[mutter/wip/kms-connector-add-remove: 3/3] monitor-manager/kms: Get hotplug events from MetaKms

[Jonas Ådahl <jadahl src gnome org>]

commit 9582f7b207a77c431771c52aa9481d14e172ffbc
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Aug 22 15:15:51 2019 +0200

    monitor-manager/kms: Get hotplug events from MetaKms
    
    This makes it clearer that MetaMonitorManagerKms keeps updated as
    MetaKms updates its state.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/743

 src/backends/native/meta-kms.c                 | 19 +++++++++++++
 src/backends/native/meta-monitor-manager-kms.c | 37 +++++++++-----------------
 2 files changed, 31 insertions(+), 25 deletions(-)
---
diff --git a/src/backends/native/meta-kms.c b/src/backends/native/meta-kms.c
index 8397f872e..39d1f3155 100644
--- a/src/backends/native/meta-kms.c
+++ b/src/backends/native/meta-kms.c
@@ -119,6 +119,15 @@
  *
  */
 
+enum
+{
+  RESOURCES_CHANGED,
+
+  N_SIGNALS
+};
+
+static int signals[N_SIGNALS];
+
 typedef struct _MetaKmsCallbackData
 {
   MetaKmsCallback callback;
@@ -503,6 +512,8 @@ handle_hotplug_event (MetaKms *kms)
                                     META_KMS_UPDATE_STATES_FLAG_HOTPLUG,
                                     &error))
     g_warning ("Updating KMS state failed: %s", error->message);
+
+  g_signal_emit (kms, signals[RESOURCES_CHANGED], 0);
 }
 
 static void
@@ -605,4 +616,12 @@ meta_kms_class_init (MetaKmsClass *klass)
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
   object_class->finalize = meta_kms_finalize;
+
+  signals[RESOURCES_CHANGED] =
+    g_signal_new ("resources-changed",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  0,
+                  NULL, NULL, NULL,
+                  G_TYPE_NONE, 0);
 }
diff --git a/src/backends/native/meta-monitor-manager-kms.c b/src/backends/native/meta-monitor-manager-kms.c
index 26c2ddb61..389f3f9a9 100644
--- a/src/backends/native/meta-monitor-manager-kms.c
+++ b/src/backends/native/meta-monitor-manager-kms.c
@@ -75,8 +75,7 @@ struct _MetaMonitorManagerKms
 {
   MetaMonitorManager parent_instance;
 
-  guint hotplug_handler_id;
-  guint removed_handler_id;
+  gulong kms_resources_changed_handler_id;
 };
 
 struct _MetaMonitorManagerKmsClass
@@ -479,16 +478,8 @@ handle_hotplug_event (MetaMonitorManager *manager)
 }
 
 static void
-on_udev_hotplug (MetaUdev           *udev,
-                 MetaMonitorManager *manager)
-{
-  handle_hotplug_event (manager);
-}
-
-static void
-on_udev_device_removed (MetaUdev           *udev,
-                        GUdevDevice        *device,
-                        MetaMonitorManager *manager)
+on_kms_resources_changed (MetaKms            *kms,
+                          MetaMonitorManager *manager)
 {
   handle_hotplug_event (manager);
 }
@@ -498,14 +489,12 @@ meta_monitor_manager_kms_connect_hotplug_handler (MetaMonitorManagerKms *manager
 {
   MetaMonitorManager *manager = META_MONITOR_MANAGER (manager_kms);
   MetaBackend *backend = meta_monitor_manager_get_backend (manager);
-  MetaUdev *udev = meta_backend_native_get_udev (META_BACKEND_NATIVE (backend));
-
-  manager_kms->hotplug_handler_id =
-    g_signal_connect_after (udev, "hotplug",
-                            G_CALLBACK (on_udev_hotplug), manager);
-  manager_kms->removed_handler_id =
-    g_signal_connect_after (udev, "device-removed",
-                            G_CALLBACK (on_udev_device_removed), manager);
+  MetaBackendNative *backend_native = META_BACKEND_NATIVE (backend);
+  MetaKms *kms = meta_backend_native_get_kms (backend_native);
+
+  manager_kms->kms_resources_changed_handler_id =
+    g_signal_connect (kms, "resources-changed",
+                      G_CALLBACK (on_kms_resources_changed), manager);
 }
 
 static void
@@ -513,12 +502,10 @@ meta_monitor_manager_kms_disconnect_hotplug_handler (MetaMonitorManagerKms *mana
 {
   MetaMonitorManager *manager = META_MONITOR_MANAGER (manager_kms);
   MetaBackend *backend = meta_monitor_manager_get_backend (manager);
-  MetaUdev *udev = meta_backend_native_get_udev (META_BACKEND_NATIVE (backend));
+  MetaBackendNative *backend_native = META_BACKEND_NATIVE (backend);
+  MetaKms *kms = meta_backend_native_get_kms (backend_native);
 
-  g_signal_handler_disconnect (udev, manager_kms->hotplug_handler_id);
-  manager_kms->hotplug_handler_id = 0;
-  g_signal_handler_disconnect (udev, manager_kms->removed_handler_id);
-  manager_kms->removed_handler_id = 0;
+  g_clear_signal_handler (&manager_kms->kms_resources_changed_handler_id, kms);
 }
 
 void