Merge branch 'parisc-4.6-5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[deliverable/linux.git] / drivers / mtd / mtdblock_ro.c
CommitLineData
1da177e4 1/*
1da177e4 2 * Simple read-only (writable only for RAM) mtdblock driver
a1452a37
DW
3 *
4 * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
1da177e4
LT
20 */
21
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/mtd/mtd.h>
25#include <linux/mtd/blktrans.h>
a0e5cc58 26#include <linux/module.h>
f83c3838 27#include <linux/major.h>
1da177e4
LT
28
29static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
30 unsigned long block, char *buf)
31{
32 size_t retlen;
33
329ad399 34 if (mtd_read(dev->mtd, (block * 512), 512, &retlen, buf))
1da177e4
LT
35 return 1;
36 return 0;
37}
38
39static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
40 unsigned long block, char *buf)
41{
42 size_t retlen;
43
eda95cbf 44 if (mtd_write(dev->mtd, (block * 512), 512, &retlen, buf))
1da177e4
LT
45 return 1;
46 return 0;
47}
48
49static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
50{
95b93a0c 51 struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4
LT
52
53 if (!dev)
54 return;
55
1da177e4
LT
56 dev->mtd = mtd;
57 dev->devnum = mtd->index;
19187672 58
1da177e4
LT
59 dev->size = mtd->size >> 9;
60 dev->tr = tr;
af63a3bc 61 dev->readonly = 1;
1da177e4 62
298304f1
ML
63 if (add_mtd_blktrans_dev(dev))
64 kfree(dev);
1da177e4
LT
65}
66
67static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
68{
69 del_mtd_blktrans_dev(dev);
1da177e4
LT
70}
71
72static struct mtd_blktrans_ops mtdblock_tr = {
73 .name = "mtdblock",
2aabeb20 74 .major = MTD_BLOCK_MAJOR,
1da177e4 75 .part_bits = 0,
19187672 76 .blksize = 512,
1da177e4
LT
77 .readsect = mtdblock_readsect,
78 .writesect = mtdblock_writesect,
79 .add_mtd = mtdblock_add_mtd,
80 .remove_dev = mtdblock_remove_dev,
81 .owner = THIS_MODULE,
82};
83
84static int __init mtdblock_init(void)
85{
86 return register_mtd_blktrans(&mtdblock_tr);
87}
88
89static void __exit mtdblock_exit(void)
90{
91 deregister_mtd_blktrans(&mtdblock_tr);
92}
93
94module_init(mtdblock_init);
95module_exit(mtdblock_exit);
96
97MODULE_LICENSE("GPL");
98MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
99MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices");
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