iio: core: Introduce CHANGE event type
A step detector will generate an interrupt each time N step are detected.
A device that has such pedometer functionality is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf.
Introduce IIO_EV_TYPE_CHANGE event type for events that are generated
when the channel passes a threshold on the absolute change in value.
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 71dc8db..c03a140 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -891,12 +891,24 @@
number or direction is not specified, applies to all channels of
this type.
-What: /sys/.../events/in_steps_instance_en
-KernelVersion: 3.19
+What: /sys/.../events/in_steps_change_en
+KernelVersion: 3.20
Contact: linux-iio@vger.kernel.org
Description:
- Enables or disables step detection. Each time the user takes a step an
- event of this type will be generated.
+ Event generated when channel passes a threshold on the absolute
+ change in value. E.g. for steps: a step change event is
+ generated each time the user takes N steps, where N is set using
+ in_steps_change_value.
+
+What: /sys/.../events/in_steps_change_value
+KernelVersion: 3.20
+Contact: linux-iio@vger.kernel.org
+Description:
+ Specifies the value of change threshold that the
+ device is comparing against for the events enabled by
+ <type>[Y][_name]_roc[_rising|falling|]_en. E.g. for steps:
+ if set to 3, a step change event will be generated every 3
+ steps.
What: /sys/bus/iio/devices/iio:deviceX/trigger/current_trigger
KernelVersion: 2.6.35