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/*

 * $Id: mtdblock_ro.c,v 1.19 2004/11/16 18:28:59 dwmw2 Exp $

 *

 * (C) 2003 David Woodhouse <dwmw2@infradead.org>

 *

 * Simple read-only (writable only for RAM) mtdblock driver

 */

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/blktrans.h>

static int mtdblock_readsect(struct mtd_blktrans_dev *dev,

                              unsigned long block, char *buf)

{

        size_t retlen;

        if (dev->mtd->read(dev->mtd, (block * 512), 512, &retlen, buf))

                return 1;

        return 0;

}

static int mtdblock_writesect(struct mtd_blktrans_dev *dev,

                              unsigned long block, char *buf)

{

        size_t retlen;

        if (dev->mtd->write(dev->mtd, (block * 512), 512, &retlen, buf))

                return 1;

        return 0;

}

static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)

{

        struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);

        if (!dev)

                return;

        dev->mtd = mtd;

        dev->devnum = mtd->index;

        dev->size = mtd->size >> 9;

        dev->tr = tr;

        dev->readonly = 1;

        add_mtd_blktrans_dev(dev);

}

static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)

{

        del_mtd_blktrans_dev(dev);

        kfree(dev);

}

static struct mtd_blktrans_ops mtdblock_tr = {

        .name           = "mtdblock",

        .major          = 31,

        .part_bits      = 0,

        .blksize        = 512,

        .readsect       = mtdblock_readsect,

        .writesect      = mtdblock_writesect,

        .add_mtd        = mtdblock_add_mtd,

        .remove_dev     = mtdblock_remove_dev,

        .owner          = THIS_MODULE,

};

static int __init mtdblock_init(void)

{

        return register_mtd_blktrans(&mtdblock_tr);

}

static void __exit mtdblock_exit(void)

{

        deregister_mtd_blktrans(&mtdblock_tr);

}

module_init(mtdblock_init);

module_exit(mtdblock_exit);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");

MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");