// SPDX-License-Identifier: GPL-2.0-only
/*
* motu-pcm.c - a part of driver for MOTU FireWire series
*
* Copyright (c) 2015-2017 Takashi Sakamoto <[email protected]>
*/
#include <sound/pcm_params.h>
#include "motu.h"
static int motu_rate_constraint(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_motu_packet_format *formats = rule->private;
const struct snd_interval *c =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
struct snd_interval *r =
hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
struct snd_interval rates = {
.min = UINT_MAX, .max = 0, .integer = 1
};
unsigned int i, pcm_channels, rate, mode;
for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
rate = snd_motu_clock_rates[i];
mode = i / 2;
pcm_channels = formats->pcm_chunks[mode];
if (!snd_interval_test(c, pcm_channels))
continue;
rates.min = min(rates.min, rate);
rates.max = max(rates.max, rate);
}
return snd_interval_refine(r, &rates);
}
static int motu_channels_constraint(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_motu_packet_format *formats = rule->private;
const struct snd_interval *r =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
struct snd_interval *c =
hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
struct snd_interval channels = {
.min = UINT_MAX, .max = 0, .integer = 1
};
unsigned int i, pcm_channels, rate, mode;
for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
rate = snd_motu_clock_rates[i];
mode = i / 2;
if (!snd_interval_test(r, rate))
continue;
pcm_channels = formats->pcm_chunks[mode];
channels.min = min(channels.min, pcm_channels);
channels.max = max(channels.max, pcm_channels);
}
return snd_interval_refine(c, &channels);
}
static void limit_channels_and_rates(struct snd_motu *motu,
struct snd_pcm_runtime *runtime,
struct snd_motu_packet_format *formats)
{
struct snd_pcm_hardware *hw = &runtime->hw;
unsigned int i, pcm_channels, rate, mode;
hw->channels_min = UINT_MAX;
hw->channels_max = 0;
for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
rate = snd_motu_clock_rates[i];
mode = i / 2;
pcm_channels = formats->pcm_chunks[mode];
if (pcm_channels == 0)
continue;
hw->rates |= snd_pcm_rate_to_rate_bit(rate);
hw->channels_min = min(hw->channels_min, pcm_channels);
hw->channels_max = max(hw->channels_max, pcm_channels);
}
snd_pcm_limit_hw_rates(runtime);
}
static int init_hw_info(struct snd_motu *motu,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
struct amdtp_stream *stream;
struct snd_motu_packet_format *formats;
int err;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
hw->formats = SNDRV_PCM_FMTBIT_S32;
stream = &motu->tx_stream;
formats = &motu->tx_packet_formats;
} else {
hw->formats = SNDRV_PCM_FMTBIT_S32;
stream = &motu->rx_stream;
formats = &motu->rx_packet_formats;
}
limit_channels_and_rates(motu, runtime, formats);
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
motu_rate_constraint, formats,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
motu_channels_constraint, formats,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
return err;
return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
}
static int pcm_open(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
struct amdtp_domain *d = &motu->domain;
enum snd_motu_clock_source src;
int err;
err = snd_motu_stream_lock_try(motu);
if (err < 0)
return err;
mutex_lock(&motu->mutex);
err = snd_motu_stream_cache_packet_formats(motu);
if (err < 0)
goto err_locked;
err = init_hw_info(motu, substream);
if (err < 0)
goto err_locked;
err = snd_motu_protocol_get_clock_source(motu, &src);
if (err < 0)
goto err_locked;
// When source of clock is not internal or any stream is reserved for
// transmission of PCM frames, the available sampling rate is limited
// at current one.
if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&
src != SND_MOTU_CLOCK_SOURCE_SPH) ||
(motu->substreams_counter > 0 && d->events_per_period > 0)) {
unsigned int frames_per_period = d->events_per_period;
unsigned int frames_per_buffer = d->events_per_buffer;
unsigned int rate;
err = snd_motu_protocol_get_clock_rate(motu, &rate);
if (err < 0)
goto err_locked;
substream->runtime->hw.rate_min = rate;
substream->runtime->hw.rate_max = rate;
if (frames_per_period > 0) {
err = snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
frames_per_period, frames_per_period);
if (err < 0)
goto err_locked;
err = snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
frames_per_buffer, frames_per_buffer);
if (err < 0)
goto err_locked;
}
}
snd_pcm_set_sync(substream);
mutex_unlock(&motu->mutex);
return 0;
err_locked:
mutex_unlock(&motu->mutex);
snd_motu_stream_lock_release(motu);
return err;
}
static int pcm_close(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
snd_motu_stream_lock_release(motu);
return 0;
}
static int pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_motu *motu = substream->private_data;
int err = 0;
if (substream->runtime->state == SNDRV_PCM_STATE_OPEN) {
unsigned int rate = params_rate(hw_params);
unsigned int frames_per_period = params_period_size(hw_params);
unsigned int frames_per_buffer = params_buffer_size(hw_params);
mutex_lock(&motu->mutex);
err = snd_motu_stream_reserve_duplex(motu, rate,
frames_per_period, frames_per_buffer);
if (err >= 0)
++motu->substreams_counter;
mutex_unlock(&motu->mutex);
}
return err;
}
static int pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
mutex_lock(&motu->mutex);
if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
--motu->substreams_counter;
snd_motu_stream_stop_duplex(motu);
mutex_unlock(&motu->mutex);
return 0;
}
static int capture_prepare(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
int err;
mutex_lock(&motu->mutex);
err = snd_motu_stream_start_duplex(motu);
mutex_unlock(&motu->mutex);
if (err >= 0)
amdtp_stream_pcm_prepare(&motu->tx_stream);
return 0;
}
static int playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
int err;
mutex_lock(&motu->mutex);
err = snd_motu_stream_start_duplex(motu);
mutex_unlock(&motu->mutex);
if (err >= 0)
amdtp_stream_pcm_prepare(&motu->rx_stream);
return err;
}
static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_motu *motu = substream->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
break;
default:
return -EINVAL;
}
return 0;
}
static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_motu *motu = substream->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
break;
default:
return -EINVAL;
}
return 0;
}
static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->tx_stream);
}
static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->rx_stream);
}
static int capture_ack(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->tx_stream);
}
static int playback_ack(struct snd_pcm_substream *substream)
{
struct snd_motu *motu = substream->private_data;
return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->rx_stream);
}
int snd_motu_create_pcm_devices(struct snd_motu *motu)
{
static const struct snd_pcm_ops capture_ops = {
.open = pcm_open,
.close = pcm_close,
.hw_params = pcm_hw_params,
.hw_free = pcm_hw_free,
.prepare = capture_prepare,
.trigger = capture_trigger,
.pointer = capture_pointer,
.ack = capture_ack,
};
static const struct snd_pcm_ops playback_ops = {
.open = pcm_open,
.close = pcm_close,
.hw_params = pcm_hw_params,
.hw_free = pcm_hw_free,
.prepare = playback_prepare,
.trigger = playback_trigger,
.pointer = playback_pointer,
.ack = playback_ack,
};
struct snd_pcm *pcm;
int err;
err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
if (err < 0)
return err;
pcm->private_data = motu;
pcm->nonatomic = true;
strcpy(pcm->name, motu->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
return 0;
}
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