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

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

File Facts

System
Linux kernel
Corpus path
sound/soc/meson/aiu-acodec-ctrl.c
Extension
.c
Size
6607 bytes
Lines
207
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_DIN_EN			15
#define CTRL_CLK_INV			BIT(14)
#define CTRL_LRCLK_INV			BIT(13)
#define CTRL_I2S_IN_BCLK_SRC		BIT(11)
#define CTRL_DIN_LRCLK_SRC_SHIFT	6
#define CTRL_DIN_LRCLK_SRC		(0x3 << CTRL_DIN_LRCLK_SRC_SHIFT)
#define CTRL_BCLK_MCLK_SRC		GENMASK(5, 4)
#define CTRL_DIN_SKEW			GENMASK(3, 2)
#define CTRL_I2S_OUT_LANE_SRC		0

#define AIU_ACODEC_OUT_CHMAX		2

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

static int aiu_acodec_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_DIN_LRCLK_SRC,
					      FIELD_PREP(CTRL_DIN_LRCLK_SRC,
							 mux));

	if (!changed)
		return 0;

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

	snd_soc_component_update_bits(component, e->reg,
				      CTRL_DIN_LRCLK_SRC |
				      CTRL_BCLK_MCLK_SRC,
				      FIELD_PREP(CTRL_DIN_LRCLK_SRC, mux) |
				      FIELD_PREP(CTRL_BCLK_MCLK_SRC, mux));

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

	return 1;
}

static SOC_ENUM_SINGLE_DECL(aiu_acodec_ctrl_mux_enum, AIU_ACODEC_CTRL,
			    CTRL_DIN_LRCLK_SRC_SHIFT,
			    aiu_acodec_ctrl_mux_texts);

static const struct snd_kcontrol_new aiu_acodec_ctrl_mux =
	SOC_DAPM_ENUM_EXT("ACodec Source", aiu_acodec_ctrl_mux_enum,
			  snd_soc_dapm_get_enum_double,
			  aiu_acodec_ctrl_mux_put_enum);

static const struct snd_kcontrol_new aiu_acodec_ctrl_out_enable =
	SOC_DAPM_SINGLE_AUTODISABLE("Switch", AIU_ACODEC_CTRL,
				    CTRL_DIN_EN, 1, 0);

static const struct snd_soc_dapm_widget aiu_acodec_ctrl_widgets[] = {
	SND_SOC_DAPM_MUX("ACODEC SRC", SND_SOC_NOPM, 0, 0,
			 &aiu_acodec_ctrl_mux),
	SND_SOC_DAPM_SWITCH("ACODEC OUT EN", SND_SOC_NOPM, 0, 0,
			    &aiu_acodec_ctrl_out_enable),
};

static int aiu_acodec_ctrl_input_hw_params(struct snd_pcm_substream *substream,
					   struct snd_pcm_hw_params *params,
					   struct snd_soc_dai *dai)
{
	struct meson_codec_glue_input *data;
	int ret;

Annotation

Implementation Notes