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1 | /* |
2 | * Simple read-only (writable only for RAM) mtdblock driver |
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 | * |
20 | */ |
21 | |
22 | #include <linux/init.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/mtd/mtd.h> |
25 | #include <linux/mtd/blktrans.h> |
26 | #include <linux/module.h> |
27 | |
28 | static int mtdblock_readsect(struct mtd_blktrans_dev *dev, |
29 | unsigned long block, char *buf) |
30 | { |
31 | size_t retlen; |
32 | |
33 | if (mtd_read(dev->mtd, (block * 512), 512, &retlen, buf)) |
34 | return 1; |
35 | return 0; |
36 | } |
37 | |
38 | static int mtdblock_writesect(struct mtd_blktrans_dev *dev, |
39 | unsigned long block, char *buf) |
40 | { |
41 | size_t retlen; |
42 | |
43 | if (mtd_write(dev->mtd, (block * 512), 512, &retlen, buf)) |
44 | return 1; |
45 | return 0; |
46 | } |
47 | |
48 | static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) |
49 | { |
50 | struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
51 | |
52 | if (!dev) |
53 | return; |
54 | |
55 | dev->mtd = mtd; |
56 | dev->devnum = mtd->index; |
57 | |
58 | dev->size = mtd->size >> 9; |
59 | dev->tr = tr; |
60 | dev->readonly = 1; |
61 | |
62 | if (add_mtd_blktrans_dev(dev)) |
63 | kfree(dev); |
64 | } |
65 | |
66 | static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) |
67 | { |
68 | del_mtd_blktrans_dev(dev); |
69 | } |
70 | |
71 | static struct mtd_blktrans_ops mtdblock_tr = { |
72 | .name = "mtdblock", |
73 | .major = 31, |
74 | .part_bits = 0, |
75 | .blksize = 512, |
76 | .readsect = mtdblock_readsect, |
77 | .writesect = mtdblock_writesect, |
78 | .add_mtd = mtdblock_add_mtd, |
79 | .remove_dev = mtdblock_remove_dev, |
80 | .owner = THIS_MODULE, |
81 | }; |
82 | |
83 | static int __init mtdblock_init(void) |
84 | { |
85 | return register_mtd_blktrans(&mtdblock_tr); |
86 | } |
87 | |
88 | static void __exit mtdblock_exit(void) |
89 | { |
90 | deregister_mtd_blktrans(&mtdblock_tr); |
91 | } |
92 | |
93 | module_init(mtdblock_init); |
94 | module_exit(mtdblock_exit); |
95 | |
96 | MODULE_LICENSE("GPL"); |
97 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
98 | MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); |
99 |
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v2.6.34-rc5
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