From cf0c41af965dec3ef390ef420f56bc6be4b31a88 Mon Sep 17 00:00:00 2001
From: royjr <royjr96@gmail.com>
Date: Sun, 30 Aug 2026 21:29:28 -0400
Subject: [PATCH] AuxPowerSave

---
 openpilot/common/params_keys.h                            | 1 +
 openpilot/sunnypilot/sunnylink/settings_ui.json           | 6 ++++++
 .../sunnylink/settings_ui_src/pages/device.yaml           | 4 ++++
 openpilot/system/hardware/hardwared.py                    | 8 +++++++-
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/openpilot/common/params_keys.h b/openpilot/common/params_keys.h
index 3c5f30ab3d..6b6328df58 100644
--- a/openpilot/common/params_keys.h
+++ b/openpilot/common/params_keys.h
@@ -132,6 +132,7 @@ inline static std::unordered_map<std::string, ParamKeyAttributes> keys = {
     {"UptimeOnroad", {PERSISTENT, FLOAT, "0.0"}},
     {"ChestnutActive", {CLEAR_ON_MANAGER_START | CLEAR_ON_OFFROAD_TRANSITION | CLEAR_ON_IGNITION_ON, BOOL}},
     {"ChestnutLoading", {CLEAR_ON_MANAGER_START | CLEAR_ON_OFFROAD_TRANSITION | CLEAR_ON_IGNITION_ON, BOOL}},
+    {"AuxPowerSave", {PERSISTENT | BACKUP, BOOL}},
     {"Version", {PERSISTENT, STRING}},
 
     // --- sunnypilot params --- //
diff --git a/openpilot/sunnypilot/sunnylink/settings_ui.json b/openpilot/sunnypilot/sunnylink/settings_ui.json
index 63bf342fcb..f0cbc07837 100644
--- a/openpilot/sunnypilot/sunnylink/settings_ui.json
+++ b/openpilot/sunnypilot/sunnylink/settings_ui.json
@@ -1675,6 +1675,12 @@
               "widget": "toggle",
               "title": "Onroad Uploads"
             },
+            {
+              "key": "AuxPowerSave",
+              "widget": "toggle",
+              "title": "Disable Aux Port When Offroad",
+              "description": "Power off the aux USB-C port while offroad to save power. It powers back on automatically when you go onroad."
+            },
             {
               "key": "MaxTimeOffroad",
               "widget": "option",
diff --git a/openpilot/sunnypilot/sunnylink/settings_ui_src/pages/device.yaml b/openpilot/sunnypilot/sunnylink/settings_ui_src/pages/device.yaml
index bf5f7883ab..d519a1f9b9 100644
--- a/openpilot/sunnypilot/sunnylink/settings_ui_src/pages/device.yaml
+++ b/openpilot/sunnypilot/sunnylink/settings_ui_src/pages/device.yaml
@@ -30,6 +30,10 @@ sections:
   - key: OnroadUploads
     widget: toggle
     title: Onroad Uploads
+  - key: AuxPowerSave
+    widget: toggle
+    title: Disable Aux Port When Offroad
+    description: Power off the aux USB-C port while offroad to save power. It powers back on automatically when you go onroad.
   - key: MaxTimeOffroad
     widget: option
     title: Max Time Offroad
diff --git a/openpilot/system/hardware/hardwared.py b/openpilot/system/hardware/hardwared.py
index 0b293941c8..e6e8486a1e 100755
--- a/openpilot/system/hardware/hardwared.py
+++ b/openpilot/system/hardware/hardwared.py
@@ -51,6 +51,9 @@ class Chestnut:
     self.last_attempt = 0.
     self.flashed = False
     self.vbus_on = None
+    self.params = Params()
+    self.powersave = False
+    self.last_offroad = None
 
   def flash(self) -> None:
     ret = subprocess.run(["sudo", sys.executable, os.path.join(BASEDIR, "openpilot/system/hardware/chestnut/flash.py"), CHESTNUT_FW_VERSION],
@@ -67,7 +70,10 @@ class Chestnut:
   def update(self, offroad: bool, usb_state: list[dict]) -> None:
     mismatch = any((d["vendorId"], d["productId"]) in CHESTNUT_USB_IDS + CHESTNUT_ROM_USB_IDS and
                    d["product"] != f"custom {CHESTNUT_FW_VERSION}-CLEAN" for d in usb_state)
-    self.set_vbus(not offroad or mismatch)
+    if offroad != self.last_offroad:
+      self.powersave = self.params.get_bool("AuxPowerSave")
+      self.last_offroad = offroad
+    self.set_vbus((not offroad or mismatch) or not self.powersave)
     if not mismatch:
       self.flashed = False
       return