drivers/iio/accel/adxl345_spi.c

   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
  16 static 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
  23 static 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
  45 static int adxl345_spi_remove(struct spi_device *spi)
  46 {
  47         return adxl345_core_remove(&spi->dev);
  48 }
  49
  50 static const struct spi_device_id adxl345_spi_id[] = {
  51         { "adxl345", ADXL345 },
  52         { "adxl375", ADXL375 },
  53         { }
  54 };
  55
  56 MODULE_DEVICE_TABLE(spi, adxl345_spi_id);
  57
  58 static const struct of_device_id adxl345_of_match[] = {
  59         { .compatible = "adi,adxl345" },
  60         { .compatible = "adi,adxl375" },
  61         { },
  62 };
  63
  64 MODULE_DEVICE_TABLE(of, adxl345_of_match);
  65
  66 static 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
  76 module_spi_driver(adxl345_spi_driver);
  77
  78 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");
  79 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
  80 MODULE_LICENSE("GPL v2");