From ab027e9e9c92c3830359a54b5b9ef02711dbc88e Mon Sep 17 00:00:00 2001
From: Guillaume Zajac <guillaume.zajac@linux.intel.com>
Date: Fri, 20 May 2011 11:38:14 +0200
Subject: [PATCH] gatppp: Add GAtPPP suspend API

---
 gatchat/gatppp.c | 40 ++++++++++++++++++++++++++++++++++++++++
 gatchat/gatppp.h |  1 +
 2 files changed, 41 insertions(+)

diff --git a/gatchat/gatppp.c b/gatchat/gatppp.c
index 2608d52..2f97d55 100644
--- 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
--- 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);
-- 
2.7.4