drivers/iio/accel/adxl313_spi.c

Source file repositories/reference/linux-study-clean/drivers/iio/accel/adxl313_spi.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/accel/adxl313_spi.c
Extension
.c
Size
3563 bytes
Lines
129
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
/*
 * ADXL313 3-Axis Digital Accelerometer
 *
 * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
 *
 * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
 */

#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/property.h>

#include "adxl313.h"

static const struct regmap_config adxl31x_spi_regmap_config[] = {
	[ADXL312] = {
		.reg_bits	= 8,
		.val_bits	= 8,
		.rd_table	= &adxl312_readable_regs_table,
		.wr_table	= &adxl312_writable_regs_table,
		.max_register	= 0x39,
		/* Setting bits 7 and 6 enables multiple-byte read */
		.read_flag_mask	= BIT(7) | BIT(6),
		.volatile_reg	= adxl313_is_volatile_reg,
		.cache_type	= REGCACHE_MAPLE,
	},
	[ADXL313] = {
		.reg_bits	= 8,
		.val_bits	= 8,
		.rd_table	= &adxl313_readable_regs_table,
		.wr_table	= &adxl313_writable_regs_table,
		.max_register	= 0x39,
		/* Setting bits 7 and 6 enables multiple-byte read */
		.read_flag_mask	= BIT(7) | BIT(6),
		.volatile_reg	= adxl313_is_volatile_reg,
		.cache_type	= REGCACHE_MAPLE,
	},
	[ADXL314] = {
		.reg_bits	= 8,
		.val_bits	= 8,
		.rd_table	= &adxl314_readable_regs_table,
		.wr_table	= &adxl314_writable_regs_table,
		.max_register	= 0x39,
		/* Setting bits 7 and 6 enables multiple-byte read */
		.read_flag_mask	= BIT(7) | BIT(6),
		.volatile_reg	= adxl313_is_volatile_reg,
		.cache_type	= REGCACHE_MAPLE,
	},
};

static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
{
	struct spi_device *spi = container_of(dev, struct spi_device, dev);
	int ret;

	if (spi->mode & SPI_3WIRE) {
		ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
				   ADXL313_SPI_3WIRE);
		if (ret)
			return ret;
	}

	return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
				  ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
}

static int adxl313_spi_probe(struct spi_device *spi)
{
	const struct adxl313_chip_info *chip_data;
	struct regmap *regmap;
	int ret;

	spi->mode |= SPI_MODE_3;
	ret = spi_setup(spi);
	if (ret)
		return ret;

	chip_data = spi_get_device_match_data(spi);

	regmap = devm_regmap_init_spi(spi,
				      &adxl31x_spi_regmap_config[chip_data->type]);

	if (IS_ERR(regmap)) {
		dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
			PTR_ERR(regmap));
		return PTR_ERR(regmap);
	}

Annotation

Implementation Notes