ALSA: Make snd_sgbuf_get_{ptr|addr}() available for non-SG cases

Passing struct snd_dma_buffer pointer instead, so that they work no
matter whether real SG buffer is used or not.

This is a preliminary work for the HD-audio DSP loader code.

Signed-off-by: Ian Minett <ian_minett@creativelabs.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 27 insertions, 26 deletions

diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 957131366dd9..69e01c4fc32d 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -327,32 +327,6 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne
 }
 
 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
-
-/*
- * compute the max chunk size with continuous pages on sg-buffer
- */
-unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
-                                          unsigned int ofs, unsigned int size)
-{
-        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
-        unsigned int start, end, pg;
-
-        start = ofs >> PAGE_SHIFT;
-        end = (ofs + size - 1) >> PAGE_SHIFT;
-        /* check page continuity */
-        pg = sg->table[start].addr >> PAGE_SHIFT;
-        for (;;) {
-                start++;
-                if (start > end)
-                        break;
-                pg++;
-                if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
-                        return (start << PAGE_SHIFT) - ofs;
-        }
-        /* ok, all on continuous pages */
-        return size;
-}
-EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size);
 #endif /* CONFIG_SND_DMA_SGBUF */
 
 /**
diff --git a/sound/core/sgbuf.c b/sound/core/sgbuf.c
index d0f00356fc11..0a418503ec41 100644
--- a/sound/core/sgbuf.c
+++ b/sound/core/sgbuf.c
@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
+#include <linux/export.h>
 #include <sound/memalloc.h>
 
 
@@ -136,3 +137,29 @@ void *snd_malloc_sgbuf_pages(struct device *device,
         snd_free_sgbuf_pages(dmab); /* free the table */
         return NULL;
 }
+
+/*
+ * compute the max chunk size with continuous pages on sg-buffer
+ */
+unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
+                                      unsigned int ofs, unsigned int size)
+{
+        struct snd_sg_buf *sg = dmab->private_data;
+        unsigned int start, end, pg;
+
+        start = ofs >> PAGE_SHIFT;
+        end = (ofs + size - 1) >> PAGE_SHIFT;
+        /* check page continuity */
+        pg = sg->table[start].addr >> PAGE_SHIFT;
+        for (;;) {
+                start++;
+                if (start > end)
+                        break;
+                pg++;
+                if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
+                        return (start << PAGE_SHIFT) - ofs;
+        }
+        /* ok, all on continuous pages */
+        return size;
+}
+EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);