#ifndef __SOUND_PCM_OSS_H
  #define __SOUND_PCM_OSS_H
  
  /*
   *  Digital Audio (PCM) - OSS compatibility abstract layer

   *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>

   *
   *
   *   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
   *
   */

  struct snd_pcm_oss_setup {

  	char *task_name;
  	unsigned int disable:1,
  		     direct:1,
  		     block:1,
  		     nonblock:1,
  		     partialfrag:1,

  		     nosilence:1,
  		     buggyptr:1;

  	unsigned int periods;
  	unsigned int period_size;

  	struct snd_pcm_oss_setup *next;

  };

  struct snd_pcm_oss_runtime {

  	unsigned params: 1,			/* format/parameter change */
  		 prepare: 1,			/* need to prepare the operation */
  		 trigger: 1,			/* trigger flag */
  		 sync_trigger: 1;		/* sync trigger flag */
  	int rate;				/* requested rate */
  	int format;				/* requested OSS format */
  	unsigned int channels;			/* requested channels */
  	unsigned int fragshift;
  	unsigned int maxfrags;
  	unsigned int subdivision;		/* requested subdivision */
  	size_t period_bytes;			/* requested period size */
  	size_t period_frames;			/* period frames for poll */
  	size_t period_ptr;			/* actual write pointer to period */
  	unsigned int periods;
  	size_t buffer_bytes;			/* requested buffer size */
  	size_t bytes;				/* total # bytes processed */
  	size_t mmap_bytes;
  	char *buffer;				/* vmallocated period */
  	size_t buffer_used;			/* used length from period buffer */

  	struct mutex params_lock;

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  	struct snd_pcm_plugin *plugin_first;
  	struct snd_pcm_plugin *plugin_last;

  #endif

  	unsigned int prev_hw_ptr_period;

  };

  struct snd_pcm_oss_file {
  	struct snd_pcm_substream *streams[2];
  };

  struct snd_pcm_oss_substream {

  	unsigned oss: 1;			/* oss mode */

  	struct snd_pcm_oss_setup setup;		/* active setup */

  };

  struct snd_pcm_oss_stream {
  	struct snd_pcm_oss_setup *setup_list;	/* setup list */

  	struct mutex setup_mutex;

  #ifdef CONFIG_SND_VERBOSE_PROCFS

  	struct snd_info_entry *proc_entry;

  #endif

  };

  struct snd_pcm_oss {

  	int reg;
  	unsigned int reg_mask;

  };

  
  #endif /* __SOUND_PCM_OSS_H */