iio/accel/adxl313_spi.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * ADXL313 3-Axis Digital Accelerometer
0004  *
0005  * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com>
0006  *
0007  * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf
0008  */
0009
0010 #include <linux/mod_devicetable.h>
0011 #include <linux/module.h>
0012 #include <linux/regmap.h>
0013 #include <linux/spi/spi.h>
0014
0015 #include "adxl313.h"
0016
0017 static const struct regmap_config adxl313_spi_regmap_config = {
0018     .reg_bits   = 8,
0019     .val_bits   = 8,
0020     .rd_table   = &adxl313_readable_regs_table,
0021     .wr_table   = &adxl313_writable_regs_table,
0022     .max_register   = 0x39,
0023      /* Setting bits 7 and 6 enables multiple-byte read */
0024     .read_flag_mask = BIT(7) | BIT(6),
0025 };
0026
0027 static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
0028 {
0029     struct spi_device *spi = container_of(dev, struct spi_device, dev);
0030     int ret;
0031
0032     if (spi->mode & SPI_3WIRE) {
0033         ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
0034                    ADXL313_SPI_3WIRE);
0035         if (ret)
0036             return ret;
0037     }
0038
0039     return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
0040                   ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
0041 }
0042
0043 static int adxl313_spi_probe(struct spi_device *spi)
0044 {
0045     const struct spi_device_id *id = spi_get_device_id(spi);
0046     struct regmap *regmap;
0047     int ret;
0048
0049     spi->mode |= SPI_MODE_3;
0050     ret = spi_setup(spi);
0051     if (ret)
0052         return ret;
0053
0054     regmap = devm_regmap_init_spi(spi, &adxl313_spi_regmap_config);
0055     if (IS_ERR(regmap)) {
0056         dev_err(&spi->dev, "Error initializing spi regmap: %ld\n",
0057             PTR_ERR(regmap));
0058         return PTR_ERR(regmap);
0059     }
0060
0061     return adxl313_core_probe(&spi->dev, regmap, id->name,
0062                   &adxl313_spi_setup);
0063 }
0064
0065 static const struct spi_device_id adxl313_spi_id[] = {
0066     { "adxl313" },
0067     { }
0068 };
0069
0070 MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
0071
0072 static const struct of_device_id adxl313_of_match[] = {
0073     { .compatible = "adi,adxl313" },
0074     { }
0075 };
0076
0077 MODULE_DEVICE_TABLE(of, adxl313_of_match);
0078
0079 static struct spi_driver adxl313_spi_driver = {
0080     .driver = {
0081         .name   = "adxl313_spi",
0082         .of_match_table = adxl313_of_match,
0083     },
0084     .probe      = adxl313_spi_probe,
0085     .id_table   = adxl313_spi_id,
0086 };
0087
0088 module_spi_driver(adxl313_spi_driver);
0089
0090 MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
0091 MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
0092 MODULE_LICENSE("GPL v2");
0093 MODULE_IMPORT_NS(IIO_ADXL313);