From df76cd0a3e5745836891bfde05e37f97741261d4 Mon Sep 17 00:00:00 2001
From: Alex P <dtk077@gmail.com>
Date: Mon, 17 Nov 2025 23:18:58 +0200
Subject: [PATCH] Fix: reopen HID files on USB state transitions to prevent
 stale handles

When USB state transitions to "configured" (after reconnection or state
changes), automatically close and reopen HID file handles to ensure they
remain valid.
---
 usb.go | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/usb.go b/usb.go
index af57692f..debb96af 100644
--- a/usb.go
+++ b/usb.go
@@ -109,8 +109,18 @@ func checkUSBState() {
 		return
 	}
 
+	oldState := usbState
 	usbState = newState
-	usbLogger.Info().Str("from", usbState).Str("to", newState).Msg("USB state changed")
+	usbLogger.Info().Str("from", oldState).Str("to", newState).Msg("USB state changed")
+
+	if newState == "configured" && oldState != "configured" {
+		usbLogger.Info().Msg("USB configured, reopening HID files")
+		gadget.CloseHidFiles()
+		gadget.PreOpenHidFiles()
+		if err := gadget.OpenKeyboardHidFile(); err != nil {
+			usbLogger.Error().Err(err).Msg("failed to reopen keyboard hid file")
+		}
+	}
 
 	requestDisplayUpdate(true, "usb_state_changed")
 	triggerUSBStateUpdate()