[PATCH 2/2] iio: inv_mpu6050: Make interrupt optional

[Lars-Peter Clausen <lars@metafoo.de>]

The inv_mpu6050 driver requires an interrupt for buffered capture. But non
buffered reading for measurements works just fine without an interrupt
connected.

Make the interrupt optional to support this case.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 51 ++++++++++++++--------
 1 file changed, 32 insertions(+), 19 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 99ee0a218875..cda7b48981c9 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -1458,15 +1458,21 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 		st->plat_data = *pdata;
 	}
 
-	desc = irq_get_irq_data(irq);
-	if (!desc) {
-		dev_err(dev, "Could not find IRQ %d\n", irq);
-		return -EINVAL;
-	}
+	if (irq > 0) {
+		desc = irq_get_irq_data(irq);
+		if (!desc) {
+			dev_err(dev, "Could not find IRQ %d\n", irq);
+			return -EINVAL;
+		}
 
-	irq_type = irqd_get_trigger_type(desc);
-	if (!irq_type)
+		irq_type = irqd_get_trigger_type(desc);
+		if (!irq_type)
+			irq_type = IRQF_TRIGGER_RISING;
+	} else {
+		/* Doesn't really matter, use the default */
 		irq_type = IRQF_TRIGGER_RISING;
+	}
+
 	if (irq_type & IRQF_TRIGGER_RISING)	// rising or both-edge
 		st->irq_mask = INV_MPU6050_ACTIVE_HIGH;
 	else if (irq_type == IRQF_TRIGGER_FALLING)
@@ -1592,18 +1598,25 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 
 	indio_dev->info = &mpu_info;
 
-	result = devm_iio_triggered_buffer_setup(dev, indio_dev,
-						 iio_pollfunc_store_time,
-						 inv_mpu6050_read_fifo,
-						 NULL);
-	if (result) {
-		dev_err(dev, "configure buffer fail %d\n", result);
-		return result;
-	}
-	result = inv_mpu6050_probe_trigger(indio_dev, irq_type);
-	if (result) {
-		dev_err(dev, "trigger probe fail %d\n", result);
-		return result;
+	if (irq > 0) {
+		/*
+		 * The driver currently only supports buffered capture with its
+		 * own trigger. So no IRQ, no trigger, no buffer
+		 */
+		result = devm_iio_triggered_buffer_setup(dev, indio_dev,
+							 iio_pollfunc_store_time,
+							 inv_mpu6050_read_fifo,
+							 NULL);
+		if (result) {
+			dev_err(dev, "configure buffer fail %d\n", result);
+			return result;
+		}
+
+		result = inv_mpu6050_probe_trigger(indio_dev, irq_type);
+		if (result) {
+			dev_err(dev, "trigger probe fail %d\n", result);
+			return result;
+		}
 	}
 
 	result = devm_iio_device_register(dev, indio_dev);
-- 
2.20.1