adxl313_spi.c

  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
 18static 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		.volatile_reg	= adxl313_is_volatile_reg,
 28		.cache_type	= REGCACHE_MAPLE,
 29	},
 30	[ADXL313] = {
 31		.reg_bits	= 8,
 32		.val_bits	= 8,
 33		.rd_table	= &adxl313_readable_regs_table,
 34		.wr_table	= &adxl313_writable_regs_table,
 35		.max_register	= 0x39,
 36		/* Setting bits 7 and 6 enables multiple-byte read */
 37		.read_flag_mask	= BIT(7) | BIT(6),
 38		.volatile_reg	= adxl313_is_volatile_reg,
 39		.cache_type	= REGCACHE_MAPLE,
 40	},
 41	[ADXL314] = {
 42		.reg_bits	= 8,
 43		.val_bits	= 8,
 44		.rd_table	= &adxl314_readable_regs_table,
 45		.wr_table	= &adxl314_writable_regs_table,
 46		.max_register	= 0x39,
 47		/* Setting bits 7 and 6 enables multiple-byte read */
 48		.read_flag_mask	= BIT(7) | BIT(6),
 49		.volatile_reg	= adxl313_is_volatile_reg,
 50		.cache_type	= REGCACHE_MAPLE,
 51	},
 52};
 53
 54static int adxl313_spi_setup(struct device *dev, struct regmap *regmap)
 55{
 56	struct spi_device *spi = container_of(dev, struct spi_device, dev);
 57	int ret;
 58
 59	if (spi->mode & SPI_3WIRE) {
 60		ret = regmap_write(regmap, ADXL313_REG_DATA_FORMAT,
 61				   ADXL313_SPI_3WIRE);
 62		if (ret)
 63			return ret;
 64	}
 65
 66	return regmap_update_bits(regmap, ADXL313_REG_POWER_CTL,
 67				  ADXL313_I2C_DISABLE, ADXL313_I2C_DISABLE);
 68}
 69
 70static int adxl313_spi_probe(struct spi_device *spi)
 71{
 72	const struct adxl313_chip_info *chip_data;
 73	struct regmap *regmap;
 74	int ret;
 75
 76	spi->mode |= SPI_MODE_3;
 77	ret = spi_setup(spi);
 78	if (ret)
 79		return ret;
 80
 81	chip_data = spi_get_device_match_data(spi);
 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
 96static 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
103MODULE_DEVICE_TABLE(spi, adxl313_spi_id);
104
105static 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
112MODULE_DEVICE_TABLE(of, adxl313_of_match);
113
114static 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
123module_spi_driver(adxl313_spi_driver);
124
125MODULE_AUTHOR("Lucas Stankus <lucas.p.stankus@gmail.com>");
126MODULE_DESCRIPTION("ADXL313 3-Axis Digital Accelerometer SPI driver");
127MODULE_LICENSE("GPL v2");
128MODULE_IMPORT_NS("IIO_ADXL313");