Add skeleton for AT multiplexer API

Makefile.am

@@ -42,7 +42,8 @@ gisi_sources = gisi/phonet.h gisi/modem.h gisi/netlink.h gisi/netlink.c \
 		gisi/socket.h gisi/socket.c gisi/client.h gisi/client.c \
 		gisi/pep.h gisi/pep.c gisi/pipe.h gisi/pipe.c
 
-gatmux_sources = gatmux/gsm0710_p.h gatmux/gsm0710.c
+gatmux_sources = gatmux/gatmux.h gatmux/gatmux.c \
+				gatmux/gsm0710_p.h gatmux/gsm0710.c
 
 gatchat_sources = gatchat/gatchat.h gatchat/gatchat.c \
 				gatchat/gatresult.h gatchat/gatresult.c \

gatmux/gatmux.c

@@ -0,0 +1,127 @@
+/*
+ *
+ *  AT multiplexer library with GLib integration
+ *
+ *  Copyright (C) 2009  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <termios.h>
+
+#include <glib.h>
+
+#include "gsm0710_p.h"
+#include "gatmux.h"
+
+struct _GAtMux {
+	gint ref_count;		/* Ref count */
+	GIOChannel *channel;	/* channel */
+};
+
+GAtMux *g_at_mux_new(GIOChannel *channel)
+{
+	GAtMux *mux;
+
+	if (!channel)
+		return NULL;
+
+	mux = g_try_new0(GAtMux, 1);
+
+	if (!mux)
+		return mux;
+
+	mux->ref_count = 1;
+
+	mux->channel = channel;
+
+	return mux;
+}
+
+static int open_device(const char *device)
+{
+	struct termios ti;
+	int fd;
+
+	fd = open(device, O_RDWR | O_NOCTTY);
+	if (fd < 0)
+		return -1;
+
+	tcflush(fd, TCIOFLUSH);
+
+	/* Switch TTY to raw mode */
+	memset(&ti, 0, sizeof(ti));
+	cfmakeraw(&ti);
+
+	tcsetattr(fd, TCSANOW, &ti);
+
+	return fd;
+}
+
+GAtMux *g_at_mux_new_from_tty(const char *device)
+{
+	GIOChannel *channel;
+	int fd;
+
+	fd = open_device(device);
+	if (fd < 0)
+		return NULL;
+
+	channel = g_io_channel_unix_new(fd);
+	if (!channel) {
+		close(fd);
+		return NULL;
+	}
+
+	return g_at_mux_new(channel);
+}
+
+GAtMux *g_at_mux_ref(GAtMux *mux)
+{
+	if (mux == NULL)
+		return NULL;
+
+	g_atomic_int_inc(&mux->ref_count);
+
+	return mux;
+}
+
+void g_at_mux_unref(GAtMux *mux)
+{
+	if (mux == NULL)
+		return;
+
+	if (g_atomic_int_dec_and_test(&mux->ref_count)) {
+		g_at_mux_shutdown(mux);
+
+		g_free(mux);
+	}
+}
+
+gboolean g_at_mux_shutdown(GAtMux *mux)
+{
+	if (mux->channel == NULL)
+		return FALSE;
+
+	return TRUE;
+}

gatmux/gatmux.h

@@ -0,0 +1,45 @@
+/*
+ *
+ *  AT multiplexer library with GLib integration
+ *
+ *  Copyright (C) 2009  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __GATMUX_H
+#define __GATMUX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct _GAtMux;
+
+typedef struct _GAtMux GAtMux;
+
+GAtMux *g_at_mux_new(GIOChannel *channel);
+GAtMux *g_at_mux_new_from_tty(const char *device);
+
+GAtMux *g_at_mux_ref(GAtMux *mux);
+void g_at_mux_unref(GAtMux *mux);
+
+gboolean g_at_mux_shutdown(GAtMux *mux);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __GATMUX_H */