/**************************************************************************** * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 = file_mq_send(&priv->mq, (FAR const char *)&msg, sizeof(msg), CONFIG_CS4344_MSG_PRIO); if (ret < 0) { auderr("ERROR: file_mq_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; 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 ret; } /* 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; file_mq_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.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_CS4344_MSG_PRIO); if (ret < 0) { auderr("ERROR: file_mq_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 = 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"); 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 */ 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; } /**************************************************************************** * 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; }