sound/soc/codecs/cs35l41-spi.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/cs35l41-spi.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/cs35l41-spi.c
Extension
.c
Size
2472 bytes
Lines
100
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
//
// cs35l41-spi.c -- CS35l41 SPI driver
//
// Copyright 2017-2021 Cirrus Logic, Inc.
//
// Author: David Rhodes	<david.rhodes@cirrus.com>

#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>

#include "cs35l41.h"

static const struct spi_device_id cs35l41_id_spi[] = {
	{ "cs35l40", 0 },
	{ "cs35l41", 0 },
	{ "cs35l51", 0 },
	{ "cs35l53", 0 },
	{}
};

MODULE_DEVICE_TABLE(spi, cs35l41_id_spi);

static int cs35l41_spi_probe(struct spi_device *spi)
{
	const struct regmap_config *regmap_config = &cs35l41_regmap_spi;
	struct cs35l41_hw_cfg *hw_cfg = dev_get_platdata(&spi->dev);
	struct cs35l41_private *cs35l41;
	int ret;

	cs35l41 = devm_kzalloc(&spi->dev, sizeof(struct cs35l41_private), GFP_KERNEL);
	if (!cs35l41)
		return -ENOMEM;

	spi->max_speed_hz = CS35L41_SPI_MAX_FREQ;
	ret = spi_setup(spi);
	if (ret < 0)
		return ret;

	spi_set_drvdata(spi, cs35l41);
	cs35l41->regmap = devm_regmap_init_spi(spi, regmap_config);
	if (IS_ERR(cs35l41->regmap))
		return dev_err_probe(cs35l41->dev, PTR_ERR(cs35l41->regmap),
				     "Failed to allocate register map\n");

	cs35l41->dev = &spi->dev;
	cs35l41->irq = spi->irq;

	return cs35l41_probe(cs35l41, hw_cfg);
}

static void cs35l41_spi_remove(struct spi_device *spi)
{
	struct cs35l41_private *cs35l41 = spi_get_drvdata(spi);

	cs35l41_remove(cs35l41);
}

#ifdef CONFIG_OF
static const struct of_device_id cs35l41_of_match[] = {
	{ .compatible = "cirrus,cs35l40" },
	{ .compatible = "cirrus,cs35l41" },
	{},
};
MODULE_DEVICE_TABLE(of, cs35l41_of_match);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id cs35l41_acpi_match[] = {
	{ "CSC3541", 0 }, /* Cirrus Logic PnP ID + part ID */
	{ "CLSA3541", 0 }, /* Cirrus Logic PnP ID + part ID */
	{},
};
MODULE_DEVICE_TABLE(acpi, cs35l41_acpi_match);
#endif

static struct spi_driver cs35l41_spi_driver = {
	.driver = {
		.name		= "cs35l41",
		.pm		= pm_ptr(&cs35l41_pm_ops),
		.of_match_table = of_match_ptr(cs35l41_of_match),
		.acpi_match_table = ACPI_PTR(cs35l41_acpi_match),
	},
	.id_table	= cs35l41_id_spi,

Annotation

Implementation Notes