iio: Move callback buffer to its own module

Currently the IIO callback buffer implementation is directly built into the
IIO core module when enabled. Given that the callback buffer module is
standalone functionallity there is really no reason to do this. So move it
to its own module.

Also rename the source to follow the standard IIO module naming convention
as well as add a license notice to the file.

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

1 files changed, 0 insertions, 126 deletions

diff --git a/drivers/iio/buffer_cb.c b/drivers/iio/buffer_cb.c
deleted file mode 100644
index 1648e6e5a848..000000000000
--- a/drivers/iio/buffer_cb.c
+++ /dev/null
@@ -1,126 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/err.h>
-#include <linux/export.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/consumer.h>
-
-struct iio_cb_buffer {
-	struct iio_buffer buffer;
-	int (*cb)(const void *data, void *private);
-	void *private;
-	struct iio_channel *channels;
-};
-
-static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
-{
-	return container_of(buffer, struct iio_cb_buffer, buffer);
-}
-
-static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
-{
-	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
-	return cb_buff->cb(data, cb_buff->private);
-}
-
-static void iio_buffer_cb_release(struct iio_buffer *buffer)
-{
-	struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
-	kfree(cb_buff->buffer.scan_mask);
-	kfree(cb_buff);
-}
-
-static const struct iio_buffer_access_funcs iio_cb_access = {
-	.store_to = &iio_buffer_cb_store_to,
-	.release = &iio_buffer_cb_release,
-
-	.modes = INDIO_BUFFER_SOFTWARE | INDIO_BUFFER_TRIGGERED,
-};
-
-struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
-					     int (*cb)(const void *data,
-						       void *private),
-					     void *private)
-{
-	int ret;
-	struct iio_cb_buffer *cb_buff;
-	struct iio_dev *indio_dev;
-	struct iio_channel *chan;
-
-	cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
-	if (cb_buff == NULL)
-		return ERR_PTR(-ENOMEM);
-
-	iio_buffer_init(&cb_buff->buffer);
-
-	cb_buff->private = private;
-	cb_buff->cb = cb;
-	cb_buff->buffer.access = &iio_cb_access;
-	INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
-
-	cb_buff->channels = iio_channel_get_all(dev);
-	if (IS_ERR(cb_buff->channels)) {
-		ret = PTR_ERR(cb_buff->channels);
-		goto error_free_cb_buff;
-	}
-
-	indio_dev = cb_buff->channels[0].indio_dev;
-	cb_buff->buffer.scan_mask
-		= kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
-			  GFP_KERNEL);
-	if (cb_buff->buffer.scan_mask == NULL) {
-		ret = -ENOMEM;
-		goto error_release_channels;
-	}
-	chan = &cb_buff->channels[0];
-	while (chan->indio_dev) {
-		if (chan->indio_dev != indio_dev) {
-			ret = -EINVAL;
-			goto error_free_scan_mask;
-		}
-		set_bit(chan->channel->scan_index,
-			cb_buff->buffer.scan_mask);
-		chan++;
-	}
-
-	return cb_buff;
-
-error_free_scan_mask:
-	kfree(cb_buff->buffer.scan_mask);
-error_release_channels:
-	iio_channel_release_all(cb_buff->channels);
-error_free_cb_buff:
-	kfree(cb_buff);
-	return ERR_PTR(ret);
-}
-EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
-
-int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
-{
-	return iio_update_buffers(cb_buff->channels[0].indio_dev,
-				  &cb_buff->buffer,
-				  NULL);
-}
-EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
-
-void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
-{
-	iio_update_buffers(cb_buff->channels[0].indio_dev,
-			   NULL,
-			   &cb_buff->buffer);
-}
-EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
-
-void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
-{
-	iio_channel_release_all(cb_buff->channels);
-	iio_buffer_put(&cb_buff->buffer);
-}
-EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
-
-struct iio_channel
-*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
-{
-	return cb_buffer->channels;
-}
-EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);