// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OSS compatible sequencer driver
*
* open/close and reset interface
*
* Copyright (C) 1998-1999 Takashi Iwai <[email protected]>
*/
#include "seq_oss_device.h"
#include "seq_oss_synth.h"
#include "seq_oss_midi.h"
#include "seq_oss_writeq.h"
#include "seq_oss_readq.h"
#include "seq_oss_timer.h"
#include "seq_oss_event.h"
#include <linux/init.h>
#include <linux/export.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
/*
* common variables
*/
static int maxqlen = SNDRV_SEQ_OSS_MAX_QLEN;
module_param(maxqlen, int, 0444);
MODULE_PARM_DESC(maxqlen, "maximum queue length");
static int system_client = -1; /* ALSA sequencer client number */
static int system_port = -1;
static int num_clients;
static struct seq_oss_devinfo *client_table[SNDRV_SEQ_OSS_MAX_CLIENTS];
/*
* prototypes
*/
static int receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic, int hop);
static int translate_mode(struct file *file);
static int create_port(struct seq_oss_devinfo *dp);
static int delete_port(struct seq_oss_devinfo *dp);
static int alloc_seq_queue(struct seq_oss_devinfo *dp);
static int delete_seq_queue(int queue);
static void free_devinfo(void *private);
#define call_ctl(type,rec) snd_seq_kernel_client_ctl(system_client, type, rec)
/* call snd_seq_oss_midi_lookup_ports() asynchronously */
static void async_call_lookup_ports(struct work_struct *work)
{
snd_seq_oss_midi_lookup_ports(system_client);
}
static DECLARE_WORK(async_lookup_work, async_call_lookup_ports);
/*
* create sequencer client for OSS sequencer
*/
int __init
snd_seq_oss_create_client(void)
{
int rc;
struct snd_seq_port_info *port __free(kfree) = NULL;
struct snd_seq_port_callback port_callback;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
/* create ALSA client */
rc = snd_seq_create_kernel_client(NULL, SNDRV_SEQ_CLIENT_OSS,
"OSS sequencer");
if (rc < 0)
return rc;
system_client = rc;
/* create announcement receiver port */
strcpy(port->name, "Receiver");
port->addr.client = system_client;
port->capability = SNDRV_SEQ_PORT_CAP_WRITE; /* receive only */
port->type = 0;
memset(&port_callback, 0, sizeof(port_callback));
/* don't set port_callback.owner here. otherwise the module counter
* is incremented and we can no longer release the module..
*/
port_callback.event_input = receive_announce;
port->kernel = &port_callback;
if (call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, port) >= 0) {
struct snd_seq_port_subscribe subs;
system_port = port->addr.port;
memset(&subs, 0, sizeof(subs));
subs.sender.client = SNDRV_SEQ_CLIENT_SYSTEM;
subs.sender.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
subs.dest.client = system_client;
subs.dest.port = system_port;
call_ctl(SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs);
}
/* look up midi devices */
schedule_work(&async_lookup_work);
return 0;
}
/*
* receive annoucement from system port, and check the midi device
*/
static int
receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic, int hop)
{
struct snd_seq_port_info pinfo;
if (atomic)
return 0; /* it must not happen */
switch (ev->type) {
case SNDRV_SEQ_EVENT_PORT_START:
case SNDRV_SEQ_EVENT_PORT_CHANGE:
if (ev->data.addr.client == system_client)
break; /* ignore myself */
memset(&pinfo, 0, sizeof(pinfo));
pinfo.addr = ev->data.addr;
if (call_ctl(SNDRV_SEQ_IOCTL_GET_PORT_INFO, &pinfo) >= 0)
snd_seq_oss_midi_check_new_port(&pinfo);
break;
case SNDRV_SEQ_EVENT_PORT_EXIT:
if (ev->data.addr.client == system_client)
break; /* ignore myself */
snd_seq_oss_midi_check_exit_port(ev->data.addr.client,
ev->data.addr.port);
break;
}
return 0;
}
/*
* delete OSS sequencer client
*/
int
snd_seq_oss_delete_client(void)
{
cancel_work_sync(&async_lookup_work);
if (system_client >= 0)
snd_seq_delete_kernel_client(system_client);
snd_seq_oss_midi_clear_all();
return 0;
}
/*
* open sequencer device
*/
int
snd_seq_oss_open(struct file *file, int level)
{
int i, rc;
struct seq_oss_devinfo *dp;
dp = kzalloc(sizeof(*dp), GFP_KERNEL);
if (!dp)
return -ENOMEM;
dp->cseq = system_client;
dp->port = -1;
dp->queue = -1;
for (i = 0; i < SNDRV_SEQ_OSS_MAX_CLIENTS; i++) {
if (client_table[i] == NULL)
break;
}
dp->index = i;
if (i >= SNDRV_SEQ_OSS_MAX_CLIENTS) {
pr_debug("ALSA: seq_oss: too many applications\n");
rc = -ENOMEM;
goto _error;
}
/* look up synth and midi devices */
snd_seq_oss_synth_setup(dp);
snd_seq_oss_midi_setup(dp);
if (dp->synth_opened == 0 && dp->max_mididev == 0) {
/* pr_err("ALSA: seq_oss: no device found\n"); */
rc = -ENODEV;
goto _error;
}
/* create port */
rc = create_port(dp);
if (rc < 0) {
pr_err("ALSA: seq_oss: can't create port\n");
goto _error;
}
/* allocate queue */
rc = alloc_seq_queue(dp);
if (rc < 0)
goto _error;
/* set address */
dp->addr.client = dp->cseq;
dp->addr.port = dp->port;
/*dp->addr.queue = dp->queue;*/
/*dp->addr.channel = 0;*/
dp->seq_mode = level;
/* set up file mode */
dp->file_mode = translate_mode(file);
/* initialize read queue */
if (is_read_mode(dp->file_mode)) {
dp->readq = snd_seq_oss_readq_new(dp, maxqlen);
if (!dp->readq) {
rc = -ENOMEM;
goto _error;
}
}
/* initialize write queue */
if (is_write_mode(dp->file_mode)) {
dp->writeq = snd_seq_oss_writeq_new(dp, maxqlen);
if (!dp->writeq) {
rc = -ENOMEM;
goto _error;
}
}
/* initialize timer */
dp->timer = snd_seq_oss_timer_new(dp);
if (!dp->timer) {
pr_err("ALSA: seq_oss: can't alloc timer\n");
rc = -ENOMEM;
goto _error;
}
/* set private data pointer */
file->private_data = dp;
/* set up for mode2 */
if (level == SNDRV_SEQ_OSS_MODE_MUSIC)
snd_seq_oss_synth_setup_midi(dp);
else if (is_read_mode(dp->file_mode))
snd_seq_oss_midi_open_all(dp, SNDRV_SEQ_OSS_FILE_READ);
client_table[dp->index] = dp;
num_clients++;
return 0;
_error:
snd_seq_oss_synth_cleanup(dp);
snd_seq_oss_midi_cleanup(dp);
delete_seq_queue(dp->queue);
delete_port(dp);
return rc;
}
/*
* translate file flags to private mode
*/
static int
translate_mode(struct file *file)
{
int file_mode = 0;
if ((file->f_flags & O_ACCMODE) != O_RDONLY)
file_mode |= SNDRV_SEQ_OSS_FILE_WRITE;
if ((file->f_flags & O_ACCMODE) != O_WRONLY)
file_mode |= SNDRV_SEQ_OSS_FILE_READ;
if (file->f_flags & O_NONBLOCK)
file_mode |= SNDRV_SEQ_OSS_FILE_NONBLOCK;
return file_mode;
}
/*
* create sequencer port
*/
static int
create_port(struct seq_oss_devinfo *dp)
{
int rc;
struct snd_seq_port_info port;
struct snd_seq_port_callback callback;
memset(&port, 0, sizeof(port));
port.addr.client = dp->cseq;
sprintf(port.name, "Sequencer-%d", dp->index);
port.capability = SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_WRITE; /* no subscription */
port.type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
port.midi_channels = 128;
port.synth_voices = 128;
memset(&callback, 0, sizeof(callback));
callback.owner = THIS_MODULE;
callback.private_data = dp;
callback.event_input = snd_seq_oss_event_input;
callback.private_free = free_devinfo;
port.kernel = &callback;
rc = call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, &port);
if (rc < 0)
return rc;
dp->port = port.addr.port;
return 0;
}
/*
* delete ALSA port
*/
static int
delete_port(struct seq_oss_devinfo *dp)
{
if (dp->port < 0) {
kfree(dp);
return 0;
}
return snd_seq_event_port_detach(dp->cseq, dp->port);
}
/*
* allocate a queue
*/
static int
alloc_seq_queue(struct seq_oss_devinfo *dp)
{
struct snd_seq_queue_info qinfo;
int rc;
memset(&qinfo, 0, sizeof(qinfo));
qinfo.owner = system_client;
qinfo.locked = 1;
strcpy(qinfo.name, "OSS Sequencer Emulation");
rc = call_ctl(SNDRV_SEQ_IOCTL_CREATE_QUEUE, &qinfo);
if (rc < 0)
return rc;
dp->queue = qinfo.queue;
return 0;
}
/*
* release queue
*/
static int
delete_seq_queue(int queue)
{
struct snd_seq_queue_info qinfo;
int rc;
if (queue < 0)
return 0;
memset(&qinfo, 0, sizeof(qinfo));
qinfo.queue = queue;
rc = call_ctl(SNDRV_SEQ_IOCTL_DELETE_QUEUE, &qinfo);
if (rc < 0)
pr_err("ALSA: seq_oss: unable to delete queue %d (%d)\n", queue, rc);
return rc;
}
/*
* free device informations - private_free callback of port
*/
static void
free_devinfo(void *private)
{
struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private;
snd_seq_oss_timer_delete(dp->timer);
snd_seq_oss_writeq_delete(dp->writeq);
snd_seq_oss_readq_delete(dp->readq);
kfree(dp);
}
/*
* close sequencer device
*/
void
snd_seq_oss_release(struct seq_oss_devinfo *dp)
{
int queue;
client_table[dp->index] = NULL;
num_clients--;
snd_seq_oss_reset(dp);
snd_seq_oss_synth_cleanup(dp);
snd_seq_oss_midi_cleanup(dp);
/* clear slot */
queue = dp->queue;
if (dp->port >= 0)
delete_port(dp);
delete_seq_queue(queue);
}
/*
* reset sequencer devices
*/
void
snd_seq_oss_reset(struct seq_oss_devinfo *dp)
{
int i;
/* reset all synth devices */
for (i = 0; i < dp->max_synthdev; i++)
snd_seq_oss_synth_reset(dp, i);
/* reset all midi devices */
if (dp->seq_mode != SNDRV_SEQ_OSS_MODE_MUSIC) {
for (i = 0; i < dp->max_mididev; i++)
snd_seq_oss_midi_reset(dp, i);
}
/* remove queues */
if (dp->readq)
snd_seq_oss_readq_clear(dp->readq);
if (dp->writeq)
snd_seq_oss_writeq_clear(dp->writeq);
/* reset timer */
snd_seq_oss_timer_stop(dp->timer);
}
#ifdef CONFIG_SND_PROC_FS
/*
* misc. functions for proc interface
*/
char *
enabled_str(bool b)
{
return b ? "enabled" : "disabled";
}
static const char *
filemode_str(int val)
{
static const char * const str[] = {
"none", "read", "write", "read/write",
};
return str[val & SNDRV_SEQ_OSS_FILE_ACMODE];
}
/*
* proc interface
*/
void
snd_seq_oss_system_info_read(struct snd_info_buffer *buf)
{
int i;
struct seq_oss_devinfo *dp;
snd_iprintf(buf, "ALSA client number %d\n", system_client);
snd_iprintf(buf, "ALSA receiver port %d\n", system_port);
snd_iprintf(buf, "\nNumber of applications: %d\n", num_clients);
for (i = 0; i < num_clients; i++) {
snd_iprintf(buf, "\nApplication %d: ", i);
dp = client_table[i];
if (!dp) {
snd_iprintf(buf, "*empty*\n");
continue;
}
snd_iprintf(buf, "port %d : queue %d\n", dp->port, dp->queue);
snd_iprintf(buf, " sequencer mode = %s : file open mode = %s\n",
(dp->seq_mode ? "music" : "synth"),
filemode_str(dp->file_mode));
if (dp->seq_mode)
snd_iprintf(buf, " timer tempo = %d, timebase = %d\n",
dp->timer->oss_tempo, dp->timer->oss_timebase);
snd_iprintf(buf, " max queue length %d\n", maxqlen);
if (is_read_mode(dp->file_mode) && dp->readq)
snd_seq_oss_readq_info_read(dp->readq, buf);
}
}
#endif /* CONFIG_SND_PROC_FS */
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