+/*
+ * 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
+
+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));
+
+
+static int mtdsplit_parse_wrgg(struct mtd_info *master,
+ 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)
+ return -EINVAL;
+
+ kernel_ent_size = hdr_len + be32_to_cpu(hdr.size);
+
+ 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 struct mtd_part_parser mtdsplit_wrgg_parser = {
+ .owner = THIS_MODULE,
+ .name = "wrgg-fw",
+ .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);
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