2 * $Id: mtdblock_ro.c,v 1.18 2003/06/23 12:00:08 dwmw2 Exp $
4 * (C) 2003 David Woodhouse <dwmw2@infradead.org>
6 * Simple read-only (writable only for RAM) mtdblock driver
9 #include <linux/init.h>
10 #include <linux/slab.h>
11 #include <linux/mtd/mtd.h>
12 #include <linux/mtd/blktrans.h>
14 static int mtdblock_readsect(struct mtd_blktrans_dev
*dev
,
15 unsigned long block
, char *buf
)
19 if (dev
->mtd
->read(dev
->mtd
, (block
* 512), 512, &retlen
, buf
))
24 static int mtdblock_writesect(struct mtd_blktrans_dev
*dev
,
25 unsigned long block
, char *buf
)
29 if (dev
->mtd
->write(dev
->mtd
, (block
* 512), 512, &retlen
, buf
))
34 static void mtdblock_add_mtd(struct mtd_blktrans_ops
*tr
, struct mtd_info
*mtd
)
36 struct mtd_blktrans_dev
*dev
= kmalloc(sizeof(*dev
), GFP_KERNEL
);
41 memset(dev
, 0, sizeof(*dev
));
44 dev
->devnum
= mtd
->index
;
46 dev
->size
= mtd
->size
>> 9;
48 if ((mtd
->flags
& (MTD_CLEAR_BITS
|MTD_SET_BITS
|MTD_WRITEABLE
)) !=
49 (MTD_CLEAR_BITS
|MTD_SET_BITS
|MTD_WRITEABLE
))
52 add_mtd_blktrans_dev(dev
);
55 static void mtdblock_remove_dev(struct mtd_blktrans_dev
*dev
)
57 del_mtd_blktrans_dev(dev
);
61 struct mtd_blktrans_ops mtdblock_tr
= {
65 .readsect
= mtdblock_readsect
,
66 .writesect
= mtdblock_writesect
,
67 .add_mtd
= mtdblock_add_mtd
,
68 .remove_dev
= mtdblock_remove_dev
,
72 static int __init
mtdblock_init(void)
74 return register_mtd_blktrans(&mtdblock_tr
);
77 static void __exit
mtdblock_exit(void)
79 deregister_mtd_blktrans(&mtdblock_tr
);
82 module_init(mtdblock_init
);
83 module_exit(mtdblock_exit
);
85 MODULE_LICENSE("GPL");
86 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
87 MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");