sound/soc/meson/axg-tdmin.c

Source file repositories/reference/linux-study-clean/sound/soc/meson/axg-tdmin.c

File Facts

System
Linux kernel
Corpus path
sound/soc/meson/axg-tdmin.c
Extension
.c
Size
7708 bytes
Lines
261
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 OR MIT)
//
// Copyright (c) 2018 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include "axg-tdm-formatter.h"

#define TDMIN_CTRL			0x00
#define  TDMIN_CTRL_ENABLE		BIT(31)
#define  TDMIN_CTRL_I2S_MODE		BIT(30)
#define  TDMIN_CTRL_RST_OUT		BIT(29)
#define  TDMIN_CTRL_RST_IN		BIT(28)
#define  TDMIN_CTRL_WS_INV		BIT(25)
#define  TDMIN_CTRL_SEL_SHIFT		20
#define  TDMIN_CTRL_IN_BIT_SKEW_MASK	GENMASK(18, 16)
#define  TDMIN_CTRL_IN_BIT_SKEW(x)	((x) << 16)
#define  TDMIN_CTRL_LSB_FIRST		BIT(5)
#define  TDMIN_CTRL_BITNUM_MASK	GENMASK(4, 0)
#define  TDMIN_CTRL_BITNUM(x)		((x) << 0)
#define TDMIN_SWAP			0x04
#define TDMIN_MASK0			0x08
#define TDMIN_MASK1			0x0c
#define TDMIN_MASK2			0x10
#define TDMIN_MASK3			0x14
#define TDMIN_STAT			0x18
#define TDMIN_MUTE_VAL			0x1c
#define TDMIN_MUTE0			0x20
#define TDMIN_MUTE1			0x24
#define TDMIN_MUTE2			0x28
#define TDMIN_MUTE3			0x2c

static const struct regmap_config axg_tdmin_regmap_cfg = {
	.reg_bits	= 32,
	.val_bits	= 32,
	.reg_stride	= 4,
	.max_register	= TDMIN_MUTE3,
};

static const char * const axg_tdmin_sel_texts[] = {
	"IN 0", "IN 1", "IN 2",  "IN 3",  "IN 4",  "IN 5",  "IN 6",  "IN 7",
	"IN 8", "IN 9", "IN 10", "IN 11", "IN 12", "IN 13", "IN 14", "IN 15",
};

/* Change to special mux control to reset dapm */
static SOC_ENUM_SINGLE_DECL(axg_tdmin_sel_enum, TDMIN_CTRL,
			    TDMIN_CTRL_SEL_SHIFT, axg_tdmin_sel_texts);

static const struct snd_kcontrol_new axg_tdmin_in_mux =
	SOC_DAPM_ENUM("Input Source", axg_tdmin_sel_enum);

static struct snd_soc_dai *
axg_tdmin_get_be(struct snd_soc_dapm_widget *w)
{
	struct snd_soc_dapm_path *p;
	struct snd_soc_dai *be;

	snd_soc_dapm_widget_for_each_source_path(w, p) {
		if (!p->connect)
			continue;

		if (p->source->id == snd_soc_dapm_dai_out)
			return (struct snd_soc_dai *)p->source->priv;

		be = axg_tdmin_get_be(p->source);
		if (be)
			return be;
	}

	return NULL;
}

static struct axg_tdm_stream *
axg_tdmin_get_tdm_stream(struct snd_soc_dapm_widget *w)
{
	struct snd_soc_dai *be = axg_tdmin_get_be(w);

	if (!be)
		return NULL;

	return snd_soc_dai_dma_data_get_capture(be);
}

static void axg_tdmin_enable(struct regmap *map)
{

Annotation

Implementation Notes