linux/include/sound/hwdep.h

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

/*
 *  Hardware dependent layer 
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 */

#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 */