sound/soc/meson/aiu-codec-ctrl.c

Source file repositories/reference/linux-study-clean/sound/soc/meson/aiu-codec-ctrl.c

File Facts

System
Linux kernel
Corpus path
sound/soc/meson/aiu-codec-ctrl.c
Extension
.c
Size
4760 bytes
Lines
155
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: implementation source
Status
source 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
//
// Copyright (c) 2020 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>

#include <linux/bitfield.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include <dt-bindings/sound/meson-aiu.h>
#include "aiu.h"
#include "meson-codec-glue.h"

#define CTRL_CLK_SEL		GENMASK(1, 0)
#define CTRL_DATA_SEL_SHIFT	4
#define CTRL_DATA_SEL		(0x3 << CTRL_DATA_SEL_SHIFT)

static const char * const aiu_codec_ctrl_mux_texts[] = {
	"DISABLED", "PCM", "I2S",
};

static int aiu_codec_ctrl_mux_put_enum(struct snd_kcontrol *kcontrol,
				       struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_component *component = snd_soc_dapm_kcontrol_to_component(kcontrol);
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_to_dapm(kcontrol);
	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
	unsigned int mux, changed;

	if (ucontrol->value.enumerated.item[0] >= e->items)
		return -EINVAL;

	mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
	changed = snd_soc_component_test_bits(component, e->reg,
					      CTRL_DATA_SEL,
					      FIELD_PREP(CTRL_DATA_SEL, mux));

	if (!changed)
		return 0;

	/* Force disconnect of the mux while updating */
	snd_soc_dapm_mux_update_power(dapm, kcontrol, 0, NULL, NULL);

	/* Reset the source first */
	snd_soc_component_update_bits(component, e->reg,
				      CTRL_CLK_SEL |
				      CTRL_DATA_SEL,
				      FIELD_PREP(CTRL_CLK_SEL, 0) |
				      FIELD_PREP(CTRL_DATA_SEL, 0));

	/* Set the appropriate source */
	snd_soc_component_update_bits(component, e->reg,
				      CTRL_CLK_SEL |
				      CTRL_DATA_SEL,
				      FIELD_PREP(CTRL_CLK_SEL, mux) |
				      FIELD_PREP(CTRL_DATA_SEL, mux));

	snd_soc_dapm_mux_update_power(dapm, kcontrol, mux, e, NULL);

	return 1;
}

static SOC_ENUM_SINGLE_DECL(aiu_hdmi_ctrl_mux_enum, AIU_HDMI_CLK_DATA_CTRL,
			    CTRL_DATA_SEL_SHIFT,
			    aiu_codec_ctrl_mux_texts);

static const struct snd_kcontrol_new aiu_hdmi_ctrl_mux =
	SOC_DAPM_ENUM_EXT("HDMI Source", aiu_hdmi_ctrl_mux_enum,
			  snd_soc_dapm_get_enum_double,
			  aiu_codec_ctrl_mux_put_enum);

static const struct snd_soc_dapm_widget aiu_hdmi_ctrl_widgets[] = {
	SND_SOC_DAPM_MUX("HDMI CTRL SRC", SND_SOC_NOPM, 0, 0,
			 &aiu_hdmi_ctrl_mux),
};

static const struct snd_soc_dai_ops aiu_codec_ctrl_input_ops = {
	.probe		= meson_codec_glue_input_dai_probe,
	.remove		= meson_codec_glue_input_dai_remove,
	.hw_params	= meson_codec_glue_input_hw_params,
	.set_fmt	= meson_codec_glue_input_set_fmt,
};

static const struct snd_soc_dai_ops aiu_codec_ctrl_output_ops = {
	.startup	= meson_codec_glue_output_startup,
};

#define AIU_CODEC_CTRL_FORMATS					\
	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |	\

Annotation

Implementation Notes