1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SPI interface for the BMP280 driver
4 *
5 * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c
6 */
7#include <linux/module.h>
8#include <linux/spi/spi.h>
9#include <linux/err.h>
10#include <linux/regmap.h>
11
12#include "bmp280.h"
13
14static int bmp280_regmap_spi_write(void *context, const void *data,
15                                   size_t count)
16{
17	struct device *dev = context;
18	struct spi_device *spi = to_spi_device(dev);
19	u8 buf[2];
20
21	memcpy(buf, data, 2);
22	/*
23	 * The SPI register address (= full register address without bit 7) and
24	 * the write command (bit7 = RW = '0')
25	 */
26	buf[0] &= ~0x80;
27
28	return spi_write_then_read(spi, buf, 2, NULL, 0);
29}
30
31static int bmp280_regmap_spi_read(void *context, const void *reg,
32                                  size_t reg_size, void *val, size_t val_size)
33{
34	struct device *dev = context;
35	struct spi_device *spi = to_spi_device(dev);
36
37	return spi_write_then_read(spi, reg, reg_size, val, val_size);
38}
39
40static struct regmap_bus bmp280_regmap_bus = {
41	.write = bmp280_regmap_spi_write,
42	.read = bmp280_regmap_spi_read,
43	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
44	.val_format_endian_default = REGMAP_ENDIAN_BIG,
45};
46
47static int bmp280_spi_probe(struct spi_device *spi)
48{
49	const struct spi_device_id *id = spi_get_device_id(spi);
50	const struct bmp280_chip_info *chip_info;
51	struct regmap *regmap;
52	int ret;
53
54	spi->bits_per_word = 8;
55	ret = spi_setup(spi);
56	if (ret < 0) {
57		dev_err(&spi->dev, "spi_setup failed!\n");
58		return ret;
59	}
60
61	chip_info = device_get_match_data(&spi->dev);
62	if (!chip_info)
63		chip_info = (const struct bmp280_chip_info *) id->driver_data;
64
65	regmap = devm_regmap_init(&spi->dev,
66				  &bmp280_regmap_bus,
67				  &spi->dev,
68				  chip_info->regmap_config);
69	if (IS_ERR(regmap)) {
70		dev_err(&spi->dev, "failed to allocate register map\n");
71		return PTR_ERR(regmap);
72	}
73
74	return bmp280_common_probe(&spi->dev,
75				   regmap,
76				   chip_info,
77				   id->name,
78				   spi->irq);
79}
80
81static const struct of_device_id bmp280_of_spi_match[] = {
82	{ .compatible = "bosch,bmp085", .data = &bmp180_chip_info },
83	{ .compatible = "bosch,bmp180", .data = &bmp180_chip_info },
84	{ .compatible = "bosch,bmp181", .data = &bmp180_chip_info },
85	{ .compatible = "bosch,bmp280", .data = &bmp280_chip_info },
86	{ .compatible = "bosch,bme280", .data = &bmp280_chip_info },
87	{ .compatible = "bosch,bmp380", .data = &bmp380_chip_info },
88	{ .compatible = "bosch,bmp580", .data = &bmp580_chip_info },
89	{ },
90};
91MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
92
93static const struct spi_device_id bmp280_spi_id[] = {
94	{ "bmp085", (kernel_ulong_t)&bmp180_chip_info },
95	{ "bmp180", (kernel_ulong_t)&bmp180_chip_info },
96	{ "bmp181", (kernel_ulong_t)&bmp180_chip_info },
97	{ "bmp280", (kernel_ulong_t)&bmp280_chip_info },
98	{ "bme280", (kernel_ulong_t)&bmp280_chip_info },
99	{ "bmp380", (kernel_ulong_t)&bmp380_chip_info },
100	{ "bmp580", (kernel_ulong_t)&bmp580_chip_info },
101	{ }
102};
103MODULE_DEVICE_TABLE(spi, bmp280_spi_id);
104
105static struct spi_driver bmp280_spi_driver = {
106	.driver = {
107		.name = "bmp280",
108		.of_match_table = bmp280_of_spi_match,
109		.pm = pm_ptr(&bmp280_dev_pm_ops),
110	},
111	.id_table = bmp280_spi_id,
112	.probe = bmp280_spi_probe,
113};
114module_spi_driver(bmp280_spi_driver);
115
116MODULE_DESCRIPTION("BMP280 SPI bus driver");
117MODULE_LICENSE("GPL");
118MODULE_IMPORT_NS(IIO_BMP280);
119