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-rw-r--r--sound/firewire/motu/motu-pcm.c370
1 files changed, 370 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
new file mode 100644
index 000000000..d410c2efb
--- /dev/null
+++ b/sound/firewire/motu/motu-pcm.c
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * motu-pcm.c - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ */
+
+#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;
+ 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;
+}