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>

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>
Lars-Peter Clausen · Greg Kroah-Hartman
1 parent 493b67b73c
Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff
drivers/iio/industrialio-buffer.c
@@ -285,6 +285,9 @@
 	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)
...	...	@@ -285,6 +285,9 @@
285	285	if (channels) {
286	286	/* new magic */
287	287	for (i = 0; i < num_channels; i++) {
	288	+ if (channels[i].scan_index < 0)
	289	+ continue;
	290	+
288	291	/* Establish necessary mask length */
289	292	if (channels[i].scan_index >
290	293	(int)indio_dev->masklength - 1)