93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ADXL313 3-Axis Digital Accelerometer
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*
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* Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
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*
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* Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
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*/
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include "adxl313.h"
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static const struct regmap_config adxl313_spi_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.rd_table = &adxl313_readable_regs_table,
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.wr_table = &adxl313_writable_regs_table,
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.max_register = 0x39,
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/* Setting bits 7 and 6 enables multiple-byte read */
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.read_flag_mask = BIT(7) | BIT(6),
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};
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static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
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{
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struct spi_device *spi = container_of(dev, struct spi_device, dev);
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int ret;
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if (spi->mode & SPI_3WIRE) {
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ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
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ADXL313_SPI_3WIRE);
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if (ret)
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return ret;
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}
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return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
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ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
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}
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static int adxl313_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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struct regmap *regmap;
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int ret;
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spi->mode |= SPI_MODE_3;
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ret = spi_setup(spi);
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if (ret)
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return ret;
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regmap = devm_regmap_init_spi(spi, &adxl313_spi_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
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PTR_ERR(regmap));
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return PTR_ERR(regmap);
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}
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return adxl313_core_probe(&spi->dev, regmap, id->name,
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&adxl313_spi_setup);
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}
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static const struct spi_device_id adxl313_spi_id[] = {
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{ "adxl313" },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
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static const struct of_device_id adxl313_of_match[] = {
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{ .compatible = "adi,adxl313" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, adxl313_of_match);
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static struct spi_driver adxl313_spi_driver = {
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.driver = {
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.name = "adxl313_spi",
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.of_match_table = adxl313_of_match,
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},
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.probe = adxl313_spi_probe,
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.id_table = adxl313_spi_id,
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};
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module_spi_driver(adxl313_spi_driver);
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MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
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MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
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MODULE_LICENSE("GPL v2");
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