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hwdep.h

#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 */

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