This is useful for consumers that wish to parse raw buffer data.
Tested-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Signed-off-by: Artur Rojek <contact@xxxxxxxxxxxxxx>
---
drivers/iio/industrialio-buffer.c | 28 ++++++++++++++++++++++++++++
include/linux/iio/buffer.h | 4 ++++
2 files changed, 32 insertions(+)
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 228598b82a2f..cf23736610d9 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -691,6 +691,34 @@ static unsigned int iio_storage_bytes_for_si(struct iio_dev *indio_dev,
return bytes;
}
+int iio_find_channel_offset_in_buffer(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ struct iio_buffer *buffer)
+{
+ int length, offset = 0;
+ unsigned int si;
+
+ if (chan->scan_index < 0 ||
+ !test_bit(chan->scan_index, buffer->scan_mask)) {
+ return -EINVAL;
+ }
+
+ for (si = 0; si < chan->scan_index; ++si) {
+ if (!test_bit(si, buffer->scan_mask))
+ continue;
+
+ length = iio_storage_bytes_for_si(indio_dev, si);
+
+ /* Account for channel alignment. */
+ if (offset % length)
+ offset += length - (offset % length);
+ offset += length;
+ }
+
+ return offset;
+}
+EXPORT_SYMBOL_GPL(iio_find_channel_offset_in_buffer);
+
static unsigned int iio_storage_bytes_for_timestamp(struct iio_dev *indio_dev)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
diff --git a/include/linux/iio/buffer.h b/include/linux/iio/buffer.h
index 418b1307d3f2..b1db74772e77 100644
--- a/include/linux/iio/buffer.h
+++ b/include/linux/iio/buffer.h
@@ -16,6 +16,10 @@ enum iio_buffer_direction {
IIO_BUFFER_DIRECTION_OUT,
};
+int iio_find_channel_offset_in_buffer(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ struct iio_buffer *buffer);
+
int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data);
int iio_pop_from_buffer(struct iio_buffer *buffer, void *data);
--
2.37.2
