Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
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 | { | |
95b93a0c | 34 | struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
1da177e4 LT |
35 | |
36 | if (!dev) | |
37 | return; | |
38 | ||
1da177e4 LT |
39 | dev->mtd = mtd; |
40 | dev->devnum = mtd->index; | |
19187672 | 41 | |
1da177e4 LT |
42 | dev->size = mtd->size >> 9; |
43 | dev->tr = tr; | |
af63a3bc | 44 | dev->readonly = 1; |
1da177e4 | 45 | |
298304f1 ML |
46 | if (add_mtd_blktrans_dev(dev)) |
47 | kfree(dev); | |
1da177e4 LT |
48 | } |
49 | ||
50 | static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) | |
51 | { | |
52 | del_mtd_blktrans_dev(dev); | |
1da177e4 LT |
53 | } |
54 | ||
55 | static struct mtd_blktrans_ops mtdblock_tr = { | |
56 | .name = "mtdblock", | |
57 | .major = 31, | |
58 | .part_bits = 0, | |
19187672 | 59 | .blksize = 512, |
1da177e4 LT |
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"); |