1 /* 2 * ADXL345 3-Axis Digital Accelerometer SPI driver 3 * 4 * Copyright (c) 2017 Eva Rachel Retuya <eraretuya@gmail.com> 5 * 6 * This file is subject to the terms and conditions of version 2 of 7 * the GNU General Public License. See the file COPYING in the main 8 * directory of this archive for more details. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/regmap.h> 13 #include <linux/spi/spi.h> 14 15 #include "adxl345.h" 16 17 #define ADXL345_MAX_SPI_FREQ_HZ 5000000 18 19 static const struct regmap_config adxl345_spi_regmap_config = { 20 .reg_bits = 8, 21 .val_bits = 8, 22 /* Setting bits 7 and 6 enables multiple-byte read */ 23 .read_flag_mask = BIT(7) | BIT(6), 24 }; 25 26 static int adxl345_spi_probe(struct spi_device *spi) 27 { 28 const struct spi_device_id *id = spi_get_device_id(spi); 29 struct regmap *regmap; 30 31 /* Bail out if max_speed_hz exceeds 5 MHz */ 32 if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) { 33 dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n", 34 spi->max_speed_hz); 35 return -EINVAL; 36 } 37 38 regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config); 39 if (IS_ERR(regmap)) { 40 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n", 41 PTR_ERR(regmap)); 42 return PTR_ERR(regmap); 43 } 44 45 return adxl345_core_probe(&spi->dev, regmap, id->name); 46 } 47 48 static int adxl345_spi_remove(struct spi_device *spi) 49 { 50 return adxl345_core_remove(&spi->dev); 51 } 52 53 static const struct spi_device_id adxl345_spi_id[] = { 54 { "adxl345", 0 }, 55 { } 56 }; 57 58 MODULE_DEVICE_TABLE(spi, adxl345_spi_id); 59 60 static const struct of_device_id adxl345_of_match[] = { 61 { .compatible = "adi,adxl345" }, 62 { }, 63 }; 64 65 MODULE_DEVICE_TABLE(of, adxl345_of_match); 66 67 static struct spi_driver adxl345_spi_driver = { 68 .driver = { 69 .name = "adxl345_spi", 70 .of_match_table = adxl345_of_match, 71 }, 72 .probe = adxl345_spi_probe, 73 .remove = adxl345_spi_remove, 74 .id_table = adxl345_spi_id, 75 }; 76 77 module_spi_driver(adxl345_spi_driver); 78 79 MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>"); 80 MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); 81 MODULE_LICENSE("GPL v2"); 82