1 files changed, 12 insertions, 8 deletions

diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
index a195f3b9c00a..80130100e450 100644
--- a/include/media/videobuf-dma-sg.h
+++ b/include/media/videobuf-dma-sg.h
@@ -87,6 +87,16 @@ struct videobuf_dma_sg_memory {
         struct videobuf_dmabuf  dma;
 };
 
+/*
+ * Scatter-gather DMA buffer API.
+ *
+ * These functions provide a simple way to create a page list and a
+ * scatter-gather list from a kernel, userspace of physical address and map the
+ * memory for DMA operation.
+ *
+ * Despite the name, this is totally unrelated to videobuf, except that
+ * videobuf-dma-sg uses the same API internally.
+ */
 void videobuf_dma_init(struct videobuf_dmabuf *dma);
 int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
                            unsigned long data, unsigned long size);
@@ -96,8 +106,8 @@ int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
                               dma_addr_t addr, int nr_pages);
 int videobuf_dma_free(struct videobuf_dmabuf *dma);
 
-int videobuf_dma_map(struct videobuf_queue *q, struct videobuf_dmabuf *dma);
-int videobuf_dma_unmap(struct videobuf_queue *q, struct videobuf_dmabuf *dma);
+int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma);
+int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma);
 struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf);
 
 void *videobuf_sg_alloc(size_t size);
@@ -111,11 +121,5 @@ void videobuf_queue_sg_init(struct videobuf_queue *q,
                          unsigned int msize,
                          void *priv);
 
-/*FIXME: these variants are used only on *-alsa code, where videobuf is
- * used without queue
- */
-int videobuf_sg_dma_map(struct device *dev, struct videobuf_dmabuf *dma);
-int videobuf_sg_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma);
-
 #endif /* _VIDEOBUF_DMA_SG_H */