iio: pressure: bmp280: split off an I2C Kconfig entry

This creates a separate BMP280_I2C Kconfig entry that gets selected
by BMP280 for I2C transport. As we currently only support I2C
transport there is not much practical change other than getting
a separate object file (or module) for the I2C driver part. The
old Kconfig symbol BMP280 will still select the stuff we need so
that oldconfig and old defconfigs works fine.
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>

drivers/iio/pressure/Kconfig

@@ -6,17 +6,24 @@
 menu "Pressure sensors"
 
 config BMP280
-	tristate "Bosch Sensortec BMP180 and BMP280 pressure sensor driver"
+	tristate "Bosch Sensortec BMP180/BMP280 pressure sensor I2C driver"
 	depends on I2C
 	depends on !(BMP085_I2C=y || BMP085_I2C=m)
-	select REGMAP_I2C
+	select REGMAP
+	select BMP280_I2C if (I2C)
 	help
 	  Say yes here to build support for Bosch Sensortec BMP180 and BMP280
 	  pressure and temperature sensors. Also supports the BE280 with
-	  an additional humidty sensor channel.
+	  an additional humidity sensor channel.
 
-	  To compile this driver as a module, choose M here: the module
-	  will be called bmp280.
+	  To compile this driver as a module, choose M here: the modules
+	  will be called bmp280-i2c and bmp280.
+
+config BMP280_I2C
+	tristate
+	depends on BMP280
+	depends on I2C
+	select REGMAP_I2C
 
 config HID_SENSOR_PRESS
 	depends on HID_SENSOR_HUB

drivers/iio/pressure/Makefile

@@ -4,7 +4,8 @@
 
 # When adding new entries keep the list in alphabetical order
 obj-$(CONFIG_BMP280) += bmp280.o
-bmp280-objs := bmp280-core.o bmp280-regmap.o bmp280-i2c.o
+bmp280-objs := bmp280-core.o bmp280-regmap.o
+obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
 obj-$(CONFIG_HID_SENSOR_PRESS)   += hid-sensor-press.o
 obj-$(CONFIG_HP03) += hp03.o
 obj-$(CONFIG_MPL115) += mpl115.o

drivers/iio/pressure/bmp280-core.c

@@ -16,6 +16,7 @@
 #define pr_fmt(fmt) "bmp280: " fmt
 
 #include <linux/device.h>
+#include <linux/module.h>
 #include <linux/regmap.h>
 #include <linux/delay.h>
 #include <linux/iio/iio.h>
@@ -955,6 +956,7 @@ int bmp280_common_probe(struct device *dev,
 	regulator_disable(data->vddd);
 	return ret;
 }
+EXPORT_SYMBOL(bmp280_common_probe);
 
 int bmp280_common_remove(struct device *dev)
 {
@@ -966,3 +968,8 @@ int bmp280_common_remove(struct device *dev)
 	regulator_disable(data->vddd);
 	return 0;
 }
+EXPORT_SYMBOL(bmp280_common_remove);
+
+MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
+MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
+MODULE_LICENSE("GPL v2");

drivers/iio/pressure/bmp280-regmap.c

 #include <linux/device.h>
+#include <linux/module.h>
 #include <linux/regmap.h>
 
 #include "bmp280.h"
@@ -37,6 +38,7 @@ const struct regmap_config bmp180_regmap_config = {
 	.writeable_reg = bmp180_is_writeable_reg,
 	.volatile_reg = bmp180_is_volatile_reg,
 };
+EXPORT_SYMBOL(bmp180_regmap_config);
 
 static bool bmp280_is_writeable_reg(struct device *dev, unsigned int reg)
 {
@@ -79,3 +81,4 @@ const struct regmap_config bmp280_regmap_config = {
 	.writeable_reg = bmp280_is_writeable_reg,
 	.volatile_reg = bmp280_is_volatile_reg,
 };
+EXPORT_SYMBOL(bmp280_regmap_config);