linux/sound/core/seq/oss/seq_oss_readq.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OSS compatible sequencer driver
 *
 * seq_oss_readq.c - MIDI input queue
 *
 * Copyright (C) 1998,99 Takashi Iwai <[email protected]>
 */

#include "seq_oss_readq.h"
#include "seq_oss_event.h"
#include <sound/seq_oss_legacy.h>
#include "../seq_lock.h"
#include <linux/wait.h>
#include <linux/slab.h>

/*
 * constants
 */
//#define SNDRV_SEQ_OSS_MAX_TIMEOUT	(unsigned long)(-1)
#define SNDRV_SEQ_OSS_MAX_TIMEOUT …


/*
 * prototypes
 */


/*
 * create a read queue
 */
struct seq_oss_readq *
snd_seq_oss_readq_new(struct seq_oss_devinfo *dp, int maxlen)
{ … }

/*
 * delete the read queue
 */
void
snd_seq_oss_readq_delete(struct seq_oss_readq *q)
{ … }

/*
 * reset the read queue
 */
void
snd_seq_oss_readq_clear(struct seq_oss_readq *q)
{ … }

/*
 * put a midi byte
 */
int
snd_seq_oss_readq_puts(struct seq_oss_readq *q, int dev, unsigned char *data, int len)
{ … }

/*
 * put MIDI sysex bytes; the event buffer may be chained, thus it has
 * to be expanded via snd_seq_dump_var_event().
 */
struct readq_sysex_ctx { … };

static int readq_dump_sysex(void *ptr, void *buf, int count)
{ … }

int snd_seq_oss_readq_sysex(struct seq_oss_readq *q, int dev,
			    struct snd_seq_event *ev)
{ … }

/*
 * copy an event to input queue:
 * return zero if enqueued
 */
int
snd_seq_oss_readq_put_event(struct seq_oss_readq *q, union evrec *ev)
{ … }


/*
 * pop queue
 * caller must hold lock
 */
int
snd_seq_oss_readq_pick(struct seq_oss_readq *q, union evrec *rec)
{ … }

/*
 * sleep until ready
 */
void
snd_seq_oss_readq_wait(struct seq_oss_readq *q)
{ … }

/*
 * drain one record
 * caller must hold lock
 */
void
snd_seq_oss_readq_free(struct seq_oss_readq *q)
{ … }

/*
 * polling/select:
 * return non-zero if readq is not empty.
 */
unsigned int
snd_seq_oss_readq_poll(struct seq_oss_readq *q, struct file *file, poll_table *wait)
{ … }

/*
 * put a timestamp
 */
int
snd_seq_oss_readq_put_timestamp(struct seq_oss_readq *q, unsigned long curt, int seq_mode)
{ … }


#ifdef CONFIG_SND_PROC_FS
/*
 * proc interface
 */
void
snd_seq_oss_readq_info_read(struct seq_oss_readq *q, struct snd_info_buffer *buf)
{ … }
#endif /* CONFIG_SND_PROC_FS */