2 * Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/mtd/mtd.h>
15 #include <linux/mtd/partitions.h>
17 #include <asm/unaligned.h>
21 #define LZMA_NR_PARTS 2
22 #define LZMA_PROPERTIES_SIZE 5
25 u8 props[LZMA_PROPERTIES_SIZE];
30 static int mtdsplit_parse_lzma(struct mtd_info *master,
31 struct mtd_partition **pparts,
32 struct mtd_part_parser_data *data)
34 struct lzma_header hdr;
35 size_t hdr_len, retlen;
38 struct mtd_partition *parts;
41 hdr_len = sizeof(hdr);
42 err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
46 if (retlen != hdr_len)
49 /* verify LZMA properties */
50 if (hdr.props[0] >= (9 * 5 * 5))
53 t = get_unaligned_le32(&hdr.props[1]);
54 if (!is_power_of_2(t))
57 t = get_unaligned_le32(&hdr.size_high);
61 err = mtd_find_rootfs_from(master, master->erasesize,
62 master->size, &rootfs_offset);
66 parts = kzalloc(LZMA_NR_PARTS * sizeof(*parts), GFP_KERNEL);
70 parts[0].name = KERNEL_PART_NAME;
72 parts[0].size = rootfs_offset;
74 parts[1].name = ROOTFS_PART_NAME;
75 parts[1].offset = rootfs_offset;
76 parts[1].size = master->size - rootfs_offset;
82 static struct mtd_part_parser mtdsplit_lzma_parser = {
85 .parse_fn = mtdsplit_parse_lzma,
86 .type = MTD_PARSER_TYPE_FIRMWARE,
89 static int __init mtdsplit_lzma_init(void)
91 register_mtd_parser(&mtdsplit_lzma_parser);
96 subsys_initcall(mtdsplit_lzma_init);