sound/soc/codecs/cs35l45-spi.c

Source file repositories/reference/linux-study-clean/sound/soc/codecs/cs35l45-spi.c

File Facts

System
Linux kernel
Corpus path
sound/soc/codecs/cs35l45-spi.c
Extension
.c
Size
1872 bytes
Lines
79
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
//
// cs35l45-spi.c -- CS35L45 SPI driver
//
// Copyright 2019-2022 Cirrus Logic, Inc.
//
// Author: James Schulman <james.schulman@cirrus.com>

#include <linux/device.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>

#include "cs35l45.h"

static int cs35l45_spi_probe(struct spi_device *spi)
{
	struct cs35l45_private *cs35l45;
	struct device *dev = &spi->dev;
	int ret;

	cs35l45 = devm_kzalloc(dev, sizeof(struct cs35l45_private), GFP_KERNEL);
	if (cs35l45 == NULL)
		return -ENOMEM;

	spi->max_speed_hz = CS35L45_SPI_MAX_FREQ;
	spi_setup(spi);

	spi_set_drvdata(spi, cs35l45);
	cs35l45->regmap = devm_regmap_init_spi(spi, &cs35l45_spi_regmap);
	if (IS_ERR(cs35l45->regmap)) {
		ret = PTR_ERR(cs35l45->regmap);
		dev_err(dev, "Failed to allocate register map: %d\n", ret);
		return ret;
	}

	cs35l45->dev = dev;
	cs35l45->irq = spi->irq;
	cs35l45->bus_type = CONTROL_BUS_SPI;

	return cs35l45_probe(cs35l45);
}

static void cs35l45_spi_remove(struct spi_device *spi)
{
	struct cs35l45_private *cs35l45 = spi_get_drvdata(spi);

	cs35l45_remove(cs35l45);
}

static const struct of_device_id cs35l45_of_match[] = {
	{ .compatible = "cirrus,cs35l45" },
	{},
};
MODULE_DEVICE_TABLE(of, cs35l45_of_match);

static const struct spi_device_id cs35l45_id_spi[] = {
	{ "cs35l45", 0 },
	{}
};
MODULE_DEVICE_TABLE(spi, cs35l45_id_spi);

static struct spi_driver cs35l45_spi_driver = {
	.driver = {
		.name		= "cs35l45",
		.of_match_table = cs35l45_of_match,
		.pm		= pm_ptr(&cs35l45_pm_ops),
	},
	.id_table	= cs35l45_id_spi,
	.probe		= cs35l45_spi_probe,
	.remove		= cs35l45_spi_remove,
};
module_spi_driver(cs35l45_spi_driver);

MODULE_DESCRIPTION("SPI CS35L45 driver");
MODULE_AUTHOR("James Schulman, Cirrus Logic Inc, <james.schulman@cirrus.com>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("SND_SOC_CS35L45");

Annotation

Implementation Notes