82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
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/*
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* ADXL345 3-Axis Digital Accelerometer SPI driver
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*
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* Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*/
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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 "adxl345.h"
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#define ADXL345_MAX_SPI_FREQ_HZ 5000000
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static const struct regmap_config adxl345_spi_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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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 adxl345_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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/* Bail out if max_speed_hz exceeds 5 MHz */
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if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) {
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dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n",
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spi->max_speed_hz);
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return -EINVAL;
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}
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regmap = devm_regmap_init_spi(spi, &adxl345_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 adxl345_core_probe(&spi->dev, regmap, id->name);
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}
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static int adxl345_spi_remove(struct spi_device *spi)
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{
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return adxl345_core_remove(&spi->dev);
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}
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static const struct spi_device_id adxl345_spi_id[] = {
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{ "adxl345", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, adxl345_spi_id);
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static const struct of_device_id adxl345_of_match[] = {
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{ .compatible = "adi,adxl345" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, adxl345_of_match);
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static struct spi_driver adxl345_spi_driver = {
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.driver = {
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.name = "adxl345_spi",
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.of_match_table = adxl345_of_match,
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},
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.probe = adxl345_spi_probe,
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.remove = adxl345_spi_remove,
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.id_table = adxl345_spi_id,
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};
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module_spi_driver(adxl345_spi_driver);
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MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");
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MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
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MODULE_LICENSE("GPL v2");
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