[RFC 2/8] iio: bmc150: refactor slope duration and threshold update

[Octavian Purdila <octavian.purdila@intel.com>]

Move the slope duration and threshold update in separate functions
to reduce code duplicate between chip init and motion interrupt setup.

The patch also moves the update from the motion interrupt setup
function to the write event function so that we can later refactor the
interrupt code.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
---
 drivers/iio/accel/bmc150-accel.c | 109 ++++++++++++++++++++++-----------------
 1 file changed, 62 insertions(+), 47 deletions(-)

diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c
index 22c096c..5bfb09d 100644
--- a/drivers/iio/accel/bmc150-accel.c
+++ b/drivers/iio/accel/bmc150-accel.c
@@ -266,6 +266,51 @@ static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
 	return -EINVAL;
 }
 
+static int bmc150_accel_update_slope_threshold(struct bmc150_accel_data *data,
+					       int val)
+{
+	int ret = 0;
+
+	val &= 0xFF;
+
+	ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_6,
+					val);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Error writing reg_int_6\n");
+		return ret;
+	}
+	data->slope_thres = val;
+
+	dev_dbg(&data->client->dev, "%s: %x\n", __func__, val);
+
+	return ret;
+}
+
+static int bmc150_accel_update_slope_duration(struct bmc150_accel_data *data,
+					      int val)
+{
+	int ret;
+
+	val &= BMC150_ACCEL_SLOPE_DUR_MASK;
+
+	ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_INT_5);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Error reading reg_int_5\n");
+		return ret;
+	}
+	ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_5,
+					val | ret);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Error write reg_int_5\n");
+		return ret;
+	}
+	data->slope_dur = val;
+
+	dev_dbg(&data->client->dev, "%s: %x\n", __func__, val);
+
+	return ret;
+}
+
 static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
 {
 	int ret;
@@ -304,32 +349,16 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
 
 	data->range = BMC150_ACCEL_DEF_RANGE_4G;
 
-	/* Set default slope duration */
-	ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_INT_5);
-	if (ret < 0) {
-		dev_err(&data->client->dev, "Error reading reg_int_5\n");
-		return ret;
-	}
-	data->slope_dur |= BMC150_ACCEL_DEF_SLOPE_DURATION;
-	ret = i2c_smbus_write_byte_data(data->client,
-					BMC150_ACCEL_REG_INT_5,
-					data->slope_dur);
-	if (ret < 0) {
-		dev_err(&data->client->dev, "Error writing reg_int_5\n");
+	/* Set default slope duration and thresholds */
+	ret = bmc150_accel_update_slope_duration(data,
+					 BMC150_ACCEL_DEF_SLOPE_DURATION);
+	if (ret < 0)
 		return ret;
-	}
-	dev_dbg(&data->client->dev, "slope_dur %x\n", data->slope_dur);
 
-	/* Set default slope thresholds */
-	ret = i2c_smbus_write_byte_data(data->client,
-					BMC150_ACCEL_REG_INT_6,
-					BMC150_ACCEL_DEF_SLOPE_THRESHOLD);
-	if (ret < 0) {
-		dev_err(&data->client->dev, "Error writing reg_int_6\n");
+	ret = bmc150_accel_update_slope_threshold(data,
+					  BMC150_ACCEL_DEF_SLOPE_THRESHOLD);
+	if (ret < 0)
 		return ret;
-	}
-	data->slope_thres = BMC150_ACCEL_DEF_SLOPE_THRESHOLD;
-	dev_dbg(&data->client->dev, "slope_thres %x\n", data->slope_thres);
 
 	/* Set default as latched interrupts */
 	ret = i2c_smbus_write_byte_data(data->client,
@@ -372,24 +401,6 @@ static int bmc150_accel_setup_any_motion_interrupt(
 	}
 
 	if (status) {
-		/* Set slope duration (no of samples) */
-		ret = i2c_smbus_write_byte_data(data->client,
-						BMC150_ACCEL_REG_INT_5,
-						data->slope_dur);
-		if (ret < 0) {
-			dev_err(&data->client->dev, "Error write reg_int_5\n");
-			return ret;
-		}
-
-		/* Set slope thresholds */
-		ret = i2c_smbus_write_byte_data(data->client,
-						BMC150_ACCEL_REG_INT_6,
-						data->slope_thres);
-		if (ret < 0) {
-			dev_err(&data->client->dev, "Error write reg_int_6\n");
-			return ret;
-		}
-
 		/*
 		 * New data interrupt is always non-latched,
 		 * which will have higher priority, so no need
@@ -726,7 +737,7 @@ static int bmc150_accel_read_event(struct iio_dev *indio_dev,
 		*val = data->slope_thres;
 		break;
 	case IIO_EV_INFO_PERIOD:
-		*val = data->slope_dur & BMC150_ACCEL_SLOPE_DUR_MASK;
+		*val = data->slope_dur;
 		break;
 	default:
 		return -EINVAL;
@@ -743,23 +754,27 @@ static int bmc150_accel_write_event(struct iio_dev *indio_dev,
 				    int val, int val2)
 {
 	struct bmc150_accel_data *data = iio_priv(indio_dev);
+	int ret;
 
 	if (data->ev_enable_state)
 		return -EBUSY;
 
 	switch (info) {
 	case IIO_EV_INFO_VALUE:
-		data->slope_thres = val;
+		mutex_lock(&data->mutex);
+		ret = bmc150_accel_update_slope_threshold(data, val);
+		mutex_unlock(&data->mutex);
 		break;
 	case IIO_EV_INFO_PERIOD:
-		data->slope_dur &= ~BMC150_ACCEL_SLOPE_DUR_MASK;
-		data->slope_dur |= val & BMC150_ACCEL_SLOPE_DUR_MASK;
+		mutex_lock(&data->mutex);
+		ret = bmc150_accel_update_slope_duration(data, val);
+		mutex_unlock(&data->mutex);
 		break;
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
 	}
 
-	return 0;
+	return ret;
 }
 
 static int bmc150_accel_read_event_config(struct iio_dev *indio_dev,
-- 
1.9.1