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 */ snd_seq_event_packet_size(struct snd_seq_event * ev)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 */ 103