P2P: Add P2P Cancel method over D-Bus interface

This patch adds P2P Cancel method over
fi.w1.wpa_supplicant1.Interface.P2PDevice dbus interface.

Signed-off-by: Nishant Chaprana <n.chaprana@samsung.com>

doc/dbus.doxygen

@@ -1073,6 +1073,11 @@ Interface for performing P2P (Wi-Fi Peer-to-Peer) P2P Device operations.
     </dl>
   </li>
 
+  <li>
+    <h3>Cancel ( nothing ) --> nothing</h3>
+    <p>Stop ongoing P2P group formation operation.</p>
+  </li>
+
   <li>
     <h3>Invite ( a{sv} : args ) --> nothing</h3>
     <p>Invite a peer to join an already operating group or to re-invoke a persistent group.</p>

wpa_supplicant/dbus/dbus_new.c

@@ -2648,6 +2648,12 @@ static const struct wpa_dbus_method_desc wpas_dbus_interface_methods[] = {
 		  END_ARGS
 	  }
 	},
+	{ "Cancel", WPAS_DBUS_NEW_IFACE_P2PDEVICE,
+	  (WPADBusMethodHandler) wpas_dbus_handler_p2p_cancel,
+	  {
+		  END_ARGS
+	  }
+	},
 	{ "Invite", WPAS_DBUS_NEW_IFACE_P2PDEVICE,
 	  (WPADBusMethodHandler) wpas_dbus_handler_p2p_invite,
 	  {

wpa_supplicant/dbus/dbus_new_handlers_p2p.c

@@ -575,6 +575,26 @@ inv_args:
 }
 
 
+/**
+ * wpas_dbus_handler_p2p_cancel - Cancel P2P group formation
+ * @message: Pointer to incoming dbus message
+ * @wpa_s: %wpa_supplicant data structure
+ * Returns: NULL on success or DBus error on failure
+ *
+ * Handler for "Cancel" method call. Returns NULL if P2P cancel succeeds or DBus
+ * error on P2P cancel failure
+ */
+DBusMessage * wpas_dbus_handler_p2p_cancel(DBusMessage *message,
+					   struct wpa_supplicant *wpa_s)
+{
+	if (wpas_p2p_cancel(wpa_s))
+		return wpas_dbus_error_unknown_error(message,
+						     "P2P cancel failed");
+
+	return NULL;
+}
+
+
 DBusMessage * wpas_dbus_handler_p2p_invite(DBusMessage *message,
 					   struct wpa_supplicant *wpa_s)
 {

wpa_supplicant/dbus/dbus_new_handlers_p2p.h

@@ -46,6 +46,9 @@ DBusMessage *wpas_dbus_handler_p2p_connect(
 		DBusMessage *message,
 		struct wpa_supplicant *wpa_s);
 
+DBusMessage * wpas_dbus_handler_p2p_cancel(DBusMessage *message,
+					   struct wpa_supplicant *wpa_s);
+
 DBusMessage *wpas_dbus_handler_p2p_invite(
 		DBusMessage *message,
 		struct wpa_supplicant *wpa_s);