huaweimodem: Add support for USSD 8-bit PDU mode

The Huawei devices support a special 8-bit PDU mode for USSD that is
by default selected (AT^USSDMODE=1). It avoids the complicated logic
for character set selection and conversion.

3 files changed, 220 insertions, 0 deletions

diff --git a/drivers/huaweimodem/huaweimodem.c b/drivers/huaweimodem/huaweimodem.c
index ac084c2d..7fd72fbc 100644
--- a/drivers/huaweimodem/huaweimodem.c
+++ b/drivers/huaweimodem/huaweimodem.c
@@ -34,6 +34,7 @@
 
 static int huaweimodem_init(void)
 {
+	huawei_ussd_init();
 	huawei_voicecall_init();
 	huawei_audio_settings_init();
 	huawei_radio_settings_init();
@@ -52,6 +53,7 @@ static void huaweimodem_exit(void)
 	huawei_radio_settings_exit();
 	huawei_audio_settings_exit();
 	huawei_voicecall_exit();
+	huawei_ussd_exit();
 }
 
 OFONO_PLUGIN_DEFINE(huaweimodem, "Huawei modem driver", VERSION,
diff --git a/drivers/huaweimodem/huaweimodem.h b/drivers/huaweimodem/huaweimodem.h
index 31ab9f96..00c1fa4c 100644
--- a/drivers/huaweimodem/huaweimodem.h
+++ b/drivers/huaweimodem/huaweimodem.h
@@ -21,6 +21,9 @@
 
 #include <drivers/atmodem/atutil.h>
 
+extern void huawei_ussd_init(void);
+extern void huawei_ussd_exit(void);
+
 extern void huawei_voicecall_init(void);
 extern void huawei_voicecall_exit(void);
 
diff --git a/drivers/huaweimodem/ussd.c b/drivers/huaweimodem/ussd.c
new file mode 100644
index 00000000..490aeb7a
--- /dev/null
+++ b/drivers/huaweimodem/ussd.c
@@ -0,0 +1,215 @@
+/*
+ *
+ *  oFono - Open Source Telephony
+ *
+ *  Copyright (C) 2008-2011  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 <errno.h>
+
+#include <glib.h>
+
+#include <ofono/log.h>
+#include <ofono/modem.h>
+#include <ofono/ussd.h>
+#include "util.h"
+
+#include "gatchat.h"
+#include "gatresult.h"
+
+#include "huaweimodem.h"
+
+static const char *cusd_prefix[] = { "+CUSD:", NULL };
+static const char *none_prefix[] = { NULL };
+
+struct ussd_data {
+	GAtChat *chat;
+};
+
+static void cusd_parse(GAtResult *result, struct ofono_ussd *ussd)
+{
+	GAtResultIter iter;
+	int status, dcs;
+	const char *content;
+	unsigned char msg[160];
+	const unsigned char *msg_ptr = NULL;
+	long msg_len;
+
+	g_at_result_iter_init(&iter, result);
+
+	if (!g_at_result_iter_next(&iter, "+CUSD:"))
+		return;
+
+	if (!g_at_result_iter_next_number(&iter, &status))
+		return;
+
+	if (!g_at_result_iter_next_string(&iter, &content))
+		goto out;
+
+	if (!g_at_result_iter_next_number(&iter, &dcs))
+		dcs = 0;
+
+	msg_ptr = decode_hex_own_buf(content, -1, &msg_len, 0, msg);
+
+out:
+	ofono_ussd_notify(ussd, status, dcs, msg_ptr, msg_ptr ? msg_len : 0);
+}
+
+static void cusd_request_cb(gboolean ok, GAtResult *result, gpointer user_data)
+{
+	struct cb_data *cbd = user_data;
+	ofono_ussd_cb_t cb = cbd->cb;
+	struct ofono_ussd *ussd = cbd->user;
+	struct ofono_error error;
+
+	decode_at_error(&error, g_at_result_final_response(result));
+
+	cb(&error, cbd->data);
+
+	cusd_parse(result, ussd);
+}
+
+static void huawei_ussd_request(struct ofono_ussd *ussd, int dcs,
+				const unsigned char *pdu, int len,
+				ofono_ussd_cb_t cb, void *user_data)
+{
+	struct ussd_data *data = ofono_ussd_get_data(ussd);
+	struct cb_data *cbd = cb_data_new(cb, user_data);
+	char buf[512], coded_buf[321];
+	char *converted;
+
+	cbd->user = ussd;
+
+	converted = encode_hex_own_buf(pdu, len, 0, coded_buf);
+	if (converted == NULL)
+		goto error;
+
+	snprintf(buf, sizeof(buf), "AT+CUSD=1,\"%s\",%d", converted, dcs);
+
+	if (g_at_chat_send(data->chat, buf, cusd_prefix,
+				cusd_request_cb, cbd, g_free) > 0)
+		return;
+
+error:
+	g_free(cbd);
+
+	CALLBACK_WITH_FAILURE(cb, user_data);
+}
+
+static void cusd_cancel_cb(gboolean ok, GAtResult *result, gpointer user_data)
+{
+	struct cb_data *cbd = user_data;
+	ofono_ussd_cb_t cb = cbd->cb;
+	struct ofono_error error;
+
+	decode_at_error(&error, g_at_result_final_response(result));
+
+	cb(&error, cbd->data);
+}
+
+static void huawei_ussd_cancel(struct ofono_ussd *ussd,
+				ofono_ussd_cb_t cb, void *user_data)
+{
+	struct ussd_data *data = ofono_ussd_get_data(ussd);
+	struct cb_data *cbd = cb_data_new(cb, user_data);
+
+	cbd->user = data;
+
+	if (g_at_chat_send(data->chat, "AT+CUSD=2", none_prefix,
+				cusd_cancel_cb, cbd, g_free) > 0)
+		return;
+
+	g_free(cbd);
+
+	CALLBACK_WITH_FAILURE(cb, user_data);
+}
+
+static void cusd_notify(GAtResult *result, gpointer user_data)
+{
+	struct ofono_ussd *ussd = user_data;
+
+	cusd_parse(result, ussd);
+}
+
+static void cusd_register(gboolean ok, GAtResult *result, gpointer user_data)
+{
+	struct ofono_ussd *ussd = user_data;
+	struct ussd_data *data = ofono_ussd_get_data(ussd);
+
+	if (!ok) {
+		ofono_error("Could not enable CUSD notifications");
+		return;
+	}
+
+	g_at_chat_register(data->chat, "+CUSD:", cusd_notify,
+						FALSE, ussd, NULL);
+
+	ofono_ussd_register(ussd);
+}
+
+static int huawei_ussd_probe(struct ofono_ussd *ussd,
+					unsigned int vendor, void *user)
+{
+	GAtChat *chat = user;
+	struct ussd_data *data;
+
+	data = g_try_new0(struct ussd_data, 1);
+	if (data == NULL)
+		return -ENOMEM;
+
+	data->chat = g_at_chat_clone(chat);
+
+	ofono_ussd_set_data(ussd, data);
+
+	g_at_chat_send(data->chat, "AT+CUSD=1", none_prefix,
+					cusd_register, ussd, NULL);
+
+	return 0;
+}
+
+static void huawei_ussd_remove(struct ofono_ussd *ussd)
+{
+	struct ussd_data *data = ofono_ussd_get_data(ussd);
+
+	ofono_ussd_set_data(ussd, NULL);
+
+	g_at_chat_unref(data->chat);
+	g_free(data);
+}
+
+static struct ofono_ussd_driver driver = {
+	.name		= "huaweimodem",
+	.probe		= huawei_ussd_probe,
+	.remove		= huawei_ussd_remove,
+	.request	= huawei_ussd_request,
+	.cancel		= huawei_ussd_cancel,
+};
+
+void huawei_ussd_init(void)
+{
+	ofono_ussd_driver_register(&driver);
+}
+
+void huawei_ussd_exit(void)
+{
+	ofono_ussd_driver_unregister(&driver);
+}