LXR linux/sound/core/seq/seq

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *   ALSA sequencer /proc interface
   4 *   Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
   5 */
   6
   7#include <linux/init.h>
   8#include <linux/export.h>
   9#include <sound/core.h>
  10
  11#include "seq_info.h"
  12#include "seq_clientmgr.h"
  13#include "seq_timer.h"
  14
  15static struct snd_info_entry *queues_entry;
  16static struct snd_info_entry *clients_entry;
  17static struct snd_info_entry *timer_entry;
  18
  19
  20static struct snd_info_entry * __init
  21create_info_entry(char *name, void (*read)(struct snd_info_entry *,
  22                                           struct snd_info_buffer *))
  23{
  24        struct snd_info_entry *entry;
  25
  26        entry = snd_info_create_module_entry(THIS_MODULE, name, snd_seq_root);
  27        if (entry == NULL)
  28                return NULL;
  29        entry->content = SNDRV_INFO_CONTENT_TEXT;
  30        entry->c.text.read = read;
  31        if (snd_info_register(entry) < 0) {
  32                snd_info_free_entry(entry);
  33                return NULL;
  34        }
  35        return entry;
  36}
  37
  38void snd_seq_info_done(void)
  39{
  40        snd_info_free_entry(queues_entry);
  41        snd_info_free_entry(clients_entry);
  42        snd_info_free_entry(timer_entry);
  43}
  44
  45/* create all our /proc entries */
  46int __init snd_seq_info_init(void)
  47{
  48        queues_entry = create_info_entry("queues",
  49                                         snd_seq_info_queues_read);
  50        clients_entry = create_info_entry("clients",
  51                                          snd_seq_info_clients_read);
  52        timer_entry = create_info_entry("timer", snd_seq_info_timer_read);
  53        if (!queues_entry || !clients_entry || !timer_entry)
  54                goto error;
  55        return 0;
  56
  57 error:
  58        snd_seq_info_done();
  59        return -ENOMEM;
  60}
  61