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
16static 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
23static 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
45static int adxl345_spi_remove(struct spi_device *spi)
46{
47	return adxl345_core_remove(&spi->dev);
48}
49
50static const struct spi_device_id adxl345_spi_id[] = {
51	{ "adxl345", ADXL345 },
52	{ "adxl375", ADXL375 },
53	{ }
54};
55
56MODULE_DEVICE_TABLE(spi, adxl345_spi_id);
57
58static const struct of_device_id adxl345_of_match[] = {
59	{ .compatible = "adi,adxl345" },
60	{ .compatible = "adi,adxl375" },
61	{ },
62};
63
64MODULE_DEVICE_TABLE(of, adxl345_of_match);
65
66static struct spi_driver adxl345_spi_driver = {
67	.driver = {
68		.name	= "adxl345_spi",
69		.of_match_table = adxl345_of_match,
70	},
71	.probe		= adxl345_spi_probe,
72	.remove		= adxl345_spi_remove,
73	.id_table	= adxl345_spi_id,
74};
75
76module_spi_driver(adxl345_spi_driver);
77
78MODULE_AUTHOR("Eva Rachel Retuya <eraretuya@gmail.com>");
79MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver");
80MODULE_LICENSE("GPL v2");
81