else
{
/* Initialize the session context */
#ifdef CONFIG_AUDIO_MULTI_SESSION
*session = NULL;
#endif
priv->inflight = 0;
priv->running = false;
priv->paused = false;
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
priv->terminating = false;
#endif
priv->reserved = true;
}
cs4344_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: cs4344_release
*
* Description:
* Releases the session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int cs4344_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int cs4344_release(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct cs4344_dev_s *priv = (FAR struct cs4344_dev_s *)dev;
FAR void *value;
int ret;
/* Join any old worker thread we had created to prevent a memory leak */
if (priv->threadid != 0)
{
pthread_join(priv->threadid, &value);
priv->threadid = 0;
}
/* Borrow the APBQ semaphore for thread sync */
ret = cs4344_forcetake(&priv->pendsem);
/* Really we should free any queued buffers here */
priv->reserved = false;
cs4344_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: cs4344_workerthread
*
* This is the thread that feeds data to the chip and keeps the audio
* stream going.
*
****************************************************************************/
static void *cs4344_workerthread(pthread_addr_t pvarg)
{
FAR struct cs4344_dev_s *priv = (struct cs4344_dev_s *)pvarg;
struct audio_msg_s msg;
FAR struct ap_buffer_s *apb;
int msglen;
unsigned int prio;
audinfo("Entry\n");
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
priv->terminating = false;
#endif
/* Mark ourself as running and make sure that CS4344 interrupts are
* enabled.
*/
priv->running = true;
/* Loop as long as we are supposed to be running and as long as we have
* buffers in-flight.
*/
while (priv->running || priv->inflight > 0)
{
/* Check if we have been asked to terminate. We have to check if we
* still have buffers in-flight. If we do, then we can't stop until
* birds come back to roost.
*/
if (priv->terminating && priv->inflight <= 0)
{
/* We are IDLE. Break out of the loop and exit. */
break;
}
else
{
/* Check if we can send more audio buffers to the CS4344 */
cs4344_sendbuffer(priv);
}
/* Wait for messages from our message queue */
msglen = nxmq_receive(priv->mq, (FAR char *)&msg, sizeof(msg), &prio);
/* Handle the case when we return with no message */
if (msglen < sizeof(struct audio_msg_s))
{
auderr("ERROR: Message too small: %d\n", msglen);
continue;
}
/* Process the message */
switch (msg.msg_id)
{
/* The ISR has requested more data. We will catch this case at
* the top of the loop.
*/
case AUDIO_MSG_DATA_REQUEST:
audinfo("AUDIO_MSG_DATA_REQUEST\n");
break;
/* Stop the playback */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
case AUDIO_MSG_STOP:
/* Indicate that we are terminating */
audinfo("AUDIO_MSG_STOP: Terminating\n");
priv->terminating = true;
break;
#endif
/* We have a new buffer to send. We will catch this case at
* the top of the loop.
*/
case AUDIO_MSG_ENQUEUE:
audinfo("AUDIO_MSG_ENQUEUE\n");
break;
/* We will wake up from the I2S callback with this message */
case AUDIO_MSG_COMPLETE:
audinfo("AUDIO_MSG_COMPLETE\n");
cs4344_returnbuffers(priv);
break;
default:
auderr("ERROR: Ignoring message ID %d\n", msg.msg_id);
break;
}
}
/* Reset the CS4344 hardware */
cs4344_reset(priv);
/* Return any pending buffers in our pending queue */
cs4344_forcetake(&priv->pendsem);
while ((apb = (FAR struct ap_buffer_s *)dq_remfirst(&priv->pendq)) != NULL)
{
/* Release our reference to the buffer */
apb_free(apb);
/* Send the buffer back up to the previous level. */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_DEQUEUE, apb, OK);
#endif
}
cs4344_givesem(&priv->pendsem);
/* Return any pending buffers in our done queue */
cs4344_returnbuffers(priv);
/* Close the message queue */
mq_close(priv->mq);
mq_unlink(priv->mqname);
priv->mq = NULL;
/* Send an AUDIO_MSG_COMPLETE message to the client */
#ifdef CONFIG_AUDIO_MULTI_SESSION
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK, NULL);
#else
priv->dev.upper(priv->dev.priv, AUDIO_CALLBACK_COMPLETE, NULL, OK);
#endif
audinfo("Exit\n");
return NULL;
}
/****************************************************************************
* Name: cs4344_reset
*
* Description:
* Reset and re-initialize the CS4344
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
static void cs4344_reset(FAR struct cs4344_dev_s *priv)
{
/* Put audio output back to its initial configuration */
priv->samprate = CS4344_DEFAULT_SAMPRATE;
priv->nchannels = CS4344_DEFAULT_NCHANNELS;
priv->bpsamp = CS4344_DEFAULT_BPSAMP;
/* Configure the FLL and the LRCLK */
cs4344_setbitrate(priv);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: cs4344_initialize
*
* Description:
* Initialize the CS4344 device.
*
* Input Parameters:
* i2s - An I2S driver instance
*
* Returned Value:
* A new lower half audio interface for the CS4344 device is returned on
* success; NULL is returned on failure.
*
****************************************************************************/
FAR struct audio_lowerhalf_s *cs4344_initialize(FAR struct i2s_dev_s *i2s)
{
FAR struct cs4344_dev_s *priv;
/* Sanity check */
DEBUGASSERT(i2s);
/* Allocate a CS4344 device structure */
priv = (FAR struct cs4344_dev_s *) kmm_zalloc(sizeof(struct cs4344_dev_s));
if (priv)
{
/* Initialize the CS4344 device structure. Since we used kmm_zalloc,
* only the non-zero elements of the structure need to be initialized.
*/
priv->dev.ops = &g_audioops;
priv->i2s = i2s;
nxsem_init(&priv->pendsem, 0, 1);
dq_init(&priv->pendq);
dq_init(&priv->doneq);
/* Reset and reconfigure the CS4344 hardware */
cs4344_reset(priv);
return &priv->dev;
}
nxsem_destroy(&priv->pendsem);
kmm_free(priv);
return NULL;
}