staging: iio: tsl2x7x: simplify tsl2x7x_clear_interrupts function

tsl2x7x_clear_interrupts() takes a reg argument but there are only
two callers to this function and both callers pass the same value.
Since this function was introduced, interrupts are now working
properly for this driver, and several unnecessary calls to
tsl2x7x_clear_interrupts() were removed. This patch removes the
tsl2x7x_clear_interrupts() function and replaces the two callers
with the i2c_smbus_write_byte() call instead.

Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/light/tsl2x7x.c

@@ -279,20 +279,6 @@ static const u8 device_channel_config[] = {
 	ALSPRX2
 };
 
-static int tsl2x7x_clear_interrupts(struct tsl2X7X_chip *chip, int reg)
-{
-	int ret;
-
-	ret = i2c_smbus_write_byte(chip->client,
-				   TSL2X7X_CMD_REG | TSL2X7X_CMD_SPL_FN | reg);
-	if (ret < 0)
-		dev_err(&chip->client->dev,
-			"%s: failed to clear interrupt status %x: %d\n",
-			__func__, reg, ret);
-
-	return ret;
-}
-
 static int tsl2x7x_read_status(struct tsl2X7X_chip *chip)
 {
 	int ret;
@@ -722,9 +708,15 @@ static int tsl2x7x_chip_on(struct iio_dev *indio_dev)
 	if (ret < 0)
 		return ret;
 
-	ret = tsl2x7x_clear_interrupts(chip, TSL2X7X_CMD_PROXALS_INT_CLR);
-	if (ret < 0)
+	ret = i2c_smbus_write_byte(chip->client,
+				   TSL2X7X_CMD_REG | TSL2X7X_CMD_SPL_FN |
+				   TSL2X7X_CMD_PROXALS_INT_CLR);
+	if (ret < 0) {
+		dev_err(&chip->client->dev,
+			"%s: failed to clear interrupt status: %d\n",
+			__func__, ret);
 		return ret;
+	}
 
 	chip->tsl2x7x_chip_status = TSL2X7X_CHIP_WORKING;
 
@@ -1349,7 +1341,13 @@ static irqreturn_t tsl2x7x_event_handler(int irq, void *private)
 			       timestamp);
 	}
 
-	tsl2x7x_clear_interrupts(chip, TSL2X7X_CMD_PROXALS_INT_CLR);
+	ret = i2c_smbus_write_byte(chip->client,
+				   TSL2X7X_CMD_REG | TSL2X7X_CMD_SPL_FN |
+				   TSL2X7X_CMD_PROXALS_INT_CLR);
+	if (ret < 0)
+		dev_err(&chip->client->dev,
+			"%s: failed to clear interrupt status: %d\n",
+			__func__, ret);
 
 	return IRQ_HANDLED;
 }