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 adxl345_chip_info adxl345_spi_info = { 40 .name = "adxl345", 41 .uscale = ADXL345_USCALE, 42 }; 43 44 static const struct adxl345_chip_info adxl375_spi_info = { 45 .name = "adxl375", 46 .uscale = ADXL375_USCALE, 47 }; 48 49 static const struct spi_device_id adxl345_spi_id[] = { 50 { "adxl345", (kernel_ulong_t)&adxl345_spi_info }, 51 { "adxl375", (kernel_ulong_t)&adxl375_spi_info }, 52 { } 53 }; 54 MODULE_DEVICE_TABLE(spi, adxl345_spi_id); 55 56 static const struct of_device_id adxl345_of_match[] = { 57 { .compatible = "adi,adxl345", .data = &adxl345_spi_info }, 58 { .compatible = "adi,adxl375", .data = &adxl375_spi_info }, 59 { } 60 }; 61 MODULE_DEVICE_TABLE(of, adxl345_of_match); 62 63 static const struct acpi_device_id adxl345_acpi_match[] = { 64 { "ADS0345", (kernel_ulong_t)&adxl345_spi_info }, 65 { } 66 }; 67 MODULE_DEVICE_TABLE(acpi, adxl345_acpi_match); 68 69 static struct spi_driver adxl345_spi_driver = { 70 .driver = { 71 .name = "adxl345_spi", 72 .of_match_table = adxl345_of_match, 73 .acpi_match_table = adxl345_acpi_match, 74 }, 75 .probe = adxl345_spi_probe, 76 .id_table = adxl345_spi_id, 77 }; 78 module_spi_driver(adxl345_spi_driver); 79 80 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>"); 81 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); 82 MODULE_LICENSE("GPL v2"); 83 MODULE_IMPORT_NS(IIO_ADXL345); 84