/* hw_params callback */
static int snd_bcm2835_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
int err;
struct snd_pcm_runtime *runtime = substream->runtime;
bcm2835_alsa_stream_t *alsa_stream =
(bcm2835_alsa_stream_t *) runtime->private_data;
audio_info(" .. IN\n");
err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
if (err < 0) {
audio_error
(" pcm_lib_malloc failed to allocated pages for buffers\n");
return err;
}
err = bcm2835_audio_set_params(alsa_stream, params_channels(params),
params_rate(params),
snd_pcm_format_width(params_format
(params)));
if (err < 0) {
audio_error(" error setting hw params\n");
}
bcm2835_audio_setup(alsa_stream);
audio_info(" .. OUT\n");
return err;
}
/* close callback */
static int snd_bcm2835_playback_close(struct snd_pcm_substream *substream)
{
/* the hardware-specific codes will be here */
struct bcm2835_chip *chip;
struct snd_pcm_runtime *runtime;
struct bcm2835_alsa_stream *alsa_stream;
audio_info(" .. IN\n");
chip = snd_pcm_substream_chip(substream);
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
runtime = substream->runtime;
alsa_stream = runtime->private_data;
audio_info("Alsa close\n");
/*
* Call stop if it's still running. This happens when app
* is force killed and we don't get a stop trigger.
*/
if (alsa_stream->running) {
int err;
err = bcm2835_audio_stop(alsa_stream);
alsa_stream->running = 0;
if (err)
audio_error(" Failed to STOP alsa device\n");
}
alsa_stream->period_size = 0;
alsa_stream->buffer_size = 0;
if (alsa_stream->open) {
alsa_stream->open = 0;
bcm2835_audio_close(alsa_stream);
}
if (alsa_stream->chip)
alsa_stream->chip->alsa_stream[alsa_stream->idx] = NULL;
/*
* Do not free up alsa_stream here, it will be freed up by
* runtime->private_free callback we registered in *_open above
*/
chip->opened &= ~(1 << substream->number);
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
/* trigger callback */
static int snd_bcm2835_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
int err = 0;
audio_info(" .. IN\n");
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
audio_debug("bcm2835_AUDIO_TRIGGER_START running=%d\n",
alsa_stream->running);
if (!alsa_stream->running) {
err = bcm2835_audio_start(alsa_stream);
if (!err) {
alsa_stream->pcm_indirect.hw_io =
alsa_stream->pcm_indirect.hw_data =
bytes_to_frames(runtime,
alsa_stream->pos);
substream->ops->ack(substream);
alsa_stream->running = 1;
alsa_stream->draining = 1;
} else {
audio_error(" Failed to START alsa device (%d)\n", err);
}
}
break;
case SNDRV_PCM_TRIGGER_STOP:
audio_debug
("bcm2835_AUDIO_TRIGGER_STOP running=%d draining=%d\n",
alsa_stream->running, runtime->status->state == SNDRV_PCM_STATE_DRAINING);
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
audio_info("DRAINING\n");
alsa_stream->draining = 1;
} else {
audio_info("DROPPING\n");
alsa_stream->draining = 0;
}
if (alsa_stream->running) {
err = bcm2835_audio_stop(alsa_stream);
if (err != 0)
audio_error(" Failed to STOP alsa device (%d)\n", err);
alsa_stream->running = 0;
}
break;
default:
err = -EINVAL;
}
audio_info(" .. OUT\n");
return err;
}
int snd_bcm2835_new_spdif_pcm(struct bcm2835_chip *chip)
{
struct snd_pcm *pcm;
int err;
audio_info(" .. IN\n");
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
err = snd_pcm_new(chip->card, "bcm2835 ALSA", 1, 1, 0, &pcm);
if (err < 0)
goto out;
pcm->private_data = chip;
strcpy(pcm->name, "bcm2835 IEC958/HDMI");
chip->pcm_spdif = pcm;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
&snd_bcm2835_playback_spdif_ops);
/* pre-allocation of buffers */
/* NOTE: this may fail */
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
snd_bcm2835_playback_spdif_hw.buffer_bytes_max, snd_bcm2835_playback_spdif_hw.buffer_bytes_max);
out:
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
audio_context::audio_context(const audio_settings& settings)
: device(settings.output_device_name)
{
#if BUILD_OPENAL
context = alcCreateContext(device, nullptr);
if (!context || !set_as_current()) {
if (context) {
AL_CHECK(alcDestroyContext(context));
}
throw audio_error(
"Failed to set an OpenAL context on device: %x",
settings.output_device_name
);
}
AL_CHECK(alEnable(AL_SOURCE_DISTANCE_MODEL));
device.log_hrtf_status();
apply(settings, true);
{
ALint num_stereo_sources;
ALint num_mono_sources;
alcGetIntegerv(device, ALC_STEREO_SOURCES, 1, &num_stereo_sources);
alcGetIntegerv(device, ALC_MONO_SOURCES, 1, &num_mono_sources);
LOG_NVPS(num_stereo_sources, num_mono_sources);
}
#endif
}
/* prepare callback */
static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
{
struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
int channels;
int err;
audio_info(" .. IN\n");
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
/* notify the vchiq that it should enter spdif passthrough mode by
* setting channels=0 (see
* https://github.com/raspberrypi/linux/issues/528) */
if (chip->spdif_status & IEC958_AES0_NONAUDIO)
channels = 0;
else
channels = alsa_stream->channels;
err = bcm2835_audio_set_params(alsa_stream, channels,
alsa_stream->params_rate,
alsa_stream->pcm_format_width);
if (err < 0) {
audio_error(" error setting hw params\n");
}
bcm2835_audio_setup(alsa_stream);
/* in preparation of the stream, set the controls (volume level) of the stream */
bcm2835_audio_set_ctls(alsa_stream->chip);
memset(&alsa_stream->pcm_indirect, 0, sizeof(alsa_stream->pcm_indirect));
alsa_stream->pcm_indirect.hw_buffer_size =
alsa_stream->pcm_indirect.sw_buffer_size =
snd_pcm_lib_buffer_bytes(substream);
alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
alsa_stream->pos = 0;
audio_debug("buffer_size=%d, period_size=%d pos=%d frame_bits=%d\n",
alsa_stream->buffer_size, alsa_stream->period_size,
alsa_stream->pos, runtime->frame_bits);
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
static void snd_bcm2835_pcm_transfer(struct snd_pcm_substream *substream,
struct snd_pcm_indirect *rec, size_t bytes)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
void *src = (void *) (substream->runtime->dma_area + rec->sw_data);
int err;
err = bcm2835_audio_write(alsa_stream, bytes, src);
if (err)
audio_error(" Failed to transfer to alsa device (%d)\n", err);
}
/* close callback */
static int snd_bcm2835_playback_close(struct snd_pcm_substream *substream)
{
/* the hardware-specific codes will be here */
struct snd_pcm_runtime *runtime = substream->runtime;
bcm2835_alsa_stream_t *alsa_stream = runtime->private_data;
audio_info(" .. IN\n");
audio_warning("Alsa close\n");
/*
* Call stop if it's still running. This happens when app
* is force killed and we don't get a stop trigger.
*/
if (alsa_stream->running) {
int err;
err = bcm2835_audio_stop(alsa_stream);
alsa_stream->running = 0;
if (err != 0)
audio_error(" Failed to STOP alsa device\n");
}
alsa_stream->period_size = 0;
alsa_stream->buffer_size = 0;
if (alsa_stream->open) {
alsa_stream->open = 0;
bcm2835_audio_close(alsa_stream);
}
if (alsa_stream->chip)
alsa_stream->chip->alsa_stream[alsa_stream->idx] = NULL;
/*
* Do not free up alsa_stream here, it will be freed up by
* runtime->private_free callback we registered in *_open above
*/
audio_info(" .. OUT\n");
return 0;
}
/* create a pcm device */
int snd_bcm2835_new_pcm(struct bcm2835_chip *chip)
{
struct snd_pcm *pcm;
int err;
audio_info(" .. IN\n");
mutex_init(&chip->audio_mutex);
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
err = snd_pcm_new(chip->card, "bcm2835 ALSA", 0, MAX_SUBSTREAMS, 0, &pcm);
if (err < 0)
goto out;
pcm->private_data = chip;
strcpy(pcm->name, "bcm2835 ALSA");
chip->pcm = pcm;
chip->dest = AUDIO_DEST_AUTO;
chip->volume = alsa2chip(0);
chip->mute = CTRL_VOL_UNMUTE; /*disable mute on startup */
/* set operators */
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
&snd_bcm2835_playback_ops);
/* pre-allocation of buffers */
/* NOTE: this may fail */
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
snd_bcm2835_playback_hw.buffer_bytes_max,
snd_bcm2835_playback_hw.buffer_bytes_max);
out:
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
/* hw_params callback */
static int snd_bcm2835_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
int err;
audio_info(" .. IN\n");
err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
if (err < 0) {
audio_error
(" pcm_lib_malloc failed to allocated pages for buffers\n");
return err;
}
alsa_stream->channels = params_channels(params);
alsa_stream->params_rate = params_rate(params);
alsa_stream->pcm_format_width = snd_pcm_format_width(params_format(params));
audio_info(" .. OUT\n");
return err;
}
/* open callback */
static int snd_bcm2835_playback_open_generic(
struct snd_pcm_substream *substream, int spdif)
{
struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream;
int idx;
int err;
audio_info(" .. IN (%d)\n", substream->number);
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
audio_info("Alsa open (%d)\n", substream->number);
idx = substream->number;
if (spdif && chip->opened) {
err = -EBUSY;
goto out;
} else if (!spdif && (chip->opened & (1 << idx))) {
err = -EBUSY;
goto out;
}
if (idx >= MAX_SUBSTREAMS) {
audio_error
("substream(%d) device doesn't exist max(%d) substreams allowed\n",
idx, MAX_SUBSTREAMS);
err = -ENODEV;
goto out;
}
/* Check if we are ready */
if (!(chip->avail_substreams & (1 << idx))) {
/* We are not ready yet */
audio_error("substream(%d) device is not ready yet\n", idx);
err = -EAGAIN;
goto out;
}
alsa_stream = kzalloc(sizeof(*alsa_stream), GFP_KERNEL);
if (!alsa_stream) {
err = -ENOMEM;
goto out;
}
/* Initialise alsa_stream */
alsa_stream->chip = chip;
alsa_stream->substream = substream;
alsa_stream->idx = idx;
sema_init(&alsa_stream->buffers_update_sem, 0);
sema_init(&alsa_stream->control_sem, 0);
spin_lock_init(&alsa_stream->lock);
err = bcm2835_audio_open(alsa_stream);
if (err) {
kfree(alsa_stream);
goto out;
}
runtime->private_data = alsa_stream;
runtime->private_free = snd_bcm2835_playback_free;
if (spdif) {
runtime->hw = snd_bcm2835_playback_spdif_hw;
} else {
/* clear spdif status, as we are not in spdif mode */
chip->spdif_status = 0;
runtime->hw = snd_bcm2835_playback_hw;
}
/* minimum 16 bytes alignment (for vchiq bulk transfers) */
snd_pcm_hw_constraint_step(runtime,
0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
16);
chip->alsa_stream[idx] = alsa_stream;
chip->opened |= (1 << idx);
alsa_stream->open = 1;
alsa_stream->draining = 1;
out:
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT =%d\n", err);
return err;
}
/* open callback */
static int snd_bcm2835_playback_open(struct snd_pcm_substream *substream)
{
bcm2835_chip_t *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
bcm2835_alsa_stream_t *alsa_stream;
int idx;
int err;
audio_info(" .. IN (%d)\n", substream->number);
audio_warning("Alsa open (%d)\n", substream->number);
idx = substream->number;
if (idx > MAX_SUBSTREAMS) {
audio_error
("substream(%d) device doesn't exist max(%d) substreams allowed\n",
idx, MAX_SUBSTREAMS);
err = -ENODEV;
goto out;
}
/* Check if we are ready */
if (!(chip->avail_substreams & (1 << idx))) {
/* We are not ready yet */
audio_error("substream(%d) device is not ready yet\n", idx);
err = -EAGAIN;
goto out;
}
alsa_stream = kzalloc(sizeof(bcm2835_alsa_stream_t), GFP_KERNEL);
if (alsa_stream == NULL) {
return -ENOMEM;
}
/* Initialise alsa_stream */
alsa_stream->chip = chip;
alsa_stream->substream = substream;
alsa_stream->idx = idx;
chip->alsa_stream[idx] = alsa_stream;
sema_init(&alsa_stream->buffers_update_sem, 0);
sema_init(&alsa_stream->control_sem, 0);
spin_lock_init(&alsa_stream->lock);
/* Enabled in start trigger, called on each "fifo irq" after that */
alsa_stream->enable_fifo_irq = 0;
alsa_stream->fifo_irq_handler = bcm2835_playback_fifo_irq;
runtime->private_data = alsa_stream;
runtime->private_free = snd_bcm2835_playback_free;
runtime->hw = snd_bcm2835_playback_hw;
/* minimum 16 bytes alignment (for vchiq bulk transfers) */
snd_pcm_hw_constraint_step(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
16);
err = bcm2835_audio_open(alsa_stream);
if (err != 0) {
kfree(alsa_stream);
return err;
}
alsa_stream->open = 1;
alsa_stream->draining = 1;
out:
audio_info(" .. OUT =%d\n", err);
return err;
}
