mirror of
https://github.com/torvalds/linux
synced 2024-10-10 05:16:04 +00:00
iio: pressure: bmp280: add SPI interface driver
This patch mimics the SPI functionality found in the misc driver in drivers/misc/bh085-spi.c to make it possible to reuse the existing BMP280/BMP180/BMP085 driver with all clients of the other driver. The adoption is straight-forward since like the other driver, it is a simple matter of using regmap. This driver is also so obviously inspired/copied from the old misc driver in drivers/misc/bmp085.c that I just took the liberty to add in the authors of the other drivers + self in the core driver file. The MISC driver also supports a variant named "BMP181" so include that here to be complete in comparison to the old driver. The bus mapping code for SPI was written by Akinobu Mita. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Tested-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
parent
17118843a5
commit
b26b4e9170
|
@ -7,17 +7,20 @@ menu "Pressure sensors"
|
||||||
|
|
||||||
config BMP280
|
config BMP280
|
||||||
tristate "Bosch Sensortec BMP180/BMP280 pressure sensor I2C driver"
|
tristate "Bosch Sensortec BMP180/BMP280 pressure sensor I2C driver"
|
||||||
depends on I2C
|
depends on (I2C || SPI_MASTER)
|
||||||
depends on !(BMP085_I2C=y || BMP085_I2C=m)
|
depends on !(BMP085_I2C=y || BMP085_I2C=m)
|
||||||
|
depends on !(BMP085_SPI=y || BMP085_SPI=m)
|
||||||
select REGMAP
|
select REGMAP
|
||||||
select BMP280_I2C if (I2C)
|
select BMP280_I2C if (I2C)
|
||||||
|
select BMP280_SPI if (SPI_MASTER)
|
||||||
help
|
help
|
||||||
Say yes here to build support for Bosch Sensortec BMP180 and BMP280
|
Say yes here to build support for Bosch Sensortec BMP180 and BMP280
|
||||||
pressure and temperature sensors. Also supports the BE280 with
|
pressure and temperature sensors. Also supports the BE280 with
|
||||||
an additional humidity sensor channel.
|
an additional humidity sensor channel.
|
||||||
|
|
||||||
To compile this driver as a module, choose M here: the modules
|
To compile this driver as a module, choose M here: the core module
|
||||||
will be called bmp280-i2c and bmp280.
|
will be called bmp280 and you will also get bmp280-i2c for I2C
|
||||||
|
and/or bmp280-spi for SPI support.
|
||||||
|
|
||||||
config BMP280_I2C
|
config BMP280_I2C
|
||||||
tristate
|
tristate
|
||||||
|
@ -25,6 +28,12 @@ config BMP280_I2C
|
||||||
depends on I2C
|
depends on I2C
|
||||||
select REGMAP_I2C
|
select REGMAP_I2C
|
||||||
|
|
||||||
|
config BMP280_SPI
|
||||||
|
tristate
|
||||||
|
depends on BMP280
|
||||||
|
depends on SPI_MASTER
|
||||||
|
select REGMAP
|
||||||
|
|
||||||
config HID_SENSOR_PRESS
|
config HID_SENSOR_PRESS
|
||||||
depends on HID_SENSOR_HUB
|
depends on HID_SENSOR_HUB
|
||||||
select IIO_BUFFER
|
select IIO_BUFFER
|
||||||
|
|
|
@ -6,6 +6,7 @@
|
||||||
obj-$(CONFIG_BMP280) += bmp280.o
|
obj-$(CONFIG_BMP280) += bmp280.o
|
||||||
bmp280-objs := bmp280-core.o bmp280-regmap.o
|
bmp280-objs := bmp280-core.o bmp280-regmap.o
|
||||||
obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
|
obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
|
||||||
|
obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o
|
||||||
obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
|
obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
|
||||||
obj-$(CONFIG_HP03) += hp03.o
|
obj-$(CONFIG_HP03) += hp03.o
|
||||||
obj-$(CONFIG_MPL115) += mpl115.o
|
obj-$(CONFIG_MPL115) += mpl115.o
|
||||||
|
|
|
@ -1,5 +1,9 @@
|
||||||
/*
|
/*
|
||||||
|
* Copyright (c) 2010 Christoph Mair <christoph.mair@gmail.com>
|
||||||
|
* Copyright (c) 2012 Bosch Sensortec GmbH
|
||||||
|
* Copyright (c) 2012 Unixphere AB
|
||||||
* Copyright (c) 2014 Intel Corporation
|
* Copyright (c) 2014 Intel Corporation
|
||||||
|
* Copyright (c) 2016 Linus Walleij <linus.walleij@linaro.org>
|
||||||
*
|
*
|
||||||
* Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.
|
* Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.
|
||||||
*
|
*
|
||||||
|
|
123
drivers/iio/pressure/bmp280-spi.c
Normal file
123
drivers/iio/pressure/bmp280-spi.c
Normal file
|
@ -0,0 +1,123 @@
|
||||||
|
/*
|
||||||
|
* 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);
|
||||||
|
}
|
||||||
|
|
||||||
|
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,
|
||||||
|
},
|
||||||
|
.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");
|
Loading…
Reference in a new issue