smi330_spi.c

 1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
 2/*
 3 * Copyright (c) 2025 Robert Bosch GmbH.
 4 */
 5#include <linux/mod_devicetable.h>
 6#include <linux/module.h>
 7#include <linux/regmap.h>
 8#include <linux/spi/spi.h>
 9
10#include "smi330.h"
11
12static int smi330_regmap_spi_read(void *context, const void *reg_buf,
13				  size_t reg_size, void *val_buf,
14				  size_t val_size)
15{
16	struct spi_device *spi = context;
17
18	/* Insert pad byte for reading */
19	u8 reg[] = { *(u8 *)reg_buf, 0 };
20
21	if (reg_size + 1 != ARRAY_SIZE(reg)) {
22		dev_err(&spi->dev, "Invalid register size %zu\n", reg_size);
23		return -EINVAL;
24	}
25
26	return spi_write_then_read(spi, reg, ARRAY_SIZE(reg), val_buf,
27				   val_size);
28}
29
30static int smi330_regmap_spi_write(void *context, const void *data,
31				   size_t count)
32{
33	struct spi_device *spi = context;
34
35	return spi_write(spi, data, count);
36}
37
38static const struct regmap_bus smi330_regmap_bus = {
39	.read = smi330_regmap_spi_read,
40	.write = smi330_regmap_spi_write,
41	.read_flag_mask = 0x80,
42};
43
44static int smi330_spi_probe(struct spi_device *spi)
45{
46	struct regmap *regmap;
47
48	regmap = devm_regmap_init(&spi->dev, &smi330_regmap_bus, &spi->dev,
49				  &smi330_regmap_config);
50	if (IS_ERR(regmap))
51		return dev_err_probe(&spi->dev, PTR_ERR(regmap),
52				     "Failed to initialize SPI Regmap\n");
53
54	return smi330_core_probe(&spi->dev, regmap);
55}
56
57static const struct spi_device_id smi330_spi_device_id[] = {
58	{ .name = "smi330" },
59	{ }
60};
61MODULE_DEVICE_TABLE(spi, smi330_spi_device_id);
62
63static const struct of_device_id smi330_of_match[] = {
64	{ .compatible = "bosch,smi330" },
65	{ }
66};
67MODULE_DEVICE_TABLE(of, smi330_of_match);
68
69static struct spi_driver smi330_spi_driver = {
70	.probe = smi330_spi_probe,
71	.id_table = smi330_spi_device_id,
72	.driver = {
73		.of_match_table = smi330_of_match,
74		.name = "smi330_spi",
75	},
76};
77module_spi_driver(smi330_spi_driver);
78
79MODULE_AUTHOR("Stefan Gutmann <stefan.gutmann@de.bosch.com>");
80MODULE_AUTHOR("Roman Huber <roman.huber@de.bosch.com>");
81MODULE_AUTHOR("Filip Andrei <Andrei.Filip@ro.bosch.com>");
82MODULE_AUTHOR("Drimbarean Avram Andrei <Avram-Andrei.Drimbarean@ro.bosch.com>");
83MODULE_DESCRIPTION("Bosch SMI330 SPI driver");
84MODULE_LICENSE("Dual BSD/GPL");
85MODULE_IMPORT_NS("IIO_SMI330");