[PATCH v2 3/4] iio: adc: ad7768-1: disable IRQ autoenable

[Jonathan Santos]

The device continuously converts data while powered up, generating
interrupts in the background. Configure the IRQ to be enabled and
disabled manually as needed to avoid unnecessary CPU load.

Signed-off-by: Jonathan Santos <Jonathan.Santos@xxxxxxxxxx>
---
Changes in v2:
* New patch. It solves the excessive CPU load issue and addresses
  David's suggestion of having the interrupt disabled when using
  offload.
* This is a reproduction of and old patch sent last year. please refer 
  to the thread [1].

[1]: https://lore.kernel.org/linux-iio/20250718013307.153281-1-Jonathan.Santos@xxxxxxxxxx/T/#t/
---
 drivers/iio/adc/ad7768-1.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
index a927ae288fbb..b77523393a18 100644
--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -464,9 +464,11 @@ static int ad7768_scan_direct(struct iio_dev *indio_dev)
 	int readval, ret;
 
 	reinit_completion(&st->completion);
+	enable_irq(st->spi->irq);
 
 	ret = wait_for_completion_timeout(&st->completion,
 					  msecs_to_jiffies(1000));
+	disable_irq(st->spi->irq);
 	if (!ret)
 		return -ETIMEDOUT;
 
@@ -1339,8 +1341,22 @@ static const struct iio_buffer_setup_ops ad7768_buffer_ops = {
 	.predisable = &ad7768_buffer_predisable,
 };
 
+static int ad7768_set_trigger_state(struct iio_trigger *trig, bool enable)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	if (enable)
+		enable_irq(st->spi->irq);
+	else
+		disable_irq(st->spi->irq);
+
+	return 0;
+}
+
 static const struct iio_trigger_ops ad7768_trigger_ops = {
 	.validate_device = iio_trigger_validate_own_device,
+	.set_trigger_state = ad7768_set_trigger_state,
 };
 
 static int ad7768_set_channel_label(struct iio_dev *indio_dev,
@@ -1704,7 +1720,7 @@ static int ad7768_probe(struct spi_device *spi)
 		return ret;
 
 	ret = devm_request_irq(&spi->dev, spi->irq, &ad7768_interrupt,
-			       IRQF_TRIGGER_RISING | IRQF_NO_THREAD,
+			       IRQF_TRIGGER_RISING | IRQF_NO_THREAD | IRQF_NO_AUTOEN,
 			       indio_dev->name, indio_dev);
 	if (ret)
 		return ret;
-- 
2.34.1