staging:iio: add a callback buffer for in kernel push interface

This callback buffer is meant to be opaque to users, but basically
adds a very simple pass through buffer to which data may be
pushed when it is inserted into the buffer list.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index fc937aca71fb..65ae734c607d 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -20,6 +20,12 @@ config IIO_BUFFER
 
 if IIO_BUFFER
 
+config IIO_BUFFER_CB
+boolean "IIO callback buffer used for push in-kernel interfaces"
+        help
+          Should be selected by any drivers that do-inkernel push
+          usage.  That is, those where the data is pushed to the consumer.
+
 config IIO_KFIFO_BUF
         select IIO_TRIGGER
         tristate "Industrial I/O buffering based on kfifo"