ALSA: Clean up SG-buffer helper functions and macros

Clean up SG-buffer helper functions and macros.  Helpers take substream
as arguments now.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
index ae2921d9ddcc..96d0dc171459 100644
--- a/include/sound/memalloc.h
+++ b/include/sound/memalloc.h
@@ -65,6 +65,11 @@ struct snd_dma_buffer {
 /*
  * Scatter-Gather generic device pages
  */
+void *snd_malloc_sgbuf_pages(struct device *device,
+                             size_t size, struct snd_dma_buffer *dmab,
+                             size_t *res_size);
+int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
+
 struct snd_sg_page {
         void *buf;
         dma_addr_t addr;
@@ -95,6 +100,13 @@ static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t off
         return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE;
 }
 
+/*
+ * return the virtual address at the corresponding offset
+ */
+static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
+{
+        return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
+}
 
 /* allocate/release a buffer */
 int snd_dma_alloc_pages(int type, struct device *dev, size_t size,