linux-kernel - [PATCH v4 2/5] iio: mpl3115: add separate function for triggered buffer data collection

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Message-Id: <20251002200206.59824-3-apokusinski01@gmail.com>
Date: Thu,  2 Oct 2025 22:02:03 +0200
From: Antoni Pokusinski <apokusinski01@...il.com>
To: jic23@...nel.org,
	dlechner@...libre.com,
	nuno.sa@...log.com,
	andy@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux@...ck-us.net,
	rodrigo.gobbi.7@...il.com,
	naresh.solanki@...ements.com,
	michal.simek@....com,
	grantpeltier93@...il.com,
	farouk.bouabid@...rry.de,
	marcelo.schmitt1@...il.com,
	Antoni Pokusinski <apokusinski01@...il.com>
Subject: [PATCH v4 2/5] iio: mpl3115: add separate function for triggered buffer data collection

Factor out the code responsible for collecting data for the triggered
buffer from the trigger handler into a separate function.

Signed-off-by: Antoni Pokusinski <apokusinski01@...il.com>
---
 drivers/iio/pressure/mpl3115.c | 54 +++++++++++++++++++---------------
 1 file changed, 30 insertions(+), 24 deletions(-)

diff --git a/drivers/iio/pressure/mpl3115.c b/drivers/iio/pressure/mpl3115.c
index 579da60ef441..1da78081ca7e 100644
--- a/drivers/iio/pressure/mpl3115.c
+++ b/drivers/iio/pressure/mpl3115.c
@@ -148,47 +148,53 @@ static int mpl3115_read_raw(struct iio_dev *indio_dev,
 	return -EINVAL;
 }
 
-static irqreturn_t mpl3115_trigger_handler(int irq, void *p)
+static int mpl3115_fill_trig_buffer(struct iio_dev *indio_dev, u8 *buffer)
 {
-	struct iio_poll_func *pf = p;
-	struct iio_dev *indio_dev = pf->indio_dev;
 	struct mpl3115_data *data = iio_priv(indio_dev);
-	/*
-	 * 32-bit channel + 16-bit channel + padding + ts
-	 * Note that it is possible for only one of the first 2
-	 * channels to be enabled. If that happens, the first element
-	 * of the buffer may be either 16 or 32-bits.  As such we cannot
-	 * use a simple structure definition to express this data layout.
-	 */
-	u8 buffer[16] __aligned(8) = { };
 	int ret, pos = 0;
 
-	mutex_lock(&data->lock);
 	ret = mpl3115_request(data);
-	if (ret < 0) {
-		mutex_unlock(&data->lock);
-		goto done;
-	}
+	if (ret < 0)
+		return ret;
 
 	if (test_bit(0, indio_dev->active_scan_mask)) {
 		ret = i2c_smbus_read_i2c_block_data(data->client,
 			MPL3115_OUT_PRESS, 3, &buffer[pos]);
-		if (ret < 0) {
-			mutex_unlock(&data->lock);
-			goto done;
-		}
+		if (ret < 0)
+			return ret;
 		pos += 4;
 	}
 
 	if (test_bit(1, indio_dev->active_scan_mask)) {
 		ret = i2c_smbus_read_i2c_block_data(data->client,
 			MPL3115_OUT_TEMP, 2, &buffer[pos]);
-		if (ret < 0) {
-			mutex_unlock(&data->lock);
-			goto done;
-		}
+		if (ret < 0)
+			return ret;
 	}
+
+	return 0;
+}
+
+static irqreturn_t mpl3115_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct mpl3115_data *data = iio_priv(indio_dev);
+	/*
+	 * 32-bit channel + 16-bit channel + padding + ts
+	 * Note that it is possible for only one of the first 2
+	 * channels to be enabled. If that happens, the first element
+	 * of the buffer may be either 16 or 32-bits.  As such we cannot
+	 * use a simple structure definition to express this data layout.
+	 */
+	u8 buffer[16] __aligned(8) = { };
+	int ret;
+
+	mutex_lock(&data->lock);
+	ret = mpl3115_fill_trig_buffer(indio_dev, buffer);
 	mutex_unlock(&data->lock);
+	if (ret)
+		goto done;
 
 	iio_push_to_buffers_with_ts(indio_dev, buffer, sizeof(buffer),
 				    iio_get_time_ns(indio_dev));
-- 
2.25.1