OpenWrt – Rev 1

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/*
 *  Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
 *  Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
 *  Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
 *
 *  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/byteorder/generic.h>

#include "mtdsplit.h"

#define WRGG_NR_PARTS           2
#define WRGG_MIN_ROOTFS_OFFS    0x80000 /* 512KiB */
#define WRGG03_MAGIC            0x20080321
#define WRG_MAGIC               0x20040220

struct wrgg03_header {
        char            signature[32];
        uint32_t        magic1;
        uint32_t        magic2;
        char            version[16];
        char            model[16];
        uint32_t        flag[2];
        uint32_t        reserve[2];
        char            buildno[16];
        uint32_t        size;
        uint32_t        offset;
        char            devname[32];
        char            digest[16];
} __attribute__ ((packed));

struct wrg_header {
        char            signature[32];
        uint32_t        magic1;
        uint32_t        magic2;
        uint32_t        size;
        uint32_t        offset;
        char            devname[32];
        char            digest[16];
} __attribute__ ((packed));


static int mtdsplit_parse_wrgg(struct mtd_info *master,
                               const struct mtd_partition **pparts,
                               struct mtd_part_parser_data *data)
{
        struct wrgg03_header hdr;
        size_t hdr_len, retlen, kernel_ent_size;
        size_t rootfs_offset;
        struct mtd_partition *parts;
        enum mtdsplit_part_type type;
        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;

        /* sanity checks */
        if (le32_to_cpu(hdr.magic1) == WRGG03_MAGIC) {
                kernel_ent_size = hdr_len + be32_to_cpu(hdr.size);
        } else if (le32_to_cpu(hdr.magic1) == WRG_MAGIC) {
                kernel_ent_size = sizeof(struct wrg_header) + le32_to_cpu(
                                  ((struct wrg_header*)&hdr)->size);
        } else {
                return -EINVAL;
        }

        if (kernel_ent_size > master->size)
                return -EINVAL;

        /*
         * The size in the header covers the rootfs as well.
         * Start the search from an arbitrary offset.
         */
        err = mtd_find_rootfs_from(master, WRGG_MIN_ROOTFS_OFFS,
                                   master->size, &rootfs_offset, &type);
        if (err)
                return err;

        parts = kzalloc(WRGG_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 WRGG_NR_PARTS;
}

static const struct of_device_id mtdsplit_wrgg_of_match_table[] = {
        { .compatible = "wrg" },
        {},
};
MODULE_DEVICE_TABLE(of, mtdsplit_wrgg_of_match_table);

static struct mtd_part_parser mtdsplit_wrgg_parser = {
        .owner = THIS_MODULE,
        .name = "wrgg-fw",
        .of_match_table = mtdsplit_wrgg_of_match_table,
        .parse_fn = mtdsplit_parse_wrgg,
        .type = MTD_PARSER_TYPE_FIRMWARE,
};

static int __init mtdsplit_wrgg_init(void)
{
        register_mtd_parser(&mtdsplit_wrgg_parser);

        return 0;
}

subsys_initcall(mtdsplit_wrgg_init);