// SPDX-License-Identifier: GPL-2.0-only
/*
 * tascam-midi.c - a part of driver for TASCAM FireWire series
 *
 * Copyright (c) 2015 Takashi Sakamoto
 */

#include "tascam.h"

static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
        /* Do nothing. */
        return 0;
}

static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
        struct snd_tscm *tscm = substream->rmidi->private_data;

        snd_fw_async_midi_port_init(&tscm->out_ports[substream->number]);

        return 0;
}

static int midi_capture_close(struct snd_rawmidi_substream *substream)
{
        /* Do nothing. */
        return 0;
}

static int midi_playback_close(struct snd_rawmidi_substream *substream)
{
        return 0;
}

static void midi_playback_drain(struct snd_rawmidi_substream *substream)
{
        struct snd_tscm *tscm = substream->rmidi->private_data;

        snd_fw_async_midi_port_finish(&tscm->out_ports[substream->number]);
}

static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
{
        struct snd_tscm *tscm = substrm->rmidi->private_data;

        guard(spinlock_irqsave)(&tscm->lock);

        if (up)
                tscm->tx_midi_substreams[substrm->number] = substrm;
        else
                tscm->tx_midi_substreams[substrm->number] = NULL;
}

static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
{
        struct snd_tscm *tscm = substrm->rmidi->private_data;

        guard(spinlock_irqsave)(&tscm->lock);

        if (up)
                snd_fw_async_midi_port_run(&tscm->out_ports[substrm->number],
                                           substrm);
}

int snd_tscm_create_midi_devices(struct snd_tscm *tscm)
{
        static const struct snd_rawmidi_ops capture_ops = {
                .open           = midi_capture_open,
                .close          = midi_capture_close,
                .trigger        = midi_capture_trigger,
        };
        static const struct snd_rawmidi_ops playback_ops = {
                .open           = midi_playback_open,
                .close          = midi_playback_close,
                .drain          = midi_playback_drain,
                .trigger        = midi_playback_trigger,
        };
        struct snd_rawmidi *rmidi;
        struct snd_rawmidi_str *stream;
        struct snd_rawmidi_substream *subs;
        int err;

        err = snd_rawmidi_new(tscm->card, tscm->card->driver, 0,
                              tscm->spec->midi_playback_ports,
                              tscm->spec->midi_capture_ports,
                              &rmidi);
        if (err < 0)
                return err;

        snprintf(rmidi->name, sizeof(rmidi->name),
                 "%s MIDI", tscm->card->shortname);
        rmidi->private_data = tscm;

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
                            &capture_ops);
        stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];

        /* Set port names for MIDI input. */
        list_for_each_entry(subs, &stream->substreams, list) {
                /* TODO: support virtual MIDI ports. */
                if (subs->number < tscm->spec->midi_capture_ports) {
                        /* Hardware MIDI ports. */
                        scnprintf(subs->name, sizeof(subs->name),
                                  "%s MIDI %d",
                                  tscm->card->shortname, subs->number + 1);
                }
        }

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
                            &playback_ops);
        stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];

        /* Set port names for MIDI ourput. */
        list_for_each_entry(subs, &stream->substreams, list) {
                if (subs->number < tscm->spec->midi_playback_ports) {
                        /* Hardware MIDI ports only. */
                        scnprintf(subs->name, sizeof(subs->name),
                                  "%s MIDI %d",
                                  tscm->card->shortname, subs->number + 1);
                }
        }

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;

        return 0;
}