[PATCH v3 1/6] iio: accel: adxl345: Pass function pointer to core

[Lothar Rubusch <l.rubusch@xxxxxxxxx>]

Add a function pointer argument to the probe function in
the core module to provide a way to pre-configure the bus.

The passed setup function can be prepared in the bus
specific spi or the i2c module, or NULL otherwise. It shall
then be executed in the bus independent core module.

Signed-off-by: Lothar Rubusch <l.rubusch@xxxxxxxxx>
---
 drivers/iio/accel/adxl345.h      |  3 ++-
 drivers/iio/accel/adxl345_core.c | 10 +++++++++-
 drivers/iio/accel/adxl345_i2c.c  |  2 +-
 drivers/iio/accel/adxl345_spi.c  |  2 +-
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/accel/adxl345.h b/drivers/iio/accel/adxl345.h
index 284bd387c..3c1ded0c2 100644
--- a/drivers/iio/accel/adxl345.h
+++ b/drivers/iio/accel/adxl345.h
@@ -28,6 +28,7 @@ struct adxl345_chip_info {
 	int uscale;
 };
 
-int adxl345_core_probe(struct device *dev, struct regmap *regmap);
+int adxl345_core_probe(struct device *dev, struct regmap *regmap,
+		       int (*setup)(struct device*, struct regmap*));
 
 #endif /* _ADXL345_H_ */
diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index 8bd30a23e..ae12836b5 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -197,13 +197,21 @@ static void adxl345_powerdown(void *regmap)
 	regmap_write(regmap, ADXL345_REG_POWER_CTL, ADXL345_POWER_CTL_STANDBY);
 }
 
-int adxl345_core_probe(struct device *dev, struct regmap *regmap)
+int adxl345_core_probe(struct device *dev, struct regmap *regmap,
+	int (*setup)(struct device*, struct regmap*))
 {
 	struct adxl345_data *data;
 	struct iio_dev *indio_dev;
 	u32 regval;
 	int ret;
 
+	/* Perform optional initial bus specific configuration */
+	if (setup) {
+		ret = setup(dev, regmap);
+		if (ret)
+			return ret;
+	}
+
 	ret = regmap_read(regmap, ADXL345_REG_DEVID, &regval);
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "Error reading device ID\n");
diff --git a/drivers/iio/accel/adxl345_i2c.c b/drivers/iio/accel/adxl345_i2c.c
index a3084b0a8..4065b8f7c 100644
--- a/drivers/iio/accel/adxl345_i2c.c
+++ b/drivers/iio/accel/adxl345_i2c.c
@@ -27,7 +27,7 @@ static int adxl345_i2c_probe(struct i2c_client *client)
 	if (IS_ERR(regmap))
 		return dev_err_probe(&client->dev, PTR_ERR(regmap), "Error initializing regmap\n");
 
-	return adxl345_core_probe(&client->dev, regmap);
+	return adxl345_core_probe(&client->dev, regmap, NULL);
 }
 
 static const struct adxl345_chip_info adxl345_i2c_info = {
diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
index 93ca349f1..1c0513bd3 100644
--- a/drivers/iio/accel/adxl345_spi.c
+++ b/drivers/iio/accel/adxl345_spi.c
@@ -33,7 +33,7 @@ static int adxl345_spi_probe(struct spi_device *spi)
 	if (IS_ERR(regmap))
 		return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");
 
-	return adxl345_core_probe(&spi->dev, regmap);
+	return adxl345_core_probe(&spi->dev, regmap, NULL);
 }
 
 static const struct adxl345_chip_info adxl345_spi_info = {
-- 
2.25.1