/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_HWDEP_H
#define __SOUND_HWDEP_H

/*
 *  Hardware dependent layer 
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

#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);
        __poll_t (*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
        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 device *dev;

        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 */