[v5 07/14] iio: add support for binary attributes

From: Andrea Merello
Date: Tue Apr 26 2022 - 09:11:42 EST

From: Andrea Merello <andrea.merello@xxxxxx>

When a IIO device is registered, the IIO core creates an attribute group on
its own, where it puts the channel attributes, and where it copies the
attributes in indio_dev->info->attrs.

Unfortunately it doesn't take care of binary attributes (i.e. it only
consider indio_dev->info->attrs->attrs, and it ignores

Fix this by making the IIO layer take care also of the binary attributes.

Note that while it is necessary to copy the non-binary attributes because
the IIO layer needs more room to add the channels attribute, it should be
enough to assign the bin_attrs pointer to the binary attributes pointed by

Signed-off-by: Andrea Merello <andrea.merello@xxxxxx>
drivers/iio/industrialio-core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index aa5f98d3b334..aef30f0b9465 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1567,7 +1567,7 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
ret = -ENOMEM;
goto error_clear_attrs;
- /* Copy across original attributes */
+ /* Copy across original attributes, and point to original binary attributes */
if (indio_dev->info->attrs) {
@@ -1575,6 +1575,8 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev)
iio_dev_opaque->chan_attr_group.is_visible =
+ iio_dev_opaque->chan_attr_group.bin_attrs =
+ indio_dev->info->attrs->bin_attrs;
attrn = attrcount_orig;
/* Add all elements from the list. */