// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Midi Sequencer interface routines.
*
* Copyright (C) 1999 Steve Ratcliffe
* Copyright (c) 1999-2000 Takashi Iwai <[email protected]>
*/
#include "emux_voice.h"
#include <linux/slab.h>
#include <linux/module.h>
/* Prototypes for static functions */
static void free_port(void *private);
static void snd_emux_init_port(struct snd_emux_port *p);
static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info);
static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info);
/*
* MIDI emulation operators
*/
static const struct snd_midi_op emux_ops = {
.note_on = snd_emux_note_on,
.note_off = snd_emux_note_off,
.key_press = snd_emux_key_press,
.note_terminate = snd_emux_terminate_note,
.control = snd_emux_control,
.nrpn = snd_emux_nrpn,
.sysex = snd_emux_sysex,
};
/*
* number of MIDI channels
*/
#define MIDI_CHANNELS 16
/*
* type flags for MIDI sequencer port
*/
#define DEFAULT_MIDI_TYPE (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
SNDRV_SEQ_PORT_TYPE_HARDWARE |\
SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
/*
* Initialise the EMUX Synth by creating a client and registering
* a series of ports.
* Each of the ports will contain the 16 midi channels. Applications
* can connect to these ports to play midi data.
*/
int
snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
{
int i;
struct snd_seq_port_callback pinfo;
char tmpname[64];
emu->client = snd_seq_create_kernel_client(card, index,
"%s WaveTable", emu->name);
if (emu->client < 0) {
dev_err(card->dev, "can't create client\n");
return -ENODEV;
}
if (emu->num_ports <= 0) {
dev_warn(card->dev, "seqports must be greater than zero\n");
emu->num_ports = 1;
} else if (emu->num_ports > SNDRV_EMUX_MAX_PORTS) {
dev_warn(card->dev,
"too many ports. limited max. ports %d\n",
SNDRV_EMUX_MAX_PORTS);
emu->num_ports = SNDRV_EMUX_MAX_PORTS;
}
memset(&pinfo, 0, sizeof(pinfo));
pinfo.owner = THIS_MODULE;
pinfo.use = snd_emux_use;
pinfo.unuse = snd_emux_unuse;
pinfo.event_input = snd_emux_event_input;
for (i = 0; i < emu->num_ports; i++) {
struct snd_emux_port *p;
sprintf(tmpname, "%s Port %d", emu->name, i);
p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
0, &pinfo);
if (!p) {
dev_err(card->dev, "can't create port\n");
return -ENOMEM;
}
p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI;
snd_emux_init_port(p);
emu->ports[i] = p->chset.port;
emu->portptrs[i] = p;
}
return 0;
}
/*
* Detach from the ports that were set up for this synthesizer and
* destroy the kernel client.
*/
void
snd_emux_detach_seq(struct snd_emux *emu)
{
if (emu->voices)
snd_emux_terminate_all(emu);
if (emu->client >= 0) {
snd_seq_delete_kernel_client(emu->client);
emu->client = -1;
}
}
/*
* create a sequencer port and channel_set
*/
struct snd_emux_port *
snd_emux_create_port(struct snd_emux *emu, char *name,
int max_channels, int oss_port,
struct snd_seq_port_callback *callback)
{
struct snd_emux_port *p;
int i, type, cap;
/* Allocate structures for this channel */
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return NULL;
p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels),
GFP_KERNEL);
if (!p->chset.channels) {
kfree(p);
return NULL;
}
for (i = 0; i < max_channels; i++)
p->chset.channels[i].number = i;
p->chset.private_data = p;
p->chset.max_channels = max_channels;
p->emu = emu;
p->chset.client = emu->client;
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
snd_emux_create_effect(p);
#endif
callback->private_free = free_port;
callback->private_data = p;
cap = SNDRV_SEQ_PORT_CAP_WRITE;
if (oss_port) {
type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
} else {
type = DEFAULT_MIDI_TYPE;
cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
}
p->chset.port = snd_seq_event_port_attach(emu->client, callback,
cap, type, max_channels,
emu->max_voices, name);
return p;
}
/*
* release memory block for port
*/
static void
free_port(void *private_data)
{
struct snd_emux_port *p;
p = private_data;
if (p) {
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
snd_emux_delete_effect(p);
#endif
kfree(p->chset.channels);
kfree(p);
}
}
#define DEFAULT_DRUM_FLAGS (1<<9)
/*
* initialize the port specific parameters
*/
static void
snd_emux_init_port(struct snd_emux_port *p)
{
p->drum_flags = DEFAULT_DRUM_FLAGS;
p->volume_atten = 0;
snd_emux_reset_port(p);
}
/*
* reset port
*/
void
snd_emux_reset_port(struct snd_emux_port *port)
{
int i;
/* stop all sounds */
snd_emux_sounds_off_all(port);
snd_midi_channel_set_clear(&port->chset);
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
snd_emux_clear_effect(port);
#endif
/* set port specific control parameters */
port->ctrls[EMUX_MD_DEF_BANK] = 0;
port->ctrls[EMUX_MD_DEF_DRUM] = 0;
port->ctrls[EMUX_MD_REALTIME_PAN] = 1;
for (i = 0; i < port->chset.max_channels; i++) {
struct snd_midi_channel *chan = port->chset.channels + i;
chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
}
}
/*
* input sequencer event
*/
int
snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
int atomic, int hop)
{
struct snd_emux_port *port;
port = private_data;
if (snd_BUG_ON(!port || !ev))
return -EINVAL;
snd_midi_process_event(&emux_ops, ev, &port->chset);
return 0;
}
/*
* increment usage count
*/
static int
__snd_emux_inc_count(struct snd_emux *emu)
{
emu->used++;
if (!try_module_get(emu->ops.owner))
goto __error;
if (!try_module_get(emu->card->module)) {
module_put(emu->ops.owner);
__error:
emu->used--;
return 0;
}
return 1;
}
int snd_emux_inc_count(struct snd_emux *emu)
{
int ret;
mutex_lock(&emu->register_mutex);
ret = __snd_emux_inc_count(emu);
mutex_unlock(&emu->register_mutex);
return ret;
}
/*
* decrease usage count
*/
static void
__snd_emux_dec_count(struct snd_emux *emu)
{
module_put(emu->card->module);
emu->used--;
if (emu->used <= 0)
snd_emux_terminate_all(emu);
module_put(emu->ops.owner);
}
void snd_emux_dec_count(struct snd_emux *emu)
{
mutex_lock(&emu->register_mutex);
__snd_emux_dec_count(emu);
mutex_unlock(&emu->register_mutex);
}
/*
* Routine that is called upon a first use of a particular port
*/
static int
snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
{
struct snd_emux_port *p;
struct snd_emux *emu;
p = private_data;
if (snd_BUG_ON(!p))
return -EINVAL;
emu = p->emu;
if (snd_BUG_ON(!emu))
return -EINVAL;
mutex_lock(&emu->register_mutex);
snd_emux_init_port(p);
__snd_emux_inc_count(emu);
mutex_unlock(&emu->register_mutex);
return 0;
}
/*
* Routine that is called upon the last unuse() of a particular port.
*/
static int
snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
{
struct snd_emux_port *p;
struct snd_emux *emu;
p = private_data;
if (snd_BUG_ON(!p))
return -EINVAL;
emu = p->emu;
if (snd_BUG_ON(!emu))
return -EINVAL;
mutex_lock(&emu->register_mutex);
snd_emux_sounds_off_all(p);
__snd_emux_dec_count(emu);
mutex_unlock(&emu->register_mutex);
return 0;
}
/*
* attach virtual rawmidi devices
*/
int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
{
int i;
emu->vmidi = NULL;
if (emu->midi_ports <= 0)
return 0;
emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL);
if (!emu->vmidi)
return -ENOMEM;
for (i = 0; i < emu->midi_ports; i++) {
struct snd_rawmidi *rmidi;
struct snd_virmidi_dev *rdev;
if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
goto __error;
rdev = rmidi->private_data;
sprintf(rmidi->name, "%s Synth MIDI", emu->name);
rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
rdev->client = emu->client;
rdev->port = emu->ports[i];
if (snd_device_register(card, rmidi) < 0) {
snd_device_free(card, rmidi);
goto __error;
}
emu->vmidi[i] = rmidi;
}
return 0;
__error:
snd_emux_delete_virmidi(emu);
return -ENOMEM;
}
int snd_emux_delete_virmidi(struct snd_emux *emu)
{
int i;
if (!emu->vmidi)
return 0;
for (i = 0; i < emu->midi_ports; i++) {
if (emu->vmidi[i])
snd_device_free(emu->card, emu->vmidi[i]);
}
kfree(emu->vmidi);
emu->vmidi = NULL;
return 0;
}
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