1// SPDX-License-Identifier: GPL-2.0
2/*
3 * 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
4 *  - BMI088
5 *
6 * Copyright (c) 2018-2020, Topic Embedded Products
7 */
8
9#include <linux/module.h>
10#include <linux/regmap.h>
11#include <linux/slab.h>
12#include <linux/spi/spi.h>
13
14#include "bmi088-accel.h"
15
16static int bmi088_regmap_spi_write(void *context, const void *data, size_t count)
17{
18	struct spi_device *spi = context;
19
20	/* Write register is same as generic SPI */
21	return spi_write(spi, data, count);
22}
23
24static int bmi088_regmap_spi_read(void *context, const void *reg,
25				size_t reg_size, void *val, size_t val_size)
26{
27	struct spi_device *spi = context;
28	u8 addr[2];
29
30	addr[0] = *(u8 *)reg;
31	addr[0] |= BIT(7); /* Set RW = '1' */
32	addr[1] = 0; /* Read requires a dummy byte transfer */
33
34	return spi_write_then_read(spi, addr, sizeof(addr), val, val_size);
35}
36
37static struct regmap_bus bmi088_regmap_bus = {
38	.write = bmi088_regmap_spi_write,
39	.read = bmi088_regmap_spi_read,
40};
41
42static int bmi088_accel_probe(struct spi_device *spi)
43{
44	struct regmap *regmap;
45	const struct spi_device_id *id = spi_get_device_id(spi);
46
47	regmap = devm_regmap_init(&spi->dev, &bmi088_regmap_bus,
48			spi, &bmi088_regmap_conf);
49
50	if (IS_ERR(regmap)) {
51		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
52		return PTR_ERR(regmap);
53	}
54
55	return bmi088_accel_core_probe(&spi->dev, regmap, spi->irq,
56					id->driver_data);
57}
58
59static void bmi088_accel_remove(struct spi_device *spi)
60{
61	bmi088_accel_core_remove(&spi->dev);
62}
63
64static const struct of_device_id bmi088_of_match[] = {
65	{ .compatible = "bosch,bmi085-accel" },
66	{ .compatible = "bosch,bmi088-accel" },
67	{ .compatible = "bosch,bmi090l-accel" },
68	{}
69};
70MODULE_DEVICE_TABLE(of, bmi088_of_match);
71
72static const struct spi_device_id bmi088_accel_id[] = {
73	{"bmi085-accel",  BOSCH_BMI085},
74	{"bmi088-accel",  BOSCH_BMI088},
75	{"bmi090l-accel", BOSCH_BMI090L},
76	{}
77};
78MODULE_DEVICE_TABLE(spi, bmi088_accel_id);
79
80static struct spi_driver bmi088_accel_driver = {
81	.driver = {
82		.name	= "bmi088_accel_spi",
83		.pm	= pm_ptr(&bmi088_accel_pm_ops),
84		.of_match_table = bmi088_of_match,
85	},
86	.probe		= bmi088_accel_probe,
87	.remove		= bmi088_accel_remove,
88	.id_table	= bmi088_accel_id,
89};
90module_spi_driver(bmi088_accel_driver);
91
92MODULE_AUTHOR("Niek van Agt <niek.van.agt@topicproducts.com>");
93MODULE_LICENSE("GPL v2");
94MODULE_DESCRIPTION("BMI088 accelerometer driver (SPI)");
95MODULE_IMPORT_NS(IIO_BMI088);
96