1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ADXL313 3-Axis Digital Accelerometer 4 * 5 * Copyright (c) 2021 Lucas Stankus <lucas.p.stankus@gmail.com> 6 * 7 * Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL313.pdf 8 */ 9 10 #include <linux/mod_devicetable.h> 11 #include <linux/module.h> 12 #include <linux/regmap.h> 13 #include <linux/spi/spi.h> 14 #include <linux/property.h> 15 16 #include "adxl313.h" 17 18 static const struct regmap_config adxl31x_spi_regmap_config[] = { 19 [ADXL312] = { 20 .reg_bits = 8, 21 .val_bits = 8, 22 .rd_table = &adxl312_readable_regs_table, 23 .wr_table = &adxl312_writable_regs_table, 24 .max_register = 0x39, 25 /* Setting bits 7 and 6 enables multiple-byte read */ 26 .read_flag_mask = BIT(7) | BIT(6), 27 }, 28 [ADXL313] = { 29 .reg_bits = 8, 30 .val_bits = 8, 31 .rd_table = &adxl313_readable_regs_table, 32 .wr_table = &adxl313_writable_regs_table, 33 .max_register = 0x39, 34 /* Setting bits 7 and 6 enables multiple-byte read */ 35 .read_flag_mask = BIT(7) | BIT(6), 36 }, 37 [ADXL314] = { 38 .reg_bits = 8, 39 .val_bits = 8, 40 .rd_table = &adxl314_readable_regs_table, 41 .wr_table = &adxl314_writable_regs_table, 42 .max_register = 0x39, 43 /* Setting bits 7 and 6 enables multiple-byte read */ 44 .read_flag_mask = BIT(7) | BIT(6), 45 }, 46 }; 47 48 static int adxl313_spi_setup(struct device *dev, struct regmap *regmap) 49 { 50 struct spi_device *spi = container_of(dev, struct spi_device, dev); 51 int ret; 52 53 if (spi->mode & SPI_3WIRE) { 54 ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT, 55 ADXL313_SPI_3WIRE); 56 if (ret) 57 return ret; 58 } 59 60 return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL, 61 ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE); 62 } 63 64 static int adxl313_spi_probe(struct spi_device *spi) 65 { 66 const struct adxl313_chip_info *chip_data; 67 struct regmap *regmap; 68 int ret; 69 70 spi->mode |= SPI_MODE_3; 71 ret = spi_setup(spi); 72 if (ret) 73 return ret; 74 75 /* 76 * Retrieves device specific data as a pointer to a 77 * adxl313_chip_info structure 78 */ 79 chip_data = device_get_match_data(&spi->dev); 80 if (!chip_data) 81 chip_data = (const struct adxl313_chip_info *)spi_get_device_id(spi)->driver_data; 82 83 regmap = devm_regmap_init_spi(spi, 84 &adxl31x_spi_regmap_config[chip_data->type]); 85 86 if (IS_ERR(regmap)) { 87 dev_err(&spi->dev, "Error initializing spi regmap: %ld\n", 88 PTR_ERR(regmap)); 89 return PTR_ERR(regmap); 90 } 91 92 return adxl313_core_probe(&spi->dev, regmap, 93 chip_data, &adxl313_spi_setup); 94 } 95 96 static const struct spi_device_id adxl313_spi_id[] = { 97 { .name = "adxl312", .driver_data = (kernel_ulong_t)&adxl31x_chip_info[ADXL312] }, 98 { .name = "adxl313", .driver_data = (kernel_ulong_t)&adxl31x_chip_info[ADXL313] }, 99 { .name = "adxl314", .driver_data = (kernel_ulong_t)&adxl31x_chip_info[ADXL314] }, 100 { } 101 }; 102 103 MODULE_DEVICE_TABLE(spi, adxl313_spi_id); 104 105 static const struct of_device_id adxl313_of_match[] = { 106 { .compatible = "adi,adxl312", .data = &adxl31x_chip_info[ADXL312] }, 107 { .compatible = "adi,adxl313", .data = &adxl31x_chip_info[ADXL313] }, 108 { .compatible = "adi,adxl314", .data = &adxl31x_chip_info[ADXL314] }, 109 { } 110 }; 111 112 MODULE_DEVICE_TABLE(of, adxl313_of_match); 113 114 static struct spi_driver adxl313_spi_driver = { 115 .driver = { 116 .name = "adxl313_spi", 117 .of_match_table = adxl313_of_match, 118 }, 119 .probe = adxl313_spi_probe, 120 .id_table = adxl313_spi_id, 121 }; 122 123 module_spi_driver(adxl313_spi_driver); 124 125 MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>"); 126 MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver"); 127 MODULE_LICENSE("GPL v2"); 128 MODULE_IMPORT_NS(IIO_ADXL313); 129