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_setup(struct device *dev, struct regmap *regmap) 24 { 25 return regmap_write(regmap, ADXL345_REG_DATA_FORMAT, ADXL345_DATA_FORMAT_SPI_3WIRE); 26 } 27 28 static int adxl345_spi_probe(struct spi_device *spi) 29 { 30 struct regmap *regmap; 31 32 /* Bail out if max_speed_hz exceeds 5 MHz */ 33 if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) 34 return dev_err_probe(&spi->dev, -EINVAL, "SPI CLK, %d Hz exceeds 5 MHz\n", 35 spi->max_speed_hz); 36 37 regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config); 38 if (IS_ERR(regmap)) 39 return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n"); 40 41 if (spi->mode & SPI_3WIRE) 42 return adxl345_core_probe(&spi->dev, regmap, adxl345_spi_setup); 43 else 44 return adxl345_core_probe(&spi->dev, regmap, NULL); 45 } 46 47 static const struct adxl345_chip_info adxl345_spi_info = { 48 .name = "adxl345", 49 .uscale = ADXL345_USCALE, 50 }; 51 52 static const struct adxl345_chip_info adxl375_spi_info = { 53 .name = "adxl375", 54 .uscale = ADXL375_USCALE, 55 }; 56 57 static const struct spi_device_id adxl345_spi_id[] = { 58 { "adxl345", (kernel_ulong_t)&adxl345_spi_info }, 59 { "adxl375", (kernel_ulong_t)&adxl375_spi_info }, 60 { } 61 }; 62 MODULE_DEVICE_TABLE(spi, adxl345_spi_id); 63 64 static const struct of_device_id adxl345_of_match[] = { 65 { .compatible = "adi,adxl345", .data = &adxl345_spi_info }, 66 { .compatible = "adi,adxl375", .data = &adxl375_spi_info }, 67 { } 68 }; 69 MODULE_DEVICE_TABLE(of, adxl345_of_match); 70 71 static const struct acpi_device_id adxl345_acpi_match[] = { 72 { "ADS0345", (kernel_ulong_t)&adxl345_spi_info }, 73 { } 74 }; 75 MODULE_DEVICE_TABLE(acpi, adxl345_acpi_match); 76 77 static struct spi_driver adxl345_spi_driver = { 78 .driver = { 79 .name = "adxl345_spi", 80 .of_match_table = adxl345_of_match, 81 .acpi_match_table = adxl345_acpi_match, 82 }, 83 .probe = adxl345_spi_probe, 84 .id_table = adxl345_spi_id, 85 }; 86 module_spi_driver(adxl345_spi_driver); 87 88 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>"); 89 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); 90 MODULE_LICENSE("GPL v2"); 91 MODULE_IMPORT_NS(IIO_ADXL345); 92