plugin: let plugins decide if they want echo removal during AT probing

This is the port to git master of the following patch:

commit 21e66dfa1774ac2ee037ac8b6e8bb4d71a6f7931
Author: Dan Williams <dcbw@redhat.com>
Date:   Thu Aug 23 21:13:35 2012 -0500

    core: add function to open probe ports without removing echo

    Some devices (Sierra GSM ones) return stuff we need but don't
    bother to prefix it with <CR><LF>, so we need to optionally turn
    off the echo removal at probe time.

src/mm-plugin.c

@@ -69,6 +69,7 @@ struct _MMPluginPrivate {
     MMPortProbeAtCommand *custom_at_probe;
     MMAsyncMethod *custom_init;
     guint64 send_delay;
+    gboolean remove_echo;
 };
 
 enum {
@@ -93,6 +94,7 @@ enum {
     PROP_CUSTOM_AT_PROBE,
     PROP_CUSTOM_INIT,
     PROP_SEND_DELAY,
+    PROP_REMOVE_ECHO,
     LAST_PROP
 };
 
@@ -658,6 +660,7 @@ mm_plugin_supports_port (MMPlugin *self,
     mm_port_probe_run (probe,
                        ctx->flags,
                        self->priv->send_delay,
+                       self->priv->remove_echo,
                        self->priv->custom_at_probe,
                        self->priv->custom_init,
                        (GAsyncReadyCallback)port_probe_run_ready,
@@ -737,6 +740,7 @@ mm_plugin_init (MMPlugin *self)
 
     /* Defaults */
     self->priv->send_delay = 100000;
+    self->priv->remove_echo = TRUE;
 }
 
 static void
@@ -828,6 +832,10 @@ set_property (GObject *object,
         /* Construct only */
         self->priv->send_delay = (guint64)g_value_get_uint64 (value);
         break;
+    case PROP_REMOVE_ECHO:
+        /* Construct only */
+        self->priv->remove_echo = g_value_get_boolean (value);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -903,6 +911,9 @@ get_property (GObject *object,
     case PROP_SEND_DELAY:
         g_value_set_uint64 (value, self->priv->send_delay);
         break;
+    case PROP_REMOVE_ECHO:
+        g_value_set_boolean (value, self->priv->remove_echo);
+        break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -1104,4 +1115,12 @@ mm_plugin_class_init (MMPluginClass *klass)
                               "in microseconds",
                               0, G_MAXUINT64, 100000,
                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+
+    g_object_class_install_property
+        (object_class, PROP_REMOVE_ECHO,
+         g_param_spec_boolean (MM_PLUGIN_REMOVE_ECHO,
+                               "Remove echo",
+                               "Remove echo out of the AT responses",
+                               TRUE,
+                               G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
 }

src/mm-plugin.h

@@ -58,6 +58,7 @@
 #define MM_PLUGIN_CUSTOM_INIT               "custom-init"
 #define MM_PLUGIN_CUSTOM_AT_PROBE           "custom-at-probe"
 #define MM_PLUGIN_SEND_DELAY                "send-delay"
+#define MM_PLUGIN_REMOVE_ECHO               "remove-echo"
 
 typedef enum {
     MM_PLUGIN_SUPPORTS_PORT_UNSUPPORTED = 0x0,

src/mm-port-probe.c

@@ -78,6 +78,8 @@ typedef struct {
     GCancellable *at_probing_cancellable;
     /* Send delay for AT commands */
     guint64 at_send_delay;
+    /* Flag to leave/remove echo in AT responses */
+    gboolean at_remove_echo;
     /* Number of times we tried to open the AT port */
     guint at_open_tries;
     /* Custom initialization setup */
@@ -905,6 +907,7 @@ serial_open_at (MMPortProbe *self)
 
         g_object_set (task->serial,
                       MM_SERIAL_PORT_SEND_DELAY,     task->at_send_delay,
+                      MM_AT_SERIAL_PORT_REMOVE_ECHO, task->at_remove_echo,
                       MM_PORT_CARRIER_DETECT,        FALSE,
                       MM_SERIAL_PORT_SPEW_CONTROL,   TRUE,
                       NULL);
@@ -1025,6 +1028,7 @@ void
 mm_port_probe_run (MMPortProbe *self,
                    MMPortProbeFlag flags,
                    guint64 at_send_delay,
+                   gboolean at_remove_echo,
                    const MMPortProbeAtCommand *at_custom_probe,
                    const MMAsyncMethod *at_custom_init,
                    GAsyncReadyCallback callback,
@@ -1043,6 +1047,7 @@ mm_port_probe_run (MMPortProbe *self,
 
     task = g_new0 (PortProbeRunTask, 1);
     task->at_send_delay = at_send_delay;
+    task->at_remove_echo = at_remove_echo;
     task->flags = MM_PORT_PROBE_NONE;
     task->at_custom_probe = at_custom_probe;
     task->at_custom_init = at_custom_init ? (MMPortProbeAtCustomInit)at_custom_init->async : NULL;

src/mm-port-probe.h

@@ -103,6 +103,7 @@ void mm_port_probe_set_result_qmi        (MMPortProbe *self,
 void     mm_port_probe_run        (MMPortProbe *self,
                                    MMPortProbeFlag flags,
                                    guint64 at_send_delay,
+                                   gboolean at_remove_echo,
                                    const MMPortProbeAtCommand *at_custom_probe,
                                    const MMAsyncMethod *at_custom_init,
                                    GAsyncReadyCallback callback,