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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright © 2022 Rafał Miłecki <rafal@milecki.pl>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/of.h>
#include <linux/slab.h>
#define TPLINK_SAFELOADER_DATA_OFFSET 4
#define TPLINK_SAFELOADER_MAX_PARTS 32
struct safeloader_cmn_header {
__be32 size;
uint32_t unused;
} __packed;
static void *mtd_parser_tplink_safeloader_read_table(struct mtd_info *mtd)
{
struct safeloader_cmn_header hdr;
struct device_node *np;
size_t bytes_read;
size_t size;
u32 offset;
char *buf;
int err;
np = mtd_get_of_node(mtd);
if (mtd_is_partition(mtd))
of_node_get(np);
else
np = of_get_child_by_name(np, "partitions");
if (of_property_read_u32(np, "partitions-table-offset", &offset)) {
pr_err("Failed to get partitions table offset\n");
goto err_put;
}
err = mtd_read(mtd, offset, sizeof(hdr), &bytes_read, (uint8_t *)&hdr);
if (err && !mtd_is_bitflip(err)) {
pr_err("Failed to read from %s at 0x%x\n", mtd->name, offset);
goto err_put;
}
size = be32_to_cpu(hdr.size);
buf = kmalloc(size + 1, GFP_KERNEL);
if (!buf)
goto err_put;
err = mtd_read(mtd, offset + sizeof(hdr), size, &bytes_read, buf);
if (err && !mtd_is_bitflip(err)) {
pr_err("Failed to read from %s at 0x%zx\n", mtd->name, offset + sizeof(hdr));
goto err_kfree;
}
buf[size] = '\0';
of_node_put(np);
return buf;
err_kfree:
kfree(buf);
err_put:
of_node_put(np);
return NULL;
}
static int mtd_parser_tplink_safeloader_parse(struct mtd_info *mtd,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct mtd_partition *parts;
char name[65];
size_t offset;
size_t bytes;
char *buf;
int idx;
int err;
parts = kcalloc(TPLINK_SAFELOADER_MAX_PARTS, sizeof(*parts), GFP_KERNEL);
if (!parts) {
err = -ENOMEM;
goto err_out;
}
buf = mtd_parser_tplink_safeloader_read_table(mtd);
if (!buf) {
err = -ENOENT;
goto err_free_parts;
}
for (idx = 0, offset = TPLINK_SAFELOADER_DATA_OFFSET;
idx < TPLINK_SAFELOADER_MAX_PARTS &&
sscanf(buf + offset, "partition %64s base 0x%llx size 0x%llx%zn\n",
name, &parts[idx].offset, &parts[idx].size, &bytes) == 3;
idx++, offset += bytes + 1) {
parts[idx].name = kstrdup(name, GFP_KERNEL);
if (!parts[idx].name) {
err = -ENOMEM;
goto err_free;
}
}
if (idx == TPLINK_SAFELOADER_MAX_PARTS)
pr_warn("Reached maximum number of partitions!\n");
kfree(buf);
*pparts = parts;
return idx;
err_free:
for (idx -= 1; idx >= 0; idx--)
kfree(parts[idx].name);
err_free_parts:
kfree(parts);
err_out:
return err;
};
static void mtd_parser_tplink_safeloader_cleanup(const struct mtd_partition *pparts,
int nr_parts)
{
int i;
for (i = 0; i < nr_parts; i++)
kfree(pparts[i].name);
kfree(pparts);
}
static const struct of_device_id mtd_parser_tplink_safeloader_of_match_table[] = {
{ .compatible = "tplink,safeloader-partitions" },
{},
};
MODULE_DEVICE_TABLE(of, mtd_parser_tplink_safeloader_of_match_table);
static struct mtd_part_parser mtd_parser_tplink_safeloader = {
.parse_fn = mtd_parser_tplink_safeloader_parse,
.cleanup = mtd_parser_tplink_safeloader_cleanup,
.name = "tplink-safeloader",
.of_match_table = mtd_parser_tplink_safeloader_of_match_table,
};
module_mtd_part_parser(mtd_parser_tplink_safeloader);
MODULE_LICENSE("GPL");
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