1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_PCM_OSS_H
3 #define __SOUND_PCM_OSS_H
4
5 /*
6 * Digital Audio (PCM) - OSS compatibility abstract layer
7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
8 */
9
10 struct snd_pcm_oss_setup {
11 char *task_name;
12 unsigned int disable:1,
13 direct:1,
14 block:1,
15 nonblock:1,
16 partialfrag:1,
17 nosilence:1,
18 buggyptr:1;
19 unsigned int periods;
20 unsigned int period_size;
21 struct snd_pcm_oss_setup *next;
22 };
23
24 struct snd_pcm_oss_runtime {
25 unsigned params: 1, /* format/parameter change */
26 prepare: 1, /* need to prepare the operation */
27 trigger: 1, /* trigger flag */
28 sync_trigger: 1; /* sync trigger flag */
29 int rate; /* requested rate */
30 int format; /* requested OSS format */
31 unsigned int channels; /* requested channels */
32 unsigned int fragshift;
33 unsigned int maxfrags;
34 unsigned int subdivision; /* requested subdivision */
35 size_t period_bytes; /* requested period size */
36 size_t period_frames; /* period frames for poll */
37 size_t period_ptr; /* actual write pointer to period */
38 unsigned int periods;
39 size_t buffer_bytes; /* requested buffer size */
40 size_t bytes; /* total # bytes processed */
41 size_t mmap_bytes;
42 char *buffer; /* vmallocated period */
43 size_t buffer_used; /* used length from period buffer */
44 struct mutex params_lock;
45 atomic_t rw_ref; /* concurrent read/write accesses */
46 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
47 struct snd_pcm_plugin *plugin_first;
48 struct snd_pcm_plugin *plugin_last;
49 #endif
50 unsigned int prev_hw_ptr_period;
51 };
52
53 struct snd_pcm_oss_file {
54 struct snd_pcm_substream *streams[2];
55 };
56
57 struct snd_pcm_oss_substream {
58 unsigned oss: 1; /* oss mode */
59 struct snd_pcm_oss_setup setup; /* active setup */
60 };
61
62 struct snd_pcm_oss_stream {
63 struct snd_pcm_oss_setup *setup_list; /* setup list */
64 struct mutex setup_mutex;
65 #ifdef CONFIG_SND_VERBOSE_PROCFS
66 struct snd_info_entry *proc_entry;
67 #endif
68 };
69
70 struct snd_pcm_oss {
71 int reg;
72 unsigned int reg_mask;
73 };
74
75 #endif /* __SOUND_PCM_OSS_H */