// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ALSA sequencer MIDI-through client
 * Copyright (c) 1999-2000 by Takashi Iwai <tiwai@suse.de>
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include "seq_clientmgr.h"
#include <sound/initval.h>
#include <sound/asoundef.h>

/*

  Sequencer MIDI-through client

  This gives a simple midi-through client.  All the normal input events
  are redirected to output port immediately.
  The routing can be done via aconnect program in alsa-utils.

  Each client has a static client number 62 (= SNDRV_SEQ_CLIENT_DUMMY).
  If you want to auto-load this module, you may add the following alias
  in your /etc/conf.modules file.

        alias snd-seq-client-62  snd-seq-dummy

  The module is loaded on demand for client 62, or /proc/asound/seq/
  is accessed.  If you don't need this module to be loaded, alias
  snd-seq-client-62 as "off".  This will help modprobe.

  The number of ports to be created can be specified via the module
  parameter "ports".  For example, to create four ports, add the
  following option in a configuration file under /etc/modprobe.d/:

        option snd-seq-dummy ports=4

  The model option "duplex=1" enables duplex operation to the port.
  In duplex mode, a pair of ports are created instead of single port,
  and events are tunneled between pair-ports.  For example, input to
  port A is sent to output port of another port B and vice versa.
  In duplex mode, each port has DUPLEX capability.

 */


MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
MODULE_DESCRIPTION("ALSA sequencer MIDI-through client");
MODULE_LICENSE("GPL");
MODULE_ALIAS("snd-seq-client-" __stringify(SNDRV_SEQ_CLIENT_DUMMY));

static int ports = 1;
static bool duplex;

module_param(ports, int, 0444);
MODULE_PARM_DESC(ports, "number of ports to be created");
module_param(duplex, bool, 0444);
MODULE_PARM_DESC(duplex, "create DUPLEX ports");

struct snd_seq_dummy_port {
        int client;
        int port;
        int duplex;
        int connect;
};

static int my_client = -1;

/*
 * event input callback - just redirect events to subscribers
 */
static int
dummy_input(struct snd_seq_event *ev, int direct, void *private_data,
            int atomic, int hop)
{
        struct snd_seq_dummy_port *p;
        struct snd_seq_event tmpev;

        p = private_data;
        if (ev->source.client == SNDRV_SEQ_CLIENT_SYSTEM ||
            ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
                return 0; /* ignore system messages */
        tmpev = *ev;
        if (p->duplex)
                tmpev.source.port = p->connect;
        else
                tmpev.source.port = p->port;
        tmpev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
        return snd_seq_kernel_client_dispatch(p->client, &tmpev, atomic, hop);
}

/*
 * free_private callback
 */
static void
dummy_free(void *private_data)
{
        kfree(private_data);
}

/*
 * create a port
 */
static struct snd_seq_dummy_port __init *
create_port(int idx, int type)
{
        struct snd_seq_port_info pinfo;
        struct snd_seq_port_callback pcb;
        struct snd_seq_dummy_port *rec;

        if ((rec = kzalloc(sizeof(*rec), GFP_KERNEL)) == NULL)
                return NULL;

        rec->client = my_client;
        rec->duplex = duplex;
        rec->connect = 0;
        memset(&pinfo, 0, sizeof(pinfo));
        pinfo.addr.client = my_client;
        if (duplex)
                sprintf(pinfo.name, "Midi Through Port-%d:%c", idx,
                        (type ? 'B' : 'A'));
        else
                sprintf(pinfo.name, "Midi Through Port-%d", idx);
        pinfo.capability = SNDRV_SEQ_PORT_CAP_READ | SNDRV_SEQ_PORT_CAP_SUBS_READ;
        pinfo.capability |= SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
        if (duplex)
                pinfo.capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
        pinfo.type = SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC
                | SNDRV_SEQ_PORT_TYPE_SOFTWARE
                | SNDRV_SEQ_PORT_TYPE_PORT;
        memset(&pcb, 0, sizeof(pcb));
        pcb.owner = THIS_MODULE;
        pcb.event_input = dummy_input;
        pcb.private_free = dummy_free;
        pcb.private_data = rec;
        pinfo.kernel = &pcb;
        if (snd_seq_kernel_client_ctl(my_client, SNDRV_SEQ_IOCTL_CREATE_PORT, &pinfo) < 0) {
                kfree(rec);
                return NULL;
        }
        rec->port = pinfo.addr.port;
        return rec;
}

/*
 * register client and create ports
 */
static int __init
register_client(void)
{
        struct snd_seq_dummy_port *rec1, *rec2;
        int i;

        if (ports < 1) {
                pr_err("ALSA: seq_dummy: invalid number of ports %d\n", ports);
                return -EINVAL;
        }

        /* create client */
        my_client = snd_seq_create_kernel_client(NULL, SNDRV_SEQ_CLIENT_DUMMY,
                                                 "Midi Through");
        if (my_client < 0)
                return my_client;

        /* create ports */
        for (i = 0; i < ports; i++) {
                rec1 = create_port(i, 0);
                if (rec1 == NULL) {
                        snd_seq_delete_kernel_client(my_client);
                        return -ENOMEM;
                }
                if (duplex) {
                        rec2 = create_port(i, 1);
                        if (rec2 == NULL) {
                                snd_seq_delete_kernel_client(my_client);
                                return -ENOMEM;
                        }
                        rec1->connect = rec2->port;
                        rec2->connect = rec1->port;
                }
        }

        return 0;
}

/*
 * delete client if exists
 */
static void __exit
delete_client(void)
{
        if (my_client >= 0)
                snd_seq_delete_kernel_client(my_client);
}

/*
 *  Init part
 */

static int __init alsa_seq_dummy_init(void)
{
        return register_client();
}

static void __exit alsa_seq_dummy_exit(void)
{
        delete_client();
}

module_init(alsa_seq_dummy_init)
module_exit(alsa_seq_dummy_exit)