include/linux/mtd/blktrans.h

   1 /*
   2  * $Id: blktrans.h,v 1.6 2005/11/07 11:14:54 gleixner Exp $
   3  *
   4  * (C) 2003 David Woodhouse <dwmw2@infradead.org>
   5  *
   6  * Interface to Linux block layer for MTD 'translation layers'.
   7  *
   8  */
   9
  10 #ifndef __MTD_TRANS_H__
  11 #define __MTD_TRANS_H__
  12
  13 /* XXX U-BOOT XXX */
  14 #if 0
  15 #include <linux/mutex.h>
  16 #else
  17 #include <linux/list.h>
  18 #endif
  19
  20 struct hd_geometry;
  21 struct mtd_info;
  22 struct mtd_blktrans_ops;
  23 struct file;
  24 struct inode;
  25
  26 struct mtd_blktrans_dev {
  27         struct mtd_blktrans_ops *tr;
  28         struct list_head list;
  29         struct mtd_info *mtd;
  30 /* XXX U-BOOT XXX */
  31 #if 0
  32         struct mutex lock;
  33 #endif
  34         int devnum;
  35         unsigned long size;
  36         int readonly;
  37         void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
  38 };
  39
  40 struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
  41
  42 struct mtd_blktrans_ops {
  43         char *name;
  44         int major;
  45         int part_bits;
  46         int blksize;
  47         int blkshift;
  48
  49         /* Access functions */
  50         int (*readsect)(struct mtd_blktrans_dev *dev,
  51                     unsigned long block, char *buffer);
  52         int (*writesect)(struct mtd_blktrans_dev *dev,
  53                      unsigned long block, char *buffer);
  54
  55         /* Block layer ioctls */
  56         int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
  57         int (*flush)(struct mtd_blktrans_dev *dev);
  58
  59         /* Called with mtd_table_mutex held; no race with add/remove */
  60         int (*open)(struct mtd_blktrans_dev *dev);
  61         int (*release)(struct mtd_blktrans_dev *dev);
  62
  63         /* Called on {de,}registration and on subsequent addition/removal
  64            of devices, with mtd_table_mutex held. */
  65         void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
  66         void (*remove_dev)(struct mtd_blktrans_dev *dev);
  67
  68         struct list_head devs;
  69         struct list_head list;
  70         struct module *owner;
  71
  72         struct mtd_blkcore_priv *blkcore_priv;
  73 };
  74
  75 extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
  76 extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
  77 extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  78 extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
  79
  80
  81 #endif /* __MTD_TRANS_H__ */