V4L/DVB (6254): Add videobuf-vmalloc
Adds a newer videobuf-vmalloc module. This module uses the same
videobuf controls, but implements memory allocation based on vmalloc
methods.
With this method, an USB driver can use video-buf, without needing to
request memory from the DMA-safe area.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/include/media/videobuf-vmalloc.h b/include/media/videobuf-vmalloc.h
new file mode 100644
index 0000000..5fff68d
--- /dev/null
+++ b/include/media/videobuf-vmalloc.h
@@ -0,0 +1,44 @@
+/*
+ * helper functions for vmalloc capture buffers
+ *
+ * The functions expect the hardware being able to scatter gatter
+ * (i.e. the buffers are not linear in physical memory, but fragmented
+ * into PAGE_SIZE chunks). They also assume the driver does not need
+ * to touch the video data.
+ *
+ * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2
+ */
+
+#include <media/videobuf-core.h>
+
+/* --------------------------------------------------------------------- */
+
+struct videbuf_vmalloc_memory
+{
+ u32 magic;
+
+ /* for mmap'ed buffers */
+ struct videobuf_mapping *map;
+
+ void *vmalloc;
+
+ /* remap_vmalloc_range seems to need to run after mmap() on some cases */
+ struct vm_area_struct *vma;
+};
+
+void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
+ struct videobuf_queue_ops *ops,
+ void *dev,
+ spinlock_t *irqlock,
+ enum v4l2_buf_type type,
+ enum v4l2_field field,
+ unsigned int msize,
+ void *priv);
+
+void *videobuf_to_vmalloc (struct videobuf_buffer *buf);
+
+void videobuf_vmalloc_free (struct videobuf_buffer *buf);