LXR linux/drivers/iio/accel/adxl345

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ADXL345 3-Axis Digital Accelerometer SPI driver
   4 *
   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         5000000
  15
  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_probe(struct spi_device *spi)
  24{
  25        const struct spi_device_id *id = spi_get_device_id(spi);
  26        struct regmap *regmap;
  27
  28        /* Bail out if max_speed_hz exceeds 5 MHz */
  29        if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) {
  30                dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n",
  31                        spi->max_speed_hz);
  32                return -EINVAL;
  33        }
  34
  35        regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config);
  36        if (IS_ERR(regmap)) {
  37                dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
  38                        PTR_ERR(regmap));
  39                return PTR_ERR(regmap);
  40        }
  41
  42        return adxl345_core_probe(&spi->dev, regmap, id->driver_data, id->name);
  43}
  44
  45static int adxl345_spi_remove(struct spi_device *spi)
  46{
  47        return adxl345_core_remove(&spi->dev);
  48}
  49
  50static const struct spi_device_id adxl345_spi_id[] = {
  51        { "adxl345", ADXL345 },
  52        { "adxl375", ADXL375 },
  53        { }
  54};
  55
  56MODULE_DEVICE_TABLE(spi, adxl345_spi_id);
  57
  58static const struct of_device_id adxl345_of_match[] = {
  59        { .compatible = "adi,adxl345" },
  60        { .compatible = "adi,adxl375" },
  61        { },
  62};
  63
  64MODULE_DEVICE_TABLE(of, adxl345_of_match);
  65
  66static struct spi_driver adxl345_spi_driver = {
  67        .driver = {
  68                .name   = "adxl345_spi",
  69                .of_match_table = adxl345_of_match,
  70        },
  71        .probe          = adxl345_spi_probe,
  72        .remove         = adxl345_spi_remove,
  73        .id_table       = adxl345_spi_id,
  74};
  75
  76module_spi_driver(adxl345_spi_driver);
  77
  78MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");
  79MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
  80MODULE_LICENSE("GPL v2");
  81