126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
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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 int bmp280_spi_remove(struct spi_device *spi)
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{
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return bmp280_common_remove(&spi->dev);
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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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.remove = bmp280_spi_remove,
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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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