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
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