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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef __SOUND_SEQ_KERNEL_H
3#define __SOUND_SEQ_KERNEL_H
4
5/*
6 * Main kernel header file for the ALSA sequencer
7 * Copyright (c) 1998 by Frank van de Pol <[email protected]>
8 */
9#include <linux/time.h>
10#include <sound/asequencer.h>
11
12typedef struct snd_seq_real_time snd_seq_real_time_t;
13typedef union snd_seq_timestamp snd_seq_timestamp_t;
14
15/* maximum number of queues */
16#define SNDRV_SEQ_MAX_QUEUES 32
17
18/* max number of concurrent clients */
19#define SNDRV_SEQ_MAX_CLIENTS 192
20
21/* max number of concurrent ports */
22#define SNDRV_SEQ_MAX_PORTS 254
23
24/* max number of events in memory pool */
25#define SNDRV_SEQ_MAX_EVENTS 2000
26
27/* default number of events in memory pool */
28#define SNDRV_SEQ_DEFAULT_EVENTS 500
29
30/* max number of events in memory pool for one client (outqueue) */
31#define SNDRV_SEQ_MAX_CLIENT_EVENTS 2000
32
33/* default number of events in memory pool for one client (outqueue) */
34#define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200
35
36/* max delivery path length */
37/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */
38#define SNDRV_SEQ_MAX_HOPS 8
39
40/* max size of event size */
41#define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff
42
43/* call-backs for kernel port */
44struct snd_seq_port_callback {
45 struct module *owner;
46 void *private_data;
47 int (*subscribe)(void *private_data, struct snd_seq_port_subscribe *info);
48 int (*unsubscribe)(void *private_data, struct snd_seq_port_subscribe *info);
49 int (*use)(void *private_data, struct snd_seq_port_subscribe *info);
50 int (*unuse)(void *private_data, struct snd_seq_port_subscribe *info);
51 int (*event_input)(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop);
52 void (*private_free)(void *private_data);
53 /*...*/
54};
55
56/* interface for kernel client */
57__printf(3, 4)
58int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
59 const char *name_fmt, ...);
60int snd_seq_delete_kernel_client(int client);
61int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev,
62 struct file *file, bool blocking);
63int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop);
64int snd_seq_kernel_client_ctl(int client, unsigned int cmd, void *arg);
65
66#define SNDRV_SEQ_EXT_MASK 0xc0000000
67#define SNDRV_SEQ_EXT_USRPTR 0x80000000
68#define SNDRV_SEQ_EXT_CHAINED 0x40000000
69
70typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count);
71int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf,
72 int in_kernel, int size_aligned);
73int snd_seq_expand_var_event_at(const struct snd_seq_event *event, int count,
74 char *buf, int offset);
75int snd_seq_dump_var_event(const struct snd_seq_event *event,
76 snd_seq_dump_func_t func, void *private_data);
77
78/* size of the event packet; it can be greater than snd_seq_event size */
79static inline size_t snd_seq_event_packet_size(struct snd_seq_event *ev)
80{
81 if (snd_seq_ev_is_ump(ev))
82 return sizeof(struct snd_seq_ump_event);
83 return sizeof(struct snd_seq_event);
84}
85
86/* interface for OSS emulation */
87int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo);
88
89/* port attach/detach */
90int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp,
91 int cap, int type, int midi_channels, int midi_voices, char *portname);
92int snd_seq_event_port_detach(int client, int port);
93
94#ifdef CONFIG_MODULES
95void snd_seq_autoload_init(void);
96void snd_seq_autoload_exit(void);
97#else
98#define snd_seq_autoload_init()
99#define snd_seq_autoload_exit()
100#endif
101
102#endif /* __SOUND_SEQ_KERNEL_H */