linux-kernel - [PATCH 5/6] iio: pressure: hsc030pa add triggered buffer

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Date: Wed, 10 Jan 2024 19:22:40 +0200
From: Petre Rodan <petre.rodan@...dimension.ro>
To: linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Petre Rodan <petre.rodan@...dimension.ro>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH 5/6] iio: pressure: hsc030pa add triggered buffer

Add triggered buffer feature.

Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>
---
 drivers/iio/pressure/hsc030pa.c | 42 +++++++++++++++++++++++++++++++++
 drivers/iio/pressure/hsc030pa.h |  2 +-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/pressure/hsc030pa.c b/drivers/iio/pressure/hsc030pa.c
index 7e3f74d53b47..3faa0fd42201 100644
--- a/drivers/iio/pressure/hsc030pa.c
+++ b/drivers/iio/pressure/hsc030pa.c
@@ -22,8 +22,11 @@
 #include <linux/types.h>
 #include <linux/units.h>

+#include <linux/iio/buffer.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>

 #include <asm/unaligned.h>

@@ -297,6 +300,23 @@ static int hsc_get_measurement(struct hsc_data *data)
 	return 0;
 }

+static irqreturn_t hsc_trigger_handler(int irq, void *private)
+{
+	struct iio_poll_func *pf = private;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct hsc_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = hsc_get_measurement(data);
+	if (!ret) {
+		iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
+						   iio_get_time_ns(indio_dev));
+	}
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
 /*
  * IIO ABI expects
  * value = (conv + offset) * scale
@@ -382,13 +402,30 @@ static const struct iio_chan_spec hsc_channels[] = {
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OFFSET),
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 14,
+			.storagebits = 16,
+			.shift = 0,
+			.endianness = IIO_BE,
+		},
 	},
 	{
 		.type = IIO_TEMP,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 				      BIT(IIO_CHAN_INFO_SCALE) |
 				      BIT(IIO_CHAN_INFO_OFFSET),
+		.scan_index = 1,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 11,
+			.storagebits = 16,
+			.shift = 5,
+			.endianness = IIO_BE,
+		},
 	},
+	IIO_CHAN_SOFT_TIMESTAMP(2),
 };

 static const struct iio_info hsc_info = {
@@ -485,6 +522,11 @@ int hsc_common_probe(struct device *dev, hsc_recv_fn recv)
 	indio_dev->channels = hsc->chip->channels;
 	indio_dev->num_channels = hsc->chip->num_channels;

+	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
+					      hsc_trigger_handler, NULL);
+	if (ret)
+		return ret;
+
 	return devm_iio_device_register(dev, indio_dev);
 }
 EXPORT_SYMBOL_NS(hsc_common_probe, IIO_HONEYWELL_HSC030PA);
diff --git a/drivers/iio/pressure/hsc030pa.h b/drivers/iio/pressure/hsc030pa.h
index 56dc8e88194b..6c635c42d85d 100644
--- a/drivers/iio/pressure/hsc030pa.h
+++ b/drivers/iio/pressure/hsc030pa.h
@@ -56,7 +56,7 @@ struct hsc_data {
 	s32 p_scale_dec;
 	s64 p_offset;
 	s32 p_offset_dec;
-	u8 buffer[HSC_REG_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
+	u8 buffer[16] __aligned(IIO_DMA_MINALIGN);
 };

 struct hsc_chip_data {
--
2.41.0