iio: Move buffer registration to the core

Originally device and buffer registration were kept as separate operations
in IIO to allow to register two distinct sets of channels for buffered and
non-buffered operations. This has since already been further restricted and
the channel set registered for the buffer needs to be a subset of the
channel set registered for the device. Additionally the possibility to not
have a raw (or processed) attribute for a channel which was registered for
the device was added a while ago. This means it is possible to not register
any device level attributes for a channel even if it is registered for the
device. Also if a channel's scan_index is set to -1 and the channel is
registered for the buffer it is ignored.

So in summary it means it is possible to register the same channel array for
both the device and the buffer yet still end up with distinctive sets of
channels for both of them. This makes the argument for having to have to
manually register the channels for both the device and the buffer invalid.
Considering that the vast majority of all drivers want to register the same
set of channels for both the buffer and the device it makes sense to move
the buffer registration into the core to avoid some boiler-plate code in the
device driver setup path.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index f667e4e7ea6d..8bb3e64eaf2c 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -385,14 +385,16 @@ static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev,
 
 static const char * const iio_scan_elements_group_name = "scan_elements";
 
-int iio_buffer_register(struct iio_dev *indio_dev,
-			const struct iio_chan_spec *channels,
-			int num_channels)
+int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
 {
 	struct iio_dev_attr *p;
 	struct attribute **attr;
 	struct iio_buffer *buffer = indio_dev->buffer;
 	int ret, i, attrn, attrcount, attrcount_orig = 0;
+	const struct iio_chan_spec *channels;
+
+	if (!buffer)
+		return 0;
 
 	if (buffer->attrs)
 		indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs;
@@ -404,9 +406,10 @@ int iio_buffer_register(struct iio_dev *indio_dev,
 	}
 	attrcount = attrcount_orig;
 	INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
+	channels = indio_dev->channels;
 	if (channels) {
 		/* new magic */
-		for (i = 0; i < num_channels; i++) {
+		for (i = 0; i < indio_dev->num_channels; i++) {
 			if (channels[i].scan_index < 0)
 				continue;
 
@@ -463,15 +466,16 @@ error_cleanup_dynamic:
 
 	return ret;
 }
-EXPORT_SYMBOL(iio_buffer_register);
 
-void iio_buffer_unregister(struct iio_dev *indio_dev)
+void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
 {
+	if (!indio_dev->buffer)
+		return;
+
 	kfree(indio_dev->buffer->scan_mask);
 	kfree(indio_dev->buffer->scan_el_group.attrs);
 	iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list);
 }
-EXPORT_SYMBOL(iio_buffer_unregister);
 
 ssize_t iio_buffer_read_length(struct device *dev,
 			       struct device_attribute *attr,