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0f5482e787
This commit allows ALSA firewire-motu driver to share PCM buffer size for both capture and playback PCM substream. When AMDTP domain starts for one of the PCM substream, buffer size of the PCM substream is stores to AMDTP domain structure. Some AMDTP streams have already run with the buffer size when another PCM substream starts, therefore the PCM substream has a constraint to its buffer size. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191017155424.885-9-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* motu-midi.h - 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 "motu.h"
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static int midi_open(struct snd_rawmidi_substream *substream)
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{
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struct snd_motu *motu = substream->rmidi->private_data;
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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_reserve_duplex(motu, 0, 0, 0);
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if (err >= 0) {
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++motu->substreams_counter;
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err = snd_motu_stream_start_duplex(motu);
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if (err < 0)
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--motu->substreams_counter;
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}
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mutex_unlock(&motu->mutex);
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if (err < 0)
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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 midi_close(struct snd_rawmidi_substream *substream)
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{
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struct snd_motu *motu = substream->rmidi->private_data;
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mutex_lock(&motu->mutex);
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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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snd_motu_stream_lock_release(motu);
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return 0;
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}
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static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
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{
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struct snd_motu *motu = substrm->rmidi->private_data;
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unsigned long flags;
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spin_lock_irqsave(&motu->lock, flags);
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if (up)
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amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
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substrm);
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else
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amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
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NULL);
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spin_unlock_irqrestore(&motu->lock, flags);
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}
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static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
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{
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struct snd_motu *motu = substrm->rmidi->private_data;
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unsigned long flags;
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spin_lock_irqsave(&motu->lock, flags);
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if (up)
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amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
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substrm);
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else
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amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
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NULL);
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spin_unlock_irqrestore(&motu->lock, flags);
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}
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static void set_midi_substream_names(struct snd_motu *motu,
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struct snd_rawmidi_str *str)
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{
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struct snd_rawmidi_substream *subs;
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list_for_each_entry(subs, &str->substreams, list) {
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snprintf(subs->name, sizeof(subs->name),
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"%s MIDI %d", motu->card->shortname, subs->number + 1);
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}
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}
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int snd_motu_create_midi_devices(struct snd_motu *motu)
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{
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static const struct snd_rawmidi_ops capture_ops = {
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.open = midi_open,
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.close = midi_close,
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.trigger = midi_capture_trigger,
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};
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static const struct snd_rawmidi_ops playback_ops = {
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.open = midi_open,
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.close = midi_close,
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.trigger = midi_playback_trigger,
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};
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struct snd_rawmidi *rmidi;
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struct snd_rawmidi_str *str;
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int err;
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/* create midi ports */
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err = snd_rawmidi_new(motu->card, motu->card->driver, 0, 1, 1, &rmidi);
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if (err < 0)
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return err;
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snprintf(rmidi->name, sizeof(rmidi->name),
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"%s MIDI", motu->card->shortname);
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rmidi->private_data = motu;
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT |
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SNDRV_RAWMIDI_INFO_OUTPUT |
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SNDRV_RAWMIDI_INFO_DUPLEX;
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
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&capture_ops);
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str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
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set_midi_substream_names(motu, str);
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
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&playback_ops);
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str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
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set_midi_substream_names(motu, str);
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return 0;
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}
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