[PATCH v3 1/3] Staging: iio: adt7316: Use device tree data to assign irq_type

[Shreeya Patel <shreeya.patel23498@gmail.com>]

ADT7316 driver no more uses platform data and hence use device tree
data instead of platform data for assigning irq_type field.
Switch case figures out the type of irq and if it's the default case
then assign the default value to the irq_type i.e.
irq_type = IRQF_TRIGGER_LOW
All this is implemented in a new function called adt7316_setup_irq.

Signed-off-by: Shreeya Patel <shreeya.patel23498@gmail.com>
---
 drivers/staging/iio/addac/adt7316.c | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
index 9c72538baf9e..86b2c3d53588 100644
--- a/drivers/staging/iio/addac/adt7316.c
+++ b/drivers/staging/iio/addac/adt7316.c
@@ -1807,6 +1807,29 @@ static irqreturn_t adt7316_event_handler(int irq, void *private)
 	return IRQ_HANDLED;
 }
 
+static int adt7316_setup_irq(struct device *dev, int irq)
+{
+	int irq_type;
+
+	irq_type = irqd_get_trigger_type(irq_get_irq_data(irq));
+
+	switch (irq_type) {
+	case IRQF_TRIGGER_HIGH:
+	case IRQF_TRIGGER_RISING:
+		break;
+	case IRQF_TRIGGER_LOW:
+	case IRQF_TRIGGER_FALLING:
+		break;
+	default:
+		dev_info(dev, "mode %d unsupported, using IRQF_TRIGGER_LOW\n",
+			 irq_type);
+		irq_type = IRQF_TRIGGER_LOW;
+		break;
+	}
+
+	return irq_type;
+}
+
 /*
  * Show mask of enabled interrupts in Hex.
  */
@@ -2101,8 +2124,7 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
 {
 	struct adt7316_chip_info *chip;
 	struct iio_dev *indio_dev;
-	unsigned short *adt7316_platform_data = dev->platform_data;
-	int irq_type = IRQF_TRIGGER_LOW;
+	int irq_type;
 	int ret = 0;
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
@@ -2146,8 +2168,7 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
 	if (chip->bus.irq > 0) {
-		if (adt7316_platform_data[0])
-			irq_type = adt7316_platform_data[0];
+		irq_type = adt7316_setup_irq(dev, chip->bus.irq);
 
 		ret = devm_request_threaded_irq(dev, chip->bus.irq,
 						NULL,
-- 
2.17.1