[PATCH 3/4] iio: pressure: mpl3115: generalize interrupt pin routing

[SeungJu Cheon <suunj1331@gmail.com>]

Write CTRL_REG5 explicitly for both INT1 and INT2 rather than
relying on power-on defaults when INT2 is selected.

This avoids incorrect interrupt routing after a suspend/resume
cycle where the register may not return to its default state.

Route both DRDY and FIFO interrupts to the selected pin. The
FIFO routing is not yet used but is required by the hardware
FIFO support added in the following patch.

Consolidate polarity configuration into a single code path
that handles both interrupt pins uniformly.

No functional change intended.

Signed-off-by: SeungJu Cheon <suunj1331@gmail.com>
---
 drivers/iio/pressure/mpl3115.c | 33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/pressure/mpl3115.c b/drivers/iio/pressure/mpl3115.c
index 52a3d0d59769..90e83e34ec43 100644
--- a/drivers/iio/pressure/mpl3115.c
+++ b/drivers/iio/pressure/mpl3115.c
@@ -67,6 +67,7 @@
 #define MPL3115_CTRL4_INT_EN_TTH BIT(2)
 
 #define MPL3115_CTRL5_INT_CFG_DRDY BIT(7)
+#define MPL3115_CTRL5_INT_CFG_FIFO BIT(6)
 
 static const unsigned int mpl3115_samp_freq_table[][2] = {
 	{ 1,      0 },
@@ -624,6 +625,7 @@ static int mpl3115_trigger_probe(struct mpl3115_data *data,
 {
 	struct fwnode_handle *fwnode = dev_fwnode(&data->client->dev);
 	int ret, irq, irq_type, irq_pin = MPL3115_IRQ_INT1;
+	u8 ctrl_reg5;
 
 	irq = fwnode_irq_get_byname(fwnode, "INT1");
 	if (irq < 0) {
@@ -634,6 +636,9 @@ static int mpl3115_trigger_probe(struct mpl3115_data *data,
 		irq_pin = MPL3115_IRQ_INT2;
 	}
 
+	ctrl_reg5 = irq_pin == MPL3115_IRQ_INT1 ?
+	    MPL3115_CTRL5_INT_CFG_DRDY | MPL3115_CTRL5_INT_CFG_FIFO : 0;
+
 	irq_type = irq_get_trigger_type(irq);
 	if (irq_type != IRQF_TRIGGER_RISING && irq_type != IRQF_TRIGGER_FALLING)
 		return -EINVAL;
@@ -643,23 +648,19 @@ static int mpl3115_trigger_probe(struct mpl3115_data *data,
 	if (ret < 0)
 		return ret;
 
-	if (irq_pin == MPL3115_IRQ_INT1) {
-		ret = i2c_smbus_write_byte_data(data->client,
-						MPL3115_CTRL_REG5,
-						MPL3115_CTRL5_INT_CFG_DRDY);
-		if (ret)
-			return ret;
+	ret = i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG5,
+					ctrl_reg5);
+	if (ret)
+		return ret;
 
-		if (irq_type == IRQF_TRIGGER_RISING) {
-			ret = i2c_smbus_write_byte_data(data->client,
-							MPL3115_CTRL_REG3,
-							MPL3115_CTRL3_IPOL1);
-			if (ret)
-				return ret;
-		}
-	} else if (irq_type == IRQF_TRIGGER_RISING) {
-		ret = i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG3,
-						MPL3115_CTRL3_IPOL2);
+	if (irq_type == IRQF_TRIGGER_RISING) {
+		u8 ipol = irq_pin == MPL3115_IRQ_INT1 ?
+			  MPL3115_CTRL3_IPOL1 :
+			  MPL3115_CTRL3_IPOL2;
+
+		ret = i2c_smbus_write_byte_data(data->client,
+						MPL3115_CTRL_REG3,
+						ipol);
 		if (ret)
 			return ret;
 	}
-- 
2.52.0