Merge request !1433 from 'id-mm-max-timeouts'

base-modem: make max timeouts configurable via udev rule

https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/1433

include/ModemManager-tags.h

@@ -350,6 +350,22 @@
  */
 #define ID_MM_AT_NETWORK_TIME_BROKEN "ID_MM_AT_NETWORK_TIME_BROKEN"
 
+/**
+ * ID_MM_MAX_TIMEOUTS:
+ *
+ * This is a device-specific tag that allows users to specify the maximum number
+ * of consecutive command timeouts allowed before the modem is marked as invalid
+ * and re-probed.
+ *
+ * An integer value greater or equal than 0 must be given. The value 0 in this
+ * tag completely disables the timeout monitoring feature.
+ *
+ * If not given, the default value of 10 consecutive timeouts is used.
+ *
+ * Since: 1.26
+ */
+#define ID_MM_MAX_TIMEOUTS "ID_MM_MAX_TIMEOUTS"
+
 /*
  * The following symbols are deprecated. We don't add them to -compat
  * because this -tags file is not really part of the installed API.

src/mm-base-modem.c

@@ -446,6 +446,17 @@ base_modem_internal_grab_port (MMBaseModem         *self,
 #endif
     }
 
+    /* Check if a custom max timeouts value is set via udev */
+    if (mm_kernel_device_has_global_property (kernel_device, ID_MM_MAX_TIMEOUTS)) {
+        guint max_timeouts;
+
+        max_timeouts = mm_kernel_device_get_global_property_as_int (kernel_device, ID_MM_MAX_TIMEOUTS);
+        if (max_timeouts != self->priv->max_timeouts) {
+            mm_obj_dbg (self, "max timeouts overridden via udev: %u", max_timeouts);
+            self->priv->max_timeouts = max_timeouts;
+        }
+    }
+
     if (port_monitoring) {
         if (self->priv->max_timeouts > 0)
             g_signal_connect (port,