drivers/iio/accel/bma220_i2c.c

Source file repositories/reference/linux-study-clean/drivers/iio/accel/bma220_i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/accel/bma220_i2c.c
Extension
.c
Size
1785 bytes
Lines
70
Domain
Driver Families
Bucket
drivers/iio
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-only
/*
 * Bosch triaxial acceleration sensor
 *
 * Copyright (c) 2025 Petre Rodan <petre.rodan@subdimension.ro>
 *
 * Datasheet: https://media.digikey.com/pdf/Data%20Sheets/Bosch/BMA220.pdf
 * I2C address is either 0x0b or 0x0a depending on CSB (pin 10)
 */

#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/types.h>

#include "bma220.h"

static int bma220_set_wdt(struct regmap *regmap, const u8 val)
{
	return regmap_update_bits(regmap, BMA220_REG_WDT, BMA220_WDT_MASK,
				  FIELD_PREP(BMA220_WDT_MASK, val));
}

static int bma220_i2c_probe(struct i2c_client *client)
{
	struct regmap *regmap;
	int ret;

	regmap = devm_regmap_init_i2c(client, &bma220_i2c_regmap_config);
	if (IS_ERR(regmap))
		return dev_err_probe(&client->dev, PTR_ERR(regmap),
				     "failed to create regmap\n");

	ret = bma220_common_probe(&client->dev, regmap, client->irq);
	if (ret)
		return ret;

	return bma220_set_wdt(regmap, BMA220_WDT_1MS);
}

static const struct of_device_id bma220_i2c_match[] = {
	{ .compatible = "bosch,bma220" },
	{ }
};
MODULE_DEVICE_TABLE(of, bma220_i2c_match);

static const struct i2c_device_id bma220_i2c_id[] = {
	{ "bma220" },
	{ }
};
MODULE_DEVICE_TABLE(i2c, bma220_i2c_id);

static struct i2c_driver bma220_i2c_driver = {
	.driver = {
		.name = "bma220_i2c",
		.pm = pm_sleep_ptr(&bma220_pm_ops),
		.of_match_table = bma220_i2c_match,
	},
	.probe = bma220_i2c_probe,
	.id_table = bma220_i2c_id,
};
module_i2c_driver(bma220_i2c_driver);

MODULE_AUTHOR("Petre Rodan <petre.rodan@subdimension.ro>");
MODULE_DESCRIPTION("Bosch triaxial acceleration sensor i2c driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("IIO_BOSCH_BMA220");

Annotation

Implementation Notes