iio: bmc150: refactor slope duration and threshold update

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

Also move the slope update code from the interrupt setup function to
the trigger set state function so that we can later refactor the
interrupt code.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/accel/bmc150-accel.c

@@ -269,6 +269,37 @@ static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
 	return -EINVAL;
 }
 
+static int bmc150_accel_update_slope(struct bmc150_accel_data *data)
+{
+	int ret, val;
+
+	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 writing reg_int_6\n");
+		return ret;
+	}
+
+	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;
+	}
+
+	val = (ret & ~BMC150_ACCEL_SLOPE_DUR_MASK) | data->slope_dur;
+	ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_5,
+					val);
+	if (ret < 0) {
+		dev_err(&data->client->dev, "Error write reg_int_5\n");
+		return ret;
+	}
+
+	dev_dbg(&data->client->dev, "%s: %x %x\n", __func__, data->slope_thres,
+		data->slope_dur);
+
+	return ret;
+}
+
 static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
 {
 	int ret;
@@ -307,32 +338,12 @@ 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");
-		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");
-		return ret;
-	}
+	/* Set default slope duration and thresholds */
 	data->slope_thres = BMC150_ACCEL_DEF_SLOPE_THRESHOLD;
-	dev_dbg(&data->client->dev, "slope_thres %x\n", data->slope_thres);
+	data->slope_dur = BMC150_ACCEL_DEF_SLOPE_DURATION;
+	ret = bmc150_accel_update_slope(data);
+	if (ret < 0)
+		return ret;
 
 	/* Set default as latched interrupts */
 	ret = i2c_smbus_write_byte_data(data->client,
@@ -375,24 +386,6 @@ 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
@@ -732,7 +725,7 @@ 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;
@@ -755,11 +748,10 @@ static int bmc150_accel_write_event(struct iio_dev *indio_dev,
 
 	switch (info) {
 	case IIO_EV_INFO_VALUE:
-		data->slope_thres = val;
+		data->slope_thres = val & 0xFF;
 		break;
 	case IIO_EV_INFO_PERIOD:
-		data->slope_dur &= ~BMC150_ACCEL_SLOPE_DUR_MASK;
-		data->slope_dur |= val & BMC150_ACCEL_SLOPE_DUR_MASK;
+		data->slope_dur = val & BMC150_ACCEL_SLOPE_DUR_MASK;
 		break;
 	default:
 		return -EINVAL;
@@ -1056,10 +1048,15 @@ static int bmc150_accel_data_rdy_trigger_set_state(struct iio_trigger *trig,
 		mutex_unlock(&data->mutex);
 		return ret;
 	}
-	if (data->motion_trig == trig)
-		ret =  bmc150_accel_setup_any_motion_interrupt(data, state);
-	else
+
+	if (data->motion_trig == trig) {
+		ret = bmc150_accel_update_slope(data);
+		if (!ret)
+			ret = bmc150_accel_setup_any_motion_interrupt(data,
+								      state);
+	} else {
 		ret = bmc150_accel_setup_new_data_interrupt(data, state);
+	}
 	if (ret < 0) {
 		bmc150_accel_set_power_state(data, false);
 		mutex_unlock(&data->mutex);