#ifndef __SOUND_HWDEP_H
  #define __SOUND_HWDEP_H
  
  /*
   *  Hardware dependent 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
   *
   */
  
  #include <sound/asound.h>
  #include <linux/poll.h>
  
  struct snd_hwdep;
  
  /* hwdep file ops; all ops can be NULL */
  struct snd_hwdep_ops {
  	long long (*llseek)(struct snd_hwdep *hw, struct file *file,
  			    long long offset, int orig);
  	long (*read)(struct snd_hwdep *hw, char __user *buf,
  		     long count, loff_t *offset);
  	long (*write)(struct snd_hwdep *hw, const char __user *buf,
  		      long count, loff_t *offset);
  	int (*open)(struct snd_hwdep *hw, struct file * file);
  	int (*release)(struct snd_hwdep *hw, struct file * file);
  	unsigned int (*poll)(struct snd_hwdep *hw, struct file *file,
  			     poll_table *wait);
  	int (*ioctl)(struct snd_hwdep *hw, struct file *file,
  		     unsigned int cmd, unsigned long arg);
  	int (*ioctl_compat)(struct snd_hwdep *hw, struct file *file,
  			    unsigned int cmd, unsigned long arg);
  	int (*mmap)(struct snd_hwdep *hw, struct file *file,
  		    struct vm_area_struct *vma);
  	int (*dsp_status)(struct snd_hwdep *hw,
  			  struct snd_hwdep_dsp_status *status);
  	int (*dsp_load)(struct snd_hwdep *hw,
  			struct snd_hwdep_dsp_image *image);
  };
  
  struct snd_hwdep {
  	struct snd_card *card;
  	struct list_head list;
  	int device;
  	char id[32];
  	char name[80];
  	int iface;
  
  #ifdef CONFIG_SND_OSSEMUL
  	char oss_dev[32];
  	int oss_type;
  	int ossreg;
  #endif
  
  	struct snd_hwdep_ops ops;
  	wait_queue_head_t open_wait;
  	void *private_data;
  	void (*private_free) (struct snd_hwdep *hwdep);
  
  	struct mutex open_mutex;
  	int used;			/* reference counter */
  	unsigned int dsp_loaded;	/* bit fields of loaded dsp indices */
  	unsigned int exclusive:1;	/* exclusive access mode */
  };
  
  extern int snd_hwdep_new(struct snd_card *card, char *id, int device,
  			 struct snd_hwdep **rhwdep);
  
  #endif /* __SOUND_HWDEP_H */