1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef __SOUND_HWDEP_H
3#define __SOUND_HWDEP_H
4
5/*
6 *  Hardware dependent layer
7 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
8 */
9
10#include <sound/asound.h>
11#include <linux/poll.h>
12
13struct snd_hwdep;
14
15/* hwdep file ops; all ops can be NULL */
16struct snd_hwdep_ops {
17	long long (*llseek)(struct snd_hwdep *hw, struct file *file,
18			    long long offset, int orig);
19	long (*read)(struct snd_hwdep *hw, char __user *buf,
20		     long count, loff_t *offset);
21	long (*write)(struct snd_hwdep *hw, const char __user *buf,
22		      long count, loff_t *offset);
23	int (*open)(struct snd_hwdep *hw, struct file * file);
24	int (*release)(struct snd_hwdep *hw, struct file * file);
25	__poll_t (*poll)(struct snd_hwdep *hw, struct file *file,
26			     poll_table *wait);
27	int (*ioctl)(struct snd_hwdep *hw, struct file *file,
28		     unsigned int cmd, unsigned long arg);
29	int (*ioctl_compat)(struct snd_hwdep *hw, struct file *file,
30			    unsigned int cmd, unsigned long arg);
31	int (*mmap)(struct snd_hwdep *hw, struct file *file,
32		    struct vm_area_struct *vma);
33	int (*dsp_status)(struct snd_hwdep *hw,
34			  struct snd_hwdep_dsp_status *status);
35	int (*dsp_load)(struct snd_hwdep *hw,
36			struct snd_hwdep_dsp_image *image);
37};
38
39struct snd_hwdep {
40	struct snd_card *card;
41	struct list_head list;
42	int device;
43	char id[32];
44	char name[80];
45	int iface;
46
47#ifdef CONFIG_SND_OSSEMUL
48	int oss_type;
49	int ossreg;
50#endif
51
52	struct snd_hwdep_ops ops;
53	wait_queue_head_t open_wait;
54	void *private_data;
55	void (*private_free) (struct snd_hwdep *hwdep);
56	struct device *dev;
57
58	struct mutex open_mutex;
59	int used;			/* reference counter */
60	unsigned int dsp_loaded;	/* bit fields of loaded dsp indices */
61	unsigned int exclusive:1;	/* exclusive access mode */
62};
63
64extern int snd_hwdep_new(struct snd_card *card, char *id, int device,
65			 struct snd_hwdep **rhwdep);
66
67#endif /* __SOUND_HWDEP_H */
68