[charging] Expose charging suspendable on D-Bus. JB#59152

In devices where it is not possible to suspend charging, it makes
little sense to have charging hysteresis controls visible in
settings application.

Add dbus method for querying whether charging is suspendable as
an enabler for settings application side changes.

Required D-Bus constants are in mce-dev >= 1.32.0

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

mce.conf

@@ -237,6 +237,9 @@
 		<allow send_destination="com.nokia.mce"
 		       send_interface="com.nokia.mce.request"
 		       send_member="get_charging_state"/>
+		<allow send_destination="com.nokia.mce"
+		       send_interface="com.nokia.mce.request"
+		       send_member="get_charging_suspendable"/>
 
 		<allow send_destination="com.nokia.mce"
 		       send_interface="com.nokia.mce.request"

modules/charging.c

@@ -154,6 +154,7 @@ static gboolean mch_dbus_get_charging_state_cb       (DBusMessage *const req);
 static void     mch_dbus_send_forced_charging_state  (DBusMessage *const req);
 static gboolean mch_dbus_get_forced_charging_state_cb(DBusMessage *const req);
 static gboolean mch_dbus_set_forced_charging_state_cb(DBusMessage *const req);
+static gboolean mch_dbus_get_charging_suspendable_cb (DBusMessage *const req);
 static gboolean mch_dbus_initial_cb                  (gpointer aptr);
 static void     mch_dbus_init                        (void);
 static void     mch_dbus_quit                        (void);
@@ -1113,6 +1114,43 @@ mch_dbus_set_forced_charging_state_cb(DBusMessage *const req)
     return TRUE;
 }
 
+/** Callback for handling charging suspendable D-Bus queries
+ *
+ * @param req  method call message to reply
+ */
+static gboolean
+mch_dbus_get_charging_suspendable_cb(DBusMessage *const req)
+{
+    DBusMessage *rsp = NULL;
+    dbus_bool_t  val = (mch_control_path != NULL);
+
+    mce_log(LL_DEBUG, "%s query from: %s",
+            dbus_message_get_member(req),
+            mce_dbus_get_message_sender_ident(req));
+
+    if( !(rsp = dbus_new_method_reply(req)) )
+        goto EXIT;
+
+    if( !dbus_message_append_args(rsp,
+                                  DBUS_TYPE_BOOLEAN, &val,
+                                  DBUS_TYPE_INVALID) )
+        goto EXIT;
+
+    mce_log(LL_DEBUG, "%s reply: %s",
+            dbus_message_get_member(req),
+            val ? "true" : "false");
+
+    if( !dbus_message_get_no_reply(req) )
+        dbus_send_message(rsp), rsp = 0;
+
+EXIT:
+
+    if( rsp )
+        dbus_message_unref(rsp);
+
+    return TRUE;
+}
+
 /** Array of dbus message handlers */
 static mce_dbus_handler_t mch_dbus_handlers[] =
 {
@@ -1156,6 +1194,14 @@ static mce_dbus_handler_t mch_dbus_handlers[] =
         .args      =
         "    <arg direction=\"in\" name=\"forced_charging_state\" type=\"s\"/>\n"
     },
+    {
+        .interface = MCE_REQUEST_IF,
+        .name      = MCE_CHARGING_SUSPENDABLE_GET,
+        .type      = DBUS_MESSAGE_TYPE_METHOD_CALL,
+        .callback  = mch_dbus_get_charging_suspendable_cb,
+        .args      =
+        "    <arg direction=\"out\" name=\"charging_suspendable\" type=\"b\"/>\n"
+    },
     /* sentinel */
     {
         .interface = 0

rpm/mce.spec

@@ -19,7 +19,7 @@ BuildRequires:  pkgconfig(dsme) >= 0.65.0
 BuildRequires:  pkgconfig(thermalmanager_dbus_if)
 BuildRequires:  pkgconfig(libiphb)
 BuildRequires:  pkgconfig(glib-2.0) >= 2.36.0
-BuildRequires:  pkgconfig(mce) >= 1.31.0
+BuildRequires:  pkgconfig(mce) >= 1.32.0
 BuildRequires:  pkgconfig(libngf0) >= 0.24
 BuildRequires:  pkgconfig(libsystemd)
 BuildRequires:  kernel-headers >= 2.6.32