/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_PCM_OSS_H
#define __SOUND_PCM_OSS_H

/*
 *  Digital Audio (PCM) - OSS compatibility abstract layer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

struct snd_pcm_oss_setup {
        char *task_name;
        unsigned int disable:1,
                     direct:1,
                     block:1,
                     nonblock:1,
                     partialfrag:1,
                     nosilence:1,
                     buggyptr:1;
        unsigned int periods;
        unsigned int period_size;
        struct snd_pcm_oss_setup *next;
};

struct snd_pcm_oss_runtime {
        unsigned params: 1,                     /* format/parameter change */
                 prepare: 1,                    /* need to prepare the operation */
                 trigger: 1,                    /* trigger flag */
                 sync_trigger: 1;               /* sync trigger flag */
        int rate;                               /* requested rate */
        int format;                             /* requested OSS format */
        unsigned int channels;                  /* requested channels */
        unsigned int fragshift;
        unsigned int maxfrags;
        unsigned int subdivision;               /* requested subdivision */
        size_t period_bytes;                    /* requested period size */
        size_t period_frames;                   /* period frames for poll */
        size_t period_ptr;                      /* actual write pointer to period */
        unsigned int periods;
        size_t buffer_bytes;                    /* requested buffer size */
        size_t bytes;                           /* total # bytes processed */
        size_t mmap_bytes;
        char *buffer;                           /* vmallocated period */
        size_t buffer_used;                     /* used length from period buffer */
        struct mutex params_lock;
        atomic_t rw_ref;                /* concurrent read/write accesses */
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
        struct snd_pcm_plugin *plugin_first;
        struct snd_pcm_plugin *plugin_last;
#endif
        unsigned int prev_hw_ptr_period;
};

struct snd_pcm_oss_file {
        struct snd_pcm_substream *streams[2];
};

struct snd_pcm_oss_substream {
        unsigned oss: 1;                        /* oss mode */
        struct snd_pcm_oss_setup setup;         /* active setup */
};

struct snd_pcm_oss_stream {
        struct snd_pcm_oss_setup *setup_list;   /* setup list */
        struct mutex setup_mutex;
#ifdef CONFIG_SND_VERBOSE_PROCFS
        struct snd_info_entry *proc_entry;
#endif
};

struct snd_pcm_oss {
        int reg;
        unsigned int reg_mask;
};

#endif /* __SOUND_PCM_OSS_H */