| 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 <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 attach/detach */ |
| 90 | int 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); |
| 92 | int snd_seq_event_port_detach(int client, int port); |
| 93 | |
| 94 | #ifdef CONFIG_MODULES |
| 95 | void snd_seq_autoload_init(void); |
| 96 | void 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 */ |