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"); 93