iface-modem: allow plugins to send custom commands after power-up

Just after powering up the modem, plugins can run additional setup commands
themselves, in a new "after" power-up step.

src/mm-iface-modem.c

@@ -755,6 +755,7 @@ typedef enum {
     ENABLING_STEP_FLASH_PORT,
     ENABLING_STEP_MODEM_INIT,
     ENABLING_STEP_MODEM_POWER_UP,
+    ENABLING_STEP_MODEM_AFTER_POWER_UP,
     ENABLING_STEP_LAST
 } EnablingStep;
 
@@ -854,6 +855,7 @@ mm_iface_modem_enable_finish (MMIfaceModem *self,
 
 VOID_REPLY_READY_FN (modem_init);
 VOID_REPLY_READY_FN (modem_power_up);
+VOID_REPLY_READY_FN (modem_after_power_up);
 
 static void
 interface_enabling_flash_done (MMSerialPort *port,
@@ -928,6 +930,18 @@ interface_enabling_step (EnablingContext *ctx)
         /* Fall down to next step */
         ctx->step++;
 
+    case ENABLING_STEP_MODEM_AFTER_POWER_UP:
+        if (MM_IFACE_MODEM_GET_INTERFACE (ctx->self)->modem_after_power_up &&
+            MM_IFACE_MODEM_GET_INTERFACE (ctx->self)->modem_after_power_up_finish) {
+            MM_IFACE_MODEM_GET_INTERFACE (ctx->self)->modem_after_power_up (
+                ctx->self,
+                (GAsyncReadyCallback)modem_after_power_up_ready,
+                ctx);
+            return;
+        }
+        /* Fall down to next step */
+        ctx->step++;
+
     case ENABLING_STEP_LAST:
         /* We are done without errors! */
         g_simple_async_result_set_op_res_gboolean (ctx->result, TRUE);

src/mm-iface-modem.h

@@ -198,6 +198,15 @@ struct _MMIfaceModem {
     gboolean (*modem_power_up_finish) (MMIfaceModem *self,
                                        GAsyncResult *res,
                                        GError **error);
+
+    /* Asynchronous additional setup needed after power-up,
+     * Plugins can implement this to provide custom setups. */
+    void (*modem_after_power_up) (MMIfaceModem *self,
+                                  GAsyncReadyCallback callback,
+                                  gpointer user_data);
+    gboolean (*modem_after_power_up_finish) (MMIfaceModem *self,
+                                             GAsyncResult *res,
+                                             GError **error);
 };
 
 GType mm_iface_modem_get_type (void);