iio: st_magn: Add irq trigger handling

Add irq trigger handling for magnetometer also

Signed-off-by: Giuseppe Barba <giuseppe.barba@st.com>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/magnetometer/st_magn.h

@@ -25,6 +25,8 @@ void st_magn_common_remove(struct iio_dev *indio_dev);
 #ifdef CONFIG_IIO_BUFFER
 int st_magn_allocate_ring(struct iio_dev *indio_dev);
 void st_magn_deallocate_ring(struct iio_dev *indio_dev);
+int st_magn_trig_set_state(struct iio_trigger *trig, bool state);
+#define ST_MAGN_TRIGGER_SET_STATE (&st_magn_trig_set_state)
 #else /* CONFIG_IIO_BUFFER */
 static inline int st_magn_probe_trigger(struct iio_dev *indio_dev, int irq)
 {

drivers/iio/magnetometer/st_magn_buffer.c

@@ -23,6 +23,13 @@
 #include <linux/iio/common/st_sensors.h>
 #include "st_magn.h"
 
+int st_magn_trig_set_state(struct iio_trigger *trig, bool state)
+{
+	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+
+	return st_sensors_set_dataready_irq(indio_dev, state);
+}
+
 static int st_magn_buffer_preenable(struct iio_dev *indio_dev)
 {
 	return st_sensors_set_enable(indio_dev, true);

drivers/iio/magnetometer/st_magn_core.c

@@ -480,6 +480,16 @@ static const struct iio_info magn_info = {
 	.write_raw = &st_magn_write_raw,
 };
 
+#ifdef CONFIG_IIO_TRIGGER
+static const struct iio_trigger_ops st_magn_trigger_ops = {
+	.owner = THIS_MODULE,
+	.set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
+};
+#define ST_MAGN_TRIGGER_OPS (&st_magn_trigger_ops)
+#else
+#define ST_MAGN_TRIGGER_OPS NULL
+#endif
+
 int st_magn_common_probe(struct iio_dev *indio_dev)
 {
 	struct st_sensor_data *mdata = iio_priv(indio_dev);
@@ -516,7 +526,8 @@ int st_magn_common_probe(struct iio_dev *indio_dev)
 		return err;
 
 	if (irq > 0) {
-		err = st_sensors_allocate_trigger(indio_dev, NULL);
+		err = st_sensors_allocate_trigger(indio_dev,
+						ST_MAGN_TRIGGER_OPS);
 		if (err < 0)
 			goto st_magn_probe_trigger_error;
 	}