// SPDX-License-Identifier: GPL-2.0-only
/*
 * ff-midi.c - a part of driver for RME Fireface series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto
 */

#include "ff.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_ff *ff = substream->rmidi->private_data;

        /* Initialize internal status. */
        ff->on_sysex[substream->number] = 0;
        ff->rx_midi_error[substream->number] = false;

        WRITE_ONCE(ff->rx_midi_substreams[substream->number], substream);

        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)
{
        struct snd_ff *ff = substream->rmidi->private_data;

        cancel_work_sync(&ff->rx_midi_work[substream->number]);
        WRITE_ONCE(ff->rx_midi_substreams[substream->number], NULL);

        return 0;
}

static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
                                 int up)
{
        struct snd_ff *ff = substream->rmidi->private_data;

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

        if (up)
                WRITE_ONCE(ff->tx_midi_substreams[substream->number],
                           substream);
        else
                WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
}

static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
                                  int up)
{
        struct snd_ff *ff = substream->rmidi->private_data;

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

        if (up || !ff->rx_midi_error[substream->number])
                schedule_work(&ff->rx_midi_work[substream->number]);
}

static void set_midi_substream_names(struct snd_rawmidi_str *stream,
                                     const char *const name)
{
        struct snd_rawmidi_substream *substream;

        list_for_each_entry(substream, &stream->substreams, list) {
                scnprintf(substream->name, sizeof(substream->name),
                          "%s MIDI %d", name, substream->number + 1);
        }
}

int snd_ff_create_midi_devices(struct snd_ff *ff)
{
        static const struct snd_rawmidi_ops midi_capture_ops = {
                .open           = midi_capture_open,
                .close          = midi_capture_close,
                .trigger        = midi_capture_trigger,
        };
        static const struct snd_rawmidi_ops midi_playback_ops = {
                .open           = midi_playback_open,
                .close          = midi_playback_close,
                .trigger        = midi_playback_trigger,
        };
        struct snd_rawmidi *rmidi;
        struct snd_rawmidi_str *stream;
        int err;

        err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
                              ff->spec->midi_out_ports, ff->spec->midi_in_ports,
                              &rmidi);
        if (err < 0)
                return err;

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

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
                            &midi_capture_ops);
        stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
        set_midi_substream_names(stream, ff->card->shortname);

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
                            &midi_playback_ops);
        stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
        set_midi_substream_names(stream, ff->card->shortname);

        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;

        return 0;
}