projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 1da177e4 | 2 | * Simple read-only (writable only for RAM) mtdblock driver |
| a1452a37 DW |
3 | * |
| 4 | * Copyright © 2001-2010 David Woodhouse <[email protected]> | |
| 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 | * | |
| 1da177e4 LT |
20 | */ |
| 21 | ||
| 22 | #include <linux/init.h> | |
| 23 | #include <linux/slab.h> | |
| 24 | #include <linux/mtd/mtd.h> | |
| 25 | #include <linux/mtd/blktrans.h> | |
| a0e5cc58 | 26 | #include <linux/module.h> |
| f83c3838 | 27 | #include <linux/major.h> |
| 1da177e4 LT |
28 | |
| 29 | static int mtdblock_readsect(struct mtd_blktrans_dev *dev, | |
| 30 | unsigned long block, char *buf) | |
| 31 | { | |
| 32 | size_t retlen; | |
| 33 | ||
| 329ad399 | 34 | if (mtd_read(dev->mtd, (block * 512), 512, &retlen, buf)) |
| 1da177e4 LT |
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 | ||
| eda95cbf | 44 | if (mtd_write(dev->mtd, (block * 512), 512, &retlen, buf)) |
| 1da177e4 LT |
45 | return 1; |
| 46 | return 0; | |
| 47 | } | |
| 48 | ||
| 49 | static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) | |
| 50 | { | |
| 95b93a0c | 51 | struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1da177e4 LT |
52 | |
| 53 | if (!dev) | |
| 54 | return; | |
| 55 | ||
| 1da177e4 LT |
56 | dev->mtd = mtd; |
| 57 | dev->devnum = mtd->index; | |
| 19187672 | 58 | |
| 1da177e4 LT |
59 | dev->size = mtd->size >> 9; |
| 60 | dev->tr = tr; | |
| af63a3bc | 61 | dev->readonly = 1; |
| 1da177e4 | 62 | |
| 298304f1 ML |
63 | if (add_mtd_blktrans_dev(dev)) |
| 64 | kfree(dev); | |
| 1da177e4 LT |
65 | } |
| 66 | ||
| 67 | static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) | |
| 68 | { | |
| 69 | del_mtd_blktrans_dev(dev); | |
| 1da177e4 LT |
70 | } |
| 71 | ||
| 72 | static struct mtd_blktrans_ops mtdblock_tr = { | |
| 73 | .name = "mtdblock", | |
| 2aabeb20 | 74 | .major = MTD_BLOCK_MAJOR, |
| 1da177e4 | 75 | .part_bits = 0, |
| 19187672 | 76 | .blksize = 512, |
| 1da177e4 LT |
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 <[email protected]>"); | |
| 99 | MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); |