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.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
drivers/iio/pressure/Kconfig | 15 ++++++--
drivers/iio/pressure/Makefile | 1 +
drivers/iio/pressure/bmp280-core.c | 4 ++
drivers/iio/pressure/bmp280-spi.c | 78 ++++++++++++++++++++++++++++++++++++++
4 files changed, 95 insertions(+), 3 deletions(-)
create mode 100644 drivers/iio/pressure/bmp280-spi.c
diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 40aaf4295d30..ff94f6b77f72 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -7,14 +7,16 @@ menu "Pressure sensors"
config BMP280
tristate "Bosch Sensortec BMP180/BMP280 pressure sensor I2C driver"
- depends on I2C
+ depends on (I2C || SPI_MASTER)
select BMP280_I2C if (I2C)
+ select BMP280_SPI if (SPI_MASTER)
help
Say yes here to build support for Bosch Sensortec BMP180 and BMP280
pressure and temperature sensors mounted on the I2C bus.
- To compile this driver as a module, choose M here: the modules
- will be called bmp280-i2c and bmp280.
+ To compile this driver as a module, choose M here: the core module
+ will be called bmp280 and you will also get bmp280-i2c for I2C
+ and/or bmp280-spi for SPI support.
config BMP280_I2C
tristate
@@ -23,6 +25,13 @@ config BMP280_I2C
depends on !(BMP085_I2C=y || BMP085_I2C=m)
select REGMAP_I2C
+config BMP280_SPI
+ tristate
+ depends on BMP280
+ depends on SPI_MASTER
+ depends on !(BMP085_SPI=y || BMP085_SPI=m)
+ select REGMAP_SPI
+
config HID_SENSOR_PRESS
depends on HID_SENSOR_HUB
select IIO_BUFFER
diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
index 736f4305fe46..7f395bed5e88 100644
--- a/drivers/iio/pressure/Makefile
+++ b/drivers/iio/pressure/Makefile
@@ -6,6 +6,7 @@
obj-$(CONFIG_BMP280) += bmp280.o
bmp280-objs := bmp280-core.o bmp280-regmap.o
obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
+obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o
obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
obj-$(CONFIG_HP03) += hp03.o
obj-$(CONFIG_MPL115) += mpl115.o
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 5455e9c44953..af422d224db4 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -1,5 +1,9 @@
/*
+ * Copyright (c) 2010 Christoph Mair <christoph.mair@xxxxxxxxx>
+ * Copyright (c) 2012 Bosch Sensortec GmbH
+ * Copyright (c) 2012 Unixphere AB
* Copyright (c) 2014 Intel Corporation
+ * Copyright (c) 2016 Linus Walleij <linus.walleij@xxxxxxxxxx>
*
* Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor.
*
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
new file mode 100644
index 000000000000..a24ea5f62c5e
--- /dev/null
+++ b/drivers/iio/pressure/bmp280-spi.c
@@ -0,0 +1,78 @@
+/*
+ * 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_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:
+ regmap_config = &bmp280_regmap_config;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap = devm_regmap_init_spi(spi, 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 const struct of_device_id bmp280_of_spi_match[] = {
+ { .compatible = "bosch,bmp085", },
+ { .compatible = "bosch,bmp180", },
+ { .compatible = "bosch,bmp181", },
+ { .compatible = "bosch,bmp280", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, bmp085_of_spi_match);
+
+static const struct spi_device_id bmp280_spi_id[] = {
+ { "bmp180", BMP180_CHIP_ID },
+ { "bmp181", BMP180_CHIP_ID },
+ { "bmp280", BMP280_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,
+};
+module_spi_driver(bmp280_spi_driver);
+
+MODULE_DESCRIPTION("BMP085 SPI bus driver");
+MODULE_LICENSE("GPL");
--
2.4.11
--
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