| /* |
| * Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published |
| * by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/of.h> |
| |
| #include <asm/unaligned.h> |
| |
| #include "mtdsplit.h" |
| |
| #define LZMA_NR_PARTS 2 |
| #define LZMA_PROPERTIES_SIZE 5 |
| |
| struct lzma_header { |
| u8 props[LZMA_PROPERTIES_SIZE]; |
| u8 size_low[4]; |
| u8 size_high[4]; |
| }; |
| |
| static int mtdsplit_parse_lzma(struct mtd_info *master, |
| const struct mtd_partition **pparts, |
| struct mtd_part_parser_data *data) |
| { |
| struct lzma_header hdr; |
| size_t hdr_len, retlen; |
| size_t rootfs_offset; |
| u32 t; |
| struct mtd_partition *parts; |
| int err; |
| |
| hdr_len = sizeof(hdr); |
| err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr); |
| if (err) |
| return err; |
| |
| if (retlen != hdr_len) |
| return -EIO; |
| |
| /* verify LZMA properties */ |
| if (hdr.props[0] >= (9 * 5 * 5)) |
| return -EINVAL; |
| |
| t = get_unaligned_le32(&hdr.props[1]); |
| if (!is_power_of_2(t)) |
| return -EINVAL; |
| |
| t = get_unaligned_le32(&hdr.size_high); |
| if (t) |
| return -EINVAL; |
| |
| err = mtd_find_rootfs_from(master, master->erasesize, master->size, |
| &rootfs_offset, NULL); |
| if (err) |
| return err; |
| |
| parts = kzalloc(LZMA_NR_PARTS * sizeof(*parts), GFP_KERNEL); |
| if (!parts) |
| return -ENOMEM; |
| |
| parts[0].name = KERNEL_PART_NAME; |
| parts[0].offset = 0; |
| parts[0].size = rootfs_offset; |
| |
| parts[1].name = ROOTFS_PART_NAME; |
| parts[1].offset = rootfs_offset; |
| parts[1].size = master->size - rootfs_offset; |
| |
| *pparts = parts; |
| return LZMA_NR_PARTS; |
| } |
| |
| static const struct of_device_id mtdsplit_lzma_of_match_table[] = { |
| { .compatible = "lzma" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, mtdsplit_lzma_of_match_table); |
| |
| static struct mtd_part_parser mtdsplit_lzma_parser = { |
| .owner = THIS_MODULE, |
| .name = "lzma-fw", |
| .of_match_table = mtdsplit_lzma_of_match_table, |
| .parse_fn = mtdsplit_parse_lzma, |
| .type = MTD_PARSER_TYPE_FIRMWARE, |
| }; |
| |
| static int __init mtdsplit_lzma_init(void) |
| { |
| register_mtd_parser(&mtdsplit_lzma_parser); |
| |
| return 0; |
| } |
| |
| subsys_initcall(mtdsplit_lzma_init); |