[PATCH V2 2/2] mtd: parsers: add TP-Link SafeLoader partitions table parser

["Rafał Miłecki" <zajec5@gmail.com>]

From: Rafał Miłecki <rafal@milecki.pl>

This parser deals with most TP-Link home routers. It reads info about
partitions and registers them in the MTD subsystem.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
V2: Fix types (thanks kernel test robot)
    Fix off-by-one when setting '\0'
---
 drivers/mtd/parsers/Kconfig             |  15 +++
 drivers/mtd/parsers/Makefile            |   1 +
 drivers/mtd/parsers/tplink_safeloader.c | 150 ++++++++++++++++++++++++
 3 files changed, 166 insertions(+)
 create mode 100644 drivers/mtd/parsers/tplink_safeloader.c

diff --git a/drivers/mtd/parsers/Kconfig b/drivers/mtd/parsers/Kconfig
index aaa06050c9bc..c258ba2a3a6f 100644
--- a/drivers/mtd/parsers/Kconfig
+++ b/drivers/mtd/parsers/Kconfig
@@ -123,6 +123,21 @@ config MTD_AFS_PARTS
 	  for your particular device. It won't happen automatically. The
 	  'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
 
+config MTD_PARSER_TPLINK_SAFELOADER
+	tristate "TP-Link Safeloader partitions parser"
+	depends on MTD && (ARCH_BCM_5301X || ATH79 || SOC_MT7620 || SOC_MT7621 || COMPILE_TEST)
+	help
+	  TP-Link home routers use flash partitions to store various data. Info
+	  about flash space layout is stored in a partitions table using a
+	  custom ASCII-based format.
+
+	  That format was first found in devices with SafeLoader bootloader and
+	  was named after it. Later it was adapted to CFE and U-Boot
+	  bootloaders.
+
+	  This driver reads partitions table, parses it and creates MTD
+	  partitions.
+
 config MTD_PARSER_TRX
 	tristate "Parser for TRX format partitions"
 	depends on MTD && (BCM47XX || ARCH_BCM_5301X || ARCH_MEDIATEK || RALINK || COMPILE_TEST)
diff --git a/drivers/mtd/parsers/Makefile b/drivers/mtd/parsers/Makefile
index 23fa4de4016f..0e70b621a1d8 100644
--- a/drivers/mtd/parsers/Makefile
+++ b/drivers/mtd/parsers/Makefile
@@ -10,6 +10,7 @@ ofpart-$(CONFIG_MTD_OF_PARTS_BCM4908)	+= ofpart_bcm4908.o
 ofpart-$(CONFIG_MTD_OF_PARTS_LINKSYS_NS)+= ofpart_linksys_ns.o
 obj-$(CONFIG_MTD_PARSER_IMAGETAG)	+= parser_imagetag.o
 obj-$(CONFIG_MTD_AFS_PARTS)		+= afs.o
+obj-$(CONFIG_MTD_PARSER_TPLINK_SAFELOADER)	+= tplink_safeloader.o
 obj-$(CONFIG_MTD_PARSER_TRX)		+= parser_trx.o
 obj-$(CONFIG_MTD_SERCOMM_PARTS)		+= scpart.o
 obj-$(CONFIG_MTD_SHARPSL_PARTS)		+= sharpslpart.o
diff --git a/drivers/mtd/parsers/tplink_safeloader.c b/drivers/mtd/parsers/tplink_safeloader.c
new file mode 100644
index 000000000000..23584a477391
--- /dev/null
+++ b/drivers/mtd/parsers/tplink_safeloader.c
@@ -0,0 +1,150 @@
+// 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 offset;
+	size_t size;
+	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", (u32 *)&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%zx\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_out;
+	}
+
+	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_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");
-- 
2.34.1