iio: Add AS3935 lightning sensor support

AS3935 chipset can detect lightning strikes and reports those back as
events and the estimated distance to the storm.

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-proximity-as3935 b/Documentation/ABI/testing/sysfs-bus-iio-proximity-as3935
new file mode 100644
index 000000000000..6708c5e264aa
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-proximity-as3935
@@ -0,0 +1,16 @@
+What            /sys/bus/iio/devices/iio:deviceX/in_proximity_raw
+Date:           March 2014
+KernelVersion:  3.15
+Contact:        Matt Ranostay <mranostay@gmail.com>
+Description:
+                Get the current distance in meters of storm (1km steps)
+                1000-40000 = distance in meters
+
+What            /sys/bus/iio/devices/iio:deviceX/sensor_sensitivity
+Date:           March 2014
+KernelVersion:  3.15
+Contact:        Matt Ranostay <mranostay@gmail.com>
+Description:
+                Show or set the gain boost of the amp, from 0-31 range.
+                18 = indoors (default)
+                14 = outdoors