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-rw-r--r--target/linux/generic/files/drivers/mtd/mtdsplit_lzma.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit_lzma.c b/target/linux/generic/files/drivers/mtd/mtdsplit_lzma.c
new file mode 100644
index 0000000000..d23060a7d5
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit_lzma.c
@@ -0,0 +1,95 @@
+/*
+ * 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 <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,
+ 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);
+ 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 struct mtd_part_parser mtdsplit_lzma_parser = {
+ .owner = THIS_MODULE,
+ .name = "lzma-fw",
+ .parse_fn = mtdsplit_parse_lzma,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int
+mtdsplit_lzma_init(void)
+{
+ return register_mtd_parser(&mtdsplit_lzma_parser);
+}
+
+subsys_initcall(mtdsplit_lzma_init);