sound/synth/emux/emux.c

Source file repositories/reference/linux-study-clean/sound/synth/emux/emux.c

File Facts

System
Linux kernel
Corpus path
sound/synth/emux/emux.c
Extension
.c
Size
3155 bytes
Lines
146
Domain
Driver Families
Bucket
sound/synth
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
 *
 *  Routines for control of EMU WaveTable chip
 */

#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <sound/core.h>
#include <sound/emux_synth.h>
#include <linux/init.h>
#include <linux/module.h>
#include "emux_voice.h"

MODULE_AUTHOR("Takashi Iwai");
MODULE_DESCRIPTION("Routines for control of EMU WaveTable chip");
MODULE_LICENSE("GPL");

/*
 * create a new hardware dependent device for Emu8000/Emu10k1
 */
int snd_emux_new(struct snd_emux **remu)
{
	struct snd_emux *emu;

	*remu = NULL;
	emu = kzalloc_obj(*emu);
	if (emu == NULL)
		return -ENOMEM;

	spin_lock_init(&emu->voice_lock);
	mutex_init(&emu->register_mutex);

	emu->client = -1;
#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
	emu->oss_synth = NULL;
#endif
	emu->max_voices = 0;
	emu->use_time = 0;

	timer_setup(&emu->tlist, snd_emux_timer_callback, 0);
	emu->timer_active = 0;

	*remu = emu;
	return 0;
}

EXPORT_SYMBOL(snd_emux_new);

/*
 */
static int sf_sample_new(void *private_data, struct snd_sf_sample *sp,
				  struct snd_util_memhdr *hdr,
				  const void __user *buf, long count)
{
	struct snd_emux *emu = private_data;
	return emu->ops.sample_new(emu, sp, hdr, buf, count);
	
}

static int sf_sample_free(void *private_data, struct snd_sf_sample *sp,
				   struct snd_util_memhdr *hdr)
{
	struct snd_emux *emu = private_data;
	return emu->ops.sample_free(emu, sp, hdr);
	
}

static void sf_sample_reset(void *private_data)
{
	struct snd_emux *emu = private_data;
	emu->ops.sample_reset(emu);
}

int snd_emux_register(struct snd_emux *emu, struct snd_card *card, int index, char *name)
{
	int err;
	struct snd_sf_callback sf_cb;

	if (snd_BUG_ON(!emu->hw || emu->max_voices <= 0))
		return -EINVAL;
	if (snd_BUG_ON(!card || !name))
		return -EINVAL;

	emu->card = card;
	emu->name = kstrdup_const(name, GFP_KERNEL);
	emu->voices = kzalloc_objs(struct snd_emux_voice, emu->max_voices);
	if (emu->name == NULL || emu->voices == NULL)

Annotation

Implementation Notes