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Once allocated, isochronous resources are available for packet streaming, even if the streaming is cancelled. For this reason, current implementation handles allocation of the resources and starting packet streaming at the same time. However, this brings complicated procedure to start packet streaming. This commit separates the allocation and starting. The allocation is done in pcm.hw_params callback and available till pcm.hw_free callback. Even if any XRUN occurs, pcm.prepare callback is done to restart packet streaming without releasing/allocating the resources. There are two points to stop packet streaming; in pcm.hw_params and pcm.prepare callbacks. The former point is a case that packet streaming is already started for any MIDI substream then packet streaming is requested with different sampling transfer frequency for any PCM substream. The latter point is cases of any XRUN or packet queueing error. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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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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* Licensed under the terms of the GNU General Public License, version 2.
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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);
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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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}
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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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snd_motu_stream_release_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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