1 // SPDX-License-Identifier: GPL-2.0-only
3 * SPI interface for the BMP280 driver
5 * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c
7 #include <linux/module.h>
8 #include <linux/spi/spi.h>
10 #include <linux/regmap.h>
14 static int bmp280_regmap_spi_write(void *context, const void *data,
17 struct device *dev = context;
18 struct spi_device *spi = to_spi_device(dev);
23 * The SPI register address (= full register address without bit 7) and
24 * the write command (bit7 = RW = '0')
28 return spi_write_then_read(spi, buf, 2, NULL, 0);
31 static int bmp280_regmap_spi_read(void *context, const void *reg,
32 size_t reg_size, void *val, size_t val_size)
34 struct device *dev = context;
35 struct spi_device *spi = to_spi_device(dev);
37 return spi_write_then_read(spi, reg, reg_size, val, val_size);
40 static 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,
47 static int bmp280_spi_probe(struct spi_device *spi)
49 const struct spi_device_id *id = spi_get_device_id(spi);
50 struct regmap *regmap;
51 const struct regmap_config *regmap_config;
54 spi->bits_per_word = 8;
57 dev_err(&spi->dev, "spi_setup failed!\n");
61 switch (id->driver_data) {
63 regmap_config = &bmp180_regmap_config;
67 regmap_config = &bmp280_regmap_config;
73 regmap = devm_regmap_init(&spi->dev,
78 dev_err(&spi->dev, "failed to allocate register map\n");
79 return PTR_ERR(regmap);
82 return bmp280_common_probe(&spi->dev,
89 static const struct of_device_id bmp280_of_spi_match[] = {
90 { .compatible = "bosch,bmp085", },
91 { .compatible = "bosch,bmp180", },
92 { .compatible = "bosch,bmp181", },
93 { .compatible = "bosch,bmp280", },
94 { .compatible = "bosch,bme280", },
97 MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
99 static const struct spi_device_id bmp280_spi_id[] = {
100 { "bmp180", BMP180_CHIP_ID },
101 { "bmp181", BMP180_CHIP_ID },
102 { "bmp280", BMP280_CHIP_ID },
103 { "bme280", BME280_CHIP_ID },
106 MODULE_DEVICE_TABLE(spi, bmp280_spi_id);
108 static struct spi_driver bmp280_spi_driver = {
111 .of_match_table = bmp280_of_spi_match,
112 .pm = &bmp280_dev_pm_ops,
114 .id_table = bmp280_spi_id,
115 .probe = bmp280_spi_probe,
117 module_spi_driver(bmp280_spi_driver);
119 MODULE_DESCRIPTION("BMP280 SPI bus driver");
120 MODULE_LICENSE("GPL");