linux/sound/soc/codecs/audio-iio-aux.c

// SPDX-License-Identifier: GPL-2.0-only
//
// ALSA SoC glue to use IIO devices as audio components
//
// Copyright 2023 CS GROUP France
//
// Author: Herve Codina <[email protected]>

#include <linux/cleanup.h>
#include <linux/iio/consumer.h>
#include <linux/minmax.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string_helpers.h>

#include <sound/soc.h>
#include <sound/tlv.h>

struct audio_iio_aux_chan { … };

struct audio_iio_aux { … };

static int audio_iio_aux_info_volsw(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_info *uinfo)
{ … }

static int audio_iio_aux_get_volsw(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
{ … }

static int audio_iio_aux_put_volsw(struct snd_kcontrol *kcontrol,
				   struct snd_ctl_elem_value *ucontrol)
{ … }

static int audio_iio_aux_add_controls(struct snd_soc_component *component,
				      struct audio_iio_aux_chan *chan)
{ … }

/*
 * These data could be on stack but they are pretty big.
 * As ASoC internally copy them and protect them against concurrent accesses
 * (snd_soc_bind_card() protects using client_mutex), keep them in the global
 * data area.
 */
static struct snd_soc_dapm_widget widgets[3];
static struct snd_soc_dapm_route routes[2];

/* Be sure sizes are correct (need 3 widgets and 2 routes) */
static_assert(…);
static_assert(…);

static int audio_iio_aux_add_dapms(struct snd_soc_component *component,
				   struct audio_iio_aux_chan *chan)
{ … }

static int audio_iio_aux_component_probe(struct snd_soc_component *component)
{ … }

static const struct snd_soc_component_driver audio_iio_aux_component_driver = …;

static int audio_iio_aux_probe(struct platform_device *pdev)
{ … }

static const struct of_device_id audio_iio_aux_ids[] = …;
MODULE_DEVICE_TABLE(of, audio_iio_aux_ids);

static struct platform_driver audio_iio_aux_driver = …;
module_platform_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;