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kernel/linux-rt-4.4.41/sound/core/seq/seq_info.c 2.19 KB
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  /*
   *   ALSA sequencer /proc interface
   *   Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
   *
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *   GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   *
   */
  
  #include <linux/init.h>
  #include <linux/export.h>
  #include <sound/core.h>
  
  #include "seq_info.h"
  #include "seq_clientmgr.h"
  #include "seq_timer.h"
  
  static struct snd_info_entry *queues_entry;
  static struct snd_info_entry *clients_entry;
  static struct snd_info_entry *timer_entry;
  
  
  static struct snd_info_entry * __init
  create_info_entry(char *name, void (*read)(struct snd_info_entry *,
  					   struct snd_info_buffer *))
  {
  	struct snd_info_entry *entry;
  
  	entry = snd_info_create_module_entry(THIS_MODULE, name, snd_seq_root);
  	if (entry == NULL)
  		return NULL;
  	entry->content = SNDRV_INFO_CONTENT_TEXT;
  	entry->c.text.read = read;
  	if (snd_info_register(entry) < 0) {
  		snd_info_free_entry(entry);
  		return NULL;
  	}
  	return entry;
  }
  
  static void free_info_entries(void)
  {
  	snd_info_free_entry(queues_entry);
  	snd_info_free_entry(clients_entry);
  	snd_info_free_entry(timer_entry);
  }
  
  /* create all our /proc entries */
  int __init snd_seq_info_init(void)
  {
  	queues_entry = create_info_entry("queues",
  					 snd_seq_info_queues_read);
  	clients_entry = create_info_entry("clients",
  					  snd_seq_info_clients_read);
  	timer_entry = create_info_entry("timer", snd_seq_info_timer_read);
  	if (!queues_entry || !clients_entry || !timer_entry)
  		goto error;
  	return 0;
  
   error:
  	free_info_entries();
  	return -ENOMEM;
  }
  
  int __exit snd_seq_info_done(void)
  {
  	free_info_entries();
  	return 0;
  }