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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Simple read-only (writable only for RAM) mtdblock driver
- *
- * Copyright © 2001-2010 David Woodhouse <[email protected]>
- */
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/blktrans.h>
- #include <linux/module.h>
- #include <linux/major.h>
- static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
- unsigned long block, char *buf)
- {
- size_t retlen;
- if (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 (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;
- if (mtd_type_is_nand(mtd))
- pr_warn("%s: MTD device '%s' is NAND, please consider using UBI block devices instead.\n",
- tr->name, mtd->name);
- if (add_mtd_blktrans_dev(dev))
- kfree(dev);
- }
- static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
- {
- del_mtd_blktrans_dev(dev);
- }
- static struct mtd_blktrans_ops mtdblock_tr = {
- .name = "mtdblock",
- .major = MTD_BLOCK_MAJOR,
- .part_bits = 0,
- .blksize = 512,
- .readsect = mtdblock_readsect,
- .writesect = mtdblock_writesect,
- .add_mtd = mtdblock_add_mtd,
- .remove_dev = mtdblock_remove_dev,
- .owner = THIS_MODULE,
- };
- module_mtd_blktrans(mtdblock_tr);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("David Woodhouse <[email protected]>");
- MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");
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