linux-kernel - [PATCH v3 3/4] iio: accel: adxl372: add additional events ABIs

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Date:   Wed, 18 Mar 2020 13:09:57 +0200
From:   Alexandru Tachici <tachicialex@...il.com>
To:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     jic23@...nel.org
Subject: [PATCH v3 3/4] iio: accel: adxl372: add additional events ABIs

Adxl372 uses the standard event interface. The additional
ABIs aim to explain to the user that the values set in
./events/thresh_falling_period and ./events/thresh_rising_period
control the state of the device, not just the events timings.

Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>
---
 drivers/iio/accel/adxl372.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c
index d8f95c9f9587..1122c27fc37e 100644
--- a/drivers/iio/accel/adxl372.c
+++ b/drivers/iio/accel/adxl372.c
@@ -239,6 +239,29 @@ static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = {
 	{ BIT(0) | BIT(1) | BIT(2), ADXL372_XYZ_FIFO },
 };
 
+static ssize_t adxl372_read_detect_event(struct iio_dev *indio_dev, uintptr_t p,
+					 const struct iio_chan_spec *chan,
+					 char *buf)
+{
+	return sprintf(buf, "%s", (const char *)p);
+}
+
+static const struct iio_chan_spec_ext_info adxl372_ext_info[] = {
+	{
+		.name = "activity_detect_event",
+		.shared = IIO_SHARED_BY_ALL,
+		.read = adxl372_read_detect_event,
+		.private = (uintptr_t)"in_accel_thresh_x_rising\n",
+	},
+	{
+		.name = "inactivity_detect_event",
+		.shared = IIO_SHARED_BY_ALL,
+		.read = adxl372_read_detect_event,
+		.private = (uintptr_t)"in_accel_thresh_x_falling\n",
+	},
+	{},
+};
+
 static const struct iio_event_spec adxl372_events[] = {
 	{
 		.type = IIO_EV_TYPE_THRESH,
@@ -272,7 +295,8 @@ static const struct iio_event_spec adxl372_events[] = {
 		.shift = 4,						\
 	},								\
 	.event_spec = adxl372_events,					\
-	.num_event_specs = 2						\
+	.num_event_specs = 2,						\
+	.ext_info = adxl372_ext_info,					\
 }
 
 static const struct iio_chan_spec adxl372_channels[] = {
-- 
2.20.1