From f5b81ddd12da71bd00b2963203c23ff929e0c182 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Mon, 18 Jun 2012 18:33:47 +0200
Subject: [PATCH] iio: iio_buffer_register: Skip channels with negative scan
index
It is not always the case that all channels can be used in buffered mode. This
patch allows channels, which can not be used in buffered mode, to set their scan
index to a negative number, which will cause iio_buffer_register to ignore the
channel.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iio/industrialio-buffer.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 2f35db93cdb6e..3d8d187eef2ac 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -285,6 +285,9 @@ int iio_buffer_register(struct iio_dev *indio_dev,
if (channels) {
/* new magic */
for (i = 0; i < num_channels; i++) {
+ if (channels[i].scan_index < 0)
+ continue;
+
/* Establish necessary mask length */
if (channels[i].scan_index >
(int)indio_dev->masklength - 1)
--
2.30.2