include/sound/pcm_oss.h

   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 */