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#include <linux/mutex.h>
14
15struct hd_geometry;
16struct mtd_info;
17struct mtd_blktrans_ops;
18struct file;
19struct inode;
20
21struct mtd_blktrans_dev {
22	struct mtd_blktrans_ops *tr;
23	struct list_head list;
24	struct mtd_info *mtd;
25	struct mutex lock;
26	int devnum;
27	int blksize;
28	unsigned long size;
29	int readonly;
30	void *blkcore_priv; /* gendisk in 2.5, devfs_handle in 2.4 */
31};
32
33struct blkcore_priv; /* Differs for 2.4 and 2.5 kernels; private */
34
35struct mtd_blktrans_ops {
36	char *name;
37	int major;
38	int part_bits;
39
40	/* Access functions */
41	int (*readsect)(struct mtd_blktrans_dev *dev,
42		    unsigned long block, char *buffer);
43	int (*writesect)(struct mtd_blktrans_dev *dev,
44		     unsigned long block, char *buffer);
45
46	/* Block layer ioctls */
47	int (*getgeo)(struct mtd_blktrans_dev *dev, struct hd_geometry *geo);
48	int (*flush)(struct mtd_blktrans_dev *dev);
49
50	/* Called with mtd_table_mutex held; no race with add/remove */
51	int (*open)(struct mtd_blktrans_dev *dev);
52	int (*release)(struct mtd_blktrans_dev *dev);
53
54	/* Called on {de,}registration and on subsequent addition/removal
55	   of devices, with mtd_table_mutex held. */
56	void (*add_mtd)(struct mtd_blktrans_ops *tr, struct mtd_info *mtd);
57	void (*remove_dev)(struct mtd_blktrans_dev *dev);
58
59	struct list_head devs;
60	struct list_head list;
61	struct module *owner;
62
63	struct mtd_blkcore_priv *blkcore_priv;
64};
65
66extern int register_mtd_blktrans(struct mtd_blktrans_ops *tr);
67extern int deregister_mtd_blktrans(struct mtd_blktrans_ops *tr);
68extern int add_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
69extern int del_mtd_blktrans_dev(struct mtd_blktrans_dev *dev);
70
71
72#endif /* __MTD_TRANS_H__ */
73