sound/core/seq/seq_info.c

   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
  15 static struct snd_info_entry *queues_entry;
  16 static struct snd_info_entry *clients_entry;
  17 static struct snd_info_entry *timer_entry;
  18
  19
  20 static struct snd_info_entry * __init
  21 create_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
  38 void 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 */
  46 int __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 }