361 lines
9.0 KiB
C
361 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* motu-pcm.c - a part of driver for MOTU FireWire series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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*/
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#include <sound/pcm_params.h>
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#include "motu.h"
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static int motu_rate_constraint(struct snd_pcm_hw_params *params,
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struct snd_pcm_hw_rule *rule)
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{
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struct snd_motu_packet_format *formats = rule->private;
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const struct snd_interval *c =
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hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
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struct snd_interval *r =
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hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
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struct snd_interval rates = {
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.min = UINT_MAX, .max = 0, .integer = 1
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};
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unsigned int i, pcm_channels, rate, mode;
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for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
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rate = snd_motu_clock_rates[i];
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mode = i / 2;
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pcm_channels = formats->fixed_part_pcm_chunks[mode] +
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formats->differed_part_pcm_chunks[mode];
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if (!snd_interval_test(c, pcm_channels))
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continue;
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rates.min = min(rates.min, rate);
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rates.max = max(rates.max, rate);
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}
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return snd_interval_refine(r, &rates);
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}
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static int motu_channels_constraint(struct snd_pcm_hw_params *params,
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struct snd_pcm_hw_rule *rule)
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{
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struct snd_motu_packet_format *formats = rule->private;
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const struct snd_interval *r =
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hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
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struct snd_interval *c =
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hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
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struct snd_interval channels = {
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.min = UINT_MAX, .max = 0, .integer = 1
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};
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unsigned int i, pcm_channels, rate, mode;
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for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
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rate = snd_motu_clock_rates[i];
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mode = i / 2;
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if (!snd_interval_test(r, rate))
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continue;
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pcm_channels = formats->fixed_part_pcm_chunks[mode] +
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formats->differed_part_pcm_chunks[mode];
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channels.min = min(channels.min, pcm_channels);
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channels.max = max(channels.max, pcm_channels);
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}
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return snd_interval_refine(c, &channels);
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}
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static void limit_channels_and_rates(struct snd_motu *motu,
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struct snd_pcm_runtime *runtime,
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struct snd_motu_packet_format *formats)
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{
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struct snd_pcm_hardware *hw = &runtime->hw;
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unsigned int i, pcm_channels, rate, mode;
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hw->channels_min = UINT_MAX;
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hw->channels_max = 0;
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for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
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rate = snd_motu_clock_rates[i];
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mode = i / 2;
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pcm_channels = formats->fixed_part_pcm_chunks[mode] +
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formats->differed_part_pcm_chunks[mode];
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if (pcm_channels == 0)
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continue;
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hw->rates |= snd_pcm_rate_to_rate_bit(rate);
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hw->channels_min = min(hw->channels_min, pcm_channels);
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hw->channels_max = max(hw->channels_max, pcm_channels);
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}
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snd_pcm_limit_hw_rates(runtime);
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}
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static int init_hw_info(struct snd_motu *motu,
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struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_pcm_hardware *hw = &runtime->hw;
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struct amdtp_stream *stream;
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struct snd_motu_packet_format *formats;
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int err;
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
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hw->formats = SNDRV_PCM_FMTBIT_S32;
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stream = &motu->tx_stream;
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formats = &motu->tx_packet_formats;
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} else {
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hw->formats = SNDRV_PCM_FMTBIT_S32;
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stream = &motu->rx_stream;
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formats = &motu->rx_packet_formats;
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}
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limit_channels_and_rates(motu, runtime, formats);
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err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
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motu_rate_constraint, formats,
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SNDRV_PCM_HW_PARAM_CHANNELS, -1);
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if (err < 0)
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return err;
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err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
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motu_channels_constraint, formats,
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SNDRV_PCM_HW_PARAM_RATE, -1);
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if (err < 0)
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return err;
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return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
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}
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static int pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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const struct snd_motu_protocol *const protocol = motu->spec->protocol;
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enum snd_motu_clock_source src;
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unsigned int rate;
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int err;
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err = snd_motu_stream_lock_try(motu);
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if (err < 0)
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return err;
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mutex_lock(&motu->mutex);
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err = snd_motu_stream_cache_packet_formats(motu);
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if (err < 0)
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goto err_locked;
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err = init_hw_info(motu, substream);
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if (err < 0)
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goto err_locked;
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/*
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* When source of clock is not internal or any PCM streams are running,
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* available sampling rate is limited at current sampling rate.
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*/
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err = protocol->get_clock_source(motu, &src);
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if (err < 0)
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goto err_locked;
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if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
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amdtp_stream_pcm_running(&motu->tx_stream) ||
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amdtp_stream_pcm_running(&motu->rx_stream)) {
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err = protocol->get_clock_rate(motu, &rate);
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if (err < 0)
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goto err_locked;
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substream->runtime->hw.rate_min = rate;
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substream->runtime->hw.rate_max = rate;
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}
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snd_pcm_set_sync(substream);
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mutex_unlock(&motu->mutex);
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return err;
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err_locked:
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mutex_unlock(&motu->mutex);
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snd_motu_stream_lock_release(motu);
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return err;
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}
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static int pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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snd_motu_stream_lock_release(motu);
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return 0;
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}
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static int pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *hw_params)
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{
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struct snd_motu *motu = substream->private_data;
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int err;
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err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
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params_buffer_bytes(hw_params));
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if (err < 0)
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return err;
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if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
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unsigned int rate = params_rate(hw_params);
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mutex_lock(&motu->mutex);
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err = snd_motu_stream_reserve_duplex(motu, rate);
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if (err >= 0)
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++motu->substreams_counter;
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mutex_unlock(&motu->mutex);
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}
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return err;
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}
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static int pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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mutex_lock(&motu->mutex);
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if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
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--motu->substreams_counter;
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snd_motu_stream_stop_duplex(motu);
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mutex_unlock(&motu->mutex);
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return snd_pcm_lib_free_vmalloc_buffer(substream);
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}
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static int capture_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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int err;
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mutex_lock(&motu->mutex);
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err = snd_motu_stream_start_duplex(motu);
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mutex_unlock(&motu->mutex);
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if (err >= 0)
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amdtp_stream_pcm_prepare(&motu->tx_stream);
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return 0;
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}
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static int playback_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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int err;
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mutex_lock(&motu->mutex);
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err = snd_motu_stream_start_duplex(motu);
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mutex_unlock(&motu->mutex);
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if (err >= 0)
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amdtp_stream_pcm_prepare(&motu->rx_stream);
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return err;
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}
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static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_motu *motu = substream->private_data;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_motu *motu = substream->private_data;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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return amdtp_stream_pcm_pointer(&motu->tx_stream);
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}
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static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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return amdtp_stream_pcm_pointer(&motu->rx_stream);
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}
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static int capture_ack(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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return amdtp_stream_pcm_ack(&motu->tx_stream);
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}
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static int playback_ack(struct snd_pcm_substream *substream)
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{
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struct snd_motu *motu = substream->private_data;
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return amdtp_stream_pcm_ack(&motu->rx_stream);
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}
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int snd_motu_create_pcm_devices(struct snd_motu *motu)
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{
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static const struct snd_pcm_ops capture_ops = {
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.open = pcm_open,
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.close = pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pcm_hw_params,
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.hw_free = pcm_hw_free,
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.prepare = capture_prepare,
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.trigger = capture_trigger,
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.pointer = capture_pointer,
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.ack = capture_ack,
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.page = snd_pcm_lib_get_vmalloc_page,
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};
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static const struct snd_pcm_ops playback_ops = {
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.open = pcm_open,
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.close = pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = pcm_hw_params,
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.hw_free = pcm_hw_free,
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.prepare = playback_prepare,
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.trigger = playback_trigger,
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.pointer = playback_pointer,
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.ack = playback_ack,
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.page = snd_pcm_lib_get_vmalloc_page,
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};
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struct snd_pcm *pcm;
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int err;
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err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
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if (err < 0)
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return err;
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pcm->private_data = motu;
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strcpy(pcm->name, motu->card->shortname);
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
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return 0;
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}
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