LXR linux/sound/core/seq/seq

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *   ALSA sequencer Client Manager
   4 *   Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
   5 */
   6#ifndef __SND_SEQ_CLIENTMGR_H
   7#define __SND_SEQ_CLIENTMGR_H
   8
   9#include <sound/seq_kernel.h>
  10#include <linux/bitops.h>
  11#include "seq_fifo.h"
  12#include "seq_ports.h"
  13#include "seq_lock.h"
  14
  15
  16/* client manager */
  17
  18struct snd_seq_user_client {
  19        struct file *file;      /* file struct of client */
  20        /* ... */
  21        struct pid *owner;
  22        
  23        /* fifo */
  24        struct snd_seq_fifo *fifo;      /* queue for incoming events */
  25        int fifo_pool_size;
  26};
  27
  28struct snd_seq_kernel_client {
  29        /* ... */
  30        struct snd_card *card;
  31};
  32
  33
  34struct snd_seq_client {
  35        snd_seq_client_type_t type;
  36        unsigned int accept_input: 1,
  37                accept_output: 1;
  38        char name[64];          /* client name */
  39        int number;             /* client number */
  40        unsigned int filter;    /* filter flags */
  41        DECLARE_BITMAP(event_filter, 256);
  42        snd_use_lock_t use_lock;
  43        int event_lost;
  44        /* ports */
  45        int num_ports;          /* number of ports */
  46        struct list_head ports_list_head;
  47        rwlock_t ports_lock;
  48        struct mutex ports_mutex;
  49        struct mutex ioctl_mutex;
  50        int convert32;          /* convert 32->64bit */
  51
  52        /* output pool */
  53        struct snd_seq_pool *pool;              /* memory pool for this client */
  54
  55        union {
  56                struct snd_seq_user_client user;
  57                struct snd_seq_kernel_client kernel;
  58        } data;
  59};
  60
  61/* usage statistics */
  62struct snd_seq_usage {
  63        int cur;
  64        int peak;
  65};
  66
  67
  68int client_init_data(void);
  69int snd_sequencer_device_init(void);
  70void snd_sequencer_device_done(void);
  71
  72/* get locked pointer to client */
  73struct snd_seq_client *snd_seq_client_use_ptr(int clientid);
  74
  75/* unlock pointer to client */
  76#define snd_seq_client_unlock(client) snd_use_lock_free(&(client)->use_lock)
  77
  78/* dispatch event to client(s) */
  79int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop);
  80
  81int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait);
  82int snd_seq_client_notify_subscription(int client, int port,
  83                                       struct snd_seq_port_subscribe *info, int evtype);
  84
  85/* only for OSS sequencer */
  86bool snd_seq_client_ioctl_lock(int clientid);
  87void snd_seq_client_ioctl_unlock(int clientid);
  88
  89extern int seq_client_load[15];
  90
  91#endif
  92