linux-kernel - [PATCH v5 2/5] iio: ABI: document mag

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Date:   Mon, 14 Feb 2022 09:38:07 +0200
From:   Cosmin Tanislav <demonsingur@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     cosmin.tanislav@...log.com, demonsingur@...il.com,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Rob Herring <robh+dt@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 2/5] iio: ABI: document mag_referenced

Some accelerometers that support activity and inactivity
events also support a referenced mode, in which the
gravitational acceleration is taken as a point of
reference before comparing the acceleration to the
specified activity and inactivity magnitude.

For example, in the case of the ADXL367, for activity
detection, the formula is:

abs(acceleration - reference) > magnitude

Add a new event type that makes this behavior clear.

Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
---
 Documentation/ABI/testing/sysfs-bus-iio | 26 +++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index c551301b33f1..41c1e3e1bf30 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1213,6 +1213,32 @@ Description:
 		number or direction is not specified, applies to all channels of
 		this type.
 
+What:		/sys/.../iio:deviceX/events/in_accel_mag_referenced_en
+What:		/sys/.../iio:deviceX/events/in_accel_mag_referenced_rising_en
+What:		/sys/.../iio:deviceX/events/in_accel_mag_referenced_falling_en
+What:		/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_en
+What:		/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_rising_en
+What:		/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_falling_en
+KernelVersion:	5.18
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Similar to in_accel_mag[_y][_rising|_falling]_en, but the event
+		value is relative to a reference magnitude. The reference magnitude
+		includes the graviational acceleration.
+
+What:		/sys/.../iio:deviceX/events/in_accel_mag_referenced_value
+What:		/sys/.../iio:deviceX/events/in_accel_mag_referenced_rising_value
+What:		/sys/.../iio:deviceX/events/in_accel_mag_referenced_falling_value
+What:		/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_value
+What:		/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_rising_value
+What:		/sys/.../iio:deviceX/events/in_accel_y_mag_referenced_falling_value
+KernelVersion:	5.18
+Contact:	linux-iio@...r.kernel.org
+Description:
+		The value to which the reference magnitude of the channel is
+		compared. If the axis is not specified, it applies to all channels
+		of this type.
+
 What:		/sys/.../events/in_steps_change_en
 KernelVersion:	4.0
 Contact:	linux-iio@...r.kernel.org
-- 
2.35.1