// SPDX-License-Identifier: GPL-2.0-only
/*
 * motu-midi.h - a part of driver for MOTU FireWire series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
 */
#include "motu.h"

static int midi_open(struct snd_rawmidi_substream *substream)
{
        struct snd_motu *motu = substream->rmidi->private_data;
        int err;

        err = snd_motu_stream_lock_try(motu);
        if (err < 0)
                return err;

        scoped_guard(mutex, &motu->mutex) {
                err = snd_motu_stream_reserve_duplex(motu, 0, 0, 0);
                if (err >= 0) {
                        ++motu->substreams_counter;
                        err = snd_motu_stream_start_duplex(motu);
                        if (err < 0)
                                --motu->substreams_counter;
                }
        }

        if (err < 0)
                snd_motu_stream_lock_release(motu);

        return err;
}

static int midi_close(struct snd_rawmidi_substream *substream)
{
        struct snd_motu *motu = substream->rmidi->private_data;

        scoped_guard(mutex, &motu->mutex) {
                --motu->substreams_counter;
                snd_motu_stream_stop_duplex(motu);
        }

        snd_motu_stream_lock_release(motu);
        return 0;
}

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

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

        if (up)
                amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
                                        substrm);
        else
                amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
                                        NULL);
}

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

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

        if (up)
                amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
                                        substrm);
        else
                amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
                                        NULL);
}

static void set_midi_substream_names(struct snd_motu *motu,
                                     struct snd_rawmidi_str *str)
{
        struct snd_rawmidi_substream *subs;

        list_for_each_entry(subs, &str->substreams, list) {
                scnprintf(subs->name, sizeof(subs->name),
                          "%s MIDI %d", motu->card->shortname, subs->number + 1);
        }
}

int snd_motu_create_midi_devices(struct snd_motu *motu)
{
        static const struct snd_rawmidi_ops capture_ops = {
                .open           = midi_open,
                .close          = midi_close,
                .trigger        = midi_capture_trigger,
        };
        static const struct snd_rawmidi_ops playback_ops = {
                .open           = midi_open,
                .close          = midi_close,
                .trigger        = midi_playback_trigger,
        };
        struct snd_rawmidi *rmidi;
        struct snd_rawmidi_str *str;
        int err;

        /* create midi ports */
        err = snd_rawmidi_new(motu->card, motu->card->driver, 0, 1, 1, &rmidi);
        if (err < 0)
                return err;

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

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT |
                             SNDRV_RAWMIDI_INFO_OUTPUT |
                             SNDRV_RAWMIDI_INFO_DUPLEX;

        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
                            &capture_ops);
        str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
        set_midi_substream_names(motu, str);

        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
                            &playback_ops);
        str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
        set_midi_substream_names(motu, str);

        return 0;
}