X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/blobdiff_plain/e689ec081a500d26d8f5d8e8bfe4755f644d7886..369514a11aaeab1b4c133e36b8cac30d3fb47ed0:/src/adafruit_blinka/microcontroller/alias.py

diff --git a/src/adafruit_blinka/microcontroller/alias.py b/src/adafruit_blinka/microcontroller/alias.py
new file mode 100644
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+++ b/src/adafruit_blinka/microcontroller/alias.py
@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: 2023 Steve Jeong for Hardkernel
+#
+# SPDX-License-Identifier: MIT
+
+from typing import Optional
+import os
+import re
+
+def get_dts_alias(device: str) -> Optional[str]:
+    """Get the Device Tree Alias"""
+    uevent_path = "/sys/bus/platform/devices/" + device + "/uevent"
+    if os.path.exists(uevent_path):
+        with open(uevent_path, "r", encoding="utf-8") as fd:
+            pattern = r"^OF_ALIAS_0=(.*)$"
+            uevent = fd.read().split("\n")
+            for line in uevent:
+                match = re.search(pattern, line)
+                if match:
+                    return match.group(1).upper()
+    return None