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1 | /* |
2 | * (C) 2003 David Woodhouse <dwmw2@infradead.org> |
3 | * |
4 | * Simple read-only (writable only for RAM) mtdblock driver |
5 | */ |
6 | |
7 | #include <linux/init.h> |
8 | #include <linux/slab.h> |
9 | #include <linux/mtd/mtd.h> |
10 | #include <linux/mtd/blktrans.h> |
11 | |
12 | static int mtdblock_readsect(struct mtd_blktrans_dev *dev, |
13 | unsigned long block, char *buf) |
14 | { |
15 | size_t retlen; |
16 | |
17 | if (dev->mtd->read(dev->mtd, (block * 512), 512, &retlen, buf)) |
18 | return 1; |
19 | return 0; |
20 | } |
21 | |
22 | static int mtdblock_writesect(struct mtd_blktrans_dev *dev, |
23 | unsigned long block, char *buf) |
24 | { |
25 | size_t retlen; |
26 | |
27 | if (dev->mtd->write(dev->mtd, (block * 512), 512, &retlen, buf)) |
28 | return 1; |
29 | return 0; |
30 | } |
31 | |
32 | static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) |
33 | { |
34 | struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
35 | |
36 | if (!dev) |
37 | return; |
38 | |
39 | dev->mtd = mtd; |
40 | dev->devnum = mtd->index; |
41 | |
42 | dev->size = mtd->size >> 9; |
43 | dev->tr = tr; |
44 | dev->readonly = 1; |
45 | |
46 | add_mtd_blktrans_dev(dev); |
47 | } |
48 | |
49 | static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) |
50 | { |
51 | del_mtd_blktrans_dev(dev); |
52 | kfree(dev); |
53 | } |
54 | |
55 | static struct mtd_blktrans_ops mtdblock_tr = { |
56 | .name = "mtdblock", |
57 | .major = 31, |
58 | .part_bits = 0, |
59 | .blksize = 512, |
60 | .readsect = mtdblock_readsect, |
61 | .writesect = mtdblock_writesect, |
62 | .add_mtd = mtdblock_add_mtd, |
63 | .remove_dev = mtdblock_remove_dev, |
64 | .owner = THIS_MODULE, |
65 | }; |
66 | |
67 | static int __init mtdblock_init(void) |
68 | { |
69 | return register_mtd_blktrans(&mtdblock_tr); |
70 | } |
71 | |
72 | static void __exit mtdblock_exit(void) |
73 | { |
74 | deregister_mtd_blktrans(&mtdblock_tr); |
75 | } |
76 | |
77 | module_init(mtdblock_init); |
78 | module_exit(mtdblock_exit); |
79 | |
80 | MODULE_LICENSE("GPL"); |
81 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); |
82 | MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); |
83 |
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