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