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authorDavid Howells <dhowells@redhat.com>2009-02-12 10:40:00 +0000
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-03-24 09:00:19 +0000
commit402d326519c1a4859c527702383f4e60f606ef52 (patch)
treebeb302d56d7671d372ae73f2664feed2a5b1226d /include/linux/mtd
parent9ce969082e490d0a5a81862b364337c93dc3482a (diff)
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NOMMU: Present backing device capabilities for MTD chardevs
Present backing device capabilities for MTD character device files to allow NOMMU mmap to do direct mapping where possible. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Bernd Schmidt <bernd.schmidt@analog.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'include/linux/mtd')
-rw-r--r--include/linux/mtd/mtd.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 3aa5d77c2cd..0c079fd307a 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -162,6 +162,20 @@ struct mtd_info {
/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
+ /* Allow NOMMU mmap() to directly map the device (if not NULL)
+ * - return the address to which the offset maps
+ * - return -ENOSYS to indicate refusal to do the mapping
+ */
+ unsigned long (*get_unmapped_area) (struct mtd_info *mtd,
+ unsigned long len,
+ unsigned long offset,
+ unsigned long flags);
+
+ /* Backing device capabilities for this device
+ * - provides mmap capabilities
+ */
+ struct backing_dev_info *backing_dev_info;
+
int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);