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1fde7a447a
This commit allows ALSA bebob 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/20191017155424.885-3-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* bebob_midi.c - a part of driver for BeBoB based devices
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*
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* Copyright (c) 2013-2014 Takashi Sakamoto
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*/
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#include "bebob.h"
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static int midi_open(struct snd_rawmidi_substream *substream)
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{
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struct snd_bebob *bebob = substream->rmidi->private_data;
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int err;
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err = snd_bebob_stream_lock_try(bebob);
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if (err < 0)
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return err;
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mutex_lock(&bebob->mutex);
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err = snd_bebob_stream_reserve_duplex(bebob, 0, 0, 0);
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if (err >= 0) {
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++bebob->substreams_counter;
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err = snd_bebob_stream_start_duplex(bebob);
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if (err < 0)
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--bebob->substreams_counter;
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}
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mutex_unlock(&bebob->mutex);
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if (err < 0)
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snd_bebob_stream_lock_release(bebob);
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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_bebob *bebob = substream->rmidi->private_data;
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mutex_lock(&bebob->mutex);
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bebob->substreams_counter--;
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snd_bebob_stream_stop_duplex(bebob);
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mutex_unlock(&bebob->mutex);
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snd_bebob_stream_lock_release(bebob);
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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_bebob *bebob = substrm->rmidi->private_data;
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unsigned long flags;
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spin_lock_irqsave(&bebob->lock, flags);
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if (up)
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amdtp_am824_midi_trigger(&bebob->tx_stream,
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substrm->number, substrm);
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else
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amdtp_am824_midi_trigger(&bebob->tx_stream,
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substrm->number, NULL);
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spin_unlock_irqrestore(&bebob->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_bebob *bebob = substrm->rmidi->private_data;
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unsigned long flags;
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spin_lock_irqsave(&bebob->lock, flags);
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if (up)
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amdtp_am824_midi_trigger(&bebob->rx_stream,
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substrm->number, substrm);
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else
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amdtp_am824_midi_trigger(&bebob->rx_stream,
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substrm->number, NULL);
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spin_unlock_irqrestore(&bebob->lock, flags);
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}
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static void set_midi_substream_names(struct snd_bebob *bebob,
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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",
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bebob->card->shortname, subs->number + 1);
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}
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}
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int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
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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(bebob->card, bebob->card->driver, 0,
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bebob->midi_output_ports, bebob->midi_input_ports,
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&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", bebob->card->shortname);
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rmidi->private_data = bebob;
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if (bebob->midi_input_ports > 0) {
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
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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(bebob, str);
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}
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if (bebob->midi_output_ports > 0) {
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
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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(bebob, str);
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}
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if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
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return 0;
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}
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