linux/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright 2011 Broadcom Corporation.  All rights reserved. */

#ifndef __SOUND_ARM_BCM2835_H
#define __SOUND_ARM_BCM2835_H

#include <linux/device.h>
#include <linux/wait.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm-indirect.h>

#include "../include/linux/raspberrypi/vchiq.h"

#define MAX_SUBSTREAMS …
#define AVAIL_SUBSTREAMS_MASK …

enum { … };

/* macros for alsa2chip and chip2alsa, instead of functions */

// convert alsa to chip volume (defined as macro rather than function call)
#define alsa2chip(vol) …

// convert chip to alsa volume
#define chip2alsa(vol) …

#define CHIP_MIN_VOLUME …

/* Some constants for values .. */
enum snd_bcm2835_route { … };

enum snd_bcm2835_ctrl { … };

struct bcm2835_vchi_ctx { … };

/* definition of the chip-specific record */
struct bcm2835_chip { … };

struct bcm2835_alsa_stream { … };

int snd_bcm2835_new_pcm(struct bcm2835_chip *chip, const char *name,
			int idx, enum snd_bcm2835_route route,
			u32 numchannels, bool spdif);

int snd_bcm2835_new_hdmi_ctl(struct bcm2835_chip *chip);
int snd_bcm2835_new_headphones_ctl(struct bcm2835_chip *chip);

int bcm2835_new_vchi_ctx(struct device *dev, struct bcm2835_vchi_ctx *vchi_ctx);
void bcm2835_free_vchi_ctx(struct bcm2835_vchi_ctx *vchi_ctx);

int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_set_params(struct bcm2835_alsa_stream *alsa_stream,
			     unsigned int channels, unsigned int samplerate,
			     unsigned int bps);
int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_drain(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_set_ctls(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
			unsigned int count,
			void *src);
void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream,
			   unsigned int size);
unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream);

#endif /* __SOUND_ARM_BCM2835_H */