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 
13 struct snd_hwdep;
14 
15 /* hwdep file ops; all ops can be NULL */
16 struct 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 
39 struct 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 
64 extern int snd_hwdep_new(struct snd_card *card, char *id, int device,
65 			 struct snd_hwdep **rhwdep);
66 
67 #endif /* __SOUND_HWDEP_H */
68