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 const struct spi_device_id *id = spi_get_device_id(spi); 26 struct regmap *regmap; 27 28 /* Bail out if max_speed_hz exceeds 5 MHz */ 29 if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) { 30 dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n", 31 spi->max_speed_hz); 32 return -EINVAL; 33 } 34 35 regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config); 36 if (IS_ERR(regmap)) { 37 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n", 38 PTR_ERR(regmap)); 39 return PTR_ERR(regmap); 40 } 41 42 return adxl345_core_probe(&spi->dev, regmap, id->driver_data, id->name); 43 } 44 45 static const struct spi_device_id adxl345_spi_id[] = { 46 { "adxl345", ADXL345 }, 47 { "adxl375", ADXL375 }, 48 { } 49 }; 50 51 MODULE_DEVICE_TABLE(spi, adxl345_spi_id); 52 53 static const struct of_device_id adxl345_of_match[] = { 54 { .compatible = "adi,adxl345" }, 55 { .compatible = "adi,adxl375" }, 56 { }, 57 }; 58 59 MODULE_DEVICE_TABLE(of, adxl345_of_match); 60 61 static struct spi_driver adxl345_spi_driver = { 62 .driver = { 63 .name = "adxl345_spi", 64 .of_match_table = adxl345_of_match, 65 }, 66 .probe = adxl345_spi_probe, 67 .id_table = adxl345_spi_id, 68 }; 69 70 module_spi_driver(adxl345_spi_driver); 71 72 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>"); 73 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); 74 MODULE_LICENSE("GPL v2"); 75