iio: buffer: Expose data available
Add a sysfs attribute that exposes buffer data available to userspace.
This attribute can be checked at runtime to determine the overall buffer
fill level (across all allocated buffers).
Signed-off-by: Matt Fornero <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index a478740..9cc0ea1 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1413,6 +1413,16 @@
the available samples after the timeout expires and thus have a
maximum delay guarantee.
+What: /sys/bus/iio/devices/iio:deviceX/buffer/data_available
+KernelVersion: 4.16
+Contact: [email protected]
+Description:
+ A read-only value indicating the bytes of data available in the
+ buffer. In the case of an output buffer, this indicates the
+ amount of empty space available to write data to. In the case of
+ an input buffer, this indicates the amount of data available for
+ reading.
+
What: /sys/bus/iio/devices/iio:deviceX/buffer/hwfifo_enabled
KernelVersion: 4.2
Contact: [email protected]
