binding: nfc: remove dependencies on libnfc

Bug-AGL: SPEC-1921

 - remove dependencies on libnfc
 - remove unused code (binding/afm-nfc-common.c)

Change-Id: I824094f5d7a409739c479904662e21c900cc8509
Signed-off-by: Raquel Medina <raquel.medina@konsulko.com>

6 files changed, 5 insertions, 184 deletions

diff --git a/README.md b/README.md
index 0a89087..a1d9471 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,8 @@
 
 ## Overview
 
-NFC service uses the respective libnfc package to detect the presence of NFC tags and singal via an event
+NFC service uses neard package to detect the presence of NFC tags and signal clients via an event.
+The NDEF data shall include a text record ('uid') to keep compatibility with the existing agl-service-identity-agent.
 
 ## Verbs
 
@@ -12,17 +13,9 @@ NFC service uses the respective libnfc package to detect the presence of NFC tag
 | unsubscribe        | unsubscribe to NFC events            | *Request:* {"value": "presence"}                                       |
 
 ## Events
-
-### libnfc response
-
-| Name               | Description                          | JSON Response                                                          |
-|--------------------|:-------------------------------------|:-----------------------------------------------------------------------|
-| presence           | event that reports NFC tag presence  |  *Response:* {"status": "detected", "uid": "042eb3628e4981"}           |
-
-
 ### neard response
 
 | Name               | Description                          | JSON Response                                                          |
 |--------------------|:-------------------------------------|:-----------------------------------------------------------------------|
 | presence           | event that reports NFC tag presence  |  *Response:* {"status": "detected",                                    |
-|                    |                                      |      "record": { "Type": "URI", "URI": "http://www.nfc-forum.com" } }  |
+|                    |                                      |      "record": { "Type": "Text", "uid" : "042eb3628e4981"},            |
diff --git a/binding/CMakeLists.txt b/binding/CMakeLists.txt
index 0e6a5bc..512cede 100644
--- a/binding/CMakeLists.txt
+++ b/binding/CMakeLists.txt
@@ -21,7 +21,7 @@
 PROJECT_TARGET_ADD(afm-nfc-binding)
 
 	# Define project Targets
-	add_library(afm-nfc-binding MODULE afm-nfc-common.c afm-nfc-binding.c)
+	add_library(afm-nfc-binding MODULE afm-nfc-binding.c)
 
 	# Binder exposes a unique public entry point
 	SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
diff --git a/binding/afm-nfc-binding.c b/binding/afm-nfc-binding.c
index 70a8625..94705de 100644
--- a/binding/afm-nfc-binding.c
+++ b/binding/afm-nfc-binding.c
@@ -29,133 +29,14 @@
 #include <glib-object.h>
 #include <json-c/json.h>
 #include <neardal/neardal.h>
-#include <nfc/nfc.h>
-#include <nfc/nfc-types.h>
-
 #define AFB_BINDING_VERSION 3
 #include <afb/afb-binding.h>
 
 #include "afm-nfc-common.h"
 
-#define WAIT_FOR_REMOVE(dev) { while (0 == nfc_initiator_target_is_present(dev, NULL)) {} }
-
 static afb_event_t presence_event;
 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 
-static const nfc_modulation modulations[] = {
-	{ .nmt = NMT_ISO14443A, .nbr = NBR_106 },
-};
-
-static char *get_tag_uid(nfc_target *nt)
-{
-	if (nt->nm.nmt == NMT_ISO14443A)
-		return to_hex_string((unsigned char *) &nt->nti.nai.abtUid, nt->nti.nai.szUidLen);
-
-	return NULL;
-}
-
-static void send_detect_event(char *current_id, nfc_binding_data *data)
-{
-	json_object *jresp;
-
-	if (current_id == NULL)
-		return;
-
-	jresp = json_object_new_object();
-
-	json_object_object_add(jresp, "status", json_object_new_string("detected"));
-	json_object_object_add(jresp, "uid", json_object_new_string(current_id));
-
-	if (data->jresp) {
-		json_object_put(data->jresp);
-		data->jresp = NULL;
-	}
-
-	json_object_get(jresp);
-	data->jresp = jresp;
-
-	afb_event_push(presence_event, jresp);
-}
-
-static void *nfc_loop_thread(void *ptr)
-{
-	nfc_binding_data *data = ptr;
-
-	while (1) {
-		nfc_target nt;
-		json_object *jresp;
-		int res = nfc_initiator_poll_target(data->dev, modulations, ARRAY_SIZE(modulations), 0xff, 2, &nt);
-		char *current_uid;
-
-		if (res < 0)
-			break;
-
-		pthread_mutex_lock(&mutex);
-
-		current_uid = get_tag_uid(&nt);
-		send_detect_event(current_uid, data);
-
-		pthread_mutex_unlock(&mutex);
-
-		WAIT_FOR_REMOVE(data->dev);
-
-		pthread_mutex_lock(&mutex);
-
-		jresp = json_object_new_object();
-		json_object_object_add(jresp, "status", json_object_new_string("removed"));
-		json_object_object_add(jresp, "uid", json_object_new_string(current_uid));
-
-		if (data->jresp) {
-			json_object_put(data->jresp);
-			data->jresp = NULL;
-		}
-
-		afb_event_push(presence_event, jresp);
-
-		pthread_mutex_unlock(&mutex);
-	}
-
-	nfc_close(data->dev);
-	nfc_exit(data->ctx);
-	free(data);
-
-	return NULL;
-}
-
-
-static nfc_binding_data *get_libnfc_instance()
-{
-	nfc_context *ctx = NULL;
-	nfc_device *dev = NULL;
-	nfc_binding_data *data;
-
-	nfc_init(&ctx);
-
-	dev = nfc_open(ctx, NULL);
-
-	if (dev == NULL) {
-		AFB_WARNING("Cannot get context for libnfc");
-		nfc_exit(ctx);
-		return NULL;
-	}
-
-	if (nfc_initiator_init(dev) < 0) {
-		AFB_WARNING("Cannot get initiator mode from libnfc");
-		nfc_close(dev);
-		nfc_exit(ctx);
-		return NULL;
-	}
-
-	data = malloc(sizeof(nfc_binding_data));
-
-	if (data) {
-		data->ctx = ctx;
-		data->dev = dev;
-	}
-
-	return data;
-}
-
 static void neard_cb_record_found(const char *tag_name, void *ptr)
 {
 	nfc_binding_data *data = ptr;
@@ -245,18 +126,12 @@ static void *neard_loop_thread(void *ptr)
 static int init(afb_api_t api)
 {
 	pthread_t thread_id;
-	nfc_binding_data *data = get_libnfc_instance();
+	nfc_binding_data *data = NULL;
 	char **adapters = NULL;
 	int num_adapters, ret;
 
 	presence_event = afb_daemon_make_event("presence");
 
-	if (data) {
-		afb_api_set_userdata(api, data);
-
-		return pthread_create(&thread_id, NULL, nfc_loop_thread, data);
-	}
-
 	ret = neardal_get_adapters(&adapters, &num_adapters);
 
 	if (ret == NEARDAL_SUCCESS) {
diff --git a/binding/afm-nfc-common.c b/binding/afm-nfc-common.c
deleted file mode 100644
index 6dee428..0000000
--- a/binding/afm-nfc-common.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * 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.
- *
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include "afm-nfc-common.h"
-
-char *to_hex_string(unsigned char *data, size_t size)
-{
-	char *buffer = malloc((2 * size) + 1);
-	char *tmp = buffer;
-	int i;
-
-	if (buffer == NULL)
-		return buffer;
-
-	for (i = 0; i < size; i++) {
-		tmp += sprintf(tmp, "%.2x", data[i]);
-	}
-
-	return buffer;
-}
diff --git a/binding/afm-nfc-common.h b/binding/afm-nfc-common.h
index c4c4cff..24a879c 100644
--- a/binding/afm-nfc-common.h
+++ b/binding/afm-nfc-common.h
@@ -21,17 +21,8 @@
 
 #include <glib.h>
 #include <json-c/json.h>
-#include <nfc/nfc-types.h>
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
-
-char *to_hex_string(unsigned char *data, size_t size);
-
 
 typedef struct {
-	nfc_context *ctx;
-	nfc_device *dev;
-
 	gchar *adapter;
 	GMainLoop *loop;
 
diff --git a/conf.d/cmake/config.cmake b/conf.d/cmake/config.cmake
index 74c1fee..7cd8fb4 100644
--- a/conf.d/cmake/config.cmake
+++ b/conf.d/cmake/config.cmake
@@ -67,7 +67,6 @@ set (gcc_minimal_version 4.9)
 set (PKG_REQUIRED_LIST
 	json-c
 	glib-2.0
-	libnfc
 	libsystemd>=222
 	neardal
 	afb-daemon