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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_SEQ_KERNEL_H
#define __SOUND_SEQ_KERNEL_H
/*
* Main kernel header file for the ALSA sequencer
* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
*/
#include <linux/time.h>
#include <sound/asequencer.h>
typedef struct snd_seq_real_time snd_seq_real_time_t;
typedef union snd_seq_timestamp snd_seq_timestamp_t;
/* maximum number of queues */
#define SNDRV_SEQ_MAX_QUEUES 32
/* max number of concurrent clients */
#define SNDRV_SEQ_MAX_CLIENTS 192
/* max number of concurrent ports */
#define SNDRV_SEQ_MAX_PORTS 254
/* max number of events in memory pool */
#define SNDRV_SEQ_MAX_EVENTS 2000
/* default number of events in memory pool */
#define SNDRV_SEQ_DEFAULT_EVENTS 500
/* max number of events in memory pool for one client (outqueue) */
#define SNDRV_SEQ_MAX_CLIENT_EVENTS 2000
/* default number of events in memory pool for one client (outqueue) */
#define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200
/* max delivery path length */
/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */
#define SNDRV_SEQ_MAX_HOPS 8
/* max size of event size */
#define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff
/* call-backs for kernel port */
struct snd_seq_port_callback {
struct module *owner;
void *private_data;
int (*subscribe)(void *private_data, struct snd_seq_port_subscribe *info);
int (*unsubscribe)(void *private_data, struct snd_seq_port_subscribe *info);
int (*use)(void *private_data, struct snd_seq_port_subscribe *info);
int (*unuse)(void *private_data, struct snd_seq_port_subscribe *info);
int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop);
void (*private_free)(void *private_data);
/*...*/
};
/* interface for kernel client */
__printf(3, 4)
int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
const char *name_fmt, ...);
int snd_seq_delete_kernel_client(int client);
int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
struct file *file, bool blocking);
int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop);
int snd_seq_kernel_client_ctl(int client, unsigned int cmd, void *arg);
#define SNDRV_SEQ_EXT_MASK 0xc0000000
#define SNDRV_SEQ_EXT_USRPTR 0x80000000
#define SNDRV_SEQ_EXT_CHAINED 0x40000000
typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count);
int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
int in_kernel, int size_aligned);
int snd_seq_expand_var_event_at(const struct snd_seq_event *event, int count,
char *buf, int offset);
int snd_seq_dump_var_event(const struct snd_seq_event *event,
snd_seq_dump_func_t func, void *private_data);
/* size of the event packet; it can be greater than snd_seq_event size */
static inline size_t snd_seq_event_packet_size(struct snd_seq_event *ev)
{
if (snd_seq_ev_is_ump(ev))
return sizeof(struct snd_seq_ump_event);
return sizeof(struct snd_seq_event);
}
/* interface for OSS emulation */
int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo);
/* port callback routines */
void snd_port_init_callback(struct snd_seq_port_callback *p);
struct snd_seq_port_callback *snd_port_alloc_callback(void);
/* port attach/detach */
int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp,
int cap, int type, int midi_channels, int midi_voices, char *portname);
int snd_seq_event_port_detach(int client, int port);
#ifdef CONFIG_MODULES
void snd_seq_autoload_init(void);
void snd_seq_autoload_exit(void);
#else
#define snd_seq_autoload_init()
#define snd_seq_autoload_exit()
#endif
#endif /* __SOUND_SEQ_KERNEL_H */
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