// SPDX-License-Identifier: GPL-2.0-only
/*
 * oxfw_midi.c - a part of driver for OXFW970/971 based devices
 *
 * Copyright (c) 2014 Takashi Sakamoto
 */

#include "oxfw.h"

static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
        struct snd_oxfw *oxfw = substream->rmidi->private_data;
        int err;

        err = snd_oxfw_stream_lock_try(oxfw);
        if (err < 0)
                return err;

        scoped_guard(mutex, &oxfw->mutex) {
                err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->tx_stream, 0, 0, 0, 0);
                if (err >= 0) {
                        ++oxfw->substreams_count;
                        err = snd_oxfw_stream_start_duplex(oxfw);
                        if (err < 0)
                                --oxfw->substreams_count;
                }
        }

        if (err < 0)
                snd_oxfw_stream_lock_release(oxfw);

        return err;
}

static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
        struct snd_oxfw *oxfw = substream->rmidi->private_data;
        int err;

        err = snd_oxfw_stream_lock_try(oxfw);
        if (err < 0)
                return err;

        scoped_guard(mutex, &oxfw->mutex) {
                err = snd_oxfw_stream_reserve_duplex(oxfw, &oxfw->rx_stream, 0, 0, 0, 0);
                if (err >= 0) {
                        ++oxfw->substreams_count;
                        err = snd_oxfw_stream_start_duplex(oxfw);
                }
        }

        if (err < 0)
                snd_oxfw_stream_lock_release(oxfw);

        return err;
}

static int midi_capture_close(struct snd_rawmidi_substream *substream)
{
        struct snd_oxfw *oxfw = substream->rmidi->private_data;

        scoped_guard(mutex, &oxfw->mutex) {
                --oxfw->substreams_count;
                snd_oxfw_stream_stop_duplex(oxfw);
        }

        snd_oxfw_stream_lock_release(oxfw);
        return 0;
}

static int midi_playback_close(struct snd_rawmidi_substream *substream)
{
        struct snd_oxfw *oxfw = substream->rmidi->private_data;

        scoped_guard(mutex, &oxfw->mutex) {
                --oxfw->substreams_count;
                snd_oxfw_stream_stop_duplex(oxfw);
        }

        snd_oxfw_stream_lock_release(oxfw);
        return 0;
}

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

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

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

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

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

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

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

int snd_oxfw_create_midi(struct snd_oxfw *oxfw)
{
        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,
                .trigger        = midi_playback_trigger,
        };
        struct snd_rawmidi *rmidi;
        struct snd_rawmidi_str *str;
        int err;

        if (oxfw->midi_input_ports == 0 && oxfw->midi_output_ports == 0)
                return 0;

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

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

        if (oxfw->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(oxfw, str);
        }

        if (oxfw->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(oxfw, str);
        }

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

        return 0;
}