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120 lines
2.9 KiB
120 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* SPI interface for the BMP280 driver |
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* |
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* Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c |
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*/ |
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#include <linux/module.h> |
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#include <linux/spi/spi.h> |
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#include <linux/err.h> |
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#include <linux/regmap.h> |
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#include "bmp280.h" |
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static int bmp280_regmap_spi_write(void *context, const void *data, |
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size_t count) |
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{ |
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struct device *dev = context; |
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struct spi_device *spi = to_spi_device(dev); |
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u8 buf[2]; |
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memcpy(buf, data, 2); |
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/* |
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* The SPI register address (= full register address without bit 7) and |
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* the write command (bit7 = RW = '0') |
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*/ |
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buf[0] &= ~0x80; |
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return spi_write_then_read(spi, buf, 2, NULL, 0); |
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} |
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static int bmp280_regmap_spi_read(void *context, const void *reg, |
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size_t reg_size, void *val, size_t val_size) |
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{ |
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struct device *dev = context; |
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struct spi_device *spi = to_spi_device(dev); |
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return spi_write_then_read(spi, reg, reg_size, val, val_size); |
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} |
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static struct regmap_bus bmp280_regmap_bus = { |
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.write = bmp280_regmap_spi_write, |
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.read = bmp280_regmap_spi_read, |
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.reg_format_endian_default = REGMAP_ENDIAN_BIG, |
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.val_format_endian_default = REGMAP_ENDIAN_BIG, |
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}; |
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static int bmp280_spi_probe(struct spi_device *spi) |
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{ |
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const struct spi_device_id *id = spi_get_device_id(spi); |
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struct regmap *regmap; |
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const struct regmap_config *regmap_config; |
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int ret; |
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spi->bits_per_word = 8; |
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ret = spi_setup(spi); |
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if (ret < 0) { |
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dev_err(&spi->dev, "spi_setup failed!\n"); |
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return ret; |
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} |
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switch (id->driver_data) { |
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case BMP180_CHIP_ID: |
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regmap_config = &bmp180_regmap_config; |
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break; |
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case BMP280_CHIP_ID: |
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case BME280_CHIP_ID: |
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regmap_config = &bmp280_regmap_config; |
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break; |
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default: |
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return -EINVAL; |
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} |
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regmap = devm_regmap_init(&spi->dev, |
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&bmp280_regmap_bus, |
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&spi->dev, |
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regmap_config); |
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if (IS_ERR(regmap)) { |
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dev_err(&spi->dev, "failed to allocate register map\n"); |
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return PTR_ERR(regmap); |
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} |
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return bmp280_common_probe(&spi->dev, |
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regmap, |
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id->driver_data, |
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id->name, |
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spi->irq); |
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} |
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static const struct of_device_id bmp280_of_spi_match[] = { |
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{ .compatible = "bosch,bmp085", }, |
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{ .compatible = "bosch,bmp180", }, |
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{ .compatible = "bosch,bmp181", }, |
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{ .compatible = "bosch,bmp280", }, |
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{ .compatible = "bosch,bme280", }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, bmp280_of_spi_match); |
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static const struct spi_device_id bmp280_spi_id[] = { |
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{ "bmp180", BMP180_CHIP_ID }, |
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{ "bmp181", BMP180_CHIP_ID }, |
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{ "bmp280", BMP280_CHIP_ID }, |
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{ "bme280", BME280_CHIP_ID }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(spi, bmp280_spi_id); |
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static struct spi_driver bmp280_spi_driver = { |
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.driver = { |
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.name = "bmp280", |
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.of_match_table = bmp280_of_spi_match, |
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.pm = &bmp280_dev_pm_ops, |
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}, |
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.id_table = bmp280_spi_id, |
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.probe = bmp280_spi_probe, |
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}; |
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module_spi_driver(bmp280_spi_driver); |
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MODULE_DESCRIPTION("BMP280 SPI bus driver"); |
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MODULE_LICENSE("GPL");
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