iio: imu: adis16475: Create push single sample API

Create push single sample API reposnsible for pushing a single
sample into the buffer.
This is a preparation patch for FIFO support where more than
one sample has to be pushed in the trigger handler.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Ramona Gradinariu <ramona.bolboaca13@gmail.com>
Link: https://lore.kernel.org/r/20240527142618.275897-5-ramona.bolboaca13@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/adis16475.c

@@ -1207,9 +1207,8 @@ static void adis16475_burst32_check(struct adis16475 *st)
 	}
 }
 
-static irqreturn_t adis16475_trigger_handler(int irq, void *p)
+static int adis16475_push_single_sample(struct iio_poll_func *pf)
 {
-	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct adis16475 *st = iio_priv(indio_dev);
 	struct adis *adis = &st->adis;
@@ -1298,6 +1297,15 @@ static irqreturn_t adis16475_trigger_handler(int irq, void *p)
 	 * array.
 	 */
 	adis16475_burst32_check(st);
+	return ret;
+}
+
+static irqreturn_t adis16475_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+
+	adis16475_push_single_sample(pf);
 	iio_trigger_notify_done(indio_dev->trig);
 
 	return IRQ_HANDLED;