iio: pressure: bmp280: split driver in logical parts
This splits the BMP280 driver in three logical parts: the core driver
bmp280-core that only operated on a struct device * and a struct regmap *,
the regmap driver bmp280-regmap that can be shared between I2C and other
transports and the I2C module driver bmp280-i2c.
Cleverly bake all functionality into a single object bmp280.o so that
we still get the same module binary built for the device in the end,
without any fuzz exporting symbols to the left and right.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/pressure/bmp280-regmap.c b/drivers/iio/pressure/bmp280-regmap.c
new file mode 100644
index 0000000..3341189
--- /dev/null
+++ b/drivers/iio/pressure/bmp280-regmap.c
@@ -0,0 +1,81 @@
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+#include "bmp280.h"
+
+static bool bmp180_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case BMP280_REG_CTRL_MEAS:
+ case BMP280_REG_RESET:
+ return true;
+ default:
+ return false;
+ };
+}
+
+static bool bmp180_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case BMP180_REG_OUT_XLSB:
+ case BMP180_REG_OUT_LSB:
+ case BMP180_REG_OUT_MSB:
+ case BMP280_REG_CTRL_MEAS:
+ return true;
+ default:
+ return false;
+ }
+}
+
+const struct regmap_config bmp180_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = BMP180_REG_OUT_XLSB,
+ .cache_type = REGCACHE_RBTREE,
+
+ .writeable_reg = bmp180_is_writeable_reg,
+ .volatile_reg = bmp180_is_volatile_reg,
+};
+
+static bool bmp280_is_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case BMP280_REG_CONFIG:
+ case BMP280_REG_CTRL_HUMIDITY:
+ case BMP280_REG_CTRL_MEAS:
+ case BMP280_REG_RESET:
+ return true;
+ default:
+ return false;
+ };
+}
+
+static bool bmp280_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case BMP280_REG_HUMIDITY_LSB:
+ case BMP280_REG_HUMIDITY_MSB:
+ case BMP280_REG_TEMP_XLSB:
+ case BMP280_REG_TEMP_LSB:
+ case BMP280_REG_TEMP_MSB:
+ case BMP280_REG_PRESS_XLSB:
+ case BMP280_REG_PRESS_LSB:
+ case BMP280_REG_PRESS_MSB:
+ case BMP280_REG_STATUS:
+ return true;
+ default:
+ return false;
+ }
+}
+
+const struct regmap_config bmp280_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = BMP280_REG_HUMIDITY_LSB,
+ .cache_type = REGCACHE_RBTREE,
+
+ .writeable_reg = bmp280_is_writeable_reg,
+ .volatile_reg = bmp280_is_volatile_reg,
+};