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Subject[PATCH 2/2] iio: chemical: sgpxx: triggered buffer support
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Date
Support triggered buffer for use with e.g. hrtimer for automated
polling to ensure that the sensor's internal baseline is correctly
updated independently of the use-case.

Triggered buffer support is only enabled when IIO_BUFFER is set.

Signed-off-by: Andreas Brauchli <andreas.brauchli@sensirion.com>
---
drivers/iio/chemical/Kconfig | 3 +++
drivers/iio/chemical/sgpxx.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)

diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig
index 4574dd687513..6710fbfc6451 100644
--- a/drivers/iio/chemical/Kconfig
+++ b/drivers/iio/chemical/Kconfig
@@ -42,12 +42,15 @@ config SENSIRION_SGPXX
tristate "Sensirion SGPxx gas sensors"
depends on I2C
select CRC8
+ select IIO_TRIGGERED_BUFFER if (IIO_BUFFER)
help
Say Y here to build I2C interface support for the following
Sensirion SGP gas sensors:
* SGP30 gas sensor
* SGPC3 gas sensor

+ Also select IIO_BUFFER to enable triggered buffers.
+
To compile this driver as module, choose M here: the
module will be called sgpxx.

diff --git a/drivers/iio/chemical/sgpxx.c b/drivers/iio/chemical/sgpxx.c
index aea55e41d4cc..025206448f73 100644
--- a/drivers/iio/chemical/sgpxx.c
+++ b/drivers/iio/chemical/sgpxx.c
@@ -27,6 +27,10 @@
#include <linux/of_device.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
+#ifdef CONFIG_IIO_BUFFER
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#endif /* CONFIG_IIO_BUFFER */
#include <linux/iio/sysfs.h>

#define SGP_WORD_LEN 2
@@ -789,6 +793,26 @@ static const struct of_device_id sgp_dt_ids[] = {
{ }
};

+#ifdef CONFIG_IIO_BUFFER
+static irqreturn_t sgp_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct sgp_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = sgp_get_measurement(data, data->measure_iaq_cmd,
+ SGP_MEASURE_MODE_IAQ);
+ if (!ret)
+ iio_push_to_buffers_with_timestamp(indio_dev,
+ &data->buffer.start,
+ pf->timestamp);
+
+ iio_trigger_notify_done(indio_dev->trig);
+ return IRQ_HANDLED;
+}
+#endif /* CONFIG_IIO_BUFFER */
+
static int sgp_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -846,6 +870,17 @@ static int sgp_probe(struct i2c_client *client,
indio_dev->channels = chip->channels;
indio_dev->num_channels = chip->num_channels;

+#ifdef CONFIG_IIO_BUFFER
+ ret = iio_triggered_buffer_setup(indio_dev,
+ iio_pollfunc_store_time,
+ sgp_trigger_handler,
+ NULL);
+ if (ret) {
+ dev_err(&client->dev, "failed to setup iio triggered buffer\n");
+ goto fail_free;
+ }
+#endif /* CONFIG_IIO_BUFFER */
+
ret = devm_iio_device_register(&client->dev, indio_dev);
if (!ret)
return ret;
@@ -863,6 +898,9 @@ static int sgp_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);

+#ifdef CONFIG_IIO_BUFFER
+ iio_triggered_buffer_cleanup(indio_dev);
+#endif /* CONFIG_IIO_BUFFER */
devm_iio_device_unregister(&client->dev, indio_dev);
return 0;
}
--
2.14.1
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