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/*
* Copyright (C) 2018 Konsulko Group
* Author: Matt Ranostay <matt.ranostay@konsulko.com>
*
* 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.
*
* TODO: add support for NFC p2p transactions
*/
#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <pthread.h>
#include <glib.h>
#include <glib-object.h>
#include <json-c/json.h>
#include <neardal/neardal.h>
#define AFB_BINDING_VERSION 3
#include <afb/afb-binding.h>
#include "afm-nfc-common.h"
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static afb_event_t presence_event;
static void neard_cb_record_found(const char *tag_name, void *ptr)
{
nfc_binding_data *data = ptr;
neardal_record *record;
int ret = neardal_get_record_properties(tag_name, &record);
if (ret == NEARDAL_SUCCESS) {
GVariantIter iter;
char *s = NULL;
GVariant *v, *value = (neardal_record_to_g_variant(record));
json_object *jresp = json_object_new_object();
json_object *jdict = json_object_new_object();
g_variant_iter_init(&iter, value);
json_object_object_add(jresp, "status",
json_object_new_string("detected"));
while (g_variant_iter_loop(&iter, "{sv}", &s, &v)) {
gchar *str;
if (g_strcmp0("Name", s) == 0)
continue;
str = g_variant_print(v, 0);
str[strlen(str) - 1] = '\0';
json_object_object_add(jdict, s,
json_object_new_string(str + 1));
g_free(str);
}
json_object_object_add(jresp, "record", jdict);
neardal_free_record(record);
pthread_mutex_lock(&mutex);
data->jresp = jresp;
json_object_get(jresp);
pthread_mutex_unlock(&mutex);
afb_event_push(presence_event, jresp);
}
}
static void neard_cb_tag_removed(const char *tag_name, void *ptr)
{
nfc_binding_data *data = ptr;
json_object *jresp = json_object_new_object();
pthread_mutex_lock(&mutex);
if (data->jresp) {
json_object_put(data->jresp);
data->jresp = NULL;
}
pthread_mutex_unlock(&mutex);
json_object_object_add(jresp, "status",
json_object_new_string("removed"));
afb_event_push(presence_event, jresp);
g_main_loop_quit(data->loop);
}
static void *poll_adapter(void *ptr)
{
nfc_binding_data *data = ptr;
int ret;
data->loop = g_main_loop_new(NULL, FALSE);
neardal_set_cb_tag_lost(neard_cb_tag_removed, ptr);
neardal_set_cb_record_found(neard_cb_record_found, ptr);
ret = neardal_set_adapter_property(data->adapter,
NEARD_ADP_PROP_POWERED,
GINT_TO_POINTER(1));
if (ret != NEARDAL_SUCCESS) {
AFB_API_DEBUG(afbBindingV3root,
"failed to power %s adapter on: ret=0x%x (%s)",
data->adapter, ret, neardal_error_get_text(ret));
g_free(data->adapter);
return NULL;
}
while (1) {
ret = neardal_start_poll(data->adapter);
if ((ret != NEARDAL_SUCCESS) &&
(ret != NEARDAL_ERROR_POLLING_ALREADY_ACTIVE))
break;
g_main_loop_run(data->loop);
}
g_free(data->adapter);
return NULL;
}
static int get_adapter(nfc_binding_data *data, unsigned int id)
{
char **adapters = NULL;
int num_adapters, ret;
ret = neardal_get_adapters(&adapters, &num_adapters);
if (ret != NEARDAL_SUCCESS) {
AFB_API_DEBUG(afbBindingV3root,
"failed to find adapters ret=0x%x (%s)",
ret, neardal_error_get_text(ret));
return -EIO;
}
if (id > num_adapters - 1) {
AFB_API_DEBUG(afbBindingV3root,
"adapter out of range (%d - %d)",
id, num_adapters);
return -EINVAL;
}
data->adapter = g_strdup(adapters[id]);
neardal_free_array(&adapters);
return ret;
}
static int init(afb_api_t api)
{
nfc_binding_data *data;
pthread_t thread_id;
int ret;
data = malloc(sizeof(nfc_binding_data));
if (data == NULL)
return -ENOMEM;
presence_event = afb_api_make_event(api, "presence");
if (!afb_event_is_valid(presence_event)) {
AFB_API_ERROR(api, "Failed to create event");
return -EINVAL;
}
/* get the first adapter */
ret = get_adapter(data, 0);
if (ret != NEARDAL_SUCCESS)
return 0;
AFB_API_DEBUG(api, " %s adapter found", data->adapter);
afb_api_set_userdata(api, data);
ret = pthread_create(&thread_id, NULL, poll_adapter, data);
if (ret)
AFB_API_ERROR(api, "polling pthread creation failed");
return 0;
}
static void subscribe(afb_req_t request)
{
if (afb_req_subscribe(request, presence_event) < 0) {
AFB_REQ_ERROR(request, "subscribe to presence_event failed");
afb_req_reply(request, NULL, "failed", "Invalid event");
return;
}
afb_req_reply(request, NULL, NULL, NULL);
}
static void unsubscribe(afb_req_t request)
{
if (afb_req_unsubscribe(request, presence_event) < 0) {
AFB_REQ_ERROR(request,
"unsubscribe to presence_event failed");
afb_req_reply(request, NULL, "failed", "Invalid event");
return;
}
afb_req_reply(request, NULL, NULL, NULL);
}
const afb_verb_t binding_verbs[] = {
{ .verb = "subscribe", .callback = subscribe,
.info = "Subscribe to NFC events" },
{ .verb = "unsubscribe", .callback = unsubscribe,
.info = "Unsubscribe to NFC events" },
{ .verb = NULL }
};
/*
* binder API description
*/
const afb_binding_t afbBindingExport = {
.api = "nfc",
.specification = "NFC service API",
.info = "AGL nfc service",
.verbs = binding_verbs,
.preinit = NULL,
.init = init,
.onevent = NULL,
.noconcurrency = 0
};
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