[PATCH -next 12/14] kddv/tests: Add support for testing mtd driver

[Zhang Xiaoxu <zhangxiaoxu@xxxxxxxxxxxxxxx>]

From: Zhang Xiaoxu <zhangxiaoxu5@xxxxxxxxxx>

This implement some helper function for mtd device,
mtd driver test case can inherit 'MTDDriver' to simplify code.

Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu@xxxxxxxxxx>
---
 tools/testing/kddv/kddv/tests/mtd/__init__.py | 63 +++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 tools/testing/kddv/kddv/tests/mtd/__init__.py

diff --git a/tools/testing/kddv/kddv/tests/mtd/__init__.py b/tools/testing/kddv/kddv/tests/mtd/__init__.py
new file mode 100644
index 000000000000..4defd92deb05
--- /dev/null
+++ b/tools/testing/kddv/kddv/tests/mtd/__init__.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+#
+# Kernel device driver verification
+#
+# Copyright (C) 2022-2023 Huawei Technologies Co., Ltd
+# Author: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
+
+import os
+import logging
+
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+class MTD(object):
+    def __init__(self, path):
+        mtd = next(path.glob("mtd/mtd*")).name
+        self.cdev = Path(f"/sys/class/mtd/{mtd}")
+        self.rdev = f"/dev/{mtd}"
+
+    def read_bytes(self, len, offset = 0):
+        with open(self.rdev, "rb") as dev:
+            if offset:
+                dev.seek(offset)
+            return dev.read(len)
+
+    def write_bytes(self, data, offset = 0):
+        with open(self.rdev, "wb") as dev:
+            if offset:
+                dev.seek(offset)
+            dev.write(data)
+
+    def read_attr(self, attr):
+        path = self.cdev / attr
+        logger.debug(f"read from {path}")
+        if not os.path.exists(path):
+            return f"attr '{attr}' not exists"
+        return path.read_text().rstrip()
+
+    def write_attr(self, attr, val):
+        path = self.cdev / attr
+        if not os.path.exists(path):
+            return f"attr '{attr}' not exists"
+        logger.debug(f"write '{val}' to {path}")
+        return path.write_bytes(val.encode())
+
+class MTDDriver(object):
+    def mtd_read_attr(self, dev, attr):
+        mtddev = MTD(dev.path)
+        return mtddev.read_attr(attr)
+
+    def mtd_write_attr(self, dev, attr, val):
+        mtddev = MTD(dev.path)
+        return mtddev.write_attr(attr)
+
+    def mtd_read_bytes(self, dev, len):
+        mtddev = MTD(dev.path)
+        return mtddev.read_bytes(len)
+
+    def mtd_write_bytes(self, dev, data):
+        mtddev = MTD(dev.path)
+        return mtddev.write_bytes(data)
-- 
2.34.1