kernel/sound/core/seq/seq_info.c

   1 /*
   2  *   ALSA sequencer /proc interface
   3  *   Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/export.h>
  24 #include <sound/core.h>
  25
  26 #include "seq_info.h"
  27 #include "seq_clientmgr.h"
  28 #include "seq_timer.h"
  29
  30 static struct snd_info_entry *queues_entry;
  31 static struct snd_info_entry *clients_entry;
  32 static struct snd_info_entry *timer_entry;
  33
  34
  35 static struct snd_info_entry * __init
  36 create_info_entry(char *name, void (*read)(struct snd_info_entry *,
  37                                            struct snd_info_buffer *))
  38 {
  39         struct snd_info_entry *entry;
  40
  41         entry = snd_info_create_module_entry(THIS_MODULE, name, snd_seq_root);
  42         if (entry == NULL)
  43                 return NULL;
  44         entry->content = SNDRV_INFO_CONTENT_TEXT;
  45         entry->c.text.read = read;
  46         if (snd_info_register(entry) < 0) {
  47                 snd_info_free_entry(entry);
  48                 return NULL;
  49         }
  50         return entry;
  51 }
  52
  53 static void free_info_entries(void)
  54 {
  55         snd_info_free_entry(queues_entry);
  56         snd_info_free_entry(clients_entry);
  57         snd_info_free_entry(timer_entry);
  58 }
  59
  60 /* create all our /proc entries */
  61 int __init snd_seq_info_init(void)
  62 {
  63         queues_entry = create_info_entry("queues",
  64                                          snd_seq_info_queues_read);
  65         clients_entry = create_info_entry("clients",
  66                                           snd_seq_info_clients_read);
  67         timer_entry = create_info_entry("timer", snd_seq_info_timer_read);
  68         if (!queues_entry || !clients_entry || !timer_entry)
  69                 goto error;
  70         return 0;
  71
  72  error:
  73         free_info_entries();
  74         return -ENOMEM;
  75 }
  76
  77 int __exit snd_seq_info_done(void)
  78 {
  79         free_info_entries();
  80         return 0;
  81 }