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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * ADXL345 3-Axis Digital Accelerometer SPI driver4 *5 * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.com>6 */7 8#include <linux/module.h>9#include <linux/regmap.h>10#include <linux/spi/spi.h>11 12#include "adxl345.h"13 14#define ADXL345_MAX_SPI_FREQ_HZ 500000015 16static const struct regmap_config adxl345_spi_regmap_config = {17 .reg_bits = 8,18 .val_bits = 8,19 /* Setting bits 7 and 6 enables multiple-byte read */20 .read_flag_mask = BIT(7) | BIT(6),21};22 23static int adxl345_spi_setup(struct device *dev, struct regmap *regmap)24{25 return regmap_write(regmap, ADXL345_REG_DATA_FORMAT, ADXL345_DATA_FORMAT_SPI_3WIRE);26}27 28static int adxl345_spi_probe(struct spi_device *spi)29{30 struct regmap *regmap;31 32 /* Bail out if max_speed_hz exceeds 5 MHz */33 if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ)34 return dev_err_probe(&spi->dev, -EINVAL, "SPI CLK, %d Hz exceeds 5 MHz\n",35 spi->max_speed_hz);36 37 regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config);38 if (IS_ERR(regmap))39 return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");40 41 if (spi->mode & SPI_3WIRE)42 return adxl345_core_probe(&spi->dev, regmap, adxl345_spi_setup);43 else44 return adxl345_core_probe(&spi->dev, regmap, NULL);45}46 47static const struct adxl345_chip_info adxl345_spi_info = {48 .name = "adxl345",49 .uscale = ADXL345_USCALE,50};51 52static const struct adxl345_chip_info adxl375_spi_info = {53 .name = "adxl375",54 .uscale = ADXL375_USCALE,55};56 57static const struct spi_device_id adxl345_spi_id[] = {58 { "adxl345", (kernel_ulong_t)&adxl345_spi_info },59 { "adxl375", (kernel_ulong_t)&adxl375_spi_info },60 { }61};62MODULE_DEVICE_TABLE(spi, adxl345_spi_id);63 64static const struct of_device_id adxl345_of_match[] = {65 { .compatible = "adi,adxl345", .data = &adxl345_spi_info },66 { .compatible = "adi,adxl375", .data = &adxl375_spi_info },67 { }68};69MODULE_DEVICE_TABLE(of, adxl345_of_match);70 71static const struct acpi_device_id adxl345_acpi_match[] = {72 { "ADS0345", (kernel_ulong_t)&adxl345_spi_info },73 { }74};75MODULE_DEVICE_TABLE(acpi, adxl345_acpi_match);76 77static struct spi_driver adxl345_spi_driver = {78 .driver = {79 .name = "adxl345_spi",80 .of_match_table = adxl345_of_match,81 .acpi_match_table = adxl345_acpi_match,82 },83 .probe = adxl345_spi_probe,84 .id_table = adxl345_spi_id,85};86module_spi_driver(adxl345_spi_driver);87 88MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");89MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");90MODULE_LICENSE("GPL v2");91MODULE_IMPORT_NS(IIO_ADXL345);92