1 files changed, 48 insertions, 2 deletions

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 4970c2e96fbf..e75bb584e80b 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -67,6 +67,50 @@ struct mtd_ecc_stats {
         unsigned long failed;
 };
 
+/*
+ * oob operation modes
+ *
+ * MTD_OOB_PLACE:       oob data are placed at the given offset
+ * MTD_OOB_AUTO:        oob data are automatically placed at the free areas
+ *                      which are defined by the ecclayout
+ * MTD_OOB_RAW:         mode to read raw data+oob in one chunk. The oob data
+ *                      is inserted into the data. Thats a raw image of the
+ *                      flash contents.
+ */
+typedef enum {
+        MTD_OOB_PLACE,
+        MTD_OOB_AUTO,
+        MTD_OOB_RAW,
+} mtd_oob_mode_t;
+
+/**
+ * struct mtd_oob_ops - oob operation operands
+ * @mode:       operation mode
+ *
+ * @len:        number of bytes to write/read. When a data buffer is given
+ *              (datbuf != NULL) this is the number of data bytes. When
+ +              no data buffer is available this is the number of oob bytes.
+ *
+ * @retlen:     number of bytes written/read. When a data buffer is given
+ *              (datbuf != NULL) this is the number of data bytes. When
+ +              no data buffer is available this is the number of oob bytes.
+ *
+ * @ooblen:     number of oob bytes per page
+ * @ooboffs:    offset of oob data in the oob area (only relevant when
+ *              mode = MTD_OOB_PLACE)
+ * @datbuf:     data buffer - if NULL only oob data are read/written
+ * @oobbuf:     oob data buffer
+ */
+struct mtd_oob_ops {
+        mtd_oob_mode_t  mode;
+        size_t          len;
+        size_t          retlen;
+        size_t          ooblen;
+        uint32_t        ooboffs;
+        uint8_t         *datbuf;
+        uint8_t         *oobbuf;
+};
+
 struct mtd_info {
         u_char type;
         u_int32_t flags;
@@ -125,8 +169,10 @@ struct mtd_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);
 
-        int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
-        int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
+        int (*read_oob) (struct mtd_info *mtd, loff_t from,
+                         struct mtd_oob_ops *ops);
+        int (*write_oob) (struct mtd_info *mtd, loff_t to,
+                         struct mtd_oob_ops *ops);
 
         /*
          * Methods to access the protection register area, present in some