drivers/iio/accel/adxl313_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ADXL313 3-Axis Digital Accelerometer
   4  *
   5  * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
   6  *
   7  * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
   8  */
   9
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/module.h>
  12 #include <linux/regmap.h>
  13 #include <linux/spi/spi.h>
  14
  15 #include "adxl313.h"
  16
  17 static const struct regmap_config adxl313_spi_regmap_config = {
  18         .reg_bits       = 8,
  19         .val_bits       = 8,
  20         .rd_table       = &adxl313_readable_regs_table,
  21         .wr_table       = &adxl313_writable_regs_table,
  22         .max_register   = 0x39,
  23          /* Setting bits 7 and 6 enables multiple-byte read */
  24         .read_flag_mask = BIT(7) | BIT(6),
  25 };
  26
  27 static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
  28 {
  29         struct spi_device *spi = container_of(dev, struct spi_device, dev);
  30         int ret;
  31
  32         if (spi->mode & SPI_3WIRE) {
  33                 ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
  34                                    ADXL313_SPI_3WIRE);
  35                 if (ret)
  36                         return ret;
  37         }
  38
  39         return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
  40                                   ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
  41 }
  42
  43 static int adxl313_spi_probe(struct spi_device *spi)
  44 {
  45         const struct spi_device_id *id = spi_get_device_id(spi);
  46         struct regmap *regmap;
  47         int ret;
  48
  49         spi->mode |= SPI_MODE_3;
  50         ret = spi_setup(spi);
  51         if (ret)
  52                 return ret;
  53
  54         regmap = devm_regmap_init_spi(spi, &adxl313_spi_regmap_config);
  55         if (IS_ERR(regmap)) {
  56                 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
  57                         PTR_ERR(regmap));
  58                 return PTR_ERR(regmap);
  59         }
  60
  61         return adxl313_core_probe(&spi->dev, regmap, id->name,
  62                                   &adxl313_spi_setup);
  63 }
  64
  65 static const struct spi_device_id adxl313_spi_id[] = {
  66         { "adxl313" },
  67         { }
  68 };
  69
  70 MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
  71
  72 static const struct of_device_id adxl313_of_match[] = {
  73         { .compatible = "adi,adxl313" },
  74         { }
  75 };
  76
  77 MODULE_DEVICE_TABLE(of, adxl313_of_match);
  78
  79 static struct spi_driver adxl313_spi_driver = {
  80         .driver = {
  81                 .name   = "adxl313_spi",
  82                 .of_match_table = adxl313_of_match,
  83         },
  84         .probe          = adxl313_spi_probe,
  85         .id_table       = adxl313_spi_id,
  86 };
  87
  88 module_spi_driver(adxl313_spi_driver);
  89
  90 MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
  91 MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
  92 MODULE_LICENSE("GPL v2");