gatppp: Add GAtPPP suspend API

diff --git a/gatchat/gatppp.c b/gatchat/gatppp.c
index 2608d52..2f97d55 100644 (file)
--- a/gatchat/gatppp.c
+++ b/gatchat/gatppp.c
@@ -46,6 +46,8 @@
 #define PPP_ADDR_FIELD 0xff
 #define PPP_CTRL       0x03
 
+#define GUARD_TIMEOUTS 1500
+
 enum ppp_phase {
        PPP_PHASE_DEAD = 0,             /* Link dead */
        PPP_PHASE_ESTABLISHMENT,        /* LCP started */
@@ -79,6 +81,7 @@ struct _GAtPPP {
        GAtSuspendFunc suspend_func;
        gpointer suspend_data;
        int fd;
+       guint guard_timeout_src;
        gboolean suspended;
 };
 
@@ -509,6 +512,43 @@ void g_at_ppp_shutdown(GAtPPP *ppp)
        pppcp_signal_close(ppp->lcp);
 }
 
+static gboolean call_suspend_cb(gpointer user_data)
+{
+       GAtPPP *ppp = user_data;
+
+       ppp->guard_timeout_src = 0;
+
+       if (ppp->suspend_func)
+               ppp->suspend_func(ppp->suspend_data);
+
+       return FALSE;
+}
+
+static gboolean send_escape_sequence(gpointer user_data)
+{
+       GAtPPP *ppp = user_data;
+       GAtIO *io = g_at_hdlc_get_io(ppp->hdlc);
+
+       ppp->guard_timeout_src = 0;
+       g_at_io_write(io, "+++", 3);
+       ppp->guard_timeout_src  = g_timeout_add(GUARD_TIMEOUTS,
+                                               call_suspend_cb, ppp);
+
+       return FALSE;
+}
+
+void g_at_ppp_suspend(GAtPPP *ppp)
+{
+       if (ppp == NULL)
+               return;
+
+       ppp->suspended = TRUE;
+       ppp_net_suspend_interface(ppp->net);
+       g_at_hdlc_suspend(ppp->hdlc);
+       ppp->guard_timeout_src = g_timeout_add(GUARD_TIMEOUTS,
+                                               send_escape_sequence, ppp);
+}
+
 void g_at_ppp_resume(GAtPPP *ppp)
 {
        if (ppp == NULL)

diff --git a/gatchat/gatppp.h b/gatchat/gatppp.h
index b1b0234..4a27fea 100644 (file)
--- a/gatchat/gatppp.h
+++ b/gatchat/gatppp.h
@@ -65,6 +65,7 @@ void g_at_ppp_set_suspend_function(GAtPPP *ppp, GAtSuspendFunc func,
                                        gpointer user_data);
 void g_at_ppp_set_debug(GAtPPP *ppp, GAtDebugFunc func, gpointer user_data);
 void g_at_ppp_shutdown(GAtPPP *ppp);
+void g_at_ppp_suspend(GAtPPP *ppp);
 void g_at_ppp_resume(GAtPPP *ppp);
 void g_at_ppp_ref(GAtPPP *ppp);
 void g_at_ppp_unref(GAtPPP *ppp);