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1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
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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 <fvdpol@coil.demon.nl> |
8 | */ |
9 | #include <linux/time.h> |
10 | #include <sound/asequencer.h> |
11 | |
12 | typedef struct snd_seq_real_time snd_seq_real_time_t; |
13 | typedef 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 */ |
44 | struct 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) |
58 | int snd_seq_create_kernel_client(struct snd_card *card, int client_index, |
59 | const char *name_fmt, ...); |
60 | int snd_seq_delete_kernel_client(int client); |
61 | int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, |
62 | struct file *file, bool blocking); |
63 | int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event *ev, int atomic, int hop); |
64 | int 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 | |
70 | typedef int (*snd_seq_dump_func_t)(void *ptr, void *buf, int count); |
71 | int snd_seq_expand_var_event(const struct snd_seq_event *event, int count, char *buf, |
72 | int in_kernel, int size_aligned); |
73 | int snd_seq_expand_var_event_at(const struct snd_seq_event *event, int count, |
74 | char *buf, int offset); |
75 | int 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 */ |
79 | static 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 */ |
87 | int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo); |
88 | |
89 | /* port callback routines */ |
90 | void snd_port_init_callback(struct snd_seq_port_callback *p); |
91 | struct snd_seq_port_callback *snd_port_alloc_callback(void); |
92 | |
93 | /* port attach/detach */ |
94 | int snd_seq_event_port_attach(int client, struct snd_seq_port_callback *pcbp, |
95 | int cap, int type, int midi_channels, int midi_voices, char *portname); |
96 | int snd_seq_event_port_detach(int client, int port); |
97 | |
98 | #ifdef CONFIG_MODULES |
99 | void snd_seq_autoload_init(void); |
100 | void snd_seq_autoload_exit(void); |
101 | #else |
102 | #define snd_seq_autoload_init() |
103 | #define snd_seq_autoload_exit() |
104 | #endif |
105 | |
106 | #endif /* __SOUND_SEQ_KERNEL_H */ |
107 |
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