125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
|
|
* SPI interface for the BMP280 driver
|
|
*
|
|
* Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/err.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "bmp280.h"
|
|
|
|
static int bmp280_regmap_spi_write(void *context, const void *data,
|
|
size_t count)
|
|
{
|
|
struct device *dev = context;
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
u8 buf[2];
|
|
|
|
memcpy(buf, data, 2);
|
|
/*
|
|
* The SPI register address (= full register address without bit 7) and
|
|
* the write command (bit7 = RW = '0')
|
|
*/
|
|
buf[0] &= ~0x80;
|
|
|
|
return spi_write_then_read(spi, buf, 2, NULL, 0);
|
|
}
|
|
|
|
static int bmp280_regmap_spi_read(void *context, const void *reg,
|
|
size_t reg_size, void *val, size_t val_size)
|
|
{
|
|
struct device *dev = context;
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
|
|
return spi_write_then_read(spi, reg, reg_size, val, val_size);
|
|
}
|
|
|
|
static struct regmap_bus bmp280_regmap_bus = {
|
|
.write = bmp280_regmap_spi_write,
|
|
.read = bmp280_regmap_spi_read,
|
|
.reg_format_endian_default = REGMAP_ENDIAN_BIG,
|
|
.val_format_endian_default = REGMAP_ENDIAN_BIG,
|
|
};
|
|
|
|
static int bmp280_spi_probe(struct spi_device *spi)
|
|
{
|
|
const struct spi_device_id *id = spi_get_device_id(spi);
|
|
struct regmap *regmap;
|
|
const struct regmap_config *regmap_config;
|
|
int ret;
|
|
|
|
spi->bits_per_word = 8;
|
|
ret = spi_setup(spi);
|
|
if (ret < 0) {
|
|
dev_err(&spi->dev, "spi_setup failed!\n");
|
|
return ret;
|
|
}
|
|
|
|
switch (id->driver_data) {
|
|
case BMP180_CHIP_ID:
|
|
regmap_config = &bmp180_regmap_config;
|
|
break;
|
|
case BMP280_CHIP_ID:
|
|
case BME280_CHIP_ID:
|
|
regmap_config = &bmp280_regmap_config;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
regmap = devm_regmap_init(&spi->dev,
|
|
&bmp280_regmap_bus,
|
|
&spi->dev,
|
|
regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
dev_err(&spi->dev, "failed to allocate register map\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
return bmp280_common_probe(&spi->dev,
|
|
regmap,
|
|
id->driver_data,
|
|
id->name,
|
|
spi->irq);
|
|
}
|
|
|
|
static int bmp280_spi_remove(struct spi_device *spi)
|
|
{
|
|
return bmp280_common_remove(&spi->dev);
|
|
}
|
|
|
|
static const struct of_device_id bmp280_of_spi_match[] = {
|
|
{ .compatible = "bosch,bmp085", },
|
|
{ .compatible = "bosch,bmp180", },
|
|
{ .compatible = "bosch,bmp181", },
|
|
{ .compatible = "bosch,bmp280", },
|
|
{ .compatible = "bosch,bme280", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
|
|
|
|
static const struct spi_device_id bmp280_spi_id[] = {
|
|
{ "bmp180", BMP180_CHIP_ID },
|
|
{ "bmp181", BMP180_CHIP_ID },
|
|
{ "bmp280", BMP280_CHIP_ID },
|
|
{ "bme280", BME280_CHIP_ID },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, bmp280_spi_id);
|
|
|
|
static struct spi_driver bmp280_spi_driver = {
|
|
.driver = {
|
|
.name = "bmp280",
|
|
.of_match_table = bmp280_of_spi_match,
|
|
.pm = &bmp280_dev_pm_ops,
|
|
},
|
|
.id_table = bmp280_spi_id,
|
|
.probe = bmp280_spi_probe,
|
|
.remove = bmp280_spi_remove,
|
|
};
|
|
module_spi_driver(bmp280_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("BMP280 SPI bus driver");
|
|
MODULE_LICENSE("GPL");
|