projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| fd534e9b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 1da177e4 | 2 | /* |
| 1da177e4 | 3 | * Simple read-only (writable only for RAM) mtdblock driver |
| a1452a37 DW |
4 | * |
| 5 | * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org> | |
| 1da177e4 LT |
6 | */ |
| 7 | ||
| 8 | #include <linux/init.h> | |
| 9 | #include <linux/slab.h> | |
| 10 | #include <linux/mtd/mtd.h> | |
| 11 | #include <linux/mtd/blktrans.h> | |
| a0e5cc58 | 12 | #include <linux/module.h> |
| f83c3838 | 13 | #include <linux/major.h> |
| 1da177e4 LT |
14 | |
| 15 | static int mtdblock_readsect(struct mtd_blktrans_dev *dev, | |
| 16 | unsigned long block, char *buf) | |
| 17 | { | |
| 18 | size_t retlen; | |
| 19 | ||
| 329ad399 | 20 | if (mtd_read(dev->mtd, (block * 512), 512, &retlen, buf)) |
| 1da177e4 LT |
21 | return 1; |
| 22 | return 0; | |
| 23 | } | |
| 24 | ||
| 25 | static int mtdblock_writesect(struct mtd_blktrans_dev *dev, | |
| 26 | unsigned long block, char *buf) | |
| 27 | { | |
| 28 | size_t retlen; | |
| 29 | ||
| eda95cbf | 30 | if (mtd_write(dev->mtd, (block * 512), 512, &retlen, buf)) |
| 1da177e4 LT |
31 | return 1; |
| 32 | return 0; | |
| 33 | } | |
| 34 | ||
| 35 | static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) | |
| 36 | { | |
| 95b93a0c | 37 | struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1da177e4 LT |
38 | |
| 39 | if (!dev) | |
| 40 | return; | |
| 41 | ||
| 1da177e4 LT |
42 | dev->mtd = mtd; |
| 43 | dev->devnum = mtd->index; | |
| 19187672 | 44 | |
| 1da177e4 LT |
45 | dev->size = mtd->size >> 9; |
| 46 | dev->tr = tr; | |
| af63a3bc | 47 | dev->readonly = 1; |
| 1da177e4 | 48 | |
| 298304f1 ML |
49 | if (add_mtd_blktrans_dev(dev)) |
| 50 | kfree(dev); | |
| 1da177e4 LT |
51 | } |
| 52 | ||
| 53 | static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) | |
| 54 | { | |
| 55 | del_mtd_blktrans_dev(dev); | |
| 1da177e4 LT |
56 | } |
| 57 | ||
| 58 | static struct mtd_blktrans_ops mtdblock_tr = { | |
| 59 | .name = "mtdblock", | |
| 2aabeb20 | 60 | .major = MTD_BLOCK_MAJOR, |
| 1da177e4 | 61 | .part_bits = 0, |
| 19187672 | 62 | .blksize = 512, |
| 1da177e4 LT |
63 | .readsect = mtdblock_readsect, |
| 64 | .writesect = mtdblock_writesect, | |
| 65 | .add_mtd = mtdblock_add_mtd, | |
| 66 | .remove_dev = mtdblock_remove_dev, | |
| 67 | .owner = THIS_MODULE, | |
| 68 | }; | |
| 69 | ||
| 70 | static int __init mtdblock_init(void) | |
| 71 | { | |
| 72 | return register_mtd_blktrans(&mtdblock_tr); | |
| 73 | } | |
| 74 | ||
| 75 | static void __exit mtdblock_exit(void) | |
| 76 | { | |
| 77 | deregister_mtd_blktrans(&mtdblock_tr); | |
| 78 | } | |
| 79 | ||
| 80 | module_init(mtdblock_init); | |
| 81 | module_exit(mtdblock_exit); | |
| 82 | ||
| 83 | MODULE_LICENSE("GPL"); | |
| 84 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
| 85 | MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); |