/* 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_MODULESvoid 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 */