USB rebind Canon : unbind/rebind sysfs pour recovery hard DSLR PTP freeze

Escalade progressive : ioctl reset (tentative 2), unbind/rebind USB (tentative 3+)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/main.py

@@ -123,6 +123,30 @@ def _usb_reset_canon():
         log.debug(f"_usb_reset_canon: {e}")
 
 
+def _usb_rebind_canon():
+    """Unbind/rebind USB Canon — simule un debranchement/rebranchement physique."""
+    import glob
+    try:
+        for f in glob.glob("/sys/bus/usb/devices/*/idVendor"):
+            if open(f).read().strip() == "04a9":
+                dev_id = __import__("os.path", fromlist=["basename"]).basename(
+                    __import__("os.path", fromlist=["dirname"]).dirname(f)
+                )
+                log.info(f"USB rebind Canon: unbind {dev_id}")
+                with open("/sys/bus/usb/drivers/usb/unbind", "w") as fh:
+                    fh.write(dev_id)
+                import time
+                time.sleep(2)
+                with open("/sys/bus/usb/drivers/usb/bind", "w") as fh:
+                    fh.write(dev_id)
+                log.info(f"USB rebind Canon: bind {dev_id}")
+                time.sleep(3)
+                return True
+    except Exception as e:
+        log.warning(f"_usb_rebind_canon: {e}")
+    return False
+
+
 async def surveiller_dslr():
     """Surveille le DSLR en continu : detecte les deconnexions et reconnecte automatiquement.
     Apres plusieurs echecs, fait un reset USB ioctl pour debloquer le port PTP."""
@@ -158,11 +182,20 @@ async def surveiller_dslr():
 
 
 async def _reconnecter_dslr_avec_reset(echecs: int):
-    """Reconnexion DSLR avec reset USB progressif."""
+    """Reconnexion DSLR avec escalade progressive :
+    1-2 : ioctl reset
+    3+  : unbind/rebind USB (simule debranchement physique)
+    """
     camera.deconnecter()
     await diffuser_ws({"type": "camera_erreur", "message": "Appareil photo deconnecte"})
 
-    if echecs >= 2:
+    if echecs >= 3:
+        log.info(f"USB rebind Canon (echec #{echecs})...")
+        ok = await asyncio.get_event_loop().run_in_executor(None, _usb_rebind_canon)
+        if not ok:
+            _usb_reset_canon()
+            await asyncio.sleep(4)
+    elif echecs >= 2:
         log.info(f"Reset USB Canon (echec #{echecs})...")
         _usb_reset_canon()
         await asyncio.sleep(4)
@@ -176,15 +209,6 @@ async def _reconnecter_dslr_avec_reset(echecs: int):
         await diffuser_ws({"type": "camera_ok"})
     else:
         log.warning(f"Echec reconnexion DSLR (tentative {echecs})")
-        if echecs >= 3:
-            log.info("Reset USB force supplementaire...")
-            _usb_reset_canon()
-            await asyncio.sleep(5)
-            camera.connecter(source="gphoto2")
-            if camera.connectee:
-                log.info("DSLR reconnecte apres double reset")
-                _appliquer_config_camera()
-                await diffuser_ws({"type": "camera_ok"})
 
 
 def _appliquer_config_camera():