[bluetooth] Block suspend on bluez start/stop. JB#18661

While the idea of bluez tracking is to block suspend when it is expected
that either bluetooth daemon itself or other related parts in the sw stack
are processing something, bluez startup / restarts etc are not protected
against suspending.

Block suspend when org.bluez appears to / disappears from D-Bus SystemBus.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

.depend

@@ -531,16 +531,20 @@ modules/battery-upower.pic.o:\
 modules/bluetooth.o:\
 	modules/bluetooth.c\
 	builtin-gconf.h\
+	datapipe.h\
 	libwakelock.h\
 	mce-dbus.h\
 	mce-log.h\
+	mce.h\
 
 modules/bluetooth.pic.o:\
 	modules/bluetooth.c\
 	builtin-gconf.h\
+	datapipe.h\
 	libwakelock.h\
 	mce-dbus.h\
 	mce-log.h\
+	mce.h\
 
 modules/callstate.o:\
 	modules/callstate.c\

modules/bluetooth.c

@@ -19,6 +19,7 @@
  * License along with mce.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "../mce.h"
 #include "../mce-log.h"
 #include "../mce-dbus.h"
 #include "../libwakelock.h"
@@ -184,6 +185,76 @@ static void bluetooth_dbus_quit(void)
 {
     mce_dbus_handler_unregister_array(bluetooth_dbus_handlers);
 }
+/* ========================================================================= *
+ * DATAPIPE_TRACKING
+ * ========================================================================= */
+
+/** Availability of bluez; from bluez_available_pipe */
+static service_state_t bluez_available = SERVICE_STATE_UNDEF;
+
+/** Datapipe trigger for bluez availability
+ *
+ * @param data bluez D-Bus service availability (as a void pointer)
+ */
+static void bluetooth_datapipe_bluez_available_cb(gconstpointer const data)
+{
+    service_state_t prev = bluez_available;
+    bluez_available = GPOINTER_TO_INT(data);
+
+    if( bluez_available == prev )
+        goto EXIT;
+
+    mce_log(LL_DEVEL, "bluez dbus service: %s -> %s",
+            service_state_repr(prev),
+            service_state_repr(bluez_available));
+
+    switch( bluez_available ) {
+    case SERVICE_STATE_RUNNING:
+    case SERVICE_STATE_STOPPED:
+        bluetooth_suspend_block_start();
+        break;
+
+    default:
+        break;
+    }
+
+EXIT:
+    return;
+}
+
+/** Array of datapipe handlers */
+static datapipe_handler_t bluetooth_datapipe_handlers[] =
+{
+    // output triggers
+    {
+        .datapipe  = &bluez_available_pipe,
+        .output_cb = bluetooth_datapipe_bluez_available_cb,
+    },
+    // sentinel
+    {
+        .datapipe = 0,
+    }
+};
+
+static datapipe_bindings_t bluetooth_datapipe_bindings =
+{
+    .module   = "bluetooth",
+    .handlers = bluetooth_datapipe_handlers,
+};
+
+/** Append triggers/filters to datapipes
+ */
+static void bluetooth_datapipe_init(void)
+{
+    datapipe_bindings_init(&bluetooth_datapipe_bindings);
+}
+
+/** Remove triggers/filters from datapipes
+ */
+static void bluetooth_datapipe_quit(void)
+{
+    datapipe_bindings_quit(&bluetooth_datapipe_bindings);
+}
 
 /* ========================================================================= *
  * MODULE_LOAD_UNLOAD
@@ -199,6 +270,8 @@ const gchar *g_module_check_init(GModule *module)
 {
     (void)module;
 
+    bluetooth_datapipe_init();
+
     bluetooth_dbus_init();
 
     return 0;
@@ -212,6 +285,8 @@ void g_module_unload(GModule *module)
 {
     (void)module;
 
+    bluetooth_datapipe_quit();
+
     bluetooth_dbus_quit();
 
     bluetooth_suspend_block_stop();