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 struct regmap *regmap; 26 27 /* Bail out if max_speed_hz exceeds 5 MHz */ 28 if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) 29 return dev_err_probe(&spi->dev, -EINVAL, "SPI CLK, %d Hz exceeds 5 MHz\n", 30 spi->max_speed_hz); 31 32 regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config); 33 if (IS_ERR(regmap)) 34 return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n"); 35 36 return adxl345_core_probe(&spi->dev, regmap); 37 } 38 39 static const struct spi_device_id adxl345_spi_id[] = { 40 { "adxl345", ADXL345 }, 41 { "adxl375", ADXL375 }, 42 { } 43 }; 44 MODULE_DEVICE_TABLE(spi, adxl345_spi_id); 45 46 static const struct of_device_id adxl345_of_match[] = { 47 { .compatible = "adi,adxl345", .data = (const void *)ADXL345 }, 48 { .compatible = "adi,adxl375", .data = (const void *)ADXL375 }, 49 { } 50 }; 51 MODULE_DEVICE_TABLE(of, adxl345_of_match); 52 53 static const struct acpi_device_id adxl345_acpi_match[] = { 54 { "ADS0345", ADXL345 }, 55 { } 56 }; 57 MODULE_DEVICE_TABLE(acpi, adxl345_acpi_match); 58 59 static struct spi_driver adxl345_spi_driver = { 60 .driver = { 61 .name = "adxl345_spi", 62 .of_match_table = adxl345_of_match, 63 .acpi_match_table = adxl345_acpi_match, 64 }, 65 .probe = adxl345_spi_probe, 66 .id_table = adxl345_spi_id, 67 }; 68 module_spi_driver(adxl345_spi_driver); 69 70 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>"); 71 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); 72 MODULE_LICENSE("GPL v2"); 73 MODULE_IMPORT_NS(IIO_ADXL345); 74