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
bmi088_regmap_spi_write(void * context,const void * data,size_t count)18 static 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
bmi088_regmap_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)26 static 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
39 static const struct regmap_bus bmi088_regmap_bus = {
40 .write = bmi088_regmap_spi_write,
41 .read = bmi088_regmap_spi_read,
42 };
43
bmi088_accel_probe(struct spi_device * spi)44 static 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
bmi088_accel_remove(struct spi_device * spi)61 static void bmi088_accel_remove(struct spi_device *spi)
62 {
63 bmi088_accel_core_remove(&spi->dev);
64 }
65
66 static 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 };
72 MODULE_DEVICE_TABLE(of, bmi088_of_match);
73
74 static 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 };
80 MODULE_DEVICE_TABLE(spi, bmi088_accel_id);
81
82 static 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 };
92 module_spi_driver(bmi088_accel_driver);
93
94 MODULE_AUTHOR("Niek van Agt <niek.van.agt@topicproducts.com>");
95 MODULE_LICENSE("GPL v2");
96 MODULE_DESCRIPTION("BMI088 accelerometer driver (SPI)");
97 MODULE_IMPORT_NS(IIO_BMI088);
98