1// SPDX-License-Identifier: GPL-2.0
2/*
3 * 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
4 *  - BMI088
5 *  - BMI085
6 *  - BMI090L
7 *
8 * Copyright (c) 2018-2020, Topic Embedded Products
9 */
10
11#include <linux/module.h>
12#include <linux/regmap.h>
13#include <linux/slab.h>
14#include <linux/spi/spi.h>
15
16#include "bmi088-accel.h"
17
18static int bmi088_regmap_spi_write(void *context, const void *data, size_t count)
19{
20	struct spi_device *spi = context;
21
22	/* Write register is same as generic SPI */
23	return spi_write(spi, data, count);
24}
25
26static int bmi088_regmap_spi_read(void *context, const void *reg,
27				size_t reg_size, void *val, size_t val_size)
28{
29	struct spi_device *spi = context;
30	u8 addr[2];
31
32	addr[0] = *(u8 *)reg;
33	addr[0] |= BIT(7); /* Set RW = '1' */
34	addr[1] = 0; /* Read requires a dummy byte transfer */
35
36	return spi_write_then_read(spi, addr, sizeof(addr), val, val_size);
37}
38
39static struct regmap_bus bmi088_regmap_bus = {
40	.write = bmi088_regmap_spi_write,
41	.read = bmi088_regmap_spi_read,
42};
43
44static int bmi088_accel_probe(struct spi_device *spi)
45{
46	struct regmap *regmap;
47	const struct spi_device_id *id = spi_get_device_id(spi);
48
49	regmap = devm_regmap_init(&spi->dev, &bmi088_regmap_bus,
50			spi, &bmi088_regmap_conf);
51
52	if (IS_ERR(regmap)) {
53		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
54		return PTR_ERR(regmap);
55	}
56
57	return bmi088_accel_core_probe(&spi->dev, regmap, spi->irq,
58					id->driver_data);
59}
60
61static void bmi088_accel_remove(struct spi_device *spi)
62{
63	bmi088_accel_core_remove(&spi->dev);
64}
65
66static const struct of_device_id bmi088_of_match[] = {
67	{ .compatible = "bosch,bmi085-accel" },
68	{ .compatible = "bosch,bmi088-accel" },
69	{ .compatible = "bosch,bmi090l-accel" },
70	{}
71};
72MODULE_DEVICE_TABLE(of, bmi088_of_match);
73
74static const struct spi_device_id bmi088_accel_id[] = {
75	{"bmi085-accel",  BOSCH_BMI085},
76	{"bmi088-accel",  BOSCH_BMI088},
77	{"bmi090l-accel", BOSCH_BMI090L},
78	{}
79};
80MODULE_DEVICE_TABLE(spi, bmi088_accel_id);
81
82static struct spi_driver bmi088_accel_driver = {
83	.driver = {
84		.name	= "bmi088_accel_spi",
85		.pm	= pm_ptr(&bmi088_accel_pm_ops),
86		.of_match_table = bmi088_of_match,
87	},
88	.probe		= bmi088_accel_probe,
89	.remove		= bmi088_accel_remove,
90	.id_table	= bmi088_accel_id,
91};
92module_spi_driver(bmi088_accel_driver);
93
94MODULE_AUTHOR("Niek van Agt <niek.van.agt@topicproducts.com>");
95MODULE_LICENSE("GPL v2");
96MODULE_DESCRIPTION("BMI088 accelerometer driver (SPI)");
97MODULE_IMPORT_NS(IIO_BMI088);
98