1 files changed, 253 insertions, 0 deletions
diff --git a/src/low-can-binding.cpp b/src/low-can-binding.cpp
new file mode 100644
index 00000000..b6098907
--- /dev/null
+++ b/src/low-can-binding.cpp
@@ -0,0 +1,253 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ * Author "Loic Collignon" <loic.collignon@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/can.h>
+#include <linux/can/raw.h>
+#include <fcntl.h>
+#include <systemd/sd-event.h>
+#include <errno.h>
+#include <vector>
+#include <map>
+#include <queue>
+#include <string>
+#include <functional>
+#include <memory>
+#include <thread>
+
+#include <json-c/json.h>
+#include <openxc.pb.h>
+
+#include <afb/afb-binding.h>
+#include <afb/afb-service-itf.h>
+
+#include "ll-can-binding.h"
+#include "obd2.h"
+
+/*
+ *	 Interface between the daemon and the binding
+ */
+static const struct afb_binding_interface *interface;
+
+/********************************************************************************
+*
+*		Event management
+*
+*********************************************************************************/
+
+/*
+ * TBF TBF TBF
+ * called on an event on the CAN bus
+ */
+static int on_event(sd_event_source *s, int fd, uint32_t revents, void *userdata)
+{
+	openxc_CanMessage can_message;
+
+	can_message = openxc_CanMessage_init_default;
+
+	/* read available data */
+	if ((revents & EPOLLIN) != 0)
+	{
+		read_can(&can_message);
+		send_event();
+	}
+
+	/* check if error or hangup */
+	if ((revents & (EPOLLERR|EPOLLRDHUP|EPOLLHUP)) != 0)
+	{
+		sd_event_source_unref(s);
+		close(fd);
+		connect_to_event_loop();
+	}
+
+	return 0;
+}
+
+/*
+ * USELESS SINCE THREADS SEPARATION
+ *
+ * Get the event loop running.
+ * Will trigger on_event function on EPOLLIN event on socket
+ *
+ * Return 0 or positive value on success. Else negative value for failure.
+static int connect_to_event_loop(CanBus &CanBus_handler)
+{
+	sd_event *event_loop;
+	sd_event_source *source;
+	int rc;
+
+	if (CanBus_handler.socket < 0)
+	{
+		return CanBus_handler.socket;
+	}
+
+	event_loop = afb_daemon_get_event_loop(interface->daemon);
+	rc = sd_event_add_io(event_loop, &source, CanBus_handler.socket, EPOLLIN, on_event, NULL);
+	if (rc < 0)
+	{
+		CanBus_handler.close();
+		ERROR(interface, "Can't connect CAN bus %s to the event loop", CanBus_handler.device);
+	} else
+	{
+		NOTICE(interface, "Connected CAN bus %s to the event loop", CanBus_handler.device);
+	}
+
+	return rc;
+}
+ */
+
+/********************************************************************************
+*
+*		Subscription and unsubscription
+*
+*********************************************************************************/
+
+static int subscribe_unsubscribe_sig(struct afb_req request, int subscribe, struct signal *sig)
+{
+	if (!afb_event_is_valid(sig->event)) {
+		if (!subscribe)
+			return 1;
+		sig->event = afb_daemon_make_event(afbitf->daemon, sig->name);
+		if (!afb_event_is_valid(sig->event)) {
+			return 0;
+		}
+	}
+
+	if (((subscribe ? afb_req_subscribe : afb_req_unsubscribe)(request, sig->event)) < 0) {
+		return 0;
+	}
+
+	return 1;
+}
+
+static int subscribe_unsubscribe_all(struct afb_req request, int subscribe)
+{
+	int i, n, e;
+
+	n = sizeof OBD2_PIDS / sizeof * OBD2_PIDS;
+	e = 0;
+	for (i = 0 ; i < n ; i++)
+		e += !subscribe_unsubscribe_sig(request, subscribe, &OBD2_PIDS[i]);
+	return e == 0;
+}
+
+static int subscribe_unsubscribe_name(struct afb_req request, int subscribe, const char *name)
+{
+	struct signal *sig;
+
+	if (0 == strcmp(name, "*"))
+		return subscribe_unsubscribe_all(request, subscribe);
+
+	sig = getSignal(name);
+	if (sig == NULL) {
+		return 0;
+	}
+
+	return subscribe_unsubscribe_sig(request, subscribe, sig);
+}
+
+static void subscribe_unsubscribe(struct afb_req request, int subscribe)
+{
+	int ok, i, n;
+	struct json_object *args, *a, *x;
+
+	/* makes the subscription/unsubscription */
+	args = afb_req_json(request);
+	if (args == NULL || !json_object_object_get_ex(args, "event", &a)) {
+		ok = subscribe_unsubscribe_all(request, subscribe);
+	} else if (json_object_get_type(a) != json_type_array) {
+		ok = subscribe_unsubscribe_name(request, subscribe, json_object_get_string(a));
+	} else {
+		n = json_object_array_length(a);
+		ok = 0;
+		for (i = 0 ; i < n ; i++) {
+			x = json_object_array_get_idx(a, i);
+			if (subscribe_unsubscribe_name(request, subscribe, json_object_get_string(x)))
+				ok++;
+		}
+		ok = (ok == n);
+	}
+
+	/* send the report */
+	if (ok)
+		afb_req_success(request, NULL, NULL);
+	else
+		afb_req_fail(request, "error", NULL);
+}
+
+static void subscribe(struct afb_req request)
+{
+	subscribe_unsubscribe(request, 1);
+}
+
+static void unsubscribe(struct afb_req request)
+{
+	subscribe_unsubscribe(request, 0);
+}
+static const struct afb_verb_desc_v1 verbs[]=
+{
+  { .name= "subscribe",    .session= AFB_SESSION_NONE, .callback= subscribe,	.info= "subscribe to notification of CAN bus messages." },
+  { .name= "unsubscribe",  .session= AFB_SESSION_NONE, .callback= unsubscribe,	.info= "unsubscribe a previous subscription." },
+	{NULL}
+};
+
+static const struct afb_binding binding_desc = {
+	.type = AFB_BINDING_VERSION_1,
+	.v1 = {
+		.info = "CAN bus service",
+		.prefix = "can",
+		.verbs = verbs
+	}
+};
+
+const struct afb_binding *afbBindingV1Register (const struct afb_binding_interface *itf)
+{
+	interface = itf;
+
+	return &binding_desc;
+}
+
+int afbBindingV1ServiceInit(struct afb_service service)
+{
+	std::ifstream fd_conf;
+	std::string fd_conf_content;
+	json_object jo_canbus;
+
+	/* Open JSON conf file */
+	jo_canbus = json_object_new_object();
+	fd_conf = afb_daemon_rootdir_open_locale(interface->daemon, "canbus.json", O_RDONLY, NULL);
+	if (fd_conf)
+	{
+		fd_conf.seekg(0, std::ios::end);
+		fd_conf_content.resize(fd_conf.tellg());
+		fd_conf.seekg(0, std::ios::beg);
+		fd_conf.read(&fd_conf_content[0], fd_conf_content.size());
+		fd_conf.close();
+	}
+
+	jo_canbus = json_tokener_parse(&fd_conf_content);
+
+	/* Open CAN socket */
+	CanBus_c CanBus_handler(interface, json_object_get_string(json_object_object_get(jo_canbus, "deviceName"));
+	CanBus_handler.open();
+	CanBus_handler.start_threads();
+}