kernel-ark/sound/core/seq/seq_dummy.c
Lucas De Marchi 970e248649 Documentation: remove references to /etc/modprobe.conf
Usage of /etc/modprobe.conf file was deprecated by module-init-tools and
is no longer parsed by new kmod tool. References to this file are
replaced in Documentation, comments and Kconfig according to the
context.

There are also some references to the old /etc/modules.conf from 2.4
kernels that are being removed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-30 16:03:15 -07:00

262 lines
6.6 KiB
C

/*
* ALSA sequencer MIDI-through client
* Copyright (c) 1999-2000 by Takashi Iwai <tiwai@suse.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#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;
/*
* unuse callback - send ALL_SOUNDS_OFF and RESET_CONTROLLERS events
* to subscribers.
* Note: this callback is called only after all subscribers are removed.
*/
static int
dummy_unuse(void *private_data, struct snd_seq_port_subscribe *info)
{
struct snd_seq_dummy_port *p;
int i;
struct snd_seq_event ev;
p = private_data;
memset(&ev, 0, sizeof(ev));
if (p->duplex)
ev.source.port = p->connect;
else
ev.source.port = p->port;
ev.dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
ev.type = SNDRV_SEQ_EVENT_CONTROLLER;
for (i = 0; i < 16; i++) {
ev.data.control.channel = i;
ev.data.control.param = MIDI_CTL_ALL_SOUNDS_OFF;
snd_seq_kernel_client_dispatch(p->client, &ev, 0, 0);
ev.data.control.param = MIDI_CTL_RESET_CONTROLLERS;
snd_seq_kernel_client_dispatch(p->client, &ev, 0, 0);
}
return 0;
}
/*
* 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.unuse = dummy_unuse;
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) {
snd_printk(KERN_ERR "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)
{
int err;
snd_seq_autoload_lock();
err = register_client();
snd_seq_autoload_unlock();
return err;
}
static void __exit alsa_seq_dummy_exit(void)
{
delete_client();
}
module_init(alsa_seq_dummy_init)
module_exit(alsa_seq_dummy_exit)