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nuttx/drivers/audio/wm8776.c
Xiang Xiao 9473434587 Ensure the kernel component don't call userspace API 
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2021-03-01 09:23:09 +09:00

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/****************************************************************************
* drivers/audio/wm8776.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/irq.h>
#include <nuttx/kmalloc.h>
#include <nuttx/semaphore.h>
#include <nuttx/clock.h>
#include <nuttx/wqueue.h>
#include <nuttx/i2c/i2c_master.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/audio/i2s.h>
#include <nuttx/audio/audio.h>
#include <nuttx/audio/wm8776.h>
#include "wm8776.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
static void wm8776_writereg(FAR struct wm8776_dev_s *priv,
uint8_t regaddr, uint16_t regval);
static int wm8776_takesem(FAR sem_t *sem);
static int wm8776_forcetake(FAR sem_t *sem);
#define wm8776_givesem(s) nxsem_post(s)
static int wm8776_getcaps(FAR struct audio_lowerhalf_s *dev, int type,
FAR struct audio_caps_s *caps);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session, FAR const struct audio_caps_s *caps);
#else
static int wm8776_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps);
#endif
static int wm8776_shutdown(FAR struct audio_lowerhalf_s *dev);
static void wm8776_senddone(FAR struct i2s_dev_s *i2s,
FAR struct ap_buffer_s *apb, FAR void *arg, int result);
static void wm8776_returnbuffers(FAR struct wm8776_dev_s *priv);
static int wm8776_sendbuffer(FAR struct wm8776_dev_s *priv);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_start(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8776_start(FAR struct audio_lowerhalf_s *dev);
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_stop(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8776_stop(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_pause(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
static int wm8776_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8776_pause(FAR struct audio_lowerhalf_s *dev);
static int wm8776_resume(FAR struct audio_lowerhalf_s *dev);
#endif
#endif
static int wm8776_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int wm8776_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb);
static int wm8776_ioctl(FAR struct audio_lowerhalf_s *dev, int cmd,
unsigned long arg);
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session);
#else
static int wm8776_reserve(FAR struct audio_lowerhalf_s *dev);
#endif
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session);
#else
static int wm8776_release(FAR struct audio_lowerhalf_s *dev);
#endif
static void *wm8776_workerthread(pthread_addr_t pvarg);
/* Initialization */
static void wm8776_audio_output(FAR struct wm8776_dev_s *priv);
#if 0 /* Not used */
static void wm8776_audio_input(FAR struct wm8776_dev_s *priv);
#endif
static void wm8776_hw_reset(FAR struct wm8776_dev_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct audio_ops_s g_audioops =
{
wm8776_getcaps, /* getcaps */
wm8776_configure, /* configure */
wm8776_shutdown, /* shutdown */
wm8776_start, /* start */
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
wm8776_stop, /* stop */
#endif
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
wm8776_pause, /* pause */
wm8776_resume, /* resume */
#endif
NULL, /* allocbuffer */
NULL, /* freebuffer */
wm8776_enqueuebuffer, /* enqueue_buffer */
wm8776_cancelbuffer, /* cancel_buffer */
wm8776_ioctl, /* ioctl */
NULL, /* read */
NULL, /* write */
wm8776_reserve, /* reserve */
wm8776_release /* release */
};
/****************************************************************************
* Name: wm8776_writereg
*
* Description:
* Write the specified 16-bit register to the WM8776 device.
*
****************************************************************************/
static void wm8776_writereg(FAR struct wm8776_dev_s *priv,
uint8_t regaddr,
uint16_t regval)
{
struct i2c_config_s config;
uint8_t data[2];
int ret;
/* Setup up the I2C configuration */
config.frequency = priv->lower->frequency;
config.address = priv->lower->address;
config.addrlen = 7;
/* Set up the data to write */
data[0] = (regaddr << 1) + ((regval >> 8) & 0x1);
data[1] = (regval & 0xff);
ret = i2c_write(priv->i2c, &config, data, sizeof(data));
if (ret < 0)
{
auderr("ERROR: I2C_TRANSFER failed: %d\n", ret);
}
}
/****************************************************************************
* Name: wm8776_takesem
*
* Description:
* Take a semaphore count, handling the nasty EINTR return if we are
* interrupted by a signal.
*
****************************************************************************/
static int wm8776_takesem(sem_t *sem)
{
return nxsem_wait_uninterruptible(sem);
}
/****************************************************************************
* Name: wm8776_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 wm8776_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: wm8776_setvolume
*
* Description:
* Set the right and left volume values in the WM8776 device based on the
* current volume and balance settings.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
static void wm8776_setvolume(FAR struct wm8776_dev_s *priv, uint16_t volume,
bool mute)
{
uint16_t regval;
uint16_t tmp_vol;
/* TODO: balance */
if (mute)
{
tmp_vol = 0;
}
else
{
tmp_vol = volume;
}
/* limit the max vol */
if (tmp_vol > 0x69)
{
tmp_vol = 0x69; /* -10db */
}
regval = WM8776_UPDATE | WM8776_HPOUT_VOL(tmp_vol);
wm8776_writereg(priv, WM8776_MASTER_ATT, regval);
audinfo("volume=%d mute=%d tmp_vol=%d (regval=0x%x) \n",
volume, mute, tmp_vol, regval);
/* Remember the volume level and mute settings */
priv->volume = volume;
priv->mute = mute;
}
#endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */
/****************************************************************************
* Name: wm8776_getcaps
*
* Description:
* Get the audio device capabilities
*
****************************************************************************/
static int wm8776_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;
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_44K;
break;
case AUDIO_FMT_MP3:
case AUDIO_FMT_WMA:
case AUDIO_FMT_PCM:
default:
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: wm8776_configure
*
* Description:
* Configure the audio device for the specified mode of operation.
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_configure(FAR struct audio_lowerhalf_s *dev,
FAR void *session,
FAR const struct audio_caps_s *caps)
#else
static int wm8776_configure(FAR struct audio_lowerhalf_s *dev,
FAR const struct audio_caps_s *caps)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_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)
{
#ifndef CONFIG_AUDIO_EXCLUDE_VOLUME
case AUDIO_FU_VOLUME:
{
/* Set the volume */
uint16_t volume = caps->ac_controls.hw[0];
audinfo(" Volume: %d\n", volume);
if (volume >= 0 && volume <= 1000)
{
/* Scale the volume setting to the range {0x2f .. 0x79} */
wm8776_setvolume(priv, (0x4a * volume / 1000) + 0x2f,
priv->mute);
}
else
{
ret = -EDOM;
}
}
break;
#endif /* CONFIG_AUDIO_EXCLUDE_VOLUME */
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];
/* TODO : channels, bits per sample, bitrate */
ret = OK;
}
break;
case AUDIO_TYPE_PROCESSING:
break;
}
return ret;
}
/****************************************************************************
* Name: wm8776_shutdown
*
* Description:
* Shutdown the WM8776 chip and put it in the lowest power state possible.
*
****************************************************************************/
static int wm8776_shutdown(FAR struct audio_lowerhalf_s *dev)
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_dev_s *)dev;
DEBUGASSERT(priv);
/* Now issue a software reset. This puts all WM8776 registers back in
* their default state.
*/
wm8776_hw_reset(priv);
return OK;
}
/****************************************************************************
* Name: wm8776_senddone
*
* Description:
* This is the I2S callback function that is invoked when the transfer
* completes.
*
****************************************************************************/
static void wm8776_senddone(FAR struct i2s_dev_s *i2s,
FAR struct ap_buffer_s *apb, FAR void *arg,
int result)
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_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 = spin_lock_irqsave(NULL);
/* 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;
spin_unlock_irqrestore(NULL, 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 = file_mq_send(&priv->mq, (FAR const char *)&msg, sizeof(msg),
CONFIG_WM8776_MSG_PRIO);
if (ret < 0)
{
auderr("ERROR: file_mq_send failed: %d\n", ret);
}
}
/****************************************************************************
* Name: wm8776_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 wm8776_returnbuffers(FAR struct wm8776_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 = spin_lock_irqsave(NULL);
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);
spin_unlock_irqrestore(NULL, 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 = spin_lock_irqsave(NULL);
}
spin_unlock_irqrestore(NULL, flags);
}
/****************************************************************************
* Name: wm8776_sendbuffer
*
* Description:
* Start the transfer an audio buffer to the WM8776 via I2S. This
* will not wait for the transfer to complete but will return immediately.
* the wmd8776_senddone called will be invoked when the transfer
* completes, stimulating the worker thread to call this function again.
*
****************************************************************************/
static int wm8776_sendbuffer(FAR struct wm8776_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_WM8776_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 = wm8776_takesem(&priv->pendsem);
if (ret < 0)
{
return ret;
}
while (priv->inflight < CONFIG_WM8776_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 = spin_lock_irqsave(NULL);
priv->inflight++;
spin_unlock_irqrestore(NULL, flags);
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, wm8776_senddone, priv, timeout);
if (ret < 0)
{
auderr("ERROR: I2S_SEND failed: %d\n", ret);
break;
}
}
wm8776_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: wm8776_start
*
* Description:
* Start the configured operation (audio streaming, volume enabled, etc.).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_start(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8776_start(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_dev_s *)dev;
struct sched_param sparam;
struct mq_attr attr;
pthread_attr_t tattr;
FAR void *value;
int ret;
audinfo("Entry\n");
/* Exit reduced power modes of operation */
/* REVISIT */
/* 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;
ret = file_mq_open(&priv->mq, priv->mqname,
O_RDWR | O_CREAT, 0644, &attr);
if (ret < 0)
{
/* 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_WM8776_WORKER_STACKSIZE);
audinfo("Starting worker thread\n");
ret = pthread_create(&priv->threadid, &tattr, wm8776_workerthread,
(pthread_addr_t)priv);
if (ret != OK)
{
auderr("ERROR: pthread_create failed: %d\n", ret);
}
else
{
pthread_setname_np(priv->threadid, "wm8776");
audinfo("Created worker thread\n");
}
return ret;
}
/****************************************************************************
* Name: wm8776_stop
*
* Description: Stop the configured operation (audio streaming, volume
* disabled, etc.).
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_stop(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8776_stop(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_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;
file_mq_send(&priv->mq, (FAR const char *)&term_msg, sizeof(term_msg),
CONFIG_WM8776_MSG_PRIO);
/* Join the worker thread */
pthread_join(priv->threadid, &value);
priv->threadid = 0;
/* Enter into a reduced power usage mode */
/* REVISIT: */
return OK;
}
#endif
/****************************************************************************
* Name: wm8776_pause
*
* Description: Pauses the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_pause(FAR struct audio_lowerhalf_s *dev, FAR void *session)
#else
static int wm8776_pause(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_dev_s *)dev;
if (priv->running && !priv->paused)
{
priv->paused = true;
wm8776_setvolume(priv, priv->volume, true);
}
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: wm8776_resume
*
* Description: Resumes the playback.
*
****************************************************************************/
#ifndef CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_resume(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int wm8776_resume(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_dev_s *)dev;
if (priv->running && priv->paused)
{
priv->paused = false;
wm8776_setvolume(priv, priv->volume, false);
wm8776_sendbuffer(priv);
}
return OK;
}
#endif /* CONFIG_AUDIO_EXCLUDE_PAUSE_RESUME */
/****************************************************************************
* Name: wm8776_enqueuebuffer
*
* Description: Enqueue an Audio Pipeline Buffer for playback/ processing.
*
****************************************************************************/
static int wm8776_enqueuebuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_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);
/* Take a reference on the new audio buffer */
apb_reference(apb);
/* Add the new buffer to the tail of pending audio buffers */
ret = wm8776_takesem(&priv->pendsem);
if (ret < 0)
{
return ret;
}
apb->flags |= AUDIO_APB_OUTPUT_ENQUEUED;
dq_addlast(&apb->dq_entry, &priv->pendq);
wm8776_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.f_inode != NULL)
{
term_msg.msg_id = AUDIO_MSG_ENQUEUE;
term_msg.u.data = 0;
ret = file_mq_send(&priv->mq, (FAR const char *)&term_msg,
sizeof(term_msg), CONFIG_WM8776_MSG_PRIO);
if (ret < 0)
{
auderr("ERROR: file_mq_send failed: %d\n", ret);
}
}
return ret;
}
/****************************************************************************
* Name: wm8776_cancelbuffer
*
* Description: Called when an enqueued buffer is being cancelled.
*
****************************************************************************/
static int wm8776_cancelbuffer(FAR struct audio_lowerhalf_s *dev,
FAR struct ap_buffer_s *apb)
{
audinfo("apb=%p\n", apb);
return OK;
}
/****************************************************************************
* Name: wm8776_ioctl
*
* Description: Perform a device ioctl
*
****************************************************************************/
static int wm8776_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:
{
/* REVISIT: Should we completely re-initialize the chip? We
* can't just issue a software reset; that would puts all WM8776
* registers back in their default state.
*/
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_WM8776_BUFFER_SIZE;
bufinfo->nbuffers = CONFIG_WM8776_NUM_BUFFERS;
}
break;
#endif
default:
ret = -ENOTTY;
audinfo("Ignored\n");
break;
}
return ret;
}
/****************************************************************************
* Name: wm8776_reserve
*
* Description: Reserves a session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_reserve(FAR struct audio_lowerhalf_s *dev,
FAR void **session)
#else
static int wm8776_reserve(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_dev_s *) dev;
int ret = OK;
/* Borrow the APBQ semaphore for thread sync */
ret = wm8776_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;
}
wm8776_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: wm8776_release
*
* Description: Releases the session (the only one we have).
*
****************************************************************************/
#ifdef CONFIG_AUDIO_MULTI_SESSION
static int wm8776_release(FAR struct audio_lowerhalf_s *dev,
FAR void *session)
#else
static int wm8776_release(FAR struct audio_lowerhalf_s *dev)
#endif
{
FAR struct wm8776_dev_s *priv = (FAR struct wm8776_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 = wm8776_forcetake(&priv->pendsem);
/* Really we should free any queued buffers here */
priv->reserved = false;
wm8776_givesem(&priv->pendsem);
return ret;
}
/****************************************************************************
* Name: wm8776_audio_output
*
* Description:
* Initialize and configure the WM8776 device as an audio output device.
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None. No failures are detected.
*
****************************************************************************/
static void wm8776_audio_output(FAR struct wm8776_dev_s *priv)
{
wm8776_writereg(priv, WM8776_MASTER_ATT,
WM8776_UPDATE | 0x58); /* -33db */
wm8776_writereg(priv, WM8776_DAC_IF, 0x32); /* 32bit, I2S, standard pol */
#ifdef CONFIG_WM8776_SWAP_HPOUT
wm8776_writereg(priv, WM8776_DAC_CC, 0x62); /* Swap HPOUT L/R */
#endif
wm8776_writereg(priv, WM8776_MASTER_MODE, 0x00); /* slave mode, 128fs */
wm8776_writereg(priv, WM8776_PWR_DOWN, 0x12); /* AINPD, ADCPD */
}
/****************************************************************************
* Name: wm8776_hw_reset
*
* Description:
* Reset and re-initialize the WM8776
*
* Input Parameters:
* priv - A reference to the driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
static void wm8776_hw_reset(FAR struct wm8776_dev_s *priv)
{
/* Put audio output back to its initial configuration */
priv->samprate = WM8776_DEFAULT_SAMPRATE;
priv->nchannels = WM8776_DEFAULT_NCHANNELS;
priv->bpsamp = WM8776_DEFAULT_BPSAMP;
#if !defined(CONFIG_AUDIO_EXCLUDE_VOLUME) && !defined(CONFIG_AUDIO_EXCLUDE_BALANCE)
priv->balance = b16HALF; /* Center balance */
#endif
/* Software reset. This puts all WM8776 registers back in their
* default state.
*/
wm8776_writereg(priv, WM8776_SOFT_RESET, 0x00);
/* Configure the WM8776 hardware as an audio input device */
wm8776_audio_output(priv);
}
/****************************************************************************
* Name: wm8776_workerthread
*
* This is the thread that feeds data to the chip and keeps the audio
* stream going.
*
****************************************************************************/
static void *wm8776_workerthread(pthread_addr_t pvarg)
{
FAR struct wm8776_dev_s *priv = (struct wm8776_dev_s *) pvarg;
struct audio_msg_s msg;
FAR struct ap_buffer_s *apb;
int msglen;
unsigned int prio;
struct mq_attr attr;
audinfo("Entry\n");
#ifndef CONFIG_AUDIO_EXCLUDE_STOP
priv->terminating = false;
#endif
priv->running = true;
wm8776_setvolume(priv, priv->volume, false);
/* 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 WM8776 */
wm8776_sendbuffer(priv);
}
repeat:
/* Wait for messages from our message queue */
msglen = file_mq_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");
wm8776_returnbuffers(priv);
break;
default:
auderr("ERROR: Ignoring message ID %d\n", msg.msg_id);
break;
}
file_mq_getattr(&priv->mq, &attr);
/* If there is a message in the queue, process it */
if (0 < attr.mq_curmsgs)
{
goto repeat;
}
}
/* Reset the WM8776 hardware */
wm8776_hw_reset(priv);
/* Return any pending buffers in our pending queue */
wm8776_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
}
wm8776_givesem(&priv->pendsem);
/* Return any pending buffers in our done queue */
wm8776_returnbuffers(priv);
/* Close the message queue */
file_mq_close(&priv->mq);
file_mq_unlink(priv->mqname);
/* 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;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wm8776_initialize
*
* Description:
* Initialize the WM8776 device.
*
* Input Parameters:
* i2c - An I2C driver instance
* i2s - An I2S driver instance
* lower - Persistent board configuration data
*
* Returned Value:
* A new lower half audio interface for the WM8776 device is returned on
* success; NULL is returned on failure.
*
****************************************************************************/
FAR struct audio_lowerhalf_s *
wm8776_initialize(FAR struct i2c_master_s *i2c,
FAR struct i2s_dev_s *i2s,
FAR const struct wm8776_lower_s *lower)
{
FAR struct wm8776_dev_s *priv;
/* Sanity check */
DEBUGASSERT(i2c && i2s && lower);
/* Allocate a WM8776 device structure */
priv = (FAR struct wm8776_dev_s *)kmm_zalloc(sizeof(struct wm8776_dev_s));
if (priv)
{
priv->dev.ops = &g_audioops;
priv->lower = lower;
priv->i2c = i2c;
priv->i2s = i2s;
nxsem_init(&priv->pendsem, 0, 1);
dq_init(&priv->pendq);
dq_init(&priv->doneq);
/* Reset and reconfigure the WM8776 hardwaqre */
wm8776_hw_reset(priv);
return &priv->dev;
}
return NULL;
}
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