[PATCH 3/9] lte: add implementation for LTE atom

[Dragos Tatulea <dragos@endocode.com>]

[-- Attachment #1: Type: text/plain, Size: 10144 bytes --]

This implementation can only get/set the default APN setting. But
anything expected for this atom is there:
* D-Bus interface
* sync-ing settings to/from file
* interaction with driver
---
 src/lte.c | 369 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 369 insertions(+)
 create mode 100644 src/lte.c

diff --git a/src/lte.c b/src/lte.c
new file mode 100644
index 0000000..ba22dc2
--- /dev/null
+++ b/src/lte.c
@@ -0,0 +1,369 @@
+/*
+ *
+ *  oFono - Open Source Telephony
+ *
+ *  Copyright (C) 2016  Endocode AG. 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 <string.h>
+#include <errno.h>
+
+#include <glib.h>
+#include <gdbus.h>
+
+#include "ofono.h"
+
+#include "common.h"
+#include "log.h"
+#include "gprs-context.h"
+#include "storage.h"
+
+#include "lte.h"
+
+#define SETTINGS_STORE "lte"
+#define SETTINGS_GROUP "Settings"
+#define DEFAULT_APN_KEY "DefaultAccessPointName"
+
+struct ofono_lte {
+	const struct ofono_lte_driver *driver;
+	void *driver_data;
+	struct ofono_atom *atom;
+	char *imsi;
+	GKeyFile *settings;
+	DBusMessage *pending;
+	char old_apn[OFONO_GPRS_MAX_APN_LENGTH+1];
+	struct ofono_lte_default_attach_info info;
+};
+
+static GSList *g_drivers = NULL;
+
+static void lte_load_settings(struct ofono_lte *lte)
+{
+	char *apn;
+
+	if (lte->imsi == NULL)
+		return;
+
+	lte->settings = storage_open(lte->imsi, SETTINGS_STORE);
+
+	if (lte->settings == NULL) {
+		ofono_error("LTE: Can't open settings file, "
+				"changes won't be persistent");
+		return;
+	}
+
+	apn = g_key_file_get_string(lte->settings, SETTINGS_GROUP ,
+					DEFAULT_APN_KEY, NULL);
+	if (apn)
+		strcpy(lte->info.apn, apn);
+}
+
+static DBusMessage *lte_get_properties(DBusConnection *conn,
+					DBusMessage *msg, void *data)
+{
+	struct ofono_lte *lte = data;
+	const char *apn = lte->info.apn;
+	DBusMessage *reply;
+	DBusMessageIter iter;
+	DBusMessageIter dict;
+
+	reply = dbus_message_new_method_return(msg);
+	if (reply == NULL)
+		return NULL;
+
+	dbus_message_iter_init_append(reply, &iter);
+
+	dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY,
+					OFONO_PROPERTIES_ARRAY_SIGNATURE,
+					&dict);
+	ofono_dbus_dict_append(&dict, DEFAULT_APN_KEY, DBUS_TYPE_STRING, &apn);
+	dbus_message_iter_close_container(&iter, &dict);
+
+	return reply;
+}
+
+static void lte_set_default_attach_info_cb(const struct ofono_error *error,
+						void *data)
+{
+	struct ofono_lte *lte = data;
+	const char *path = __ofono_atom_get_path(lte->atom);
+	DBusConnection *conn = ofono_dbus_get_connection();
+	DBusMessage *reply;
+	const char *apn = lte->info.apn;
+
+	DBG("%s error %d", path, error->type);
+
+	if (error->type != OFONO_ERROR_TYPE_NO_ERROR) {
+		g_strlcpy(lte->info.apn, lte->old_apn,
+				OFONO_GPRS_MAX_APN_LENGTH+1);
+
+		__ofono_dbus_pending_reply(&lte->pending,
+				__ofono_error_failed(lte->pending));
+		return;
+	}
+
+	if (lte->pending == NULL)
+		/* This can happen on first register: it's not a reply to
+		 * anything.
+		 */
+		return;
+
+	if (lte->settings) {
+		if (strlen(lte->info.apn) == 0)
+			/* Clear entry on empty APN. */
+			g_key_file_remove_key(lte->settings, SETTINGS_GROUP,
+						DEFAULT_APN_KEY, NULL);
+		else
+			g_key_file_set_string(lte->settings, SETTINGS_GROUP,
+						DEFAULT_APN_KEY, lte->info.apn);
+
+		storage_sync(lte->imsi, SETTINGS_STORE, lte->settings);
+	}
+
+	reply = dbus_message_new_method_return(lte->pending);
+	__ofono_dbus_pending_reply(&lte->pending, reply);
+	lte->pending = NULL;
+
+	ofono_dbus_signal_property_changed(conn, path,
+					OFONO_CONNECTION_CONTEXT_INTERFACE,
+					DEFAULT_APN_KEY,
+					DBUS_TYPE_STRING, &apn);
+}
+
+static DBusMessage *lte_set_default_apn(struct ofono_lte *lte,
+				DBusConnection *conn, DBusMessage *msg,
+				const char *apn)
+{
+	if (strlen(apn) > OFONO_GPRS_MAX_APN_LENGTH)
+		return __ofono_error_invalid_format(msg);
+
+	if (g_str_equal(apn, lte->info.apn))
+		return dbus_message_new_method_return(msg);
+
+	/* We do care about empty value: it can be used for reset. */
+	if (is_valid_apn(apn) == FALSE && apn[0] != '\0')
+		return __ofono_error_invalid_format(msg);
+
+	if (lte->pending) {
+		/* Can happen on fast succession of calls. */
+		dbus_message_unref(lte->pending);
+		lte->pending = NULL;
+	}
+
+	lte->pending = dbus_message_ref(msg);
+
+	g_strlcpy(lte->old_apn, lte->info.apn, OFONO_GPRS_MAX_APN_LENGTH+1);
+	g_strlcpy(lte->info.apn, apn, OFONO_GPRS_MAX_APN_LENGTH+1);
+
+	lte->driver->set_default_attach_info(lte, &lte->info,
+				lte_set_default_attach_info_cb, lte);
+
+	return NULL;
+}
+
+static DBusMessage *lte_set_property(DBusConnection *conn,
+					DBusMessage *msg, void *data)
+{
+	struct ofono_lte *lte = data;
+	DBusMessageIter iter;
+	DBusMessageIter var;
+	const char *property;
+	const char *str;
+
+	if (!dbus_message_iter_init(msg, &iter))
+		return __ofono_error_invalid_args(msg);
+
+	if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
+		return __ofono_error_invalid_args(msg);
+
+	dbus_message_iter_get_basic(&iter, &property);
+	dbus_message_iter_next(&iter);
+
+	if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)
+		return __ofono_error_invalid_args(msg);
+
+	dbus_message_iter_recurse(&iter, &var);
+
+
+	if (!strcmp(property, DEFAULT_APN_KEY)) {
+		if (dbus_message_iter_get_arg_type(&var) != DBUS_TYPE_STRING)
+			return __ofono_error_invalid_args(msg);
+
+		dbus_message_iter_get_basic(&var, &str);
+
+		return lte_set_default_apn(lte, conn, msg, str);
+	}
+
+	return __ofono_error_invalid_args(msg);
+}
+
+static const GDBusMethodTable lte_methods[] = {
+	{ GDBUS_METHOD("GetProperties",
+			NULL, GDBUS_ARGS({ "properties", "a{sv}" }),
+			lte_get_properties) },
+	{ GDBUS_ASYNC_METHOD("SetProperty",
+			GDBUS_ARGS({ "property", "s" }, { "value", "v" }),
+			NULL, lte_set_property) },
+	{ }
+};
+
+static const GDBusSignalTable lte_signals[] = {
+	{ GDBUS_SIGNAL("PropertyChanged",
+			GDBUS_ARGS({ "name", "s" }, { "value", "v" })) },
+	{ }
+};
+
+static void lte_atom_remove(struct ofono_atom *atom)
+{
+	struct ofono_lte *lte = __ofono_atom_get_data(atom);
+
+	DBG("atom: %p", atom);
+
+	if (lte == NULL)
+		return;
+
+	if (lte->settings) {
+		storage_close(lte->imsi, SETTINGS_STORE, lte->settings, TRUE);
+
+		g_free(lte->imsi);
+		lte->imsi = NULL;
+		lte->settings = NULL;
+	}
+
+	if (lte->driver && lte->driver->remove)
+		lte->driver->remove(lte);
+
+	g_free(lte);
+}
+
+
+struct ofono_lte *ofono_lte_create(struct ofono_modem *modem,
+					const char *driver, void *data)
+{
+	struct ofono_lte *lte;
+	GSList *l;
+
+	if (driver == NULL)
+		return NULL;
+
+	lte = g_try_new0(struct ofono_lte, 1);
+
+	if (lte == NULL)
+		return NULL;
+
+	lte->atom = __ofono_modem_add_atom(modem, OFONO_ATOM_TYPE_LTE,
+						lte_atom_remove, lte);
+
+	for (l = g_drivers; l; l = l->next) {
+		const struct ofono_lte_driver *drv = l->data;
+
+		if (g_strcmp0(drv->name, driver))
+			continue;
+
+		if (drv->probe(lte, data) < 0)
+			continue;
+
+		lte->driver = drv;
+		break;
+	}
+
+	DBG("LTE atom created");
+
+	return lte;
+}
+
+int ofono_lte_driver_register(const struct ofono_lte_driver *d)
+{
+	DBG("driver: %p, name: %s", d, d->name);
+
+	if (d->probe == NULL)
+		return -EINVAL;
+
+	g_drivers = g_slist_prepend(g_drivers, (void *) d);
+
+	return 0;
+}
+
+void ofono_lte_driver_unregister(const struct ofono_lte_driver *d)
+{
+	DBG("driver: %p, name: %s", d, d->name);
+
+	g_drivers = g_slist_remove(g_drivers, (void *) d);
+}
+
+static void lte_atom_unregister(struct ofono_atom *atom)
+{
+	DBusConnection *conn = ofono_dbus_get_connection();
+	struct ofono_modem *modem = __ofono_atom_get_modem(atom);
+	const char *path = __ofono_atom_get_path(atom);
+
+	ofono_modem_remove_interface(modem, OFONO_LTE_INTERFACE);
+	g_dbus_unregister_interface(conn, path, OFONO_LTE_INTERFACE);
+}
+
+void ofono_lte_register(struct ofono_lte *lte)
+{
+	DBusConnection *conn = ofono_dbus_get_connection();
+	struct ofono_modem *modem = __ofono_atom_get_modem(lte->atom);
+	const char *path = __ofono_atom_get_path(lte->atom);
+	struct ofono_sim *sim = __ofono_atom_find(OFONO_ATOM_TYPE_SIM, modem);
+	const char *imsi = ofono_sim_get_imsi(sim);
+
+	if (imsi == NULL) {
+		ofono_error("No sim atom required for registering LTE atom.");	
+		return;
+	}
+
+	lte->imsi = g_strdup(imsi);
+
+	lte_load_settings(lte);
+
+	if (!g_dbus_register_interface(conn, path,
+				OFONO_LTE_INTERFACE,
+				lte_methods, lte_signals, NULL,
+				lte, NULL)) {
+		ofono_error("Could not create %s interface",
+				OFONO_LTE_INTERFACE);
+		return;
+	}
+
+	ofono_modem_add_interface(modem, OFONO_LTE_INTERFACE);
+
+	__ofono_atom_register(lte->atom, lte_atom_unregister);
+
+	lte->driver->set_default_attach_info(lte, &lte->info,
+					lte_set_default_attach_info_cb, lte);
+}
+
+void ofono_lte_remove(struct ofono_lte *lte)
+{
+	__ofono_atom_free(lte->atom);
+}
+
+void ofono_lte_set_data(struct ofono_lte *lte, void *data)
+{
+	lte->driver_data = data;
+}
+
+void *ofono_lte_get_data(const struct ofono_lte *lte)
+{
+	return lte->driver_data;
+}
-- 
2.7.4