// SPDX-License-Identifier: GPL-2.0-only
/*
 * bebob_midi.c - a part of driver for BeBoB based devices
 *
 * Copyright (c) 2013-2014 Takashi Sakamoto
 */

#include "bebob.h"

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

        err = snd_bebob_stream_lock_try(bebob);
        if (err < 0)
                return err;

        scoped_guard(mutex, &bebob->mutex) {
                err = snd_bebob_stream_reserve_duplex(bebob, 0, 0, 0);
                if (err >= 0) {
                        ++bebob->substreams_counter;
                        err = snd_bebob_stream_start_duplex(bebob);
                        if (err < 0)
                                --bebob->substreams_counter;
                }
        }
        if (err < 0)
                snd_bebob_stream_lock_release(bebob);

        return err;
}

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

        scoped_guard(mutex, &bebob->mutex) {
                bebob->substreams_counter--;
                snd_bebob_stream_stop_duplex(bebob);
        }

        snd_bebob_stream_lock_release(bebob);
        return 0;
}

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

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

        if (up)
                amdtp_am824_midi_trigger(&bebob->tx_stream,
                                         substrm->number, substrm);
        else
                amdtp_am824_midi_trigger(&bebob->tx_stream,
                                         substrm->number, NULL);
}

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

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

        if (up)
                amdtp_am824_midi_trigger(&bebob->rx_stream,
                                         substrm->number, substrm);
        else
                amdtp_am824_midi_trigger(&bebob->rx_stream,
                                         substrm->number, NULL);
}

static void set_midi_substream_names(struct snd_bebob *bebob,
                                     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",
                          bebob->card->shortname, subs->number + 1);
        }
}

int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
{
        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(bebob->card, bebob->card->driver, 0,
                              bebob->midi_output_ports, bebob->midi_input_ports,
                              &rmidi);
        if (err < 0)
                return err;

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

        if (bebob->midi_input_ports > 0) {
                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;

                snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
                                    &capture_ops);

                str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];

                set_midi_substream_names(bebob, str);
        }

        if (bebob->midi_output_ports > 0) {
                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;

                snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
                                    &playback_ops);

                str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];

                set_midi_substream_names(bebob, str);
        }

        if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;

        return 0;
}