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1da177e4 LT |
1 | /* |
2 | * $Id: mtdblock_ro.c,v 1.19 2004/11/16 18:28:59 dwmw2 Exp $ | |
3 | * | |
4 | * (C) 2003 David Woodhouse <dwmw2@infradead.org> | |
5 | * | |
6 | * Simple read-only (writable only for RAM) mtdblock driver | |
7 | */ | |
8 | ||
9 | #include <linux/init.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/mtd/mtd.h> | |
12 | #include <linux/mtd/blktrans.h> | |
13 | ||
14 | static int mtdblock_readsect(struct mtd_blktrans_dev *dev, | |
15 | unsigned long block, char *buf) | |
16 | { | |
17 | size_t retlen; | |
18 | ||
19 | if (dev->mtd->read(dev->mtd, (block * 512), 512, &retlen, buf)) | |
20 | return 1; | |
21 | return 0; | |
22 | } | |
23 | ||
24 | static int mtdblock_writesect(struct mtd_blktrans_dev *dev, | |
25 | unsigned long block, char *buf) | |
26 | { | |
27 | size_t retlen; | |
28 | ||
29 | if (dev->mtd->write(dev->mtd, (block * 512), 512, &retlen, buf)) | |
30 | return 1; | |
31 | return 0; | |
32 | } | |
33 | ||
34 | static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) | |
35 | { | |
95b93a0c | 36 | struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
37 | |
38 | if (!dev) | |
39 | return; | |
40 | ||
1da177e4 LT |
41 | dev->mtd = mtd; |
42 | dev->devnum = mtd->index; | |
19187672 | 43 | |
1da177e4 LT |
44 | dev->size = mtd->size >> 9; |
45 | dev->tr = tr; | |
af63a3bc | 46 | dev->readonly = 1; |
1da177e4 LT |
47 | |
48 | add_mtd_blktrans_dev(dev); | |
49 | } | |
50 | ||
51 | static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) | |
52 | { | |
53 | del_mtd_blktrans_dev(dev); | |
54 | kfree(dev); | |
55 | } | |
56 | ||
57 | static struct mtd_blktrans_ops mtdblock_tr = { | |
58 | .name = "mtdblock", | |
59 | .major = 31, | |
60 | .part_bits = 0, | |
19187672 | 61 | .blksize = 512, |
1da177e4 LT |
62 | .readsect = mtdblock_readsect, |
63 | .writesect = mtdblock_writesect, | |
64 | .add_mtd = mtdblock_add_mtd, | |
65 | .remove_dev = mtdblock_remove_dev, | |
66 | .owner = THIS_MODULE, | |
67 | }; | |
68 | ||
69 | static int __init mtdblock_init(void) | |
70 | { | |
71 | return register_mtd_blktrans(&mtdblock_tr); | |
72 | } | |
73 | ||
74 | static void __exit mtdblock_exit(void) | |
75 | { | |
76 | deregister_mtd_blktrans(&mtdblock_tr); | |
77 | } | |
78 | ||
79 | module_init(mtdblock_init); | |
80 | module_exit(mtdblock_exit); | |
81 | ||
82 | MODULE_LICENSE("GPL"); | |
83 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
84 | MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); |