api,dbus: new `Command' method in the API to send arbitrary AT commands

BUG=chromium-os:25348
TEST="mmcli -m 0 --command='E0'"
Change-Id: I320587560fde5780f9d5a4998e32364d36a71ed7

src/mm-broadband-modem.c

@@ -1861,6 +1861,35 @@ modem_power_up (MMIfaceModem *self,
     g_object_unref (result);
 }
 
+/*****************************************************************************/
+/* Sending a command to the modem (Modem interface) */
+
+static const gchar *
+modem_command_finish (MMIfaceModem *self,
+                      GAsyncResult *res,
+                      GError **error)
+{
+    return mm_base_modem_at_command_finish (MM_BASE_MODEM (self),
+                                            res,
+                                            error);
+}
+
+static void
+modem_command (MMIfaceModem *self,
+               const gchar *cmd,
+               guint timeout,
+               GAsyncReadyCallback callback,
+               gpointer user_data)
+{
+
+    mm_base_modem_at_command (MM_BASE_MODEM (self), cmd, timeout,
+                              FALSE,
+                              NULL, /* cancellable */
+                              callback,
+                              user_data);
+}
+
+
 /*****************************************************************************/
 /* Initializing the modem (Modem interface) */
 
@@ -6668,6 +6697,8 @@ iface_modem_init (MMIfaceModem *iface)
     iface->load_signal_quality_finish = modem_load_signal_quality_finish;
     iface->create_bearer = modem_create_bearer;
     iface->create_bearer_finish = modem_create_bearer_finish;
+    iface->command = modem_command;
+    iface->command_finish = modem_command_finish;
 }
 
 static void

src/mm-iface-modem.c

@@ -20,6 +20,7 @@
 #include "mm-modem-helpers.h"
 #include "mm-iface-modem.h"
 #include "mm-base-modem.h"
+#include "mm-base-modem-at.h"
 #include "mm-sim.h"
 #include "mm-bearer-list.h"
 #include "mm-log.h"
@@ -302,6 +303,57 @@ handle_create_bearer (MmGdbusModem *skeleton,
     return TRUE;
 }
 
+static void
+command_done (MMIfaceModem *self,
+              GAsyncResult *res,
+              DbusCallContext *ctx)
+{
+    GError *error = NULL;
+    const gchar *result;
+
+    result = MM_IFACE_MODEM_GET_INTERFACE (self)->command_finish (self,
+                                                                  res,
+                                                                  &error);
+    if (error)
+        g_dbus_method_invocation_take_error (ctx->invocation,
+                                             error);
+    else
+        mm_gdbus_modem_complete_command (ctx->skeleton,
+                                         ctx->invocation,
+                                         result);
+    dbus_call_context_free (ctx);
+}
+
+static gboolean
+handle_command (MmGdbusModem *skeleton,
+                GDBusMethodInvocation *invocation,
+                const gchar *cmd,
+                guint timeout,
+                MMIfaceModem *self)
+{
+
+    /* If command is not implemented, report an error */
+    if (!MM_IFACE_MODEM_GET_INTERFACE (self)->command ||
+        !MM_IFACE_MODEM_GET_INTERFACE (self)->command_finish) {
+        g_dbus_method_invocation_return_error (invocation,
+                                               MM_CORE_ERROR,
+                                               MM_CORE_ERROR_UNSUPPORTED,
+                                               "Cannot send AT command to modem: "
+                                               "operation not supported");
+        return TRUE;
+    }
+
+    MM_IFACE_MODEM_GET_INTERFACE (self)->command (self,
+                                                  cmd,
+                                                  timeout,
+                                                  (GAsyncReadyCallback)command_done,
+                                                  dbus_call_context_new (skeleton,
+                                                                         invocation,
+                                                                         self));
+
+    return TRUE;
+}
+
 /*****************************************************************************/
 
 static gboolean
@@ -2920,6 +2972,10 @@ interface_initialization_step (InitializationContext *ctx)
                           "handle-create-bearer",
                           G_CALLBACK (handle_create_bearer),
                           ctx->self);
+        g_signal_connect (ctx->skeleton,
+                          "handle-command",
+                          G_CALLBACK (handle_command),
+                          ctx->self);
         g_signal_connect (ctx->skeleton,
                           "handle-delete-bearer",
                           G_CALLBACK (handle_delete_bearer),

src/mm-iface-modem.h

@@ -163,6 +163,16 @@ struct _MMIfaceModem {
                                       GAsyncResult *res,
                                       GError **error);
 
+    /* Asynchronous command operation */
+    void (*command) (MMIfaceModem *self,
+                     const gchar *cmd,
+                     guint timeout,
+                     GAsyncReadyCallback callback,
+                     gpointer user_data);
+    const gchar * (*command_finish) (MMIfaceModem *self,
+                                     GAsyncResult *res,
+                                     GError **error);
+
     /* Asynchronous allowed band setting operation */
     void (*set_allowed_bands) (MMIfaceModem *self,
                                GArray *bands_array,